malloc.c

   1 /*
   2  * malloc.c: safe wrappers around malloc, realloc, free, strdup
   3  */
   4
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include "puzzles.h"
   8
   9 /*
  10  * smalloc should guarantee to return a useful pointer - Halibut
  11  * can do nothing except die when it's out of memory anyway.
  12  */
  13 void *smalloc(size_t size) {
  14     void *p;
  15     p = malloc(size);
  16     if (!p)
  17         fatal("out of memory");
  18     return p;
  19 }
  20
  21 /*
  22  * sfree should guaranteeably deal gracefully with freeing NULL
  23  */
  24 void sfree(void *p) {
  25     if (p) {
  26         free(p);
  27     }
  28 }
  29
  30 /*
  31  * srealloc should guaranteeably be able to realloc NULL
  32  */
  33 void *srealloc(void *p, size_t size) {
  34     void *q;
  35     if (p) {
  36         q = realloc(p, size);
  37     } else {
  38         q = malloc(size);
  39     }
  40     if (!q)
  41         fatal("out of memory");
  42     return q;
  43 }
  44
  45 /*
  46  * dupstr is like strdup, but with the never-return-NULL property
  47  * of smalloc (and also reliably defined in all environments :-)
  48  */
  49 char *dupstr(const char *s) {
  50     char *r = smalloc(1+strlen(s));
  51     strcpy(r,s);
  52     return r;
  53 }