mdw@git.distorted.org.uk Git - sgt/puzzles/blob - malloc.c

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