pebble/platform/tintin/boot/libc/string/strstr.c
2025-01-27 11:38:16 -08:00

36 lines
1,007 B
C

/*
* Copyright 2024 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
///////////////////////////////////////
// Implements:
// char *strstr(const char *s1, const char *s2);
///////////////////////////////////////
// Notes:
// Tuned for code size.
#include <stddef.h>
#include <string.h>
char *strstr(const char *s1, const char *s2) {
size_t len = strlen(s2);
while (*s1) {
if (strncmp(s1, s2, len) == 0) {
return (char*)s1;
}
s1++;
}
return NULL;
}