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INDEX(3) Library Functions Manual INDEX(3) NAME index - locate 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function locates the first character matching c (converted to a char) in the nul-terminated string s. This function is obsolete.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'. 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. NetBSD 9.99 May 5, 2012 NetBSD 9.99