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mirror of https://github.com/rkd77/elinks.git synced 2024-06-22 00:35:32 +00:00
elinks/src/osdep/stub.c
2006-01-11 20:10:27 +01:00

378 lines
8.4 KiB
C

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