strchr(3) — Linux manual page

strchr(3)                Library Functions Manual               strchr(3)

NAME         top

       strchr, strrchr, strchrnul - locate character in string

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #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         top

       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         top

       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         top

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                            │ Attribute     │ Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │ strchr(), strrchr(), strchrnul()     │ Thread safety │ MT-Safe │
       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS         top

       strchr()
       strrchr()
              C11, POSIX.1-2008.

       strchrnul()
              GNU.

HISTORY         top

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

       strchrnul()
              glibc 2.1.1, FreeBSD 10, NetBSD 8.

SEE ALSO         top

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

COLOPHON         top

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Linux man-pages 6.15            2025-05-17                      strchr(3)

Pages that refer to this page: index(3),  memchr(3),  string(3),  strpbrk(3),  strsep(3),  strspn(3),  strstr(3),  strtok(3),  wcschr(3),  wcsrchr(3),  signal-safety(7)

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