strlcpy, strlcat: print program name, use for usage

... same as sbase libutil/strl{cat,cpy}.c. Fix comment in util.h

libutil/eprintf.c

@@ -33,9 +33,8 @@ enprintf(int status, const char *fmt, ...)
 void
 venprintf(int status, const char *fmt, va_list ap)
 {
-#ifdef DEBUG
-	fprintf(stderr, "%s: ", argv0);
-#endif
+	if (strncmp(fmt, "usage", strlen("usage")))
+		fprintf(stderr, "%s: ", argv0);
 
 	vfprintf(stderr, fmt, ap);
 
@@ -52,9 +51,8 @@ weprintf(const char *fmt, ...)
 {
 	va_list ap;
 
-#ifdef DEBUG
-	fprintf(stderr, "%s: ", argv0);
-#endif
+	if (strncmp(fmt, "usage", strlen("usage")))
+		fprintf(stderr, "%s: ", argv0);
 
 	va_start(ap, fmt);
 	vfprintf(stderr, fmt, ap);

libutil/strlcat.c

@@ -50,3 +50,14 @@ strlcat(char *dst, const char *src, size_t siz)
 	*d = '\0';
 	return(dlen + (s - src)); /* count does not include NUL */
 }
+
+size_t
+estrlcat(char *dst, const char *src, size_t siz)
+{
+	size_t ret;
+
+	if ((ret = strlcat(dst, src, siz)) >= siz)
+		eprintf("strlcat: input string too long\n");
+
+	return ret;
+}

libutil/strlcpy.c

@@ -46,3 +46,14 @@ strlcpy(char *dst, const char *src, size_t siz)
 	}
 	return(s - src - 1); /* count does not include NUL */
 }
+
+size_t
+estrlcpy(char *dst, const char *src, size_t siz)
+{
+	size_t ret;
+
+	if ((ret = strlcpy(dst, src, siz)) >= siz)
+		eprintf("strlcpy: input string too long\n");
+
+	return ret;
+}

util.h

@@ -40,13 +40,15 @@ void putword(const char *);
 /* recurse.c */
 void recurse(const char *, void (*)(const char *));
 
-/* strlcpy.c */
+/* strlcat.c */
 #undef strlcat
 size_t strlcat(char *, const char *, size_t);
+size_t estrlcat(char *, const char *, size_t);
 
-/* strlcat.c */
+/* strlcpy.c */
 #undef strlcpy
 size_t strlcpy(char *, const char *, size_t);
+size_t estrlcpy(char *, const char *, size_t);
 
 /* tty.c */
 void devtotty(int, int *, int *);