release/src/router/busybox/libbb/platform.c

   1 /*
   2  * Replacements for common but usually nonstandard functions that aren't
   3  * supplied by all platforms.
   4  *
   5  * Copyright (C) 2009 by Dan Fandrich <dan@coneharvesters.com>, et. al.
   6  *
   7  * Licensed under GPLv2, see file LICENSE in this source tree.
   8  */
   9 #include "libbb.h"
  10
  11 #ifndef HAVE_STRCHRNUL
  12 char* FAST_FUNC strchrnul(const char *s, int c)
  13 {
  14         while (*s != '\0' && *s != c)
  15                 s++;
  16         return (char*)s;
  17 }
  18 #endif
  19
  20 #ifndef HAVE_VASPRINTF
  21 int FAST_FUNC vasprintf(char **string_ptr, const char *format, va_list p)
  22 {
  23         int r;
  24         va_list p2;
  25         char buf[128];
  26
  27         va_copy(p2, p);
  28         r = vsnprintf(buf, 128, format, p);
  29         va_end(p);
  30
  31         /* Note: can't use xstrdup/xmalloc, they call vasprintf (us) on failure! */
  32
  33         if (r < 128) {
  34                 va_end(p2);
  35                 *string_ptr = strdup(buf);
  36                 return (*string_ptr ? r : -1);
  37         }
  38
  39         *string_ptr = malloc(r+1);
  40         r = (*string_ptr ? vsnprintf(*string_ptr, r+1, format, p2) : -1);
  41         va_end(p2);
  42
  43         return r;
  44 }
  45 #endif
  46
  47 #ifndef HAVE_DPRINTF
  48 /* dprintf is now part of POSIX.1, but was only added in 2008 */
  49 int dprintf(int fd, const char *format, ...)
  50 {
  51         va_list p;
  52         int r;
  53         char *string_ptr;
  54
  55         va_start(p, format);
  56         r = vasprintf(&string_ptr, format, p);
  57         va_end(p);
  58         if (r >= 0) {
  59                 r = full_write(fd, string_ptr, r);
  60                 free(string_ptr);
  61         }
  62         return r;
  63 }
  64 #endif
  65
  66 #ifndef HAVE_MEMRCHR
  67 /* Copyright (C) 2005 Free Software Foundation, Inc.
  68  * memrchr() is a GNU function that might not be available everywhere.
  69  * It's basically the inverse of memchr() - search backwards in a
  70  * memory block for a particular character.
  71  */
  72 void* FAST_FUNC memrchr(const void *s, int c, size_t n)
  73 {
  74         const char *start = s, *end = s;
  75
  76         end += n - 1;
  77
  78         while (end >= start) {
  79                 if (*end == (char)c)
  80                         return (void *) end;
  81                 end--;
  82         }
  83
  84         return NULL;
  85 }
  86 #endif
  87
  88 #ifndef HAVE_MKDTEMP
  89 /* This is now actually part of POSIX.1, but was only added in 2008 */
  90 char* FAST_FUNC mkdtemp(char *template)
  91 {
  92         if (mktemp(template) == NULL || mkdir(template, 0700) != 0)
  93                 return NULL;
  94         return template;
  95 }
  96 #endif
  97
  98 #ifndef HAVE_STRCASESTR
  99 /* Copyright (c) 1999, 2000 The ht://Dig Group */
 100 char* FAST_FUNC strcasestr(const char *s, const char *pattern)
 101 {
 102         int length = strlen(pattern);
 103
 104         while (*s) {
 105                 if (strncasecmp(s, pattern, length) == 0)
 106                         return (char *)s;
 107                 s++;
 108         }
 109         return 0;
 110 }
 111 #endif
 112
 113 #ifndef HAVE_STRSEP
 114 /* Copyright (C) 2004 Free Software Foundation, Inc. */
 115 char* FAST_FUNC strsep(char **stringp, const char *delim)
 116 {
 117         char *start = *stringp;
 118         char *ptr;
 119
 120         if (!start)
 121                 return NULL;
 122
 123         if (!*delim)
 124                 ptr = start + strlen(start);
 125         else {
 126                 ptr = strpbrk(start, delim);
 127                 if (!ptr) {
 128                         *stringp = NULL;
 129                         return start;
 130                 }
 131         }
 132
 133         *ptr = '\0';
 134         *stringp = ptr + 1;
 135
 136         return start;
 137 }
 138 #endif
 139
 140 #ifndef HAVE_STPCPY
 141 char* FAST_FUNC stpcpy(char *p, const char *to_add)
 142 {
 143         while ((*p = *to_add) != '\0') {
 144                 p++;
 145                 to_add++;
 146         }
 147         return p;
 148 }
 149 #endif
 150
 151 #ifndef HAVE_GETLINE
 152 ssize_t FAST_FUNC getline(char **lineptr, size_t *n, FILE *stream)
 153 {
 154         int ch;
 155         char *line = *lineptr;
 156         size_t alloced = *n;
 157         size_t len = 0;
 158
 159         do {
 160                 ch = fgetc(stream);
 161                 if (ch == EOF)
 162                         break;
 163                 if (len + 1 >= alloced) {
 164                         alloced += alloced/4 + 64;
 165                         line = xrealloc(line, alloced);
 166                 }
 167                 line[len++] = ch;
 168         } while (ch != '\n');
 169
 170         if (len == 0)
 171                 return -1;
 172
 173         line[len] = '\0';
 174         *lineptr = line;
 175         *n = alloced;
 176         return len;
 177 }
 178 #endif