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WCSTOMBS(3) BSD Library Functions Manual WCSTOMBS(3)
wcstombs -- converts a wide-character string to a multibyte character string
Standard C Library (libc, -lc)
wcstombs(char * restrict s, const wchar_t * restrict pwcs, size_t n);
wcstombs() converts the nul-terminated wide-character string pointed to by pwcs to the cor-
responding multibyte character string, and stores it in the array pointed to by s. This
function may modify the first at most n bytes of the array pointed to by s. Each character
will be converted as if wctomb(3) is continuously called, except the internal state of
wctomb(3) will not be affected.
For state-dependent encoding, the wcstombs() implies the result multibyte character string
pointed to by s always to begin with an initial state.
The behaviour of wcstombs() is affected by the LC_CTYPE category of the current locale.
These are the special cases:
s == NULL The wcstombs() returns the number of bytes to store the whole multibyte char-
acter string corresponding to the wide-character string pointed to by pwcs.
In this case, n is ignored.
pwcs == NULL Undefined (may cause the program to crash).
0 or positive
Number of bytes stored in the array pointed to by s. There are no cases that
the value returned is greater than n (unless s is a null pointer). If the
return value is equal to n, the string pointed to by s will not be nul-termi-
(size_t)-1 pwcs points to a string containing an invalid wide character. wcstombs() also
sets errno to indicate the error.
wcstombs() may cause an error in the following case:
[EILSEQ] pwcs points to a string containing an invalid wide character.
mbstowcs(3), setlocale(3), wctomb(3)
The wcstombs() function conforms to ANSI X3.159-1989 (``ANSI C89''). The restrict qualifier
is added at ISO/IEC 9899:1999 (``ISO C99'').
BSD March 16, 2011 BSD
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