thodg/acme-client/recallocarray.c

Branch : - branch - current master portable - tag -

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• Author : Thomas de Grivel
  Date : 2025-09-13 23:25:22
  Hash : 8e8636d2
  Message : do not define recallocarray if already available

• recallocarray.c

• #include <limits.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include "configure.h"
  #include "recallocarray.h"
  
  #if ! HAVE_RECALLOCARRAY
  
  void *
  recallocarray(void *ptr, size_t oldnmemb, size_t nmemb, size_t size)
  {
    size_t i;
    char *p;
    size_t s;
    s = 0;
    i = 0;
    if (oldnmemb == nmemb)
      return ptr;
    while (i < nmemb) {
      if (s > ULONG_MAX - size)
        return NULL;
      s += size;
      i++;
    }
    if (nmemb < oldnmemb)
      bzero((char *)ptr + nmemb * size, (oldnmemb - nmemb) * size);
    if (! (p = realloc(ptr, nmemb * size)))
      return NULL;
    if (nmemb > oldnmemb)
      bzero(p + oldnmemb * size, (nmemb - oldnmemb) * size);
    return p;
  }
  
  #endif /* ! HAVE_RECALLOCARRAY */