Updated: 2022/Sep/29

Please read Privacy Policy. It's for your privacy.

INDEX(3)                   Library Functions Manual                   INDEX(3)

NAME
     index - locate character in string

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <strings.h>

     char *
     index(const char *s, int c);

DESCRIPTION
     The index() function locates the first character matching c (converted to
     a char) in the nul-terminated string s.

     This function is obsolete.  The equivalent function strchr(3) should be
     used instead.

RETURN VALUES
     A pointer to the character is returned if it is found; otherwise NULL is
     returned.  If c is '\0', index() locates the terminating '\0'.

SEE ALSO
     memchr(3), rindex(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3),
     strsep(3), strspn(3), strstr(3), strtok(3)

STANDARDS
     The index() function conforms to IEEE Std 1003.1-2001 ("POSIX.1").  The
     IEEE Std 1003.1-2004 ("POSIX.1") revision marked it as legacy and
     recommended the use of strchr(3) instead.  The IEEE Std 1003.1-2008
     ("POSIX.1") revision removed index() from the specification.

HISTORY
     An index() function appeared in Version 6 AT&T UNIX.

NetBSD 10.99                      May 5, 2012                     NetBSD 10.99