dev_file_read_wstr.c

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/* file device */

#include "fb.h"

int fb_DevFileReadWstr( FB_FILE *handle, FB_WCHAR *dst, size_t *pchars )
{
    FILE *fp;
    size_t chars;
    char *buffer;

    FB_LOCK();

    if( handle == NULL )
        fp = stdin;
    else
    {
        fp = (FILE*) handle->opaque;
        if( fp == stdout || fp == stderr )
                fp = stdin;

                if( fp == NULL )
                {
                        FB_UNLOCK();
                        return fb_ErrorSetNum( FB_RTERROR_ILLEGALFUNCTIONCALL );
                }
        }

    chars = *pchars;

        if( chars < FB_LOCALBUFF_MAXLEN )
                buffer = alloca( chars + 1 );
        else
                buffer = malloc( chars + 1 );

        /* do read */
        chars = fread( buffer, 1, chars, fp );
        buffer[chars] = '\0';

        /* convert to wchar, file should be opened with the ENCODING option
           to allow UTF characters to be read */
        fb_wstr_ConvFromA( dst, chars, buffer );

        if( *pchars >= FB_LOCALBUFF_MAXLEN )
                free( buffer );

        /* fill with nulls if at eof */
        if( chars != *pchars )
        memset( (void *)&dst[chars], 0, (*pchars - chars) * sizeof( FB_WCHAR ) );

    *pchars = chars;

        FB_UNLOCK();

        return fb_ErrorSetNum( FB_RTERROR_OK );
}