0,0 → 1,182 |
/* |
FUNCTION |
<<wcstok>>---get next token from a string |
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INDEX |
wcstok |
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ANSI_SYNOPSIS |
#include <wchar.h> |
wchar_t *wcstok(wchar_t *__restrict <[source]>, |
const wchar_t *__restrict <[delimiters]>, |
wchar_t **__restrict <[lasts]>); |
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TRAD_SYNOPSIS |
#include <wchar.h> |
wchar_t *wcstok(<[source]>, <[delimiters]>, <[lasts]>); |
wchar_t *__restrict <[source]>; |
wchar_t *__restrict <[delimiters]>; |
wchar_t **__restrict <[lasts]>; |
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DESCRIPTION |
The <<wcstok>> function is the wide-character equivalent of the |
<<strtok_r>> function (which in turn is the same as the <<strtok>> |
function with an added argument to make it thread-safe). |
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The <<wcstok>> function is used to isolate (one at a time) |
sequential tokens in a null-terminated wide-character string, |
<<*<[source]>>>. A token is defined as a substring not containing |
any wide-characters from <<*<[delimiters]>>>. |
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The first time that <<wcstok>> is called, <<*<[source]>>> should |
be specified with the wide-character string to be searched, and |
<<*<[lasts]>>>--but not <<lasts>>, which must be non-NULL--may be |
random; subsequent calls, wishing to obtain further tokens from |
the same string, should pass a null pointer for <<*<[source]>>> |
instead but must supply <<*<[lasts]>>> unchanged from the last |
call. The separator wide-character string, <<*<[delimiters]>>>, |
must be supplied each time and may change between calls. |
A pointer to placeholder <<*<[lasts]>>> must be supplied by |
the caller, and is set each time as needed to save the state |
by <<wcstok>>. Every call to <<wcstok>> with <<*<[source]>>> |
== <<NULL>> must pass the value of <<*<[lasts]>>> as last set |
by <<wcstok>>. |
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The <<wcstok>> function returns a pointer to the beginning of each |
subsequent token in the string, after replacing the separator |
wide-character itself with a null wide-character. When no more tokens |
remain, a null pointer is returned. |
|
RETURNS |
<<wcstok>> returns a pointer to the first wide character of a token, or |
<<NULL>> if there is no token. |
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NOTES |
<<wcstok>> is thread-safe (unlike <<strtok>>, but like <<strtok_r>>). |
<<wcstok>> writes into the string being searched. |
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PORTABILITY |
<<wcstok>> is C99 and POSIX.1-2001. |
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<<wcstok>> requires no supporting OS subroutines. |
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QUICKREF |
strtok ansi pure |
*/ |
/* wcstok for Newlib created by adapting strtok_r, 2008. */ |
/* |
* Copyright (c) 1988 Regents of the University of California. |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* 1. Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* 2. Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* 3. Neither the name of the University nor the names of its contributors |
* may be used to endorse or promote products derived from this software |
* without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
* SUCH DAMAGE. |
*/ |
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#include <wchar.h> |
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wchar_t * |
_DEFUN (wcstok, (s, delim, lasts), |
register wchar_t *__restrict s _AND |
register const wchar_t *__restrict delim _AND |
wchar_t **__restrict lasts) |
{ |
register const wchar_t *spanp; |
register int c, sc; |
wchar_t *tok; |
|
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if (s == NULL && (s = *lasts) == NULL) |
return (NULL); |
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/* |
* Skip (span) leading delimiters (s += wcsspn(s, delim), sort of). |
*/ |
cont: |
c = *s++; |
for (spanp = delim; (sc = *spanp++) != L'\0';) { |
if (c == sc) goto cont; |
} |
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if (c == L'\0') { /* no non-delimiter characters */ |
*lasts = NULL; |
return (NULL); |
} |
tok = s - 1; |
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/* |
* Scan token (scan for delimiters: s += wcscspn(s, delim), sort of). |
* Note that delim must have one NUL; we stop if we see that, too. |
*/ |
for (;;) { |
c = *s++; |
spanp = delim; |
do { |
if ((sc = *spanp++) == c) { |
if (c == L'\0') |
s = NULL; |
else |
s[-1] = L'\0'; |
*lasts = s; |
return (tok); |
} |
} while (sc != L'\0'); |
} |
/* NOTREACHED */ |
} |
|
/* The remainder of this file can serve as a regression test. Compile |
* with -D_REGRESSION_TEST. */ |
#if defined(_REGRESSION_TEST) /* [Test code: example from C99 standard */ |
#include <stdio.h> |
#include <wchar.h> |
|
/* example from C99 standard with minor additions to be a test */ |
int |
main(void) |
{ |
int errs=0; |
static wchar_t str1[] = L"?a???b,,,#c"; |
static wchar_t str2[] = L"\t \t"; |
wchar_t *t, *ptr1, *ptr2; |
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t = wcstok(str1, L"?", &ptr1); // t points to the token L"a" |
if(wcscmp(t,L"a")) errs++; |
t = wcstok(NULL, L",", &ptr1); // t points to the token L"??b" |
if(wcscmp(t,L"??b")) errs++; |
t = wcstok(str2, L" \t", &ptr2); // t is a null pointer |
if(t != NULL) errs++; |
t = wcstok(NULL, L"#,", &ptr1); // t points to the token L"c" |
if(wcscmp(t,L"c")) errs++; |
t = wcstok(NULL, L"?", &ptr1); // t is a null pointer |
if(t != NULL) errs++; |
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printf("wcstok() test "); |
if(errs) printf("FAILED %d test cases", errs); |
else printf("passed"); |
printf(".\n"); |
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return(errs); |
} |
#endif /* defined(_REGRESSION_TEST) ] */ |