include/babeltrace/compat/string.h

   1 #ifndef _BABELTRACE_COMPAT_STRING_H
   2 #define _BABELTRACE_COMPAT_STRING_H
   3
   4 /*
   5  * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  */
  25
  26 #include <string.h>
  27 #include <stdlib.h>
  28
  29 #if !defined(__linux__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))
  30
  31 /* XSI-compliant strerror_r */
  32 static inline
  33 int compat_strerror_r(int errnum, char *buf, size_t buflen)
  34 {
  35         return strerror_r(errnum, buf, buflen);
  36 }
  37
  38 #else
  39
  40 /* GNU-compliant strerror_r */
  41 static inline
  42 int compat_strerror_r(int errnum, char *buf, size_t buflen)
  43 {
  44         char *retbuf;
  45
  46         retbuf = strerror_r(errnum, buf, buflen);
  47         if (retbuf != buf)
  48                 strncpy(buf, retbuf, buflen);
  49         buf[buflen - 1] = '\0';
  50         return 0;
  51 }
  52
  53 #endif
  54
  55 #ifdef HAVE_STRNLEN
  56 static inline
  57 size_t bt_strnlen(const char *str, size_t max)
  58 {
  59         return strnlen(str, max);
  60 }
  61 #else
  62 static inline
  63 size_t bt_strnlen(const char *str, size_t max)
  64 {
  65         size_t ret;
  66         const char *end;
  67
  68         end = memchr(str, 0, max);
  69
  70         if (end) {
  71                 ret = (size_t) (end - str);
  72         } else {
  73                 ret = max;
  74         }
  75
  76         return ret;
  77 }
  78 #endif /* HAVE_STRNLEN */
  79
  80 #ifdef HAVE_STRNDUP
  81 static inline
  82 char *bt_strndup(const char *s, size_t n)
  83 {
  84         return strndup(s, n);
  85 }
  86 #else
  87 static inline
  88 char *bt_strndup(const char *s, size_t n)
  89 {
  90         char *ret;
  91         size_t navail;
  92
  93         if (!s) {
  94                 ret = NULL;
  95                 goto end;
  96         }
  97
  98         /* min() */
  99         navail = strlen(s) + 1;
 100         if ((n + 1) < navail) {
 101                 navail = n + 1;
 102         }
 103
 104         ret = malloc(navail);
 105         if (!ret) {
 106                 goto end;
 107         }
 108
 109         memcpy(ret, s, navail);
 110         ret[navail - 1] = '\0';
 111 end:
 112         return ret;
 113 }
 114 #endif /* HAVE_STRNDUP */
 115
 116 #endif /* _BABELTRACE_COMPAT_STRING_H */