diff --git a/AUTHORS b/AUTHORS
index 3c0898ce..0b4b5f15 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -351,6 +351,10 @@ M. K. Srikant <srix@vsnl.com>
 M. Levinson <levinsm@users.sourceforge.net>
 	Python scripting fixes
 
+M. Vefa Bicakci <bicave@superonline.com>
+	Licenses modifications under "GPL version 2 or any later version."
+	Locale-independent case-insensitive comparisons
+
 Malcolm Parsons <malcolm.parsons@gmail.com>
 	Typo fixes
 
diff --git a/NEWS b/NEWS
index 2a95f44d..3b4b5c57 100644
--- a/NEWS
+++ b/NEWS
@@ -301,6 +301,9 @@ To be released as 0.11.6.
 
 * critical bug 1053: fix crash if a download finishes after ELinks has
   closed the terminal from which the download was started
+* major bug 1004: ignore locales when comparing HTML element names and
+  similar strings, so e.g. ``title'' matches ``TITLE'' even in the
+  Turkish locale
 
 ELinks 0.11.5:
 --------------
diff --git a/src/bookmarks/dialogs.c b/src/bookmarks/dialogs.c
index 2e66a035..cbd901f5 100644
--- a/src/bookmarks/dialogs.c
+++ b/src/bookmarks/dialogs.c
@@ -556,7 +556,7 @@ test_search(struct listbox_item *item, void *data_, int *offset)
 		assert(ctx->title && ctx->url);
 
 		ctx->found = (*ctx->title && strcasestr(bm->title, ctx->title))
-			     || (*ctx->url && strcasestr(bm->url, ctx->url));
+			     || (*ctx->url && c_strcasestr(bm->url, ctx->url));
 
 		if (ctx->found) *offset = 0;
 	}
diff --git a/src/cache/dialogs.c b/src/cache/dialogs.c
index 9d60548f..55da14a6 100644
--- a/src/cache/dialogs.c
+++ b/src/cache/dialogs.c
@@ -193,8 +193,8 @@ match_cache_entry(struct listbox_item *item, struct terminal *term,
 {
 	struct cache_entry *cached = item->udata;
 
-	if (strcasestr(struri(cached->uri), text)
-	    || (cached->head && strcasestr(cached->head, text)))
+	if (c_strcasestr(struri(cached->uri), text)
+	    || (cached->head && c_strcasestr(cached->head, text)))
 		return LISTBOX_MATCH_OK;
 
 	return LISTBOX_MATCH_NO;
diff --git a/src/config/cmdline.c b/src/config/cmdline.c
index 4565b138..b5263235 100644
--- a/src/config/cmdline.c
+++ b/src/config/cmdline.c
@@ -321,7 +321,7 @@ remote_cmd(struct option *o, unsigned char ***argv, int *argc)
 	for (method = 0; remote_methods[method].name; method++) {
 		unsigned char *name = remote_methods[method].name;
 
-		if (!strlcasecmp(command, len, name, -1))
+		if (!c_strlcasecmp(command, len, name, -1))
 			break;
 	}
 
@@ -359,7 +359,7 @@ remote_cmd(struct option *o, unsigned char ***argv, int *argc)
 		if (remote_argc < 1)
 			break;
 
-		if (!strcasecmp(remote_argv[0], "openBrowser")) {
+		if (!c_strcasecmp(remote_argv[0], "openBrowser")) {
 			remote_session_flags = SES_REMOTE_NEW_WINDOW;
 		}
 		break;
@@ -450,7 +450,7 @@ print_full_help_inner(struct option *tree, unsigned char *path,
 		    || (option->flags & OPT_HIDDEN))
 			continue;
 
-		if (!capt && !strncasecmp(option->name, "_template_", 10))
+		if (!capt && !c_strncasecmp(option->name, "_template_", 10))
 			capt = (unsigned char *) N_("Template option folder");
 
 		if (!capt) {
diff --git a/src/config/kbdbind.c b/src/config/kbdbind.c
index ed9f5719..2096a56d 100644
--- a/src/config/kbdbind.c
+++ b/src/config/kbdbind.c
@@ -18,6 +18,7 @@
 #include "main/event.h"
 #include "main/module.h"
 #include "terminal/kbd.h"
+#include "util/conv.h"
 #include "util/memory.h"
 #include "util/string.h"
 
@@ -363,7 +364,7 @@ read_key(const unsigned char *key_str)
 		return key_str[0];
 
 	for (key = key_table; key->str; key++)
-		if (!strcasecmp(key->str, key_str))
+		if (!c_strcasecmp(key->str, key_str))
 			return key->num;
 
 	return KBD_UNDEF;
@@ -380,17 +381,17 @@ parse_keystroke(const unsigned char *s, struct term_event_keyboard *kbd)
 {
 	kbd->modifier = KBD_MOD_NONE;
 	while (1) {
-		if (!strncasecmp(s, "Shift", 5) && (s[5] == '-' || s[5] == '+')) {
+		if (!c_strncasecmp(s, "Shift", 5) && (s[5] == '-' || s[5] == '+')) {
 			/* Shift+a == shiFt-a == Shift-a */
 			kbd->modifier |= KBD_MOD_SHIFT;
 			s += 6;
 
-		} else if (!strncasecmp(s, "Ctrl", 4) && (s[4] == '-' || s[4] == '+')) {
+		} else if (!c_strncasecmp(s, "Ctrl", 4) && (s[4] == '-' || s[4] == '+')) {
 			/* Ctrl+a == ctRl-a == Ctrl-a */
 			kbd->modifier |= KBD_MOD_CTRL;
 			s += 5;
 
-		} else if (!strncasecmp(s, "Alt", 3) && (s[3] == '-' || s[3] == '+')) {
+		} else if (!c_strncasecmp(s, "Alt", 3) && (s[3] == '-' || s[3] == '+')) {
 			/* Alt+a == aLt-a == Alt-a */
 			kbd->modifier |= KBD_MOD_ALT;
 			s += 4;
@@ -430,7 +431,7 @@ parse_keystroke(const unsigned char *s, struct term_event_keyboard *kbd)
 		 * and instead make kbd_ev_lookup() or its callers
 		 * search for different variants of the keystroke if
 		 * the original one is not bound to any action.  */
-		kbd->key = toupper(kbd->key);
+		kbd->key = c_toupper(kbd->key);
 	}
 
 	return (kbd->key == KBD_UNDEF) ? -1 : 0;
diff --git a/src/cookies/cookies.c b/src/cookies/cookies.c
index d7caa25f..0c7059dd 100644
--- a/src/cookies/cookies.c
+++ b/src/cookies/cookies.c
@@ -143,7 +143,7 @@ get_cookie_server(unsigned char *host, int hostlen)
 		/* XXX: We must count with cases like "x.co" vs "x.co.uk"
 		 * below! */
 		int cslen = strlen(cs->host);
-		int cmp = strncasecmp(cs->host, host, hostlen);
+		int cmp = c_strncasecmp(cs->host, host, hostlen);
 
 		if (!sort_spot && (cmp > 0 || (cmp == 0 && cslen > hostlen))) {
 			/* This is the first @cs with name greater than @host,
@@ -234,13 +234,13 @@ is_domain_security_ok(unsigned char *domain, unsigned char *server, int server_l
 
 	/* Match domain and server.. */
 
-	/* XXX: Hmm, can't we use strlcasecmp() here? --pasky */
+	/* XXX: Hmm, can't we use c_strlcasecmp() here? --pasky */
 
 	if (domain_len > server_len) return 0;
 
 	/* Ensure that the domain is atleast a substring of the server before
 	 * continuing. */
-	if (strncasecmp(domain, server + server_len - domain_len, domain_len))
+	if (c_strncasecmp(domain, server + server_len - domain_len, domain_len))
 		return 0;
 
 	/* Allow domains which are same as servers. --<rono@sentuny.com.au> */
@@ -499,8 +499,8 @@ accept_cookie(struct cookie *cookie)
 		struct cookie *c, *next;
 
 		foreachsafe (c, next, cookies) {
-			if (strcasecmp(c->name, cookie->name)
-			    || strcasecmp(c->domain, cookie->domain))
+			if (c_strcasecmp(c->name, cookie->name)
+			    || c_strcasecmp(c->domain, cookie->domain))
 				continue;
 
 			delete_cookie(c);
@@ -513,7 +513,7 @@ accept_cookie(struct cookie *cookie)
 
 	/* XXX: This crunches CPU too. --pasky */
 	foreach (cd, c_domains)
-		if (!strcasecmp(cd->domain, cookie->domain))
+		if (!c_strcasecmp(cd->domain, cookie->domain))
 			return;
 
 	domain_len = strlen(cookie->domain);
@@ -535,11 +535,11 @@ delete_cookie(struct cookie *c)
 	struct cookie *d;
 
 	foreach (d, cookies)
-		if (!strcasecmp(d->domain, c->domain))
+		if (!c_strcasecmp(d->domain, c->domain))
 			goto end;
 
 	foreach (cd, c_domains) {
-	       	if (!strcasecmp(cd->domain, c->domain)) {
+	       	if (!c_strcasecmp(cd->domain, c->domain)) {
 			del_from_list(cd);
 			mem_free(cd);
 			break;
diff --git a/src/document/css/scanner.c b/src/document/css/scanner.c
index 767c6643..fd9057e6 100644
--- a/src/document/css/scanner.c
+++ b/src/document/css/scanner.c
@@ -287,7 +287,7 @@ scan_css_token(struct scanner *scanner, struct scanner_token *token)
 
 	} else if (first_char == '!') {
 		scan_css(scanner, string, CSS_CHAR_WHITESPACE);
-		if (!strncasecmp(string, "important", 9)) {
+		if (!c_strncasecmp(string, "important", 9)) {
 			type = CSS_TOKEN_IMPORTANT;
 			string += 9;
 		}
diff --git a/src/document/css/stylesheet.c b/src/document/css/stylesheet.c
index 7cdd14a6..892f0c5c 100644
--- a/src/document/css/stylesheet.c
+++ b/src/document/css/stylesheet.c
@@ -38,7 +38,7 @@ find_css_selector(struct css_selector_set *sels,
 	foreach_css_selector (selector, sels) {
 		if (type != selector->type || rel != selector->relation)
 			continue;
-		if (strlcasecmp(name, namelen, selector->name, -1))
+		if (c_strlcasecmp(name, namelen, selector->name, -1))
 			continue;
 		return selector;
 	}
diff --git a/src/document/document.c b/src/document/document.c
index c7337d5d..5424f6fb 100644
--- a/src/document/document.c
+++ b/src/document/document.c
@@ -191,7 +191,7 @@ find_tag(struct document *document, unsigned char *name, int namelen)
 	struct tag *tag;
 
 	foreach (tag, document->tags)
-		if (!strlcasecmp(tag->name, -1, name, namelen))
+		if (!c_strlcasecmp(tag->name, -1, name, namelen))
 			return tag->y;
 
 	return -1;
diff --git a/src/document/dom/renderer.c b/src/document/dom/renderer.c
index c20d2a4a..32484dad 100644
--- a/src/document/dom/renderer.c
+++ b/src/document/dom/renderer.c
@@ -54,22 +54,22 @@ done_dom_renderer(struct dom_renderer *renderer)
 static void
 get_doctype(struct dom_renderer *renderer, struct cache_entry *cached)
 {
-	if (!strcasecmp("application/rss+xml", cached->content_type)) {
+	if (!c_strcasecmp("application/rss+xml", cached->content_type)) {
 		renderer->doctype = SGML_DOCTYPE_RSS;
 
-	} else if (!strcasecmp("application/docbook+xml",
-	                       cached->content_type)) {
+	} else if (!c_strcasecmp("application/docbook+xml",
+				 cached->content_type)) {
 		renderer->doctype = SGML_DOCTYPE_DOCBOOK;
 
-	} else if (!strcasecmp("application/xbel+xml", cached->content_type)
-		   || !strcasecmp("application/x-xbel", cached->content_type)
-		   || !strcasecmp("application/xbel", cached->content_type)) {
+	} else if (!c_strcasecmp("application/xbel+xml", cached->content_type)
+		   || !c_strcasecmp("application/x-xbel", cached->content_type)
+		   || !c_strcasecmp("application/xbel", cached->content_type)) {
 		renderer->doctype = SGML_DOCTYPE_XBEL;
 
 	} else {
-		assertm(!strcasecmp("text/html", cached->content_type)
-			|| !strcasecmp("application/xhtml+xml",
-		                       cached->content_type),
+		assertm(!c_strcasecmp("text/html", cached->content_type)
+			|| !c_strcasecmp("application/xhtml+xml",
+					 cached->content_type),
 			"Couldn't resolve doctype '%s'", cached->content_type);
 
 		renderer->doctype = SGML_DOCTYPE_HTML;
diff --git a/src/document/html/frames.c b/src/document/html/frames.c
index a06af548..3c40db7f 100644
--- a/src/document/html/frames.c
+++ b/src/document/html/frames.c
@@ -137,7 +137,7 @@ find_fd(struct session *ses, unsigned char *name,
 
 	foreachback (doc_view, ses->scrn_frames) {
 		if (doc_view->used) continue;
-		if (strcasecmp(doc_view->name, name)) continue;
+		if (c_strcasecmp(doc_view->name, name)) continue;
 
 		doc_view->used = 1;
 		doc_view->depth = depth;
diff --git a/src/document/html/parser.c b/src/document/html/parser.c
index ecafb631..c95e3792 100644
--- a/src/document/html/parser.c
+++ b/src/document/html/parser.c
@@ -94,7 +94,7 @@ get_target(struct document_options *options, unsigned char *a)
 
 	if (!v) return NULL;
 
