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RedHat 9 (Linux i386) - man page for wcstombs (redhat section 3)

WCSTOMBS(3)			    Linux Programmer's Manual			      WCSTOMBS(3)

       wcstombs - convert a wide character string to a multibyte string

       #include <stdlib.h>

       size_t wcstombs(char *dest, const wchar_t *src, size_t n);

       If  dest  is  not a NULL pointer, the wcstombs function converts the wide-character string
       src to a multibyte string starting at dest. At most n bytes are written to dest. The  con-
       version starts in the initial state. The conversion can stop for three reasons:

       1.  A  wide  character  has  been  encountered  that can not be represented as a multibyte
       sequence (according to the current locale). In this case (size_t)(-1) is returned.

       2. The length limit forces a stop. In this case the number of bytes  written  to  dest  is
       returned, but the shift state at this point is lost.

       3.  The	wide-character	string	has  been completely converted, including the terminating
       L'\0'. In this case the conversion ends in the initial state.  The number of bytes written
       to dest, excluding the terminating '\0' byte, is returned.

       The programmer must ensure that there is room for at least n bytes at dest.

       If  dest is NULL, n is ignored, and the conversion proceeds as above, except that the con-
       verted bytes are not written out to memory, and that no length limit exists.

       In order to avoid the case 2 above, the programmer should make sure n is greater or  equal
       to wcstombs(NULL,src,0)+1.

       The  wcstombs  function	returns  the  number  of bytes that make up the converted part of
       multibyte sequence, not including the terminating null byte.   If  a  wide  character  was
       encountered which could not be converted, (size_t)(-1) is returned.

       ISO/ANSI C, UNIX98


       The behaviour of wcstombs depends on the LC_CTYPE category of the current locale.

       The function wcsrtombs provides a thread safe interface to the same functionality.

GNU					    1999-07-25				      WCSTOMBS(3)

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