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#include <stdlib.h> #include <errno.h> void *calloc(size_t m, size_t n) { void *p; size_t *z; if (n && m > (size_t)-1/n) { errno = ENOMEM; return 0; } n *= m; p = malloc(n); if (!p) return 0; /* Only do this for non-mmapped chunks */ if (((size_t *)p)[-1] & 7) { /* Only write words that are not already zero */ m = (n + sizeof *z - 1)/sizeof *z; for (z=p; m; m--, z++) if (*z) *z=0; } return p; } |