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 #include <stddef.h>
14 
15 extern size_t	strlen (const char*);
16 extern PTR	malloc (size_t);
17 extern PTR	memcpy (PTR, const PTR, size_t);
18 
19 char *
strdup(const char * s)20 strdup(const char *s)
21 {
22   size_t len = strlen (s) + 1;
23   char *result = (char*) malloc (len);
24   if (result == (char*) 0)
25     return (char*) 0;
26   return (char*) memcpy (result, s, len);
27 }
28