-	if (!*v || !strcasecmp(v, "_self")) {
+	if (!*v || !c_strcasecmp(v, "_self")) {
 		mem_free_set(&v, stracpy(options->framename));
 	}
 
@@ -341,7 +341,7 @@ search_for_url_param(unsigned char *str, unsigned char **ret)
 	/* Returns now if string @str is empty. */
 	if (!*str) return HEADER_PARAM_NOT_FOUND;
 
-	p = strcasestr(str, "url");
+	p = c_strcasestr(str, "url");
 	if (!p) return HEADER_PARAM_NOT_FOUND;
 	p += 3;
 
@@ -551,7 +551,7 @@ look_for_map(unsigned char **pos, unsigned char *eof, struct uri *uri,
 		return 1;
 	}
 
-	if (strlcasecmp(name, namelen, "MAP", 3)) return 1;
+	if (c_strlcasecmp(name, namelen, "MAP", 3)) return 1;
 
 	if (uri && uri->fragment) {
 		/* FIXME (bug 784): options->cp is the terminal charset;
@@ -559,7 +559,7 @@ look_for_map(unsigned char **pos, unsigned char *eof, struct uri *uri,
 		al = get_attr_val(attr, "name", options->cp);
 		if (!al) return 1;
 
-		if (strlcasecmp(al, -1, uri->fragment, uri->fragmentlen)) {
+		if (c_strlcasecmp(al, -1, uri->fragment, uri->fragmentlen)) {
 			mem_free(al);
 			return 1;
 		}
@@ -606,12 +606,12 @@ look_for_tag(unsigned char **pos, unsigned char *eof,
 
 	if (parse_element(*pos, eof, NULL, NULL, NULL, &pos2)) return 1;
 
-	if (strlcasecmp(name, namelen, "A", 1)
-	    && strlcasecmp(name, namelen, "/A", 2)
-	    && strlcasecmp(name, namelen, "MAP", 3)
-	    && strlcasecmp(name, namelen, "/MAP", 4)
-	    && strlcasecmp(name, namelen, "AREA", 4)
-	    && strlcasecmp(name, namelen, "/AREA", 5)) {
+	if (c_strlcasecmp(name, namelen, "A", 1)
+	    && c_strlcasecmp(name, namelen, "/A", 2)
+	    && c_strlcasecmp(name, namelen, "MAP", 3)
+	    && c_strlcasecmp(name, namelen, "/MAP", 4)
+	    && c_strlcasecmp(name, namelen, "AREA", 4)
+	    && c_strlcasecmp(name, namelen, "/AREA", 5)) {
 		*pos = pos2;
 		return 1;
 	}
@@ -648,12 +648,12 @@ look_for_link(unsigned char **pos, unsigned char *eof, struct menu_item **menu,
 		return 1;
 	}
 
-	if (!strlcasecmp(name, namelen, "A", 1)) {
+	if (!c_strlcasecmp(name, namelen, "A", 1)) {
 		while (look_for_tag(pos, eof, name, namelen, &label));
 
 		if (*pos >= eof) return 0;
 
-	} else if (!strlcasecmp(name, namelen, "AREA", 4)) {
+	} else if (!c_strlcasecmp(name, namelen, "AREA", 4)) {
 		/* FIXME (bug 784): options->cp is the terminal charset;
 		 * should use the document charset instead.  */
 		unsigned char *alt = get_attr_val(attr, "alt", options->cp);
@@ -667,7 +667,7 @@ look_for_link(unsigned char **pos, unsigned char *eof, struct menu_item **menu,
 			label = NULL;
 		}
 
-	} else if (!strlcasecmp(name, namelen, "/MAP", 4)) {
+	} else if (!c_strlcasecmp(name, namelen, "/MAP", 4)) {
 		/* This is the only successful return from here! */
 		add_to_ml(ml, (void *) *menu, (void *) NULL);
 		return 0;
diff --git a/src/document/html/parser/forms.c b/src/document/html/parser/forms.c
index 1a717a8b..c34459a1 100644
--- a/src/document/html/parser/forms.c
+++ b/src/document/html/parser/forms.c
@@ -52,7 +52,7 @@ html_form(struct html_context *html_context, unsigned char *a,
 
 	al = get_attr_val(a, "method", html_context->doc_cp);
 	if (al) {
-		if (!strcasecmp(al, "post")) {
+		if (!c_strcasecmp(al, "post")) {
 			unsigned char *enctype;
 
 			enctype  = get_attr_val(a, "enctype",
@@ -60,9 +60,9 @@ html_form(struct html_context *html_context, unsigned char *a,
 
 			form->method = FORM_METHOD_POST;
 			if (enctype) {
-				if (!strcasecmp(enctype, "multipart/form-data"))
+				if (!c_strcasecmp(enctype, "multipart/form-data"))
 					form->method = FORM_METHOD_POST_MP;
-				else if (!strcasecmp(enctype, "text/plain"))
+				else if (!c_strcasecmp(enctype, "text/plain"))
 					form->method = FORM_METHOD_POST_TEXT_PLAIN;
 				mem_free(enctype);
 			}
@@ -153,11 +153,11 @@ html_button(struct html_context *html_context, unsigned char *a,
 	al = get_attr_val(a, "type", cp);
 	if (!al) goto no_type_attr;
 
-	if (!strcasecmp(al, "button")) {
+	if (!c_strcasecmp(al, "button")) {
 		type = FC_BUTTON;
-	} else if (!strcasecmp(al, "reset")) {
+	} else if (!c_strcasecmp(al, "reset")) {
 		type = FC_RESET;
-	} else if (strcasecmp(al, "submit")) {
+	} else if (c_strcasecmp(al, "submit")) {
 		/* unknown type */
 		mem_free(al);
 		return;
@@ -273,16 +273,16 @@ html_input(struct html_context *html_context, unsigned char *a,
 
 	al = get_attr_val(a, "type", cp);
 	if (al) {
-		if (!strcasecmp(al, "text")) fc->type = FC_TEXT;
-		else if (!strcasecmp(al, "hidden")) fc->type = FC_HIDDEN;
-		else if (!strcasecmp(al, "button")) fc->type = FC_BUTTON;
-		else if (!strcasecmp(al, "checkbox")) fc->type = FC_CHECKBOX;
-		else if (!strcasecmp(al, "radio")) fc->type = FC_RADIO;
-		else if (!strcasecmp(al, "password")) fc->type = FC_PASSWORD;
-		else if (!strcasecmp(al, "submit")) fc->type = FC_SUBMIT;
-		else if (!strcasecmp(al, "reset")) fc->type = FC_RESET;
-		else if (!strcasecmp(al, "file")) fc->type = FC_FILE;
-		else if (!strcasecmp(al, "image")) fc->type = FC_IMAGE;
+		if (!c_strcasecmp(al, "text")) fc->type = FC_TEXT;
+		else if (!c_strcasecmp(al, "hidden")) fc->type = FC_HIDDEN;
+		else if (!c_strcasecmp(al, "button")) fc->type = FC_BUTTON;
+		else if (!c_strcasecmp(al, "checkbox")) fc->type = FC_CHECKBOX;
+		else if (!c_strcasecmp(al, "radio")) fc->type = FC_RADIO;
+		else if (!c_strcasecmp(al, "password")) fc->type = FC_PASSWORD;
+		else if (!c_strcasecmp(al, "submit")) fc->type = FC_SUBMIT;
+		else if (!c_strcasecmp(al, "reset")) fc->type = FC_RESET;
+		else if (!c_strcasecmp(al, "file")) fc->type = FC_FILE;
+		else if (!c_strcasecmp(al, "image")) fc->type = FC_IMAGE;
 		/* else unknown type, let it default to FC_TEXT. */
 		mem_free(al);
 	}
@@ -408,12 +408,12 @@ abort:
 		closing_tag = 0;
 	}
 
-	if (closing_tag && !strlcasecmp(name, namelen, "SELECT", 6)) {
+	if (closing_tag && !c_strlcasecmp(name, namelen, "SELECT", 6)) {
 		add_select_item(&lnk_menu, &lbl, &orig_lbl, values, order, nnmi);
 		goto end_parse;
 	}
 
-	if (!strlcasecmp(name, namelen, "OPTION", 6)) {
+	if (!c_strlcasecmp(name, namelen, "OPTION", 6)) {
 		add_select_item(&lnk_menu, &lbl, &orig_lbl, values, order, nnmi);
 
 		if (!closing_tag) {
@@ -442,7 +442,7 @@ abort:
 		goto see;
 	}
 
-	if (!strlcasecmp(name, namelen, "OPTGROUP", 8)) {
+	if (!c_strlcasecmp(name, namelen, "OPTGROUP", 8)) {
 		add_select_item(&lnk_menu, &lbl, &orig_lbl, values, order, nnmi);
 
 		if (group) new_menu_item(&lnk_menu, NULL, -1, 0), group = 0;
@@ -586,10 +586,10 @@ sp:
 
 		if (namelen < 6) goto se;
 		if (name[0] == '/') name++, namelen--;
-
-		if (strlcasecmp(name, namelen, "OPTION", 6)
-		    && strlcasecmp(name, namelen, "SELECT", 6)
-		    && strlcasecmp(name, namelen, "OPTGROUP", 8))
+		
+		if (c_strlcasecmp(name, namelen, "OPTION", 6)
+		    && c_strlcasecmp(name, namelen, "SELECT", 6)
+		    && c_strlcasecmp(name, namelen, "OPTGROUP", 8))
 			goto se;
 	}
 
@@ -641,7 +641,7 @@ pp:
 		return;
 	}
 	if (parse_element(p, eof, &t_name, &t_namelen, NULL, end)) goto pp;
-	if (strlcasecmp(t_name, t_namelen, "/TEXTAREA", 9)) goto pp;
+	if (c_strlcasecmp(t_name, t_namelen, "/TEXTAREA", 9)) goto pp;
 
 	fc = init_form_control(FC_TEXTAREA, attr, html_context);
 	if (!fc) return;
@@ -684,14 +684,14 @@ pp:
 
 	wrap_attr = get_attr_val(attr, "wrap", html_context->doc_cp);
 	if (wrap_attr) {
-		if (!strcasecmp(wrap_attr, "hard")
-		    || !strcasecmp(wrap_attr, "physical")) {
+		if (!c_strcasecmp(wrap_attr, "hard")
+		    || !c_strcasecmp(wrap_attr, "physical")) {
 			fc->wrap = FORM_WRAP_HARD;
-		} else if (!strcasecmp(wrap_attr, "soft")
-			   || !strcasecmp(wrap_attr, "virtual")) {
+		} else if (!c_strcasecmp(wrap_attr, "soft")
+			   || !c_strcasecmp(wrap_attr, "virtual")) {
 			fc->wrap = FORM_WRAP_SOFT;
-		} else if (!strcasecmp(wrap_attr, "none")
-			   || !strcasecmp(wrap_attr, "off")) {
+		} else if (!c_strcasecmp(wrap_attr, "none")
+			   || !c_strcasecmp(wrap_attr, "off")) {
 			fc->wrap = FORM_WRAP_NONE;
 		}
 		mem_free(wrap_attr);
diff --git a/src/document/html/parser/general.c b/src/document/html/parser/general.c
index d5dfdeb5..bbb64daf 100644
--- a/src/document/html/parser/general.c
+++ b/src/document/html/parser/general.c
@@ -227,10 +227,10 @@ html_script(struct html_context *html_context, unsigned char *a,
 	if (type) {
 		unsigned char *pos = type;
 
-		if (!strncasecmp(type, "text/", 5)) {
+		if (!c_strncasecmp(type, "text/", 5)) {
 			pos += 5;
 
-		} else if (!strncasecmp(type, "application/", 12)) {
+		} else if (!c_strncasecmp(type, "application/", 12)) {
 			pos += 12;
 
 		} else {
@@ -241,7 +241,7 @@ not_processed:
 			return;
 		}
 
-		if (!strncasecmp(pos, "javascript", 10)) {
+		if (!c_strncasecmp(pos, "javascript", 10)) {
 			int len = strlen(pos);
 
 			if (len > 10 && !isdigit(pos[10])) {
@@ -249,11 +249,11 @@ not_processed:
 				goto not_processed;
 			}
 
