strchr(3)                  Library Functions Manual                  strchr(3)

NAME
       strchr, strrchr, strchrnul - locate character in string

LIBRARY
       Standard C library (libc, -lc)

SYNOPSIS
       #include <string.h>

       char *strchr(const char *s, int c);
       char *strrchr(const char *s, int c);

       #define _GNU_SOURCE         /* See feature_test_macros(7) */
       #include <string.h>

       char *strchrnul(const char *s, int c);

DESCRIPTION
       The strchr() function returns a pointer to the first occurrence of the
       character c in the string s.

       The strrchr() function returns a pointer to the last occurrence of the
       character c in the string s.

       The strchrnul() function is like strchr() except that if c is not found
       in s, then it returns a pointer to the null byte at the end of s,
       rather than NULL.

       Here "character" means "byte"; these functions do not work with wide or
       multibyte characters.

RETURN VALUE
       The strchr() and strrchr() functions return a pointer to the matched
       character or NULL if the character is not found.  The terminating null
       byte is considered part of the string, so that if c is specified as
       '\0', these functions return a pointer to the terminator.

       The strchrnul() function returns a pointer to the matched character, or
       a pointer to the null byte at the end of s (i.e., s+strlen(s)) if the
       character is not found.

ATTRIBUTES
       For an explanation of the terms used in this section, see
       attributes(7).

       +--------------------------------------------+---------------+---------+
       |Interface                                   | Attribute     | Value   |
       +--------------------------------------------+---------------+---------+
       |strchr (), strrchr (), strchrnul ()         | Thread safety | MT-Safe |
       +--------------------------------------------+---------------+---------+
STANDARDS
       strchr()
       strrchr()
              C11, POSIX.1-2008.

       strchrnul()
              GNU.

HISTORY
       strchr()
       strrchr()
              POSIX.1-2001, C89, SVr4, 4.3BSD.

       strchrnul()
              glibc 2.1.1.

SEE ALSO
       memchr(3), string(3), strlen(3), strpbrk(3), strsep(3), strspn(3),
       strstr(3), strtok(3), wcschr(3), wcsrchr(3)

Linux man-pages 6.7               2023-10-31                         strchr(3)