NAME
index —
locate character in string
LIBRARY
library “libc”
SYNOPSIS
#include
<strings.h>
char *
index(const
char *s, int
c);
DESCRIPTION
Theindex()
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This function is obsolete.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.