STRCHR(3)

STRCHR(3)                  Linux Programmer's Manual                 STRCHR(3)

NAME
       strchr, strrchr, strchrnul - locate character in string

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.

VERSIONS
       strchrnul() first appeared in glibc in version 2.1.1.

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

       +---------------------------------+---------------+---------+
       |Interface                        | Attribute     | Value   |
       +---------------------------------+---------------+---------+
       |strchr(), strrchr(), strchrnul() | Thread safety | MT-Safe |
       +---------------------------------+---------------+---------+
CONFORMING TO
       strchr(),  strrchr():  POSIX.1-2001,  POSIX.1-2008,  C89,  C99,   SVr4,
       4.3BSD.

       strchrnul() is a GNU extension.

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

COLOPHON
       This page is part of release 5.07 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.

GNU                               2019-03-06                         STRCHR(3)