| 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 | const 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 | } |