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INDEX(3) DragonFly Library Functions Manual INDEX(3)
index, rindex -- locate character in string
Standard C Library (libc, -lc)
index(const char *s, int c);
rindex(const char *s, int c);
The index() and rindex() functions have been deprecated in favor of
strchr(3) and strrchr(3).
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 part of the string; therefore if c is `\0', the functions
locate the terminating `\0'.
The rindex() function is identical to index(), except it locates the last
occurrence of c.
The functions index() and rindex() return a pointer to the located char-
acter, or NULL if the character does not appear in the string.
memchr(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3),
strspn(3), strstr(3), strtok(3)
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. The
functions are not specified by IEEE Std 1003.1-2008 (``POSIX.1'').
DragonFly 3.7 March 20, 2011 DragonFly 3.7