toolchain/gcc/newlib/libc/argz/buf_findstr.c

   1 /* Copyright (C) 2002 by  Red Hat, Incorporated. All rights reserved.
   2  *
   3  * Permission to use, copy, modify, and distribute this software
   4  * is freely granted, provided that this notice is preserved.
   5  */
   6
   7 #include <errno.h>
   8 #include <sys/types.h>
   9 #include <string.h>
  10 #include <stdlib.h>
  11
  12 #include "buf_findstr.h"
  13
  14 /* Find string str in buffer buf of length buf_len.  Point buf to character after string,
  15    or set it to NULL if end of buffer is reached.  Return 1 if found, 0 if not. */
  16 int
  17 _buf_findstr(const char *str, char **buf, size_t *buf_len)
  18 {
  19   int i = 0;
  20   int j = 0;
  21
  22   for (i = 0; i < *buf_len; i++)
  23     {
  24       if (str[0] == (*buf)[i])
  25         {
  26           j = i;
  27           while (str[j - i] && (str[j - i] == (*buf)[j])) j++;
  28           if(str[j - i] == '\0')
  29             {
  30               *buf += j;
  31               *buf_len -= j;
  32               return 1;
  33             }
  34         }
  35     }
  36
  37   if (i == *buf_len)
  38     {
  39       *buf += *buf_len;
  40       *buf_len = 0;
  41     }
  42
  43   return 0;
  44 }