buf_findstr.c

来自「KPIT GNU Tools is a set of GNU developme」· C语言 代码 · 共 45 行

/* Copyright (C) 2002 by  Red Hat, Incorporated. All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * is freely granted, provided that this notice is preserved.
 */

#include <errno.h>
#include <sys/types.h>
#include <string.h>
#include <stdlib.h>

#include "buf_findstr.h"

/* Find string str in buffer buf of length buf_len.  Point buf to character after string,
   or set it to NULL if end of buffer is reached.  Return 1 if found, 0 if not. */
int
_buf_findstr(const char *str, char **buf, size_t *buf_len)
{
  int i = 0;
  int j = 0;

  for (i = 0; i < *buf_len; i++)
    {
      if (str[0] == (*buf)[i])
        {
          j = i;
          while (str[j - i] && (str[j - i] == (*buf)[j])) j++;
          if(str[j - i] == '\0')
            {
              *buf += j;
              *buf_len -= j;
              return 1;
            }
        }
    }

  if (i == *buf_len)
    {
      *buf += *buf_len;
      *buf_len = 0;
    }

  return 0;
}