strchr(3) - Man pages

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, FreeBSD 10, NetBSD 8.

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 6.9.1              2024-06-15                         strchr(3)

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