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/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <stddef.h>
/**
* Returns the number of bytes in a NUL-terminated
* string. This excludes the NUL byte.
*
* @param str The string.
* @return The number of bytes before the first NUL byte.
*/
size_t strlen(const char* str)
{
/* TODO optimise strlen */
char* s = str;
while (*str++);
return (size_t)(s - 1 - str);
}
/**
* Variant of `strlen` that only inspects the
* beginning of s string.
*
* @param str The string.
* @param maxlen The number of bytes to inspect, at most.
* @return The number of bytes before, the first NUL byte.
* `maxlen` if no NUL byte was found.
*/
size_t strnlen(const char* str, size_t maxlen)
{
const char* end = memchr(str, 0, maxlen);
return end == NULL ? maxlen : (size_t)(end - str);
}
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