-		} else if (strcasecmp(pos, "ecmascript")
-		    && strcasecmp(pos, "jscript")
-		    && strcasecmp(pos, "livescript")
-		    && strcasecmp(pos, "x-javascript")
-		    && strcasecmp(pos, "x-ecmascript")) {
+		} else if (c_strcasecmp(pos, "ecmascript")
+		    && c_strcasecmp(pos, "jscript")
+		    && c_strcasecmp(pos, "livescript")
+		    && c_strcasecmp(pos, "x-javascript")
+		    && c_strcasecmp(pos, "x-ecmascript")) {
 			mem_free(type);
 			goto not_processed;
 		}
@@ -271,7 +271,7 @@ not_processed:
 
 		if (languagelen < 10
 		    || (languagelen > 10 && !isdigit(language[10]))
-		    || strncasecmp(language, "javascript", 10)) {
+		    || c_strncasecmp(language, "javascript", 10)) {
 			mem_free(language);
 			goto not_processed;
 		}
@@ -372,7 +372,7 @@ imported:
 		 * argument. */
 		if (parse_element(*end, eof, &name, &namelen, NULL, NULL))
 			continue;
-		if (strlcasecmp(name, namelen, "/script", 7))
+		if (c_strlcasecmp(name, namelen, "/script", 7))
 			continue;
 		/* We have won! */
 		break;
@@ -482,13 +482,13 @@ html_linebrk(struct html_context *html_context, unsigned char *a,
 	unsigned char *al = get_attr_val(a, "align", html_context->doc_cp);
 
 	if (al) {
-		if (!strcasecmp(al, "left")) par_format.align = ALIGN_LEFT;
-		else if (!strcasecmp(al, "right")) par_format.align = ALIGN_RIGHT;
-		else if (!strcasecmp(al, "center")) {
+		if (!c_strcasecmp(al, "left")) par_format.align = ALIGN_LEFT;
+		else if (!c_strcasecmp(al, "right")) par_format.align = ALIGN_RIGHT;
+		else if (!c_strcasecmp(al, "center")) {
 			par_format.align = ALIGN_CENTER;
 			if (!html_context->table_level)
 				par_format.leftmargin = par_format.rightmargin = 0;
-		} else if (!strcasecmp(al, "justify")) par_format.align = ALIGN_JUSTIFY;
+		} else if (!c_strcasecmp(al, "justify")) par_format.align = ALIGN_JUSTIFY;
 		mem_free(al);
 	}
 }
@@ -745,9 +745,9 @@ html_ul(struct html_context *html_context, unsigned char *a,
 
 	al = get_attr_val(a, "type", html_context->doc_cp);
 	if (al) {
-		if (!strcasecmp(al, "disc") || !strcasecmp(al, "circle"))
+		if (!c_strcasecmp(al, "disc") || !c_strcasecmp(al, "circle"))
 			par_format.flags = P_O;
-		else if (!strcasecmp(al, "square"))
+		else if (!c_strcasecmp(al, "square"))
 			par_format.flags = P_PLUS;
 		mem_free(al);
 	}
@@ -893,7 +893,7 @@ html_li(struct html_context *html_context, unsigned char *a,
 			if (t == P_ROMAN) {
 				unsigned char *x;
 
-				for (x = n; *x; x++) *x = toupper(*x);
+				for (x = n; *x; x++) *x = c_toupper(*x);
 			}
 
 		} else {
diff --git a/src/document/html/parser/link.c b/src/document/html/parser/link.c
index bfbe1b22..d203037e 100644
--- a/src/document/html/parser/link.c
+++ b/src/document/html/parser/link.c
@@ -463,12 +463,12 @@ html_object(struct html_context *html_context, unsigned char *a,
 	type = get_attr_val(a, "type", html_context->doc_cp);
 	if (!type) { mem_free(url); return; }
 
-	if (!strncasecmp(type, "text/", 5)) {
+	if (!c_strncasecmp(type, "text/", 5)) {
 		/* We will just emulate <iframe>. */
 		html_iframe_do(a, url, html_context);
 		html_skip(html_context, a);
 
-	} else if (!strncasecmp(type, "image/", 6)) {
+	} else if (!c_strncasecmp(type, "image/", 6)) {
 		/* <img> emulation. */
 		/* TODO: Use the enclosed text as 'alt' attribute. */
 		html_img_do(a, url, html_context);
@@ -519,7 +519,7 @@ html_embed(struct html_context *html_context, unsigned char *a,
 	if (!extension) extension = object_src;
 
 	type = get_extension_content_type(extension);
-	if (type && !strncasecmp(type, "image/", 6)) {
+	if (type && !c_strncasecmp(type, "image/", 6)) {
 		html_img_do(a, object_src, html_context);
 	} else {
 		/* We will just emulate <iframe>. */
@@ -757,26 +757,26 @@ html_link_parse(struct html_context *html_context, unsigned char *a,
 
 	/* TODO: fastfind */
 	for (i = 0; lt_names[i].str; i++)
-		if (!strcasecmp(link->name, lt_names[i].str)) {
+		if (!c_strcasecmp(link->name, lt_names[i].str)) {
 			link->type = lt_names[i].type;
 			return 1;
 		}
 
-	if (strcasestr(link->name, "icon") ||
-	   (link->content_type && strcasestr(link->content_type, "icon"))) {
+	if (c_strcasestr(link->name, "icon") ||
+	   (link->content_type && c_strcasestr(link->content_type, "icon"))) {
 		link->type = LT_ICON;
 
-	} else if (strcasestr(link->name, "alternate")) {
+	} else if (c_strcasestr(link->name, "alternate")) {
 		link->type = LT_ALTERNATE;
 		if (link->lang)
 			link->type = LT_ALTERNATE_LANG;
-		else if (strcasestr(link->name, "stylesheet") ||
-			 (link->content_type && strcasestr(link->content_type, "css")))
+		else if (c_strcasestr(link->name, "stylesheet") ||
+			 (link->content_type && c_strcasestr(link->content_type, "css")))
 			link->type = LT_ALTERNATE_STYLESHEET;
 		else if (link->media)
 			link->type = LT_ALTERNATE_MEDIA;
 
-	} else if (link->content_type && strcasestr(link->content_type, "css")) {
+	} else if (link->content_type && c_strcasestr(link->content_type, "css")) {
 		link->type = LT_STYLESHEET;
 	}
 
@@ -858,7 +858,7 @@ html_link(struct html_context *html_context, unsigned char *a,
 
 	if (link.lang && link.type == LT_ALTERNATE_LANG &&
 	    (link_display < 3 || (link.hreflang &&
-				  strcasecmp(link.hreflang, link.lang)))) {
+				  c_strcasecmp(link.hreflang, link.lang)))) {
 		APPEND(link.lang);
 	}
 
diff --git a/src/document/html/parser/parse.c b/src/document/html/parser/parse.c
index 74707b14..128485eb 100644
--- a/src/document/html/parser/parse.c
+++ b/src/document/html/parser/parse.c
@@ -153,7 +153,7 @@ next_attr:
 	n = name;
 	name_start = e;
 
-	while (atchr(*n) && atchr(*e) && toupper(*e) == toupper(*n)) e++, n++;
+	while (atchr(*n) && atchr(*e) && c_toupper(*e) == c_toupper(*n)) e++, n++;
 	found = !*n && !atchr(*e);
 
 	if (found && (flags & HTML_ATTR_TEST)) return name_start;
@@ -506,8 +506,8 @@ static struct element_info elements[] = {
 static int
 compar(const void *a, const void *b)
 {
-	return strcasecmp(((struct element_info *) a)->name,
-			  ((struct element_info *) b)->name);
+	return c_strcasecmp(((struct element_info *) a)->name,
+			    ((struct element_info *) b)->name);
 }
 
 #else
@@ -550,7 +550,7 @@ void
 init_tags_lookup(void)
 {
 #ifdef USE_FASTFIND
-	fastfind_index(&ff_tags_index, FF_COMPRESS);
+	fastfind_index(&ff_tags_index, FF_COMPRESS | FF_LOCALE_INDEP);
 #endif
 }
 
@@ -907,11 +907,11 @@ start_element(struct element_info *ei,
 			foreach (e, html_context->stack) {
 				if (is_block_element(e) && is_inline_element(ei)) break;
 				if (e->type < ELEMENT_KILLABLE) break;
-				if (!strlcasecmp(e->name, e->namelen, name, namelen)) break;
+				if (!c_strlcasecmp(e->name, e->namelen, name, namelen)) break;
 			}
 		}
 
-		if (!strlcasecmp(e->name, e->namelen, name, namelen)) {
+		if (!c_strlcasecmp(e->name, e->namelen, name, namelen)) {
 			while (e->prev != (void *) &html_context->stack)
 				kill_html_stack_item(html_context, e->prev);
 
@@ -1084,7 +1084,7 @@ end_element(struct element_info *ei,
 	 * quotation).  "she said." will be rendered normally.  */
 	foreach (e, html_context->stack) {
 		if (is_block_element(e) && is_inline_element(ei)) kill = 1;
-		if (strlcasecmp(e->name, e->namelen, name, namelen)) {
+		if (c_strlcasecmp(e->name, e->namelen, name, namelen)) {
 			if (e->type < ELEMENT_KILLABLE)
 				break;
 			else
@@ -1183,10 +1183,10 @@ sp:
 	if (parse_element(s, eof, &name, &namelen, &attr, &s)) goto sp;
 
 ps:
-	if (!strlcasecmp(name, namelen, "HEAD", 4)) goto se;
-	if (!strlcasecmp(name, namelen, "/HEAD", 5)) return;
-	if (!strlcasecmp(name, namelen, "BODY", 4)) return;
-	if (title && !title->length && !strlcasecmp(name, namelen, "TITLE", 5)) {
+	if (!c_strlcasecmp(name, namelen, "HEAD", 4)) goto se;
+	if (!c_strlcasecmp(name, namelen, "/HEAD", 5)) return;
+	if (!c_strlcasecmp(name, namelen, "BODY", 4)) return;
+	if (title && !title->length && !c_strlcasecmp(name, namelen, "TITLE", 5)) {
 		unsigned char *s1;
 
 xse:
@@ -1209,7 +1209,7 @@ xsp:
 		clr_spaces(title->source);
 		goto ps;
 	}
-	if (strlcasecmp(name, namelen, "META", 4)) goto se;
+	if (c_strlcasecmp(name, namelen, "META", 4)) goto se;
 
 	/* FIXME (bug 784): options->cp is the terminal charset;
 	 * should use the document charset instead.  */
diff --git a/src/document/html/parser/stack.c b/src/document/html/parser/stack.c
index d5c43b78..6d63abfe 100644
--- a/src/document/html/parser/stack.c
+++ b/src/document/html/parser/stack.c
@@ -62,7 +62,7 @@ search_html_stack(struct html_context *html_context, unsigned char *name)
 	foreach (element, html_context->stack) {
 		if (element == html_top)
 			continue; /* skip the top element */
-		if (strlcasecmp(element->name, element->namelen, name, namelen))
+		if (c_strlcasecmp(element->name, element->namelen, name, namelen))
 			continue;
 		return element;
 	}
@@ -218,7 +218,7 @@ kill_html_stack_until(struct html_context *html_context, int ls, ...)
 				continue;
 			}
 
-			if (strlcasecmp(e->name, e->namelen, s, slen))
+			if (c_strlcasecmp(e->name, e->namelen, s, slen))
 				continue;
 
 			if (!sk) {
@@ -240,11 +240,11 @@ kill_html_stack_until(struct html_context *html_context, int ls, ...)
 		va_end(arg);
 
 		if (e->type < ELEMENT_KILLABLE
-		    || (!strlcasecmp(e->name, e->namelen, "TABLE", 5)))
+		    || (!c_strlcasecmp(e->name, e->namelen, "TABLE", 5)))
 			break;
 
-		if (e->namelen == 2 && toupper(e->name[0]) == 'T') {
-			unsigned char c = toupper(e->name[1]);
+		if (e->namelen == 2 && c_toupper(e->name[0]) == 'T') {
+			unsigned char c = c_toupper(e->name[1]);
 
 			if (c == 'D' || c == 'H' || c == 'R')
 				break;
diff --git a/src/document/html/parser/table.c b/src/document/html/parser/table.c
index 2be0916b..05f82222 100644
--- a/src/document/html/parser/table.c
+++ b/src/document/html/parser/table.c
@@ -89,11 +89,11 @@ get_align(struct html_context *html_context, unsigned char *attr, int *a)
 
 	if (!al) return;
 
-	if (!strcasecmp(al, "left")) *a = ALIGN_LEFT;
-	else if (!strcasecmp(al, "right")) *a = ALIGN_RIGHT;
-	else if (!strcasecmp(al, "center")) *a = ALIGN_CENTER;
-	else if (!strcasecmp(al, "justify")) *a = ALIGN_JUSTIFY;
-	else if (!strcasecmp(al, "char")) *a = ALIGN_RIGHT; /* NOT IMPLEMENTED */
+	if (!c_strcasecmp(al, "left")) *a = ALIGN_LEFT;
+	else if (!c_strcasecmp(al, "right")) *a = ALIGN_RIGHT;
+	else if (!c_strcasecmp(al, "center")) *a = ALIGN_CENTER;
+	else if (!c_strcasecmp(al, "justify")) *a = ALIGN_JUSTIFY;
+	else if (!c_strcasecmp(al, "char")) *a = ALIGN_RIGHT; /* NOT IMPLEMENTED */
 	mem_free(al);
 }
 
