mirror of
https://github.com/rkd77/elinks.git
synced 2024-12-04 14:46:47 -05:00
378 lines
8.4 KiB
C
378 lines
8.4 KiB
C
/* Libc stub functions */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <errno.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h> /* SunOS needs this after sys/types.h */
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h> /* OS/2 needs this after sys/types.h */
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#include "elinks.h"
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#include "osdep/stub.h"
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#include "util/conv.h"
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/* These stubs are exception to our "Use (unsigned char *)!" rule. This is
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* because the stubbed functions are defined using (char *), and we could get
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* in trouble with this. Or when you use (foo ? strstr() : strcasestr()) and
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* one of these is system and another stub, we're in trouble and get "Pointer
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* type mismatch in conditional expression", game over. */
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#define toupper_equal(s1, s2) (toupper(*((char *) s1)) == toupper(*((char *) s2)))
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#define toupper_delta(s1, s2) (toupper(*((char *) s1)) - toupper(*((char *) s2)))
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#ifndef HAVE_STRCASECMP
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inline int
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elinks_strcasecmp(const char *s1, const char *s2)
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{
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while (*s1 != '\0' && toupper_equal(s1, s2)) {
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s1++;
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s2++;
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}
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return toupper_delta(s1, s2);
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}
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#endif /* !HAVE_STRCASECMP */
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#ifndef HAVE_STRNCASECMP
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inline int
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elinks_strncasecmp(const char *s1, const char *s2, size_t len)
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{
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if (len == 0)
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return 0;
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while (len-- != 0 && toupper_equal(s1, s2)) {
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if (len == 0 || *s1 == '\0' || *s2 == '\0')
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return 0;
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s1++;
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s2++;
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}
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return toupper_delta(s1, s2);
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}
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#endif /* !HAVE_STRNCASECMP */
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#ifndef HAVE_STRCASESTR
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/* Stub for strcasestr(), GNU extension */
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inline char *
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elinks_strcasestr(const char *haystack, const char *needle)
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{
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size_t haystack_length = strlen(haystack);
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size_t needle_length = strlen(needle);
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int i;
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if (haystack_length < needle_length)
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return NULL;
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for (i = haystack_length - needle_length + 1; i; i--) {
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if (!strncasecmp(haystack, needle, needle_length))
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return (char *) haystack;
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haystack++;
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}
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return NULL;
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}
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#endif
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#ifndef HAVE_STRDUP
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inline char *
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elinks_strdup(const char *str)
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{
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int str_len = strlen(str);
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char *new = malloc(str_len + 1);
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if (new) {
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if (str_len) memcpy(new, str, str_len);
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new[str_len] = '\0';
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}
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return new;
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}
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#endif
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#ifndef HAVE_STRERROR
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/* Many older systems don't have this, but have the global sys_errlist array
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* instead. */
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#if 0
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extern int sys_nerr;
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extern const char *const sys_errlist[];
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#endif
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inline const char *
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elinks_strerror(int err_no)
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{
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if (err_no < 0 || err_no > sys_nerr)
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return (const char *) "Unknown Error";
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else
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return (const char *) sys_errlist[err_no];
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}
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#endif
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#ifndef HAVE_STRSTR
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/* From http://www.unixpapa.com/incnote/string.html */
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inline char *
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elinks_strstr(const char *s, const char *p)
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{
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char *sp, *pp;
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for (sp = (char *) s, pp = (char *) p; *sp && *pp; )
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{
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if (*sp == *pp) {
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sp++;
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pp++;
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} else {
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sp = sp - (pp - p) + 1;
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pp = (char *) p;
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}
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}
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return (*pp ? NULL : sp - (pp - p));
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}
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#endif
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#if !defined(HAVE_MEMMOVE) && !defined(HAVE_BCOPY)
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/* The memmove() function is a bit rarer than the other memory functions -
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* some systems that have the others don't have this. It is identical to
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* memcpy() but is guaranteed to work even if the strings overlap.
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* Most systems that don't have memmove() do have
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* the BSD bcopy() though some really old systems have neither.
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* Note that bcopy() has the order of the source and destination
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* arguments reversed.
