usr.bin/m4/lib/ohash_create_entry.c

   1 /* $OpenBSD: ohash_create_entry.c,v 1.2 2004/06/22 20:00:16 espie Exp $ */
   2 /* ex:ts=8 sw=4:
   3  */
   4
   5 /* Copyright (c) 1999, 2004 Marc Espie <espie@openbsd.org>
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #include "ohash_int.h"
  21
  22 /* This handles the common case of variable length keys, where the
  23  * key is stored at the end of the record.
  24  */
  25 void *
  26 ohash_create_entry(struct ohash_info *i, const char *start, const char **end)
  27 {
  28         char *p;
  29
  30         if (!*end)
  31                 *end = start + strlen(start);
  32         p = (i->alloc)(i->key_offset + (*end - start) + 1, i->data);
  33         if (p) {
  34             memcpy(p+i->key_offset, start, *end-start);
  35             p[i->key_offset + (*end - start)] = '\0';
  36         }
  37         return (void *)p;
  38 }