@@ -104,10 +104,10 @@ get_valign(struct html_context *html_context, unsigned char *attr, int *a)
 
 	if (!al) return;
 
-	if (!strcasecmp(al, "top")) *a = VALIGN_TOP;
-	else if (!strcasecmp(al, "middle")) *a = VALIGN_MIDDLE;
-	else if (!strcasecmp(al, "bottom")) *a = VALIGN_BOTTOM;
-	else if (!strcasecmp(al, "baseline")) *a = VALIGN_BASELINE; /* NOT IMPLEMENTED */
+	if (!c_strcasecmp(al, "top")) *a = VALIGN_TOP;
+	else if (!c_strcasecmp(al, "middle")) *a = VALIGN_MIDDLE;
+	else if (!c_strcasecmp(al, "bottom")) *a = VALIGN_BOTTOM;
+	else if (!c_strcasecmp(al, "baseline")) *a = VALIGN_BASELINE; /* NOT IMPLEMENTED */
 	mem_free(al);
 }
 
@@ -154,16 +154,16 @@ set_table_frame(struct html_context *html_context, struct table *table,
 	al = get_attr_val(attr, "frame", html_context->doc_cp);
 	if (!al) return;
 
-	if (!strcasecmp(al, "void")) table->frame = TABLE_FRAME_VOID;
-	else if (!strcasecmp(al, "above")) table->frame = TABLE_FRAME_ABOVE;
-	else if (!strcasecmp(al, "below")) table->frame = TABLE_FRAME_BELOW;
-	else if (!strcasecmp(al, "hsides")) table->frame = TABLE_FRAME_HSIDES;
-	else if (!strcasecmp(al, "vsides")) table->frame = TABLE_FRAME_VSIDES;
-	else if (!strcasecmp(al, "lhs")) table->frame = TABLE_FRAME_LHS;
-	else if (!strcasecmp(al, "rhs")) table->frame = TABLE_FRAME_RHS;
+	if (!c_strcasecmp(al, "void")) table->frame = TABLE_FRAME_VOID;
+	else if (!c_strcasecmp(al, "above")) table->frame = TABLE_FRAME_ABOVE;
+	else if (!c_strcasecmp(al, "below")) table->frame = TABLE_FRAME_BELOW;
+	else if (!c_strcasecmp(al, "hsides")) table->frame = TABLE_FRAME_HSIDES;
+	else if (!c_strcasecmp(al, "vsides")) table->frame = TABLE_FRAME_VSIDES;
+	else if (!c_strcasecmp(al, "lhs")) table->frame = TABLE_FRAME_LHS;
+	else if (!c_strcasecmp(al, "rhs")) table->frame = TABLE_FRAME_RHS;
 	/* Following tests are useless since TABLE_FRAME_BOX is the default.
-	 * else if (!strcasecmp(al, "box")) table->frame = TABLE_FRAME_BOX;
-	 * else if (!strcasecmp(al, "border")) table->frame = TABLE_FRAME_BOX;
+	 * else if (!c_strcasecmp(al, "box")) table->frame = TABLE_FRAME_BOX;
+	 * else if (!c_strcasecmp(al, "border")) table->frame = TABLE_FRAME_BOX;
 	 */
 	mem_free(al);
 }
@@ -179,11 +179,11 @@ set_table_rules(struct html_context *html_context, struct table *table,
 	al = get_attr_val(attr, "rules", html_context->doc_cp);
 	if (!al) return;
 
-	if (!strcasecmp(al, "none")) table->rules = TABLE_RULE_NONE;
-	else if (!strcasecmp(al, "groups")) table->rules = TABLE_RULE_GROUPS;
-	else if (!strcasecmp(al, "rows")) table->rules = TABLE_RULE_ROWS;
-	else if (!strcasecmp(al, "cols")) table->rules = TABLE_RULE_COLS;
-	else if (!strcasecmp(al, "all")) table->rules = TABLE_RULE_ALL;
+	if (!c_strcasecmp(al, "none")) table->rules = TABLE_RULE_NONE;
+	else if (!c_strcasecmp(al, "groups")) table->rules = TABLE_RULE_GROUPS;
+	else if (!c_strcasecmp(al, "rows")) table->rules = TABLE_RULE_ROWS;
+	else if (!c_strcasecmp(al, "cols")) table->rules = TABLE_RULE_COLS;
+	else if (!c_strcasecmp(al, "all")) table->rules = TABLE_RULE_ALL;
 	mem_free(al);
 }
 
@@ -527,7 +527,7 @@ skip_table(unsigned char *html, unsigned char *eof)
 		}
 
 
-		if (!strlcasecmp(name, namelen, "TABLE", 5)) {
+		if (!c_strlcasecmp(name, namelen, "TABLE", 5)) {
 			if (!closing_tag) {
 				level++;
 			} else {
@@ -608,7 +608,7 @@ see:
 		closing_tag = 0;
 	}
 
-	if (!strlcasecmp(name, namelen, "TABLE", 5)) {
+	if (!c_strlcasecmp(name, namelen, "TABLE", 5)) {
 		if (!closing_tag) {
 			en = skip_table(en, eof);
 			goto see;
@@ -623,7 +623,7 @@ see:
 		}
 	}
 
-	if (!strlcasecmp(name, namelen, "CAPTION", 7)) {
+	if (!c_strlcasecmp(name, namelen, "CAPTION", 7)) {
 		if (!closing_tag) {
 			add_table_bad_html_end(table, html);
 			if (!table->caption.start)
@@ -637,7 +637,7 @@ see:
 		goto see;
 	}
 
-	if (!strlcasecmp(name, namelen, "COLGROUP", 8)) {
+	if (!c_strlcasecmp(name, namelen, "COLGROUP", 8)) {
 		if (c_span) new_columns(table, c_span, c_width, c_al, c_val, 1);
 
 		add_table_bad_html_end(table, html);
@@ -663,7 +663,7 @@ see:
 		goto see;
 	}
 
-	if (!closing_tag && !strlcasecmp(name, namelen, "COL", 3)) {
+	if (!closing_tag && !c_strlcasecmp(name, namelen, "COL", 3)) {
 		int sp, width, al, val;
 
 		add_table_bad_html_end(table, html);
@@ -684,12 +684,12 @@ see:
 	}
 
 	/* All following tags have T as first letter. */
-	if (toupper(name[0]) != 'T') goto see;
+	if (c_toupper(name[0]) != 'T') goto see;
 
 	name++; namelen--;
 	if (namelen == 0) goto see;
 
-	c = toupper(name[0]);
+	c = c_toupper(name[0]);
 
 	/* /TR /TD /TH */
 	if (closing_tag && namelen == 1) {
@@ -712,9 +712,9 @@ see:
 
 	/* THEAD TBODY TFOOT */
 	if (namelen == 4
-	    && ((!strlcasecmp(name, namelen, "HEAD", 4)) ||
-		(!strlcasecmp(name, namelen, "BODY", 4)) ||
-		(!strlcasecmp(name, namelen, "FOOT", 4)))) {
+	    && ((!c_strlcasecmp(name, namelen, "HEAD", 4)) ||
+		(!c_strlcasecmp(name, namelen, "BODY", 4)) ||
+		(!c_strlcasecmp(name, namelen, "FOOT", 4)))) {
 		if (c_span) new_columns(table, c_span, c_width, c_al, c_val, 1);
 
 		add_table_bad_html_end(table, html);
diff --git a/src/document/html/renderer.c b/src/document/html/renderer.c
index c414e79d..ec6c3125 100644
--- a/src/document/html/renderer.c
+++ b/src/document/html/renderer.c
@@ -1389,7 +1389,7 @@ new_link(struct html_context *html_context, unsigned char *name, int namelen)
 	if (!format.form) {
 		link->target = null_or_stracpy(format.target);
 		link->data.name = memacpy(name, namelen);
-		/* if (strlen(url) > 4 && !strncasecmp(url, "MAP@", 4)) { */
+		/* if (strlen(url) > 4 && !c_strncasecmp(url, "MAP@", 4)) { */
 		if (format.link
 		    && ((format.link[0]|32) == 'm')
 		    && ((format.link[1]|32) == 'a')
diff --git a/src/document/options.c b/src/document/options.c
index 7aef8423..4fdfd4a1 100644
--- a/src/document/options.c
+++ b/src/document/options.c
@@ -96,7 +96,7 @@ int
 compare_opt(struct document_options *o1, struct document_options *o2)
 {
 	return memcmp(o1, o2, offsetof(struct document_options, framename))
-		|| strcasecmp(o1->framename, o2->framename)
+		|| c_strcasecmp(o1->framename, o2->framename)
 		|| (o1->box.x != o2->box.x)
 		|| (o1->box.y != o2->box.y)
 		|| ((o1->needs_height || o2->needs_height)
diff --git a/src/document/renderer.c b/src/document/renderer.c
index d1daa42f..b62719a4 100644
--- a/src/document/renderer.c
+++ b/src/document/renderer.c
@@ -244,13 +244,13 @@ render_encoded_document(struct cache_entry *cached, struct document *document)
 	if (document->options.plain) {
 #ifdef CONFIG_DOM
 		if (cached->content_type
-		    && (!strcasecmp("text/html", cached->content_type)
-			|| !strcasecmp("application/xhtml+xml", cached->content_type)
-		        || !strcasecmp("application/docbook+xml", cached->content_type)
-		        || !strcasecmp("application/rss+xml", cached->content_type)
-		        || !strcasecmp("application/xbel+xml", cached->content_type)
-		        || !strcasecmp("application/x-xbel", cached->content_type)
-		        || !strcasecmp("application/xbel", cached->content_type)))
+		    && (!c_strcasecmp("text/html", cached->content_type)
+			|| !c_strcasecmp("application/xhtml+xml", cached->content_type)
+		        || !c_strcasecmp("application/docbook+xml", cached->content_type)
+		        || !c_strcasecmp("application/rss+xml", cached->content_type)
+		        || !c_strcasecmp("application/xbel+xml", cached->content_type)
+		        || !c_strcasecmp("application/x-xbel", cached->content_type)
+		        || !c_strcasecmp("application/xbel", cached->content_type)))
 			render_dom_document(cached, document, &buffer);
 		else
 #endif
@@ -259,7 +259,7 @@ render_encoded_document(struct cache_entry *cached, struct document *document)
 	} else {
 #ifdef CONFIG_DOM
 		if (cached->content_type
-		    && (!strlcasecmp("application/rss+xml", 19, cached->content_type, -1)))
+		    && (!c_strlcasecmp("application/rss+xml", 19, cached->content_type, -1)))
 			render_dom_document(cached, document, &buffer);
 		else
 #endif
diff --git a/src/dom/css/scanner.c b/src/dom/css/scanner.c
index a0e46e79..7c73273d 100644
--- a/src/dom/css/scanner.c
+++ b/src/dom/css/scanner.c
@@ -290,7 +290,7 @@ scan_css_token(struct dom_scanner *scanner, struct dom_scanner_token *token)
 
 	} else if (first_char == '!') {
 		scan_css(scanner, string, CSS_CHAR_WHITESPACE);
-		if (!strncasecmp(string, "important", 9)) {
+		if (!c_strncasecmp(string, "important", 9)) {
 			type = CSS_TOKEN_IMPORTANT;
 			string += 9;
 		}
diff --git a/src/dom/scanner.h b/src/dom/scanner.h
index 1f6a6f17..2357cf87 100644
--- a/src/dom/scanner.h
+++ b/src/dom/scanner.h
@@ -35,7 +35,7 @@ struct dom_scanner_token {
 /** Compare the token string to a "static" string */
 #define dom_scanner_token_contains(token, str) \
 	((token)->string.length == (sizeof(str) - 1) \
-	 && !strncasecmp((token)->string.string, str, sizeof(str) - 1))
+	 && !c_strncasecmp((token)->string.string, str, sizeof(str) - 1))
 
 
 struct dom_scan_table_info {
diff --git a/src/dom/string.h b/src/dom/string.h
index 830d7701..f6032538 100644
--- a/src/dom/string.h
+++ b/src/dom/string.h
@@ -1,6 +1,7 @@
 #ifndef EL_DOM_STRING_H
 #define EL_DOM_STRING_H
 
+#include "util/conv.h"
 #include "util/memory.h"
 
 /* For now DOM has it's own little string library. Mostly because there are
@@ -31,9 +32,9 @@ static inline int
 dom_string_casecmp(const struct dom_string *string1, const struct dom_string *string2)
 {
 	size_t length = int_min(string1->length, string2->length);
-	size_t string_diff = strncasecmp(string1->string, string2->string, length);
+	size_t string_diff = c_strncasecmp(string1->string, string2->string, length);
 
