lib/string.c

   1 /*
   2  * Copyright (c) 2009, 2011, 2017 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18 #include <ctype.h>
  19 #include <string.h>
  20
  21 #include "util.h"
  22
  23 #ifndef HAVE_STRNLEN
  24 size_t
  25 strnlen(const char *s, size_t maxlen)
  26 {
  27     const char *end = memchr(s, '\0', maxlen);
  28     return end ? end - s : maxlen;
  29 }
  30 #endif
  31
  32 #ifdef _WIN32
  33 char *strcasestr(const char *str, const char *substr)
  34 {
  35     do {
  36         for (size_t i = 0; ; i++) {
  37             if (!substr[i]) {
  38                 return CONST_CAST(char *, str);
  39             } else if (tolower(substr[i]) != tolower(str[i])) {
  40                 break;
  41             }
  42         }
  43     } while (*str++);
  44     return NULL;
  45 }
  46 #endif