strdup.h

   1 /*
   2  * This is free and unencumbered software released into the public domain.
   3  *
   4  * Anyone is free to copy, modify, publish, use, compile, sell, or
   5  * distribute this software, either in source code form or as a compiled
   6  * binary, for any purpose, commercial or non-commercial, and by any
   7  * means.
   8  *
   9  * In jurisdictions that recognize copyright laws, the author or authors
  10  * of this software dedicate any and all copyright interest in the
  11  * software to the public domain. We make this dedication for the benefit
  12  * of the public at large and to the detriment of our heirs and
  13  * successors. We intend this dedication to be an overt act of
  14  * relinquishment in perpetuity of all present and future rights to this
  15  * software under copyright law.
  16
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  * For more information, please refer to <https://unlicense.org>
  26  */
  27
  28 /* https://git.datadissipation.net */
  29 #ifndef STRDUP_H_
  30  #define STRDUP_H_      1
  31
  32  #ifdef STRDUP_INCLUDE_LIBC
  33   #include <stdlib.h>
  34   #include <string.h>
  35  #endif /* STRDUP_INCLUDE_LIBC */
  36
  37  #ifndef HAVE_STRDUP
  38   #define HAVE_STRDUP   1
  39   #define strdup        i_strdup_
  40   #define strndup       i_strndup_
  41 char *i_strdup_(const char *s);
  42 char *i_strndup_(const char *s, size_t n);
  43  #endif /* !HAVE_STRDUP */
  44
  45  #ifdef STRDUP_IMPLEMENTATION
  46 char *
  47 i_strdup_(const char *s)
  48 {
  49         /* avoid calling strlen twice by passing the maximum */
  50         return i_strndup_(s, ~(size_t)0);
  51 }
  52
  53 char *
  54 i_strndup_(const char *s, size_t n)
  55 {
  56         char *d;
  57         size_t t;
  58
  59         t = strlen(s) + 1;
  60         t = t < n ? t : n;
  61         d = malloc(t);
  62
  63         if (!d) return NULL;
  64         *(d + t) = '\0';
  65
  66         return memcpy(d, s, t - 1);
  67 }
  68  #endif /* STRDUP_IMPLEMENTATION */
  69 #endif /* !STRDUP_H_ */