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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [string/] [wcstok.c] - Rev 214
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/* FUNCTION <<wcstok>>---get next token from a string INDEX wcstok ANSI_SYNOPSIS #include <wchar.h> wchar_t *wcstok(wchar_t *<[source]>, const wchar_t *<[delimiters]>, wchar_t **<[lasts]>) TRAD_SYNOPSIS #include <wchar.h> wchar_t *wcstok(<[source]>, <[delimiters]>, <[lasts]>) wchar_t *<[source]>; wchar_t *<[delimiters]>; wchar_t **<[lasts]>; 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). 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]>>>. 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>>. 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. NOTES <<wcstok>> is thread-safe (unlike <<strtok>>, but like <<strtok_r>>). <<wcstok>> writes into the string being searched. PORTABILITY <<wcstok>> is C99 and POSIX.1-2001. <<wcstok>> requires no supporting OS subroutines. 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. */ #include <wchar.h> wchar_t * _DEFUN (wcstok, (s, delim, lasts), register wchar_t *s _AND register const wchar_t *delim _AND wchar_t **lasts) { register const wchar_t *spanp; register int c, sc; wchar_t *tok; if (s == NULL && (s = *lasts) == NULL) return (NULL); /* * 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; } if (c == L'\0') { /* no non-delimiter characters */ *lasts = NULL; return (NULL); } tok = s - 1; /* * 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; 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++; printf("wcstok() test "); if(errs) printf("FAILED %d test cases", errs); else printf("passed"); printf(".\n"); return(errs); } #endif /* defined(_REGRESSION_TEST) ] */
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