-	/* If the lengths or strings don't match strncasecmp() does the
+	/* If the lengths or strings don't match c_strncasecmp() does the
 	 * job else return which ever is bigger. */
 	return string_diff ? string_diff : string1->length - string2->length;
 }
@@ -41,7 +42,7 @@ dom_string_casecmp(const struct dom_string *string1, const struct dom_string *st
 static inline int
 dom_string_ncasecmp(struct dom_string *string1, struct dom_string *string2, size_t length)
 {
-	return strncasecmp(string1->string, string2->string, length);
+	return c_strncasecmp(string1->string, string2->string, length);
 }
 
 #define copy_dom_string(string1, string2) \
diff --git a/src/ecmascript/see/document.c b/src/ecmascript/see/document.c
index b5a72d8a..3509126a 100644
--- a/src/ecmascript/see/document.c
+++ b/src/ecmascript/see/document.c
@@ -153,7 +153,7 @@ document_get(struct SEE_interpreter *interp, struct SEE_object *o,
 		if (!string) return;
 
 		foreach (form, document->forms) {
-			if (!form->name || strcasecmp(string, form->name))
+			if (!form->name || c_strcasecmp(string, form->name))
 				continue;
 			form_view = find_form_view(doc_view, form);
 			form_object = js_get_form_object(interp, doc, form_view);
diff --git a/src/ecmascript/see/form.c b/src/ecmascript/see/form.c
index 40f3e1ae..0724e115 100644
--- a/src/ecmascript/see/form.c
+++ b/src/ecmascript/see/form.c
@@ -689,7 +689,7 @@ js_form_elems_namedItem(struct SEE_interpreter *interp, struct SEE_object *self,
 		return;
 
 	foreach (fc, form->items) {
-		if ((fc->id && !strcasecmp(string, fc->id)) || (fc->name && !strcasecmp(string, fc->name))) {
+		if ((fc->id && !c_strcasecmp(string, fc->id)) || (fc->name && !c_strcasecmp(string, fc->name))) {
 			struct form_state *fs = find_form_state(doc_view, fc);
 
 			if (fs) {
@@ -815,7 +815,7 @@ js_forms_namedItem(struct SEE_interpreter *interp, struct SEE_object *self,
 	if (!string)
 		return;
 	foreach (form, document->forms) {
-		if (form->name && !strcasecmp(string, form->name)) {
+		if (form->name && !c_strcasecmp(string, form->name)) {
 			struct form_view *fv = find_form_view(doc_view, form);
 			struct js_form *obj = js_get_form_object(interp,
 			 doc, fv);
@@ -952,7 +952,7 @@ form_get(struct SEE_interpreter *interp, struct SEE_object *o,
 			struct js_input *fcobj = NULL;
 			struct form_state *fs;
 
-			if ((!fc->id || strcasecmp(string, fc->id)) && (!fc->name || strcasecmp(string, fc->name)))
+			if ((!fc->id || c_strcasecmp(string, fc->id)) && (!fc->name || c_strcasecmp(string, fc->name)))
 				continue;
 			fs = find_form_state(doc_view, fc);
 			if (fs) {
@@ -989,19 +989,19 @@ form_put(struct SEE_interpreter *interp, struct SEE_object *o,
 			mem_free_set(&form->action, string);
 		}
 	} else if (p == s_encoding) {
-		if (!strcasecmp(string, "application/x-www-form-urlencoded")) {
+		if (!c_strcasecmp(string, "application/x-www-form-urlencoded")) {
 			form->method = form->method == FORM_METHOD_GET ? FORM_METHOD_GET
 			                                               : FORM_METHOD_POST;
-		} else if (!strcasecmp(string, "multipart/form-data")) {
+		} else if (!c_strcasecmp(string, "multipart/form-data")) {
 			form->method = FORM_METHOD_POST_MP;
-		} else if (!strcasecmp(string, "text/plain")) {
+		} else if (!c_strcasecmp(string, "text/plain")) {
 			form->method = FORM_METHOD_POST_TEXT_PLAIN;
 		}
 		mem_free(string);
 	} else if (p == s_method) {
-		if (!strcasecmp(string, "GET")) {
+		if (!c_strcasecmp(string, "GET")) {
 			form->method = FORM_METHOD_GET;
-		} else if (!strcasecmp(string, "POST")) {
+		} else if (!c_strcasecmp(string, "POST")) {
 			form->method = FORM_METHOD_POST;
 		}
 		mem_free(string);
diff --git a/src/ecmascript/see/window.c b/src/ecmascript/see/window.c
index 32b97708..859d0417 100644
--- a/src/ecmascript/see/window.c
+++ b/src/ecmascript/see/window.c
@@ -304,7 +304,7 @@ js_window_open(struct SEE_interpreter *interp, struct SEE_object *self,
 		return;
 	}
 
-	if (frame && *frame && strcasecmp(frame, "_blank")) {
+	if (frame && *frame && c_strcasecmp(frame, "_blank")) {
 		struct delayed_open *deo = mem_calloc(1, sizeof(*deo));
 
 		if (deo) {
diff --git a/src/ecmascript/spidermonkey/document.c b/src/ecmascript/spidermonkey/document.c
index ef754b27..0f0d7a5a 100644
--- a/src/ecmascript/spidermonkey/document.c
+++ b/src/ecmascript/spidermonkey/document.c
@@ -126,7 +126,7 @@ document_get_property(JSContext *ctx, JSObject *obj, jsval id, jsval *vp)
 		}
 #endif
 		foreach (form, document->forms) {
-			if (!form->name || strcasecmp(string, form->name))
+			if (!form->name || c_strcasecmp(string, form->name))
 				continue;
 
 			object_to_jsval(ctx, vp, get_form_object(ctx, obj, find_form_view(doc_view, form)));
diff --git a/src/ecmascript/spidermonkey/form.c b/src/ecmascript/spidermonkey/form.c
index 49d26440..ff436a17 100644
--- a/src/ecmascript/spidermonkey/form.c
+++ b/src/ecmascript/spidermonkey/form.c
@@ -857,7 +857,8 @@ form_elements_namedItem(JSContext *ctx, JSObject *obj, uintN argc, jsval *argv,
 	undef_to_jsval(ctx, rval);
 
 	foreach (fc, form->items) {
-		if ((fc->id && !strcasecmp(string, fc->id)) || (fc->name && !strcasecmp(string, fc->name))) {
+		if ((fc->id && !c_strcasecmp(string, fc->id))
+		    || (fc->name && !c_strcasecmp(string, fc->name))) {
 			struct form_state *fs = find_form_state(doc_view, fc);
 
 			if (fs) {
@@ -979,7 +980,8 @@ form_get_property(JSContext *ctx, JSObject *obj, jsval id, jsval *vp)
 			JSObject *fcobj = NULL;
 			struct form_state *fs;
 
-			if ((!fc->id || strcasecmp(string, fc->id)) && (!fc->name || strcasecmp(string, fc->name)))
+			if ((!fc->id || c_strcasecmp(string, fc->id))
+			    && (!fc->name || c_strcasecmp(string, fc->name)))
 				continue;
 
 			undef_to_jsval(ctx, vp);
@@ -1120,21 +1122,21 @@ form_set_property(JSContext *ctx, JSObject *obj, jsval id, jsval *vp)
 
 	case JSP_FORM_ENCODING:
 		string = jsval_to_string(ctx, vp);
-		if (!strcasecmp(string, "application/x-www-form-urlencoded")) {
+		if (!c_strcasecmp(string, "application/x-www-form-urlencoded")) {
 			form->method = form->method == FORM_METHOD_GET ? FORM_METHOD_GET
 			                                               : FORM_METHOD_POST;
-		} else if (!strcasecmp(string, "multipart/form-data")) {
+		} else if (!c_strcasecmp(string, "multipart/form-data")) {
 			form->method = FORM_METHOD_POST_MP;
-		} else if (!strcasecmp(string, "text/plain")) {
+		} else if (!c_strcasecmp(string, "text/plain")) {
 			form->method = FORM_METHOD_POST_TEXT_PLAIN;
 		}
 		break;
 
 	case JSP_FORM_METHOD:
 		string = jsval_to_string(ctx, vp);
-		if (!strcasecmp(string, "GET")) {
+		if (!c_strcasecmp(string, "GET")) {
 			form->method = FORM_METHOD_GET;
-		} else if (!strcasecmp(string, "POST")) {
+		} else if (!c_strcasecmp(string, "POST")) {
 			form->method = FORM_METHOD_POST;
 		}
 		break;
@@ -1353,7 +1355,7 @@ find_form_by_name(JSContext *ctx, JSObject *jsdoc,
 		return;
 
 	foreach (form, doc_view->document->forms) {
-		if (form->name && !strcasecmp(string, form->name)) {
+		if (form->name && !c_strcasecmp(string, form->name)) {
 			object_to_jsval(ctx, rval, get_form_object(ctx, jsdoc,
 					find_form_view(doc_view, form)));
 			break;
diff --git a/src/ecmascript/spidermonkey/window.c b/src/ecmascript/spidermonkey/window.c
index 996b5d9d..e1d8c6ae 100644
--- a/src/ecmascript/spidermonkey/window.c
+++ b/src/ecmascript/spidermonkey/window.c
@@ -399,7 +399,7 @@ window_open(JSContext *ctx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
 		return JS_TRUE;
 	}
 
-	if (frame && *frame && strcasecmp(frame, "_blank")) {
+	if (frame && *frame && c_strcasecmp(frame, "_blank")) {
 		struct delayed_open *deo = mem_calloc(1, sizeof(*deo));
 
 		if (deo) {
diff --git a/src/globhist/globhist.c b/src/globhist/globhist.c
index 7f1d7b2b..eef21d06 100644
--- a/src/globhist/globhist.c
+++ b/src/globhist/globhist.c
@@ -318,7 +318,7 @@ globhist_simple_search(unsigned char *search_url, unsigned char *search_title)
 		if ((*search_title
 		     && strcasestr(history_item->title, search_title))
 		    || (*search_url
-			&& strcasestr(history_item->url, search_url))) {
+			&& c_strcasestr(history_item->url, search_url))) {
 			history_item->box_item->visible = 1;
 		} else {
 			history_item->box_item->visible = 0;
diff --git a/src/intl/charsets.c b/src/intl/charsets.c
index de853b98..4170ec3e 100644
--- a/src/intl/charsets.c
+++ b/src/intl/charsets.c
@@ -1376,7 +1376,7 @@ get_cp_index(const unsigned char *name)
 	int i, a;
 	int syscp = 0;
 
-	if (!strcasecmp(name, "System")) {
+	if (!c_strcasecmp(name, "System")) {
 #if HAVE_LANGINFO_CODESET
 		name = nl_langinfo(CODESET);
 		syscp = SYSTEM_CHARSET_FLAG;
@@ -1399,7 +1399,7 @@ get_cp_index(const unsigned char *name)
 			 * once. So we will do a simple strcasecmp() here.
 			 */
 
-			if (!strcasecmp(name, codepages[i].aliases[a]))
+			if (!c_strcasecmp(name, codepages[i].aliases[a]))
 				return i | syscp;
 		}
 	}
@@ -1457,7 +1457,7 @@ get_cp_index(const unsigned char *name)
 	const struct codepage_desc *codepage;
 	int syscp = 0;
 
-	if (!strcasecmp(name, "System")) {
+	if (!c_strcasecmp(name, "System")) {
 #if HAVE_LANGINFO_CODESET
 		name = nl_langinfo(CODESET);
 		syscp = SYSTEM_CHARSET_FLAG;
diff --git a/src/intl/gettext/l10nflist.c b/src/intl/gettext/l10nflist.c
index 8e00b44b..4d12aa95 100644
--- a/src/intl/gettext/l10nflist.c
+++ b/src/intl/gettext/l10nflist.c
@@ -35,6 +35,7 @@
 #include "elinks.h"
 
 #include "intl/gettext/loadinfo.h"
+#include "util/conv.h"
 #include "util/string.h"
 
 /* Awful hack to permit compilation under cygwin and its broken configure.
@@ -349,7 +350,7 @@ _nl_normalize_codeset(const unsigned char *codeset, size_t name_len)
 
 		for (cnt = 0; cnt < name_len; ++cnt)
 			if (isalpha(codeset[cnt]))
-				*wp++ = tolower(codeset[cnt]);
+				*wp++ = c_tolower(codeset[cnt]);
 			else if (isdigit(codeset[cnt]))
 				*wp++ = codeset[cnt];
 
diff --git a/src/intl/gettext/libintl.c b/src/intl/gettext/libintl.c
index a6ee396b..cde480d4 100644
--- a/src/intl/gettext/libintl.c
+++ b/src/intl/gettext/libintl.c
@@ -152,7 +152,7 @@ name_to_language(const unsigned char *name)
 	int i;
 
 	for (i = 0; languages[i].name; i++) {
-		if (strcasecmp(languages[i].name, name))
+		if (c_strcasecmp(languages[i].name, name))
 			continue;
 		return i;
 	}
diff --git a/src/intl/gettext/localealias.c b/src/intl/gettext/localealias.c
index c7aae5b1..c8fe2279 100644
--- a/src/intl/gettext/localealias.c
+++ b/src/intl/gettext/localealias.c
@@ -285,5 +285,5 @@ extend_alias_table(void)
 static int
 alias_compare(const struct alias_map *map1, const struct alias_map *map2)
 {
-	return strcasecmp(map1->alias, map2->alias);
+	return c_strcasecmp(map1->alias, map2->alias);
 }
diff --git a/src/mime/backend/mailcap.c b/src/mime/backend/mailcap.c
index 158b6969..7243934e 100644
--- a/src/mime/backend/mailcap.c
+++ b/src/mime/backend/mailcap.c
@@ -280,13 +280,13 @@ parse_optional_fields(struct mailcap_entry *entry, unsigned char *line)
 
 		if (!field) break;
 
