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.
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
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.