INDEX(3) | Library Functions Manual | INDEX(3) |
index
, rindex
— locate character in string
Standard C Library (libc, -lc)
#include
<strings.h>
char *
index
(const
char *s, int
c);
char *
rindex
(const
char *s, int
c);
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 to be
part of the string; therefore, if c is
‘\0
’, the functions locate the
terminating ‘\0
’.
The
rindex
()
function is identical to index
(), except that it
locates the last occurrence of c.
The functions index
() and
rindex
() return a pointer to the located character,
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.
June 4, 1993 | macOS 14.6 |