index man page

index, rindex — locate character in string

Synopsis

#include <strings.h>

char *index(const char *s, int c);

char *rindex(const char *s, int c);

Description

The index() function returns a pointer to the first occurrence of the character c in the string s.

The rindex() function returns a pointer to the last occurrence of the character c in the string s.

The terminating null byte ('\0') is considered to be a part of the strings.

Return Value

The index() and rindex() functions return a pointer to the matched character or NULL if the character is not found.

Attributes

For an explanation of the terms used in this section, see attributes(7).

InterfaceAttributeValue
index(), rindex()Thread safetyMT-Safe

Conforming to

4.3BSD; marked as LEGACY in POSIX.1-2001. POSIX.1-2008 removes the specifications of index() and rindex(), recommending strchr(3) and strrchr(3) instead.

See Also

memchr(3), strchr(3), string(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3)

Colophon

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Referenced By

memchr(3), strchr(3), string(3), strpbrk(3), strsep(3), strspn(3), strstr(3), strtok(3).

rindex(3) is an alias of index(3).

2015-03-02 GNU Linux Programmer's Manual