-		if (!strncasecmp(field, "needsterminal", 13)) {
+		if (!c_strncasecmp(field, "needsterminal", 13)) {
 			entry->needsterminal = 1;
 
-		} else if (!strncasecmp(field, "copiousoutput", 13)) {
+		} else if (!c_strncasecmp(field, "copiousoutput", 13)) {
 			entry->copiousoutput = 1;
 
-		} else if (!strncasecmp(field, "test", 4)) {
+		} else if (!c_strncasecmp(field, "test", 4)) {
 			entry->testcommand = get_mailcap_field_text(field + 4);
 			if (!entry->testcommand)
 				return 0;
@@ -298,7 +298,7 @@ parse_optional_fields(struct mailcap_entry *entry, unsigned char *line)
 					return 0;
 				}
 
-		} else if (!strncasecmp(field, "description", 11)) {
+		} else if (!c_strncasecmp(field, "description", 11)) {
 			entry->description = get_mailcap_field_text(field + 11);
 			if (!entry->description)
 				return 0;
diff --git a/src/mime/mime.c b/src/mime/mime.c
index 81d64820..c323290f 100644
--- a/src/mime/mime.c
+++ b/src/mime/mime.c
@@ -249,7 +249,7 @@ get_fragment_content_type(struct cache_entry *cached)
 	if (!sample)
 		return NULL;
 
-	if (strcasestr(sample, "<html>"))
+	if (c_strcasestr(sample, "<html>"))
 		ctype = stracpy("text/html");
 
 	mem_free(sample);
@@ -291,7 +291,7 @@ get_content_type(struct cache_entry *cached)
 		 * is with default (via option system) and mimetypes resolving
 		 * doing that option and hash lookup will not be easy to
 		 * convert. --jonas */
-		convert_to_lowercase(extension, strlen(extension));
+		convert_to_lowercase_locale_indep(extension, strlen(extension));
 
 		ctype = get_extension_content_type(extension);
 		mem_free(extension);
diff --git a/src/network/dns.c b/src/network/dns.c
index 51d79cc6..f409dda7 100644
--- a/src/network/dns.c
+++ b/src/network/dns.c
@@ -89,7 +89,7 @@ find_in_dns_cache(unsigned char *name)
 	struct dnsentry *dnsentry;
 
 	foreach (dnsentry, dns_cache)
-		if (!strcasecmp(dnsentry->name, name)) {
+		if (!c_strcasecmp(dnsentry->name, name)) {
 			move_to_top_of_list(dns_cache, dnsentry);
 			return dnsentry;
 		}
diff --git a/src/osdep/beos/beos.c b/src/osdep/beos/beos.c
index 79edef6a..1011013f 100644
--- a/src/osdep/beos/beos.c
+++ b/src/osdep/beos/beos.c
@@ -41,7 +41,7 @@ get_system_env(void)
 	int env = get_common_env();
 	unsigned char *term = getenv("TERM");
 
-	if (!term || (toupper(term[0]) == 'B' && toupper(term[1]) == 'E'))
+	if (!term || (c_toupper(term[0]) == 'B' && c_toupper(term[1]) == 'E'))
 		env |= ENV_BE;
 
 	return env;
diff --git a/src/protocol/ftp/ftp.c b/src/protocol/ftp/ftp.c
index 3616b563..8670fabe 100644
--- a/src/protocol/ftp/ftp.c
+++ b/src/protocol/ftp/ftp.c
@@ -297,7 +297,7 @@ auth_user_matching_uri(struct auth_entry *auth, struct uri *uri)
 {
 	if (!uri->userlen) /* Noone said it doesn't. */
 		return 1;
-	return !strlcasecmp(auth->user, -1, uri->user, uri->userlen);
+	return !c_strlcasecmp(auth->user, -1, uri->user, uri->userlen);
 }
 
 
@@ -907,7 +907,7 @@ next:
 	if (pos + 4 > data_len)
 		return -1;
 
-	if (strncasecmp(&data[pos], "byte", 4))
+	if (c_strncasecmp(&data[pos], "byte", 4))
 		return -1;
 
 	errno = 0;
diff --git a/src/protocol/gopher/gopher.c b/src/protocol/gopher/gopher.c
index f8c8b80d..f755d255 100644
--- a/src/protocol/gopher/gopher.c
+++ b/src/protocol/gopher/gopher.c
@@ -224,7 +224,7 @@ add_gopher_command(struct connection *conn, struct string *command,
 		querylen = selector + selectorlen - query;
 		/* Exclude '?' */
 		selectorlen -= querylen + 1;
-		if (querylen >= 7 && !strncasecmp(query, "search=", 7)) {
+		if (querylen >= 7 && !c_strncasecmp(query, "search=", 7)) {
 			query	 += 7;
 			querylen -= 7;
 		}
diff --git a/src/protocol/header.c b/src/protocol/header.c
index ae5272a2..80c47c0f 100644
--- a/src/protocol/header.c
+++ b/src/protocol/header.c
@@ -133,7 +133,7 @@ parse_header(unsigned char *head, unsigned char *item, unsigned char **ptr)
 
 		/* Does item match header line ? */
 		for (itempos = item; *itempos && *pos; itempos++, pos++)
-			if (toupper(*itempos) != toupper(*pos))
+			if (c_toupper(*itempos) != c_toupper(*pos))
 				break;
 
 		if (!*pos) break; /* Nothing left to parse. */
@@ -226,7 +226,7 @@ parse_header_param(unsigned char *str, unsigned char *name, unsigned char **ret)
 
 		while (*p && (*p == ';' || *p <= ' ')) p++;
 		if (strlen(p) < namelen) return HEADER_PARAM_NOT_FOUND;
-	} while (strncasecmp(p, name, namelen));
+	} while (c_strncasecmp(p, name, namelen));
 
 	p += namelen;
 
@@ -275,11 +275,11 @@ get_header_param(unsigned char *e, unsigned char *name)
 	unsigned char *n, *start;
 
 again:
-	while (*e && toupper(*e++) != toupper(*name));
+	while (*e && c_toupper(*e++) != c_toupper(*name));
 	if (!*e) return NULL;
 
 	n = name + 1;
-	while (*n && toupper(*e) == toupper(*n)) e++, n++;
+	while (*n && c_toupper(*e) == c_toupper(*n)) e++, n++;
 	if (*n) goto again;
 
 	skip_space(e);
diff --git a/src/protocol/http/blacklist.c b/src/protocol/http/blacklist.c
index 8f92d9ea..2b9e7ea4 100644
--- a/src/protocol/http/blacklist.c
+++ b/src/protocol/http/blacklist.c
@@ -34,7 +34,7 @@ get_blacklist_entry(struct uri *uri)
 	if_assert_failed return NULL;
 
 	foreach (entry, blacklist)
-		if (!strlcasecmp(entry->host, -1, uri->host, uri->hostlen))
+		if (!c_strlcasecmp(entry->host, -1, uri->host, uri->hostlen))
 			return entry;
 
 	return NULL;
diff --git a/src/protocol/http/http.c b/src/protocol/http/http.c
index d7ca3274..1e9d7502 100644
--- a/src/protocol/http/http.c
+++ b/src/protocol/http/http.c
@@ -385,8 +385,8 @@ get_http_code(struct read_buffer *rb, int *code, struct http_version *version)
 	while (*head == ' ') head++;
 
 	/* HTTP/ */
-	if (toupper(*head) != 'H' || toupper(*++head) != 'T' ||
-	    toupper(*++head) != 'T' || toupper(*++head) != 'P'
+	if (c_toupper(*head) != 'H' || c_toupper(*++head) != 'T' ||
+	    c_toupper(*++head) != 'T' || c_toupper(*++head) != 'P'
 	    || *++head != '/')
 		return -1;
 
@@ -1409,7 +1409,7 @@ get_header(struct read_buffer *rb)
 	/* XXX: We will have to do some guess about whether an HTTP header is
 	 * coming or not, in order to support HTTP/0.9 reply correctly. This
 	 * means a little code duplication with get_http_code(). --pasky */
-	if (rb->length > 4 && strncasecmp(rb->data, "HTTP/", 5))
+	if (rb->length > 4 && c_strncasecmp(rb->data, "HTTP/", 5))
 		return -2;
 
 	for (i = 0; i < rb->length; i++) {
@@ -1446,7 +1446,7 @@ check_http_authentication(struct connection *conn, struct uri *uri,
 
 	d = parse_header(header, header_field, &str);
 	while (d) {
-		if (!strncasecmp(d, "Basic", 5)) {
+		if (!c_strncasecmp(d, "Basic", 5)) {
 			unsigned char *realm = get_header_param(d, "realm");
 
 			if (realm) {
@@ -1455,7 +1455,7 @@ check_http_authentication(struct connection *conn, struct uri *uri,
 				mem_free(d);
 				break;
 			}
-		} else if (!strncasecmp(d, "Digest", 6)) {
+		} else if (!c_strncasecmp(d, "Digest", 6)) {
 			unsigned char *realm = get_header_param(d, "realm");
 			unsigned char *nonce = get_header_param(d, "nonce");
 			unsigned char *opaque = get_header_param(d, "opaque");
@@ -1469,13 +1469,13 @@ check_http_authentication(struct connection *conn, struct uri *uri,
 			break;
 		}
 #ifdef CONFIG_GSSAPI
-		else if (!strncasecmp(d, HTTPNEG_GSS_STR, HTTPNEG_GSS_STRLEN)) {
+		else if (!c_strncasecmp(d, HTTPNEG_GSS_STR, HTTPNEG_GSS_STRLEN)) {
 			if (http_negotiate_input(conn, uri, HTTPNEG_GSS, str)==0)
 				ret = 1;
 			mem_free(d);
 			break;
 		}
-		else if (!strncasecmp(d, HTTPNEG_NEG_STR, HTTPNEG_NEG_STRLEN)) {
+		else if (!c_strncasecmp(d, HTTPNEG_NEG_STR, HTTPNEG_NEG_STRLEN)) {
 			if (http_negotiate_input(conn, uri, HTTPNEG_NEG, str)==0)
 				ret = 1;
 			mem_free(d);
@@ -1730,7 +1730,7 @@ again:
 
 		d = parse_header(conn->cached->head, "Proxy-Authenticate", &str);
 		while (d) {
-			if (!strncasecmp(d, "Basic", 5)) {
+			if (!c_strncasecmp(d, "Basic", 5)) {
 				unsigned char *realm = get_header_param(d, "realm");
 
 				if (realm) {
@@ -1740,7 +1740,7 @@ again:
 					break;
 				}
 
-			} else if (!strncasecmp(d, "Digest", 6)) {
+			} else if (!c_strncasecmp(d, "Digest", 6)) {
 				unsigned char *realm = get_header_param(d, "realm");
 				unsigned char *nonce = get_header_param(d, "nonce");
 				unsigned char *opaque = get_header_param(d, "opaque");
@@ -1766,7 +1766,7 @@ again:
 
 	if ((d = parse_header(conn->cached->head, "Connection", NULL))
 	     || (d = parse_header(conn->cached->head, "Proxy-Connection", NULL))) {
-		if (!strcasecmp(d, "close")) http->close = 1;
+		if (!c_strcasecmp(d, "close")) http->close = 1;
 		mem_free(d);
 	} else if (PRE_HTTP_1_1(version)) {
 		http->close = 1;
@@ -1778,7 +1778,7 @@ again:
 	if (d) {
 		if (strlen(d) > 6) {
 			d[5] = 0;
-			if (isdigit(d[6]) && !strcasecmp(d, "bytes")) {
+			if (isdigit(d[6]) && !c_strcasecmp(d, "bytes")) {
 				int f;
 
 				errno = 0;
@@ -1834,7 +1834,7 @@ again:
 		d = parse_header(conn->cached->head, "Accept-Ranges", NULL);
 
 		if (d) {
-			if (!strcasecmp(d, "none"))
+			if (!c_strcasecmp(d, "none"))
 				conn->unrestartable = 1;
 			mem_free(d);
 		} else {
@@ -1845,7 +1845,7 @@ again:
 
 	d = parse_header(conn->cached->head, "Transfer-Encoding", NULL);
 	if (d) {
-		if (!strcasecmp(d, "chunked")) {
+		if (!c_strcasecmp(d, "chunked")) {
 			http->length = LEN_CHUNKED;
 			http->chunk_remaining = CHUNK_SIZE;
 		}
@@ -1855,7 +1855,7 @@ again:
 
 	d = parse_header(conn->cached->head, "Last-Modified", NULL);
 	if (d) {
-		if (conn->cached->last_modified && strcasecmp(conn->cached->last_modified, d)) {
+		if (conn->cached->last_modified && c_strcasecmp(conn->cached->last_modified, d)) {
 			delete_entry_content(conn->cached);
 			if (conn->from) {
 				conn->from = 0;
@@ -1917,21 +1917,21 @@ again:
 		 * will leave the saved file with the correct encoding. */
 #ifdef CONFIG_GZIP
 		if (file_encoding != ENCODING_GZIP
-		    && (!strcasecmp(d, "gzip") || !strcasecmp(d, "x-gzip")))
+		    && (!c_strcasecmp(d, "gzip") || !c_strcasecmp(d, "x-gzip")))
 		    	conn->content_encoding = ENCODING_GZIP;
-		if (!strcasecmp(d, "deflate") || !strcasecmp(d, "x-deflate"))
+		if (!c_strcasecmp(d, "deflate") || !c_strcasecmp(d, "x-deflate"))
 			conn->content_encoding = ENCODING_DEFLATE;
 #endif
 
