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

40 lines
1.1 KiB
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 *strchr(const char *s1, int c);
// char *strrchr(const char *s1, int c);
///////////////////////////////////////
#include <stddef.h>
#include <string.h>
char *strchr(const char *s, int c) {
size_t n = strlen(s) + 1;
return memchr(s, c, n);
}
char *strrchr(const char *s, int c) {
char ch = (char)c;
size_t i = strlen(s);
do {
if (s[i] == ch) {
return (char*)&s[i];
}
} while (i--);
return NULL;
}