string/argz-addsep.c

   1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <argz.h>
  21 #include <errno.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25
  26 error_t
  27 __argz_add_sep (char **argz, size_t *argz_len, const char *string, int delim)
  28 {
  29   size_t nlen = strlen (string) + 1;
  30
  31   if (nlen > 1)
  32     {
  33       const char *rp;
  34       char *wp;
  35
  36       *argz = (char *) realloc (*argz, *argz_len + nlen);
  37       if (*argz == NULL)
  38         return ENOMEM;
  39
  40       wp = *argz + *argz_len;
  41       rp = string;
  42       do
  43         if (*rp == delim)
  44           {
  45             if (wp > *argz && wp[-1] != '\0')
  46               *wp++ = '\0';
  47             else
  48               --nlen;
  49           }
  50         else
  51           *wp++ = *rp;
  52       while (*rp++ != '\0');
  53
  54       *argz_len += nlen;
  55     }
  56
  57   return 0;
  58 }
  59 weak_alias (__argz_add_sep, argz_add_sep)