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_USLEEP
  21 int FAST_FUNC usleep(unsigned usec)
  22 {
  23         struct timespec ts;
  24         ts.tv_sec = usec / 1000000u;
  25         ts.tv_nsec = (usec % 1000000u) * 1000u;
  26         /*
  27          * If a signal has non-default handler, nanosleep returns early.
  28          * Our version of usleep doesn't return early
  29          * if interrupted by such signals:
  30          *
  31          */
  32         while (nanosleep(&ts, &ts) != 0)
  33                 continue;
  34         return 0;
  35 }
  36 #endif
  37
  38 #ifndef HAVE_VASPRINTF
  39 int FAST_FUNC vasprintf(char **string_ptr, const char *format, va_list p)
  40 {
  41         int r;
  42         va_list p2;
  43         char buf[128];
  44
  45         va_copy(p2, p);
  46         r = vsnprintf(buf, 128, format, p);
  47         va_end(p);
  48
  49         /* Note: can't use xstrdup/xmalloc, they call vasprintf (us) on failure! */
  50
  51         if (r < 128) {
  52                 va_end(p2);
  53                 *string_ptr = strdup(buf);
  54                 return (*string_ptr ? r : -1);
  55         }
  56
  57         *string_ptr = malloc(r+1);
  58         r = (*string_ptr ? vsnprintf(*string_ptr, r+1, format, p2) : -1);
  59         va_end(p2);
  60
  61         return r;
  62 }
  63 #endif
  64
  65 #ifndef HAVE_DPRINTF
  66 /* dprintf is now part of POSIX.1, but was only added in 2008 */
  67 int dprintf(int fd, const char *format, ...)
  68 {
  69         va_list p;
  70         int r;
  71         char *string_ptr;
  72
  73         va_start(p, format);
  74         r = vasprintf(&string_ptr, format, p);
  75         va_end(p);
  76         if (r >= 0) {
  77                 r = full_write(fd, string_ptr, r);
  78                 free(string_ptr);
  79         }
  80         return r;
  81 }
  82 #endif
  83
  84 #ifndef HAVE_MEMRCHR
  85 /* Copyright (C) 2005 Free Software Foundation, Inc.
  86  * memrchr() is a GNU function that might not be available everywhere.
  87  * It's basically the inverse of memchr() - search backwards in a
  88  * memory block for a particular character.
  89  */
  90 void* FAST_FUNC memrchr(const void *s, int c, size_t n)
  91 {
  92         const char *start = s, *end = s;
  93
  94         end += n - 1;
  95
  96         while (end >= start) {
  97                 if (*end == (char)c)
  98                         return (void *) end;
  99                 end--;
 100         }
 101
 102         return NULL;
 103 }
 104 #endif
 105
 106 #ifndef HAVE_MKDTEMP
 107 /* This is now actually part of POSIX.1, but was only added in 2008 */
 108 char* FAST_FUNC mkdtemp(char *template)
 109 {
 110         if (mktemp(template) == NULL || mkdir(template, 0700) != 0)
 111                 return NULL;
 112         return template;
 113 }
 114 #endif
 115
 116 #ifndef HAVE_STRCASESTR
 117 /* Copyright (c) 1999, 2000 The ht://Dig Group */
 118 char* FAST_FUNC strcasestr(const char *s, const char *pattern)
 119 {
 120         int length = strlen(pattern);
 121
 122         while (*s) {
 123                 if (strncasecmp(s, pattern, length) == 0)
 124                         return (char *)s;
 125                 s++;
 126         }
 127         return 0;
 128 }
 129 #endif
 130
 131 #ifndef HAVE_STRSEP
 132 /* Copyright (C) 2004 Free Software Foundation, Inc. */
 133 char* FAST_FUNC strsep(char **stringp, const char *delim)
 134 {
 135         char *start = *stringp;
 136         char *ptr;
 137
 138         if (!start)
 139                 return NULL;
 140
 141         if (!*delim)
 142                 ptr = start + strlen(start);
 143         else {
 144                 ptr = strpbrk(start, delim);
 145                 if (!ptr) {
 146                         *stringp = NULL;
 147                         return start;
 148                 }
 149         }
 150
 151         *ptr = '\0';
 152         *stringp = ptr + 1;
 153
 154         return start;
 155 }
 156 #endif
 157
 158 #ifndef HAVE_STPCPY
 159 char* FAST_FUNC stpcpy(char *p, const char *to_add)
 160 {
 161         while ((*p = *to_add) != '\0') {
 162                 p++;
 163                 to_add++;
 164         }
 165         return p;
 166 }
 167 #endif
 168
 169 #ifndef HAVE_GETLINE
 170 ssize_t FAST_FUNC getline(char **lineptr, size_t *n, FILE *stream)
 171 {
 172         int ch;
 173         char *line = *lineptr;
 174         size_t alloced = *n;
 175         size_t len = 0;
 176
 177         do {
 178                 ch = fgetc(stream);
 179                 if (ch == EOF)
 180                         break;
 181                 if (len + 1 >= alloced) {
 182                         alloced += alloced/4 + 64;
 183                         line = xrealloc(line, alloced);
 184                 }
 185                 line[len++] = ch;
 186         } while (ch != '\n');
 187
 188         if (len == 0)
 189                 return -1;
 190
 191         line[len] = '\0';
 192         *lineptr = line;
 193         *n = alloced;
 194         return len;
 195 }
 196 #endif