INDEX(3) Linux Programmer's Manual INDEX(3)
NAME
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 at-
tributes(7).
┌──────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────┼───────────────┼─────────┤
│index(), rindex() │ Thread safety │ MT-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 str-
rchr(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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description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2019-03-06 INDEX(3)
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