136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
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/***
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*wcstok.c - tokenize a wide-character string with given delimiters
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*
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* Copyright (c) 1989-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines wcstok() - breaks wide-character string into series of token
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* via repeated calls.
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*
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*Revision History:
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* 09-09-91 ETC Created from strtok.c.
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* 08-17-92 KRS Activate multithread support.
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* 02-17-93 GJF Changed for new _getptd().
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 09-27-93 CFW Remove Cruiser support.
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* 09-29-93 GJF Replaced MTHREAD with _MT.
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* 02-07-94 CFW POSIXify.
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* 09-06-94 CFW Replace MTHREAD with _MT (again).
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*
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*******************************************************************************/
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#ifndef _POSIX_
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#include <cruntime.h>
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#include <string.h>
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#ifdef _MT
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#include <mtdll.h>
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#endif
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/***
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*wchar_t *wcstok(string, control) - tokenize string with delimiter in control
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* (wide-characters)
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*
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*Purpose:
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* wcstok considers the string to consist of a sequence of zero or more
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* text tokens separated by spans of one or more control chars. the first
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* call, with string specified, returns a pointer to the first wchar_t of
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* the first token, and will write a null wchar_t into string immediately
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* following the returned token. subsequent calls with zero for the first
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* argument (string) will work thru the string until no tokens remain. the
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* control string may be different from call to call. when no tokens remain
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* in string a NULL pointer is returned. remember the control chars with a
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* bit map, one bit per wchar_t. the null wchar_t is always a control char
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* (wide-characters).
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*
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*Entry:
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* wchar_t *string - wchar_t string to tokenize, or NULL to get next token
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* wchar_t *control - wchar_t string of characters to use as delimiters
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*
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*Exit:
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* returns pointer to first token in string, or if string
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* was NULL, to next token
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* returns NULL when no more tokens remain.
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*
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*Uses:
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*
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*Exceptions:
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*
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*******************************************************************************/
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wchar_t * __cdecl wcstok (
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wchar_t * string,
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const wchar_t * control
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)
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{
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wchar_t *token;
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const wchar_t *ctl;
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#ifdef _MT
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_ptiddata ptd = _getptd();
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#else
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static wchar_t *nextoken;
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#endif
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/* If string==NULL, continue with previous string */
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if (!string)
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#ifdef _MT
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string = ptd->_wtoken;
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#else
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string = nextoken;
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#endif
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/* Find beginning of token (skip over leading delimiters). Note that
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* there is no token iff this loop sets string to point to the terminal
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* null (*string == '\0') */
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while (*string) {
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for (ctl=control; *ctl && *ctl != *string; ctl++)
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;
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if (!*ctl) break;
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string++;
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}
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token = string;
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/* Find the end of the token. If it is not the end of the string,
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* put a null there. */
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for ( ; *string ; string++ ) {
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for (ctl=control; *ctl && *ctl != *string; ctl++)
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;
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if (*ctl) {
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*string++ = '\0';
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break;
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}
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}
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/* Update nextoken (or the corresponding field in the per-thread data
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* structure */
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#ifdef _MT
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ptd->_wtoken = string;
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#else
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nextoken = string;
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#endif
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/* Determine if a token has been found. */
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if ( token == string )
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return NULL;
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else
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return token;
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}
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#endif /* _POSIX_ */
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