icuSources/tools/tzcode/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 /*LINTLIBRARY*/
   7
   8 #include "private.h"
   9
  10 char *
  11 icatalloc(char *const old, const char *const new)
  12 {
  13         register char * result;
  14         register int    oldsize, newsize;
  15
  16         newsize = (new == NULL) ? 0 : strlen(new);
  17         if (old == NULL)
  18                 oldsize = 0;
  19         else if (newsize == 0)
  20                 return old;
  21         else    oldsize = strlen(old);
  22         if ((result = realloc(old, oldsize + newsize + 1)) != NULL)
  23                 if (new != NULL)
  24                         (void) strcpy(result + oldsize, new);
  25         return result;
  26 }
  27
  28 char *
  29 icpyalloc(const char *const string)
  30 {
  31         return icatalloc(NULL, string);
  32 }