106 lines
3.2 KiB
C
106 lines
3.2 KiB
C
/*
|
|
FUNCTION
|
|
<<strtok>>, <<strtok_r>>, <<strsep>>---get next token from a string
|
|
|
|
INDEX
|
|
strtok
|
|
|
|
INDEX
|
|
strtok_r
|
|
|
|
INDEX
|
|
strsep
|
|
|
|
ANSI_SYNOPSIS
|
|
#include <string.h>
|
|
char *strtok(char *restrict <[source]>,
|
|
const char *restrict <[delimiters]>)
|
|
char *strtok_r(char *restrict <[source]>,
|
|
const char *restrict <[delimiters]>,
|
|
char **<[lasts]>)
|
|
char *strsep(char **<[source_ptr]>, const char *<[delimiters]>)
|
|
|
|
TRAD_SYNOPSIS
|
|
#include <string.h>
|
|
char *strtok(<[source]>, <[delimiters]>)
|
|
char *<[source]>;
|
|
char *<[delimiters]>;
|
|
|
|
char *strtok_r(<[source]>, <[delimiters]>, <[lasts]>)
|
|
char *<[source]>;
|
|
char *<[delimiters]>;
|
|
char **<[lasts]>;
|
|
|
|
char *strsep(<[source_ptr]>, <[delimiters]>)
|
|
char **<[source_ptr]>;
|
|
char *<[delimiters]>;
|
|
|
|
DESCRIPTION
|
|
The <<strtok>> function is used to isolate sequential tokens in a
|
|
null-terminated string, <<*<[source]>>>. These tokens are delimited
|
|
in the string by at least one of the characters in <<*<[delimiters]>>>.
|
|
The first time that <<strtok>> is called, <<*<[source]>>> should be
|
|
specified; subsequent calls, wishing to obtain further tokens from
|
|
the same string, should pass a null pointer instead. The separator
|
|
string, <<*<[delimiters]>>>, must be supplied each time and may
|
|
change between calls.
|
|
|
|
The <<strtok>> function returns a pointer to the beginning of each
|
|
subsequent token in the string, after replacing the separator
|
|
character itself with a null character. When no more tokens remain,
|
|
a null pointer is returned.
|
|
|
|
The <<strtok_r>> function has the same behavior as <<strtok>>, except
|
|
a pointer to placeholder <<*<[lasts]>>> must be supplied by the caller.
|
|
|
|
The <<strsep>> function is similar in behavior to <<strtok>>, except
|
|
a pointer to the string pointer must be supplied <<<[source_ptr]>>> and
|
|
the function does not skip leading delimiters. When the string starts
|
|
with a delimiter, the delimiter is changed to the null character and
|
|
the empty string is returned. Like <<strtok_r>> and <<strtok>>, the
|
|
<<*<[source_ptr]>>> is updated to the next character following the
|
|
last delimiter found or NULL if the end of string is reached with
|
|
no more delimiters.
|
|
|
|
RETURNS
|
|
<<strtok>>, <<strtok_r>>, and <<strsep>> all return a pointer to the
|
|
next token, or <<NULL>> if no more tokens can be found. For
|
|
<<strsep>>, a token may be the empty string.
|
|
|
|
NOTES
|
|
<<strtok>> is unsafe for multi-threaded applications. <<strtok_r>>
|
|
and <<strsep>> are thread-safe and should be used instead.
|
|
|
|
PORTABILITY
|
|
<<strtok>> is ANSI C.
|
|
<<strtok_r>> is POSIX.
|
|
<<strsep>> is a BSD extension.
|
|
|
|
<<strtok>>, <<strtok_r>>, and <<strsep>> require no supporting OS subroutines.
|
|
|
|
QUICKREF
|
|
strtok ansi impure
|
|
*/
|
|
|
|
/* undef STRICT_ANSI so that strtok_r prototype will be defined */
|
|
#undef __STRICT_ANSI__
|
|
#include <string.h>
|
|
#include <_ansi.h>
|
|
#include <reent.h>
|
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
extern char *__strtok_r (char *, const char *, char **, int);
|
|
|
|
char *
|
|
_DEFUN (strtok, (s, delim),
|
|
register char *__restrict s _AND
|
|
register const char *__restrict delim)
|
|
{
|
|
struct _reent *reent = _REENT;
|
|
|
|
_REENT_CHECK_MISC(reent);
|
|
return __strtok_r (s, delim, &(_REENT_STRTOK_LAST(reent)), 1);
|
|
}
|
|
#endif
|