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Man Pages


Manual Reference Pages  -  INDEX (3)

NAME

index, rindex - locate character in string

CONTENTS

Library
Synopsis
Description
Return Values
See Also
History

LIBRARY


.Lb libc

SYNOPSIS


.In strings.h char * index const char *s int c char * rindex const char *s int c

DESCRIPTION


.Bf -symbolic The index and rindex functions have been deprecated in favor of strchr(3) and strrchr(3).
.Ef

The index function locates the first occurrence of c (converted to a
.Vt 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.

RETURN VALUES

The functions index and rindex return a pointer to the located character, 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 AT&T v6 . Their prototypes existed previously in
.In string.h before they were moved to
.In strings.h for -p1003.1-2001 compliance. The functions are not specified by -p1003.1-2008.
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