str_tempres.c

Go to the documentation of this file.

/* temp result string allocation */

#include "fb.h"

/*:::::*/
FBCALL FBSTRING *fb_StrAllocTempResult ( FBSTRING *src )
{
        FBSTRING *dsc;

        FB_STRLOCK();
        
        /* alloc a temporary descriptor (the current one at stack will be trashed) */
        dsc = fb_hStrAllocTmpDesc( );
    if( dsc == NULL ) {
        FB_STRUNLOCK();
        return &__fb_ctx.null_desc;
    }

    /* copy just the descriptor, setting it as a temp string */
    dsc->data = src->data;
    dsc->len  = src->len | FB_TEMPSTRBIT;
    dsc->size = src->size;

        /* just for safety.. */
        src->data = NULL;
        src->len  = 0;
        src->size = 0;

        FB_STRUNLOCK();

        return dsc;
}