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NetBSD 6.1.5 - man page for wcstombs (netbsd section 3)

WCSTOMBS(3)			   BSD Library Functions Manual 		      WCSTOMBS(3)

NAME
     wcstombs -- converts a wide-character string to a multibyte character string

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <stdlib.h>

     size_t
     wcstombs(char * restrict s, const wchar_t * restrict pwcs, size_t n);

DESCRIPTION
     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).

RETURN VALUES
     wcstombs() returns:

     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-
		   nated.

     (size_t)-1    pwcs points to a string containing an invalid wide character.  wcstombs() also
		   sets errno to indicate the error.

ERRORS
     wcstombs() may cause an error in the following case:

     [EILSEQ]		pwcs points to a string containing an invalid wide character.

SEE ALSO
     mbstowcs(3), setlocale(3), wctomb(3)

STANDARDS
     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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