strchr(3)                  Library Functions Manual                  strchr(3)

NAME
       strchr, strrchr - 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);

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

              It is equivalent to both of the following expressions:

                  memchr(s, c, strlen(s) + 1)
                  strpbrk(s, (char [2]){c, '\0'})

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

              It is equivalent to

                  memrchr(s, c, strlen(s) + 1)

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.

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

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

HISTORY
       POSIX.1-2001, C89, SVr4, 4.3BSD.

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

Linux man-pages 6.18              2026-02-25                         strchr(3)