 #ifdef CONFIG_BZIP2
 		if (file_encoding != ENCODING_BZIP2
-		    && (!strcasecmp(d, "bzip2") || !strcasecmp(d, "x-bzip2")))
+		    && (!c_strcasecmp(d, "bzip2") || !c_strcasecmp(d, "x-bzip2")))
 			conn->content_encoding = ENCODING_BZIP2;
 #endif
 
 #ifdef CONFIG_LZMA
 		if (file_encoding != ENCODING_LZMA
-		    && (!strcasecmp(d, "lzma") || !strcasecmp(d, "x-lzma")))
+		    && (!c_strcasecmp(d, "lzma") || !c_strcasecmp(d, "x-lzma")))
 			conn->content_encoding = ENCODING_LZMA;
 #endif
 		mem_free(d);
diff --git a/src/protocol/nntp/response.c b/src/protocol/nntp/response.c
index bf461ccc..21327106 100644
--- a/src/protocol/nntp/response.c
+++ b/src/protocol/nntp/response.c
@@ -297,9 +297,9 @@ add_header_to_string(struct string *str, unsigned char *header)
 			break;
 
 		for (sp = end; sp < cp; sp++)
-			charset_q[sp - end] = tolower(*sp);
+			charset_q[sp - end] = c_tolower(*sp);
 		charset_q[cp - end] = 0;
-		encoding = tolower(cp[1]);
+		encoding = c_tolower(cp[1]);
 
 		if (!encoding || cp[2] != '?')
 			break;
diff --git a/src/protocol/protocol.c b/src/protocol/protocol.c
index e43adc2e..4452b552 100644
--- a/src/protocol/protocol.c
+++ b/src/protocol/protocol.c
@@ -114,7 +114,7 @@ get_protocol(unsigned char *name, int namelen)
 		unsigned char *pname = protocol_backends[protocol].name;
 		int pnamelen = strlen(pname);
 		int minlen = int_min(pnamelen, namelen);
-		int compare = strncasecmp(pname, name, minlen);
+		int compare = c_strncasecmp(pname, name, minlen);
 
 		if (compare == 0) {
 			if (pnamelen == namelen)
diff --git a/src/protocol/proxy.c b/src/protocol/proxy.c
index b3fa1c71..3f8195c5 100644
--- a/src/protocol/proxy.c
+++ b/src/protocol/proxy.c
@@ -37,7 +37,7 @@ proxy_probe_no_proxy(unsigned char *url, unsigned char *no_proxy)
 		skip_space(no_proxy);
 		if (jumper) *jumper = '\0';
 
-		if (strcasestr(url, no_proxy)) {
+		if (c_strcasestr(url, no_proxy)) {
 			if (jumper) *jumper = ',';
 			if (slash) *slash = '/';
 			return 1;
@@ -86,9 +86,9 @@ strip_proxy_protocol(unsigned char *proxy,
 {
 	assert(proxy && *proxy);
 
-	if (!strncasecmp(proxy, strip1, strlen(strip1)))
+	if (!c_strncasecmp(proxy, strip1, strlen(strip1)))
 		proxy += strlen(strip1);
-	else if (strip2 && !strncasecmp(proxy, strip2, strlen(strip2)))
+	else if (strip2 && !c_strncasecmp(proxy, strip2, strlen(strip2)))
 		proxy += strlen(strip2);
 
 	return proxy;
diff --git a/src/protocol/uri.c b/src/protocol/uri.c
index 04cd519e..5e23ea27 100644
--- a/src/protocol/uri.c
+++ b/src/protocol/uri.c
@@ -67,13 +67,13 @@ is_in_domain(unsigned char *domain, unsigned char *server, int server_len)
 		return 0;
 
 	if (domain_len == server_len)
-		return !strncasecmp(domain, server, server_len);
+		return !c_strncasecmp(domain, server, server_len);
 
 	len = server_len - domain_len;
 	if (server[len - 1] != '.')
 		return 0;
 
-	return !strncasecmp(domain, server + len, domain_len);
+	return !c_strncasecmp(domain, server + len, domain_len);
 }
 
 int
@@ -131,7 +131,7 @@ end_with_known_tld(const unsigned char *s, int slen)
 		int tldlen = strlen(tld[i]);
 		int pos = slen - tldlen;
 
-		if (pos >= 0 && !strncasecmp(&s[pos], tld[i], tldlen))
+		if (pos >= 0 && !c_strncasecmp(&s[pos], tld[i], tldlen))
 			return pos;
 	}
 
@@ -274,7 +274,7 @@ parse_uri(struct uri *uri, unsigned char *uristring)
 
 		/* A bit of a special case, but using the "normal" host
 		 * parsing seems a bit scary at this point. (see bug 107). */
-		if (datalen > 9 && !strncasecmp(prefix_end, "localhost/", 10)) {
+		if (datalen > 9 && !c_strncasecmp(prefix_end, "localhost/", 10)) {
 			prefix_end += 9;
 			datalen -= 9;
 		}
@@ -711,8 +711,8 @@ normalize_uri(struct uri *uri, unsigned char *uristring)
 		 * get_translated_uri() through translate_url() calls this
 		 * function and then it already works on and modifies an
 		 * allocated copy. */
-		convert_to_lowercase(uri->string, uri->protocollen);
-		if (uri->hostlen) convert_to_lowercase(uri->host, uri->hostlen);
+		convert_to_lowercase_locale_indep(uri->string, uri->protocollen);
+		if (uri->hostlen) convert_to_lowercase_locale_indep(uri->host, uri->hostlen);
 
 		parse = 1;
 		parse_string = uri->data;
@@ -1023,7 +1023,7 @@ find_uri_protocol(unsigned char *newurl)
 	ch = newurl + strcspn(newurl, ".:/@");
 	if (*ch == '@'
 	    || (*ch == ':' && *newurl != '[' && strchr(newurl, '@'))
-	    || !strncasecmp(newurl, "ftp.", 4)) {
+	    || !c_strncasecmp(newurl, "ftp.", 4)) {
 		/* Contains user/password/ftp-hostname */
 		return PROTOCOL_FTP;
 
@@ -1521,11 +1521,11 @@ check_uri_sanity(struct uri *uri)
 	int pos;
 
 	for (pos = 0; pos < uri->protocollen; pos++)
-		if (isupper(uri->string[pos])) goto error;
+		if (c_isupper(uri->string[pos])) goto error;
 
 	if (uri->hostlen)
 		for (pos = 0; pos < uri->hostlen; pos++)
-			if (isupper(uri->host[pos])) goto error;
+			if (c_isupper(uri->host[pos])) goto error;
 	return;
 error:
 	INTERNAL("Uppercase letters detected in protocol or host part (%s).", struri(uri));
diff --git a/src/protocol/user.c b/src/protocol/user.c
index f0bcc5db..8efc79cb 100644
--- a/src/protocol/user.c
+++ b/src/protocol/user.c
@@ -104,7 +104,7 @@ get_user_program(struct terminal *term, unsigned char *progid, int progidlen)
 
 	/* Now add lowercased progid part. Delicious. */
 	add_bytes_to_string(&name, progid, progidlen);
-	convert_to_lowercase(&name.source[sizeof("protocol.user.") - 1], progidlen);
+	convert_to_lowercase_locale_indep(&name.source[sizeof("protocol.user.") - 1], progidlen);
 
 	add_char_to_string(&name, '.');
 	add_to_string(&name, get_system_str(xwin));
diff --git a/src/session/download.c b/src/session/download.c
index 2929831f..27390bb4 100644
--- a/src/session/download.c
+++ b/src/session/download.c
@@ -1316,7 +1316,7 @@ setup_download_handler(struct session *ses, struct download *loading,
 		goto plaintext_follow;
 
 	for (i = 0; known_types[i].type; i++) {
-		if (strcasecmp(ctype, known_types[i].type))
+		if (c_strcasecmp(ctype, known_types[i].type))
 			continue;
 
 		plaintext = known_types[i].plain;
@@ -1326,7 +1326,7 @@ setup_download_handler(struct session *ses, struct download *loading,
 	xwin = ses->tab->term->environment & ENV_XWIN;
 	handler = get_mime_type_handler(ctype, xwin);
 
-	if (!handler && strlen(ctype) >= 4 && !strncasecmp(ctype, "text", 4))
+	if (!handler && strlen(ctype) >= 4 && !c_strncasecmp(ctype, "text", 4))
 		goto plaintext_follow;
 
 	type_query = find_type_query(ses);
@@ -1339,8 +1339,8 @@ setup_download_handler(struct session *ses, struct download *loading,
 #ifdef CONFIG_BITTORRENT
 			/* A terrible waste of a good MIME handler here, but we want
 			 * to use the type_query this is easier. */
-			if ((!strcasecmp(ctype, "application/x-bittorrent")
-				|| !strcasecmp(ctype, "application/x-torrent"))
+			if ((!c_strcasecmp(ctype, "application/x-bittorrent")
+				|| !c_strcasecmp(ctype, "application/x-torrent"))
 			    && !get_cmd_opt_bool("anonymous"))
 				query_bittorrent_dialog(type_query);
 			else
diff --git a/src/session/session.c b/src/session/session.c
index f59fbaae..f40e7bee 100644
--- a/src/session/session.c
+++ b/src/session/session.c
@@ -341,7 +341,7 @@ request_frame(struct session *ses, unsigned char *name,
 	foreach (frame, loc->frames) {
 		struct document_view *doc_view;
 
-		if (strcasecmp(frame->name, name))
+		if (c_strcasecmp(frame->name, name))
 			continue;
 
 		foreach (doc_view, ses->scrn_frames) {
@@ -1255,7 +1255,7 @@ ses_find_frame(struct session *ses, unsigned char *name)
 	if_assert_failed return NULL;
 
 	foreachback (frame, loc->frames)
-		if (!strcasecmp(frame->name, name))
+		if (!c_strcasecmp(frame->name, name))
 			return frame;
 
 	return NULL;
diff --git a/src/util/color.c b/src/util/color.c
index d6684ebb..ef440b3b 100644
--- a/src/util/color.c
+++ b/src/util/color.c
@@ -69,7 +69,7 @@ void
 init_colors_lookup(void)
 {
 #ifdef USE_FASTFIND
-	fastfind_index(&ff_colors_index, FF_COMPRESS);
+	fastfind_index(&ff_colors_index, FF_COMPRESS | FF_LOCALE_INDEP);
 #endif
 }
 
@@ -112,7 +112,7 @@ decode_hex_color:
 
 #ifndef USE_FASTFIND
 		for (cs = color_specs; cs->name; cs++)
-			if (!strlcasecmp(cs->name, -1, str, slen))
+			if (!c_strlcasecmp(cs->name, -1, str, slen))
 				break;
 #else
 		cs = fastfind_search(&ff_colors_index, str, slen);
diff --git a/src/util/conv.c b/src/util/conv.c
index e35ecdce..7ca0dc63 100644
--- a/src/util/conv.c
+++ b/src/util/conv.c
@@ -411,7 +411,7 @@ strtolx(unsigned char *str, unsigned char **end)
 	if (errno) return 0;
 	if (!*end) return num;
 
-	postfix = toupper(**end);
+	postfix = c_toupper(**end);
 	if (postfix == 'K') {
 		(*end)++;
 		if (num < -INT_MAX / 1024) return -INT_MAX;
@@ -534,3 +534,99 @@ sanitize_url(unsigned char *url)
 	return 1;
 }
 
