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INDEX(3) Library Functions Manual INDEX(3)

NAME

indexlocate 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This function is obsolete.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'.

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.
May 5, 2012 NetBSD 7.0