strchr(3) — Linux manual page

strchr(3)                Library Functions Manual               strchr(3)

NAME         top

       strchr, strrchr - 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);

DESCRIPTION         top

       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         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.

ATTRIBUTES         top

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

STANDARDS         top

       C11, POSIX.1-2008.

HISTORY         top

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

SEE ALSO         top

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

COLOPHON         top

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

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

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