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