libiberty/strdup.c

   1 /*
   2
   3 @deftypefn Supplemental char* strdup (const char *@var{s})
   4
   5 Returns a pointer to a copy of @var{s} in memory obtained from
   6 @code{malloc}, or @code{NULL} if insufficient memory was available.
   7
   8 @end deftypefn
   9
  10 */
  11
  12 #include <ansidecl.h>
  13 #ifdef ANSI_PROTOTYPES
  14 #include <stddef.h>
  15 #else
  16 #define size_t unsigned long
  17 #endif
  18
  19 extern size_t   strlen PARAMS ((const char*));
  20 extern PTR      malloc PARAMS ((size_t));
  21 extern PTR      memcpy PARAMS ((PTR, const PTR, size_t));
  22
  23 char *
  24 strdup(s)
  25      char *s;
  26 {
  27   size_t len = strlen (s) + 1;
  28   char *result = (char*) malloc (len);
  29   if (result == (char*) 0)
  30     return (char*) 0;
  31   return (char*) memcpy (result, s, len);
  32 }