wcstombs()

Convert a wide-character string into a multibyte character string

Synopsis:

#include <stdlib.h>

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

Arguments:

s: A pointer to a buffer where the function can store the multibyte-character string.
pwcs: The wide-character string that you want to convert.
n: The maximum number of bytes to store.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

The wcstombs() function converts a sequence of wide character codes from the array pointed to by pwcs into a sequence of multibyte characters, and stores them in the array pointed to by s. It stops if a multibyte character exceeds the limit of n total bytes, or if the NUL character is stored. At most n bytes of the array pointed to by s are modified.

The wcsrtombs() function is a restartable version of wcstombs().

Returns:

The number of array elements modified, not including the terminating zero code, if present, or (size_t)-1 if an invalid multibyte character is encountered.

Examples:

#include <stdio.h>
#include <stdlib.h>

wchar_t wbuffer[] = {
    0x0073,
    0x0074,
    0x0072,
    0x0069,
    0x006e,
    0x0067,
    0x0000
  };

int main( void )
  {
    char    mbsbuffer[50];
    int     i, len;

    len = wcstombs( mbsbuffer, wbuffer, 50 );
    if( len != -1 ) {
      for( i = 0; i < len; i++ )
        printf( "/%4.4x", wbuffer[i] );
      printf( "\n" );
      mbsbuffer[len] = '\0';
      printf( "%s(%d)\n", mbsbuffer, len );
    }
    return EXIT_SUCCESS;
  }

produces the output:

/0073/0074/0072/0069/006e/0067
string(6)

Classification:

ANSI, POSIX 1003.1

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes