string/argz-addsep.c

   1 /* Copyright (C) 1996-2017 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <argz.h>
  20 #include <errno.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24
  25 error_t
  26 __argz_add_sep (char **argz, size_t *argz_len, const char *string, int delim)
  27 {
  28   size_t nlen = strlen (string) + 1;
  29
  30   if (nlen > 1)
  31     {
  32       const char *rp;
  33       char *wp;
  34
  35       *argz = (char *) realloc (*argz, *argz_len + nlen);
  36       if (*argz == NULL)
  37         return ENOMEM;
  38
  39       wp = *argz + *argz_len;
  40       rp = string;
  41       do
  42         if (*rp == delim)
  43           {
  44             if (wp > *argz && wp[-1] != '\0')
  45               *wp++ = '\0';
  46             else
  47               --nlen;
  48           }
  49         else
  50           *wp++ = *rp;
  51       while (*rp++ != '\0');
  52
  53       *argz_len += nlen;
  54     }
  55
  56   return 0;
  57 }
  58 weak_alias (__argz_add_sep, argz_add_sep)