INDEX(3) BSD Library Functions Manual INDEX(3)NAME
index -- locate character in string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <strings.h>
char *
index(const char *s, int c);
DESCRIPTION
The index() function locates the first character matching c (converted to a char) in the nul-terminated string s.
RETURN VALUES
A pointer to the character is returned if it is found; otherwise NULL is returned. If c is ' ', index() locates the terminating ' '.
SEE ALSO memchr(3), rindex(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3)STANDARDS
The index() function conforms to IEEE Std 1003.1-2001 (``POSIX.1''). The IEEE Std 1003.1-2004 (``POSIX.1'') revision marked it as legacy and
recommended the use of strchr(3) instead. The IEEE Std 1003.1-2008 (``POSIX.1'') revision removed index() from the specification.
HISTORY
An index() function appeared in Version 6 AT&T UNIX.
BSD April 29, 2010 BSD
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INDEX(3) BSD Library Functions Manual INDEX(3)NAME
index, rindex -- locate character in string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <strings.h>
char *
index(const char *s, int c);
char *
rindex(const char *s, int c);
DESCRIPTION
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 ' ', the functions locate the terminating ' '.
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 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'').
BSD March 20, 2011 BSD
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