path: root/src/string/str/strchr.c

/**
 * slibc — Yet another C library
 * Copyright © 2015, 2016  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>


# pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"



/**
 * Find the first occurrence of a byte in a string.
 * 
 * `s = strchr(s, 0)` is a faster alternative to
 * `s = s + strlen(s)`.
 * 
 * @param   string  The string to search.
 *                  The terminating NUL character is
 *                  considered a part of the string.
 * @param   c       The sought after character.
 * @return          Pointer to the first occurrence of `c`,
 *                  `NULL` if none were found.
 * 
 * @since  Always.
 */
char* (strchr)(const char* string, int c)
{
  for (;;)
    if (*string == c)
      return string;
    else if (!*string++)
      return NULL;
}