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from: @(#)index.3 8.1 (Berkeley) 6/4/93
$NetBSD: index.3,v 1.15 2012/05/05 21:18:43 dholland Exp $
.Dd May 5, 2012 .Dt INDEX 3 .Os .Sh NAME .Nm index .Nd locate character in string .Sh LIBRARY .Lb libc .Sh SYNOPSIS n strings.h .Ft char * .Fn index "const char *s" "int c" .Sh DESCRIPTION The .Fn index function locates the first character matching .Fa c (converted to a .Em char ) in the nul-terminated string .Fa s .
p This function is obsolete. The equivalent function .Xr strchr 3 should be used instead. .Sh RETURN VALUES A pointer to the character is returned if it is found; otherwise .Dv NULL is returned. If .Fa c is '\e0', .Fn index locates the terminating '\e0'. .Sh SEE ALSO .Xr memchr 3 , .Xr rindex 3 , .Xr strchr 3 , .Xr strcspn 3 , .Xr strpbrk 3 , .Xr strrchr 3 , .Xr strsep 3 , .Xr strspn 3 , .Xr strstr 3 , .Xr strtok 3 .Sh STANDARDS The .Fn index function conforms to .St -p1003.1-2001 . The .St -p1003.1-2004 revision marked it as legacy and recommended the use of .Xr strchr 3 instead. The .St -p1003.1-2008 revision removed .Fn index from the specification. .Sh HISTORY An .Fn index function appeared in .At v6 .
Indexes created Sat Sep 20 22:09:52 GMT 2025