usr.sbin/zic/ialloc.c

   1 /*
   2 ** This file is in the public domain, so clarified as of
   3 ** 2006-07-17 by Arthur David Olson.
   4 */
   5
   6 /*
   7  * $FreeBSD: src/usr.sbin/zic/ialloc.c,v 1.5 1999/08/28 01:21:18 peter Exp $
   8  */
   9 /*LINTLIBRARY*/
  10
  11 #include "private.h"
  12
  13 char *
  14 icatalloc(char *const old, const char * const new)
  15 {
  16         char *result;
  17         int oldsize, newsize;
  18
  19         newsize = (new == NULL) ? 0 : strlen(new);
  20         if (old == NULL)
  21                 oldsize = 0;
  22         else if (newsize == 0)
  23                 return old;
  24         else    oldsize = strlen(old);
  25         if ((result = realloc(old, oldsize + newsize + 1)) != NULL)
  26                 if (new != NULL)
  27                         strcpy(result + oldsize, new);
  28         return result;
  29 }
  30
  31 char *
  32 icpyalloc(const char * const string)
  33 {
  34         return icatalloc(NULL, string);
  35 }