+
+int c_tolower(int c) {
+	switch (c)
+	{
+		case 'A': return 'a';
+		case 'B': return 'b';
+		case 'C': return 'c';
+		case 'D': return 'd';
+		case 'E': return 'e';
+		case 'F': return 'f';
+		case 'G': return 'g';
+		case 'H': return 'h';
+		case 'I': return 'i';
+		case 'J': return 'j';
+		case 'K': return 'k';
+		case 'L': return 'l';
+		case 'M': return 'm';
+		case 'N': return 'n';
+		case 'O': return 'o';
+		case 'P': return 'p';
+		case 'Q': return 'q';
+		case 'R': return 'r';
+		case 'S': return 's';
+		case 'T': return 't';
+		case 'U': return 'u';
+		case 'V': return 'v';
+		case 'W': return 'w';
+		case 'X': return 'x';
+		case 'Y': return 'y';
+		case 'Z': return 'z';
+		default: return c;
+	}
+}
+
+int c_toupper(int c) {
+	switch (c) {
+		case 'a': return 'A';
+		case 'b': return 'B';
+		case 'c': return 'C';
+		case 'd': return 'D';
+		case 'e': return 'E';
+		case 'f': return 'F';
+		case 'g': return 'G';
+		case 'h': return 'H';
+		case 'i': return 'I';
+		case 'j': return 'J';
+		case 'k': return 'K';
+		case 'l': return 'L';
+		case 'm': return 'M';
+		case 'n': return 'N';
+		case 'o': return 'O';
+		case 'p': return 'P';
+		case 'q': return 'Q';
+		case 'r': return 'R';
+		case 's': return 'S';
+		case 't': return 'T';
+		case 'u': return 'U';
+		case 'v': return 'V';
+		case 'w': return 'W';
+		case 'x': return 'X';
+		case 'y': return 'Y';
+		case 'z': return 'Z';
+		default: return c;
+	}
+}
+
+int c_isupper (int c)
+{
+	switch (c)
+	{
+		case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
+		case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
+		case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
+		case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
+		case 'Y': case 'Z':
+			return 1;
+		default:
+			return 0;
+	}
+}
+
+int c_islower (int c)
+{
+	switch (c)
+	{
+		case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
+		case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
+		case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
+		case 's': case 't': case 'u': case 'v': case 'w': case 'x':
+		case 'y': case 'z':
+			return 1;
+		default:
+			return 0;
+	}
+}
+
diff --git a/src/util/conv.h b/src/util/conv.h
index 605388bb..b364f198 100644
--- a/src/util/conv.h
+++ b/src/util/conv.h
@@ -182,6 +182,16 @@ trim_chars(unsigned char *s, unsigned char c, int *len)
 	return s;
 }
 
+/* Convert a character to {lower|upper}case using the
+ * ASCII character set (as if in the C locale) */
+int c_tolower(int c);
+int c_toupper(int c);
+
+/* Check whether a character is {lower|upper}case using the
+ * the ASCII character set (as if in the C locale) */
+int c_islower(int c);
+int c_isupper(int c);
+
 /** Convert uppercase letters in @a string with the given @a length to
  * lowercase. */
 static inline void
@@ -192,6 +202,16 @@ convert_to_lowercase(unsigned char *string, int length)
 			string[length] = tolower(string[length]);
 }
 
+/* Convert uppercase letters in @string with the given @length to lowercase
+ * using the ASCII character set (as if in the C locale) */
+static inline void
+convert_to_lowercase_locale_indep(unsigned char *string, int length)
+{
+	for (length--; length >= 0; length--)
+		if (c_isupper(string[length]))
+			string[length] = c_tolower(string[length]);
+}
+
 /** This function drops control chars, nbsp char and limit the number
  * of consecutive space chars to one. It modifies its argument. */
 void clr_spaces(unsigned char *str);
diff --git a/src/util/fastfind.c b/src/util/fastfind.c
index 17ac97ed..a55b6d91 100644
--- a/src/util/fastfind.c
+++ b/src/util/fastfind.c
@@ -169,6 +169,7 @@ struct fastfind_info {
 	int leafsets_count;
 
 	unsigned int case_aware:1;
+	unsigned int locale_indep:1;
 	unsigned int compress:1;
 
 	int idxtab[FF_MAX_CHARS];
@@ -233,6 +234,7 @@ FF_DBG_dump_stats(struct fastfind_info *info)
 	fprintf(stderr, "------ FastFind Statistics ------\n");
 	fprintf(stderr, "Comment     : %s\n", info->debug.comment);
 	fprintf(stderr, "Case-aware  : %s\n", info->case_aware ? "yes" : "no");
+	fprintf(stderr, "Locale-indep: %s\n", info->locale_indep ? "yes" : "no");
 	fprintf(stderr, "Compress    : %s\n", info->compress ? "yes" : "no");
 	fprintf(stderr, "Uniq_chars  : %s\n", info->uniq_chars);
 	fprintf(stderr, "Uniq_chars #: %d/%d max.\n", info->uniq_chars_count, FF_MAX_CHARS);
@@ -292,6 +294,7 @@ init_fastfind(struct fastfind_index *index, enum fastfind_flags flags)
 
 	info->min_key_len = FF_MAX_KEYLEN;
 	info->case_aware = !!(flags & FF_CASE_AWARE);
+	info->locale_indep = !!(flags & FF_LOCALE_INDEP);
 	info->compress = !!(flags & FF_COMPRESS);
 
 	FF_DBG_mem(info, sizeof(*info) - sizeof(info->debug));
@@ -434,7 +437,7 @@ compress_tree(struct ff_node *leafset, struct fastfind_info *info)
 	}
 }
 
-#define ifcase(c) (info->case_aware ? (c) : toupper(c))
+#define ifcase(c) ( info->case_aware ? (c) : (info->locale_indep ? c_toupper(c) : toupper(c)) )
 
 struct fastfind_index *
 fastfind_index(struct fastfind_index *index, enum fastfind_flags flags)
@@ -622,7 +625,10 @@ fastfind_search(struct fastfind_index *index,
 	if (info->case_aware)
 		FF_SEARCH(key[i]);
 	else
-		FF_SEARCH(toupper(key[i]));
+		if (info->locale_indep)
+			FF_SEARCH(c_toupper(key[i]));
+		else
+			FF_SEARCH(toupper(key[i]));
 
 	return NULL;
 }
diff --git a/src/util/fastfind.h b/src/util/fastfind.h
index a6b85585..b0142782 100644
--- a/src/util/fastfind.h
+++ b/src/util/fastfind.h
@@ -19,6 +19,8 @@ enum fastfind_flags {
 	FF_NONE = 0,
 	FF_CASE_AWARE = 1,	/**< honour case when comparing */
 	FF_COMPRESS = 2,	/**< compress nodes if possible */
+	FF_LOCALE_INDEP = 4	/**< whether the case conversion is
+				 *   locale independent or not */
 };
 
 struct fastfind_index {
diff --git a/src/util/scanner.c b/src/util/scanner.c
index 949d6016..c0840099 100644
--- a/src/util/scanner.c
+++ b/src/util/scanner.c
@@ -25,7 +25,7 @@ map_scanner_string(struct scanner *scanner,
 
 	for (; mappings->name; mappings++) {
 		if (mappings->base_type == base_type
-		    && !strlcasecmp(mappings->name, -1, ident, length))
+		    && !c_strlcasecmp(mappings->name, -1, ident, length))
 			return mappings->type;
 	}
 
diff --git a/src/util/scanner.h b/src/util/scanner.h
index 615142eb..64d5fc38 100644
--- a/src/util/scanner.h
+++ b/src/util/scanner.h
@@ -2,6 +2,7 @@
 #define EL__UTIL_SCANNER_H
 
 #include "util/error.h"
+#include "util/string.h"
 
 /* Define if you want a talking scanner */
 /* #define DEBUG_SCANNER */
@@ -29,7 +30,7 @@ struct scanner_token {
 
 /** Compare the string of @a token with @a str */
 #define scanner_token_strlcasecmp(token, str, len) \
-	((token) && !strlcasecmp((token)->string, (token)->length, str, len))
+	((token) && !c_strlcasecmp((token)->string, (token)->length, str, len))
 
 /** Also compares the token string but using a "static" string */
 #define scanner_token_contains(token, str) \
diff --git a/src/util/string.c b/src/util/string.c
index 076c491b..0d0cbb9f 100644
--- a/src/util/string.c
+++ b/src/util/string.c
@@ -14,6 +14,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <limits.h>
 
 #include "elinks.h"
 
@@ -233,11 +234,110 @@ elinks_strlcmp(const unsigned char *s1, size_t n1,
 
 int
 elinks_strlcasecmp(const unsigned char *s1, size_t n1,
-		   const unsigned char *s2, size_t n2)
+		   const unsigned char *s2, size_t n2,
+		   const int locale_indep)
 {
-	strlcmp_device("strlcasecmp", s1, n1, s2, n2, toupper(s1[p]), toupper(s2[p]));
+	if (locale_indep) {
+		strlcmp_device("strlcasecmp", s1, n1, s2, n2, c_toupper(s1[p]), c_toupper(s2[p]));
+	}
+	else {
+		strlcmp_device("strlcasecmp", s1, n1, s2, n2, toupper(s1[p]), toupper(s2[p]));
+	}
 }
 
+/* c_strcasecmp
+ * Taken from GNU coreutils (version 6.9)
+ * File name: lib/c-strcasecmp.c
+ * Copyright (C) 1998-1999, 2005-2006 Free Software Foundation, Inc.
+ * Licensed under the GPL version 2 or any later version.
+ */
+int c_strcasecmp (const char *s1, const char *s2)
+{
+  register const unsigned char *p1 = (const unsigned char *) s1;
+  register const unsigned char *p2 = (const unsigned char *) s2;
+  unsigned char c1, c2;
+
+  if (p1 == p2)
+    return 0;
+
+  do
+    {
+      c1 = c_tolower (*p1);
+      c2 = c_tolower (*p2);
+
+      if (c1 == '\0')
+	break;
+
+      ++p1;
+      ++p2;
+    }
+  while (c1 == c2);
+
+  if (UCHAR_MAX <= INT_MAX)
+    return c1 - c2;
+  else
+    /* On machines where 'char' and 'int' are types of the same size, the
+       difference of two 'unsigned char' values - including the sign bit -
+       doesn't fit in an 'int'.  */
+    return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
+}
+
+/* c_strncasecmp
+ * Taken from GNU coreutils (version 6.9)
+ * File name: lib/c-strncasecmp.c
+ *                     ^ (note the "n")
+ * Copyright (C) 1998-1999, 2005-2006 Free Software Foundation, Inc.
+ * Licensed under the GPL version 2 or any later version.
+ */
+int c_strncasecmp (const char *s1, const char *s2, size_t n)
+{
+  register const unsigned char *p1 = (const unsigned char *) s1;
+  register const unsigned char *p2 = (const unsigned char *) s2;
+  unsigned char c1, c2;
+
+  if (p1 == p2 || n == 0)
+    return 0;
+
+  do
+    {
+      c1 = c_tolower (*p1);
+      c2 = c_tolower (*p2);
+
+      if (--n == 0 || c1 == '\0')
+	break;
+
+      ++p1;
+      ++p2;
+    }
+  while (c1 == c2);
+
+  if (UCHAR_MAX <= INT_MAX)
+    return c1 - c2;
+  else
+    /* On machines where 'char' and 'int' are types of the same size, the
+       difference of two 'unsigned char' values - including the sign bit -
+       doesn't fit in an 'int'.  */
+    return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
+}
+
+/* c_strcasestr - adapted from src/osdep/stub.c */
+char * c_strcasestr(const char *haystack, const char *needle)
+{
+	size_t haystack_length = strlen(haystack);
+	size_t needle_length = strlen(needle);
+	int i;
+
+	if (haystack_length < needle_length)
+		return NULL;
+
+	for (i = haystack_length - needle_length + 1; i; i--) {
+		if (!c_strncasecmp(haystack, needle, needle_length))
+			return (char *) haystack;
+		haystack++;
+	}
+
+	return NULL;
+}
 
 /* The new string utilities: */
 
diff --git a/src/util/string.h b/src/util/string.h
index 0008863d..bfce8976 100644
--- a/src/util/string.h
+++ b/src/util/string.h
@@ -100,9 +100,19 @@ int elinks_strlcmp(const unsigned char *s1, size_t n1,
 		   const unsigned char *s2, size_t n2);
 
 /** Acts identically to strlcmp(), except for being case insensitive. */
-#define strlcasecmp(a,b,c,d) (errfile = __FILE__, errline = __LINE__, elinks_strlcasecmp(a,b,c,d))
+#define strlcasecmp(a,b,c,d) (errfile = __FILE__, errline = __LINE__, elinks_strlcasecmp(a,b,c,d,0))
+#define c_strlcasecmp(a,b,c,d) (errfile = __FILE__, errline = __LINE__, elinks_strlcasecmp(a,b,c,d,1))
 int elinks_strlcasecmp(const unsigned char *s1, size_t n1,
-		       const unsigned char *s2, size_t n2);
+		       const unsigned char *s2, size_t n2,
+		       const int locale_indep);
+
+/* strcasecmp and strncasecmp which work as if they are
+ * in the C locale - both taken from GNU coreutils */
+int c_strcasecmp(const char *s1, const char *s2);
+int c_strncasecmp(const char *s1, const char *s2, size_t n);
+
+/* strcasestr function which works as if it is in the C locale. */
+char * c_strcasestr(const char *haystack, const char *needle);
 
 /** @} */