Files
nanolibc/c/strings.c
2022-10-13 15:26:37 +00:00

49 lines
1.4 KiB
C

// Copyright 2022 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
//
// https://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.
/*
* Implementation of libC strings.h functions.
*/
#include <strings.h>
#include <ctype.h>
int strcasecmp(const char *p1, const char *p2) {
const unsigned char *s1 = (const unsigned char *)p1;
const unsigned char *s2 = (const unsigned char *)p2;
while (1) {
const unsigned int c1 = tolower(*s1++);
const unsigned int c2 = tolower(*s2++);
if ((c1 == '\0') || (c1 != c2)) return (c1 - c2);
}
/* not reached */
return 0;
}
int strncasecmp(const char *p1, const char *p2, size_t n) {
const unsigned char *s1 = (const unsigned char *)p1;
const unsigned char *s2 = (const unsigned char *)p2;
while (n > 0) {
const unsigned char c1 = tolower(*s1++);
const unsigned char c2 = tolower(*s2++);
if ((c1 == '\0') || (c1 != c2)) return (c1 - c2);
n--;
}
return 0;
}