53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
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/* Copyright 1989 Manx Software Systems, Inc. All rights reserved */
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/*
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* Synopsis
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*
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* int mbtowc(wchar_t *pwc, const char *s, size_t n);
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*
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*
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* Description
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*
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* If s is not a null pointer, the mbtowc function determines the number
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* of bytes that comprise the multibyte character pointed to by s. It then
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* determines the code for value of type wchar_t that corresponds to that
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* multibyte character. (The value of the code corresponding to the null
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* character is zero.) If the multibyte character is valid and pwc is not a
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* null pointer, the mbtowc function stores the code in the object pointed to
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* by pwc. At most n bytes of the array pointed to by s will be examined.
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*
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* The implementation shall behave as if no library function calls the
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* mbtowc function.
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*
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*
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* Returns
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*
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* If s is a null pointer, the mbtowc function returns a nonzero or zero
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* value, if multibyte character encodings, respectively, do or do not have
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* state-dependent encodings. If s is not a null pointer, the mbtowc function
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* either returns zero (if s points to the null character), or returns the
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* number of bytes that comprise the converted multibyte character (if the
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* next n or fewer bytes form a valid multibyte character), or returns minus
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* one (if they do not form a valid multibyte character).
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*
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* In no case will the value returned be greater than n or the value of
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* the MB_CUR_MAX macro.
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*/
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#include <stdlib.h>
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int mbtowc(wchar_t *pwc, const char *s, size_t n)
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{
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if (s == 0)
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return(0);
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if (n >= 1) {
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if (pwc != 0)
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*pwc = *s;
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if (*s == 0)
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return(0);
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return(1);
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}
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return(-1);
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}
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