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

45 lines
1.2 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 *strcat(char *s1, const char *s2);
// char *strncat(char *s1, const char *s2, size_t n);
///////////////////////////////////////
// Notes:
// Tuned for code size.
#include <string.h>
char *strcat(char * restrict s1, const char * restrict s2) {
char *rc = s1;
s1 += strlen(s1);
strcpy(s1, s2);
return rc;
}
char *strncat(char * restrict s1, const char * restrict s2, size_t n) {
char * rc = s1;
s1 += strlen(s1);
size_t strn = strlen(s2);
if (strn > n) {
strn = n;
}
memcpy(s1, s2, strn);
s1[strn] = '\0';
return rc;
}