index(3) BSD Library Functions Manual index(3)
NAME
index, rindex -- locate character in string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <strings.h>
char *
index(const char *s, int c);
char *
rindex(const char *s, int c);
DESCRIPTION
The index() function locates the first occurrence of c (converted to a
char) in the string pointed to by s. The terminating null character is
considered to be part of the string; therefore, if c is `\0', the func-
tions locate the terminating `\0'.
The rindex() function is identical to index(), except that it locates the
last occurrence of c.
RETURN VALUES
The functions index() and rindex() return a pointer to the located char-
acter, or NULL if the character does not appear in the string.
SEE ALSO
memchr(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3),
strspn(3), strstr(3), strtok(3)
HISTORY
The index() and rindex() functions appeared in Version 6 AT&T UNIX.
Their prototypes existed previously in <string.h> before they were moved
to <strings.h> for IEEE Std 1003.1-2001 (``POSIX.1'') compliance.
BSD June 4, 1993 BSD
Mac OS X 10.8 - Generated Tue Aug 28 05:49:43 CDT 2012