75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
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/***
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*wcsspn.c - find length of initial substring of chars from a control string
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* (wide-character strings)
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines wcsspn() - finds the length of the initial substring of
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* a string consisting entirely of characters from a control string
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* (wide-character strings).
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*
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*Revision History:
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* 11-04-91 ETC Created with source from crtdll.
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* 04-07-92 KRS Updated and ripped out _INTL switches.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 02-07-94 CFW POSIXify.
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* 02-27-98 RKP Added 64 bit support.
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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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/***
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*int wcsspn(string, control) - find init substring of control chars
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*
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*Purpose:
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* Finds the index of the first character in string that does belong
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* to the set of characters specified by control. This is
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* equivalent to the length of the initial substring of string that
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* consists entirely of characters from control. The L'\0' character
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* that terminates control is not considered in the matching process
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* (wide-character strings).
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*
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*Entry:
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* wchar_t *string - string to search
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* wchar_t *control - string containing characters not to search for
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*
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*Exit:
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* returns index of first wchar_t in string not in control
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*
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*Exceptions:
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*
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*******************************************************************************/
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size_t __cdecl wcsspn (
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const 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 *str = (wchar_t *) string;
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wchar_t *ctl;
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/* 1st char not in control string stops search */
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while (*str) {
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for (ctl = (wchar_t *)control; *ctl != *str; ctl++) {
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if (*ctl == (wchar_t)0) {
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/*
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* reached end of control string without finding a match
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*/
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return (size_t)(str - string);
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}
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}
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str++;
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}
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/*
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* The whole string consisted of characters from control
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*/
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return (size_t)(str - string);
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}
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#endif /* _POSIX_ */
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