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* From http://www.unixpapa.com/incnote/string.html */
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/* Modified for ELinks by Zas. */
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inline void *
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elinks_memmove(void *d, const void *s, size_t n)
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{
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register char *dst = (char *) d;
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register char *src = (char *) s;
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if (!n || src == dst) return (void *) dst;
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if (src > dst)
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for (; n > 0; n--)
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*(dst++) = *(src++);
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else
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for (dst += n - 1, src += n - 1;
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n > 0;
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n--)
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*(dst--) = *(src--);
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return (void *) dst;
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}
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#endif
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#ifndef HAVE_STPCPY
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inline char *
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elinks_stpcpy(char *dest, const char *src)
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{
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while ((*dest++ = *src++));
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return (dest - 1);
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}
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#endif
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#ifndef HAVE_MEMPCPY
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inline void *
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elinks_mempcpy(void *dest, const void *src, size_t n)
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{
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return (void *) ((char *) memcpy(dest, src, n) + n);
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}
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#endif
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#ifndef HAVE_ISDIGIT
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inline int
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elinks_isdigit(int i)
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{
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return i >= '0' && i <= '9';
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}
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#endif
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#ifndef HAVE_MEMRCHR
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inline void *
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elinks_memrchr(const void *s, int c, size_t n)
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{
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char *pos = (char *) s;
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while (n > 0) {
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if (pos[n - 1] == (char) c)
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return (void *) &pos[n - 1];
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n--;
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}
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return NULL;
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}
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#endif
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#ifndef HAVE_RAISE
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#if !defined(HAVE_KILL) || !defined(HAVE_GETPID)
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#error The raise() stub function requires kill() and getpid()
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#endif
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int
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elinks_raise(int signal)
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{
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return(kill(getpid(), signal));
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}
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#endif
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#ifndef HAVE_INET_NTOP
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/* Original code by Paul Vixie. Modified by Gisle Vanem. */
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#define IN6ADDRSZ 16
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#define INADDRSZ 4
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#define INT16SZ 2
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/* TODO: Move and populate. --jonas */
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#ifdef CONFIG_OS_WIN32
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#define SET_ERRNO(e) WSASetLastError(errno = (e))
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#else
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#define SET_ERRNO(e) errno = e
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#endif
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/* Format an IPv4 address, more or less like inet_ntoa().
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*
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* Returns `dst' (as a const)
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* Note:
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* - uses no statics
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* - takes a unsigned char * not an in_addr as input */
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static const char *
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elinks_inet_ntop4(const unsigned char *src, unsigned char *dst, size_t size)
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{
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const unsigned char *addr = inet_ntoa(*(struct in_addr*)src);
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if (strlen(addr) >= size) {
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SET_ERRNO(ENOSPC);
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return NULL;
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}
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return strcpy(dst, addr);
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}
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#ifdef CONFIG_IPV6
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/* Convert IPv6 binary address into presentation (printable) format. */
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static const char *
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elinks_inet_ntop6(const unsigned char *src, char *dst, size_t size)
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{
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/* Note that int32_t and int16_t need only be "at least" large enough
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* to contain a value of the specified size. On some systems, like
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* Crays, there is no such thing as an integer variable with 16 bits.
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* Keep this in mind if you think this function should have been coded
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* to use pointer overlays. All the world's not a VAX. */
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unsigned char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
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unsigned char *tp;
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struct {
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long base;
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long len;
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} best, cur;
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unsigned long words[IN6ADDRSZ / INT16SZ];
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int i;
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/* Preprocess:
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* Copy the input (bytewise) array into a wordwise array.
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* Find the longest run of 0x00's in src[] for :: shorthanding. */
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memset(words, 0, sizeof(words));
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for (i = 0; i < IN6ADDRSZ; i++)
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words[i/2] |= (src[i] << ((1 - (i % 2)) << 3));
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best.base = -1;
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cur.base = -1;
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for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
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if (words[i] == 0) {
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if (cur.base == -1)
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cur.base = i, cur.len = 1;
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else
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cur.len++;
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} else if (cur.base != -1) {
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if (best.base == -1 || cur.len > best.len)
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best = cur;
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cur.base = -1;
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}
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}
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if ((cur.base != -1) && (best.base == -1 || cur.len > best.len))
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best = cur;
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if (best.base != -1 && best.len < 2)
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best.base = -1;
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/* Format the result. */
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for (tp = tmp, i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
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/* Are we inside the best run of 0x00's? */
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if (best.base != -1 && i >= best.base && i < (best.base + best.len)) {
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if (i == best.base)
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*tp++ = ':';
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continue;
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}
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/* Are we following an initial run of 0x00s or any real hex? */
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if (i != 0) *tp++ = ':';
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/* Is this address an encapsulated IPv4? */
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if (i == 6 && best.base == 0
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&& (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
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if (!elinks_inet_ntop4(src + 12, tp, sizeof(tmp) - (tp - tmp))) {
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SET_ERRNO(ENOSPC);
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return NULL;
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}
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tp += strlen(tp);
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break;
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}
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tp += snprintf(tp, 5, "%lx", words[i]);
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}
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/* Was it a trailing run of 0x00's? */
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if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
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*tp++ = ':';
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*tp++ = '\0';
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/* Check for overflow, copy, and we're done. */
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if ((size_t) (tp - tmp) > size) {
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SET_ERRNO(ENOSPC);
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return NULL;
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}
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return strcpy(dst, tmp);
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}
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#endif /* CONFIG_IPV6 */
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/* Convert a network format address to presentation format.
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*
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* Returns pointer to presentation format address (`dst'),
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* Returns NULL on error (see errno). */
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const char *
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elinks_inet_ntop(int af, const void *src, char *dst, size_t size)
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{
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switch (af) {
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case AF_INET:
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return elinks_inet_ntop4((const unsigned char *) src, dst, size);
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#ifdef CONFIG_IPV6
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case AF_INET6:
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return elinks_inet_ntop6((const unsigned char *) src, dst, size);
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#endif
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default:
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SET_ERRNO(EAFNOSUPPORT);
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return NULL;
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}
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}
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#endif /* HAVE_INET_NTOP */
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