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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [argz/] [argz_replace.c] - Blame information for rev 258

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Line No. Rev Author Line
1 207 jeremybenn
/* Copyright (C) 2002 by  Red Hat, Incorporated. All rights reserved.
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 *
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 * Permission to use, copy, modify, and distribute this software
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 * is freely granted, provided that this notice is preserved.
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 */
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#include <errno.h>
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#include <sys/types.h>
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#include <string.h>
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#include <stdlib.h>
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#include <argz.h>
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#include "buf_findstr.h"
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error_t
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_DEFUN (argz_replace, (argz, argz_len, str, with, replace_count),
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       char **argz _AND
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       size_t *argz_len _AND
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       const char *str _AND
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       const char *with _AND
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       unsigned *replace_count)
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{
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  const int str_len = strlen(str);
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  const int with_len = strlen(with);
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  const int len_diff = with_len - str_len;
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  char *buf_iter = *argz;
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  size_t buf_len = *argz_len;
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  char *last_iter = NULL;
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  char *new_argz = NULL;
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  size_t new_argz_len = 0;
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  char *new_argz_iter = NULL;
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  *replace_count = 0;
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  new_argz_len = *argz_len;
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  while(buf_len)
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    {
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      if(_buf_findstr(str, &buf_iter, &buf_len))
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        {
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          *replace_count += 1;
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          new_argz_len += len_diff;
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        }
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    }
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  if (*replace_count)
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    {
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      new_argz = (char *)malloc(new_argz_len);
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      buf_iter = *argz;
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      buf_len = *argz_len;
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      last_iter = buf_iter;
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      new_argz_iter = new_argz;
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      while(buf_len)
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        {
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          if (_buf_findstr(str, &buf_iter, &buf_len))
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            {
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              /* copy everything up to, but not including str, from old argz to
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                 new argz. */
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              memcpy(new_argz_iter, last_iter, buf_iter - last_iter - str_len);
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              new_argz_iter += (buf_iter - last_iter - str_len);
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              /* copy replacement string. */
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              memcpy(new_argz_iter, with, with_len);
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              new_argz_iter += with_len;
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              last_iter = buf_iter;
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            }
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        }
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      /* copy everything after last occurrence of str. */
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      memcpy(new_argz_iter, last_iter, *argz + *argz_len - last_iter);
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      /* reallocate argz, and copy over the new value. */
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      if(!(*argz = (char *)realloc(*argz, new_argz_len)))
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        return ENOMEM;
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      memcpy(*argz, new_argz, new_argz_len);
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      *argz_len = new_argz_len;
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      if (*argz_len == 0)
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        {
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          free(*argz);
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          *argz = NULL;
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        }
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      free(new_argz);
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    }
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  return 0;
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}

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