str_convto_flt.c

Go to the documentation of this file.

/* str$ routines for float and double
 *
 * the result string's len is being "faked" to appear as if it were shorter
 * than the one that has to be allocated to fit _itoa and _gvct buffers.
 */

#include "fb.h"


/*:::::*/
FBCALL FBSTRING *fb_FloatToStr ( float num )
{
        FBSTRING        *dst;

        /* alloc temp string */
        dst = fb_hStrAllocTemp( NULL, 7+8 );
        if( dst != NULL )
        {
                size_t tmp_len;

                /* convert */
                sprintf( dst->data, "%.7g", num );

                tmp_len = strlen( dst->data );                          /* fake len */

                /* skip the dot at end if any */
                if( tmp_len > 0 )
                {
                        if( dst->data[tmp_len-1] == '.' )
                        {
                                dst->data[tmp_len-1] = '\0';
                                --tmp_len;
                        }
                }
                fb_hStrSetLength( dst, tmp_len );
        }
        else
                dst = &__fb_ctx.null_desc;

        return dst;
}

/*:::::*/
FBCALL FBSTRING *fb_DoubleToStr ( double num )
{
        FBSTRING        *dst;

        /* alloc temp string */
        dst = fb_hStrAllocTemp( NULL, 16+8 );
        if( dst != NULL )
        {
                size_t tmp_len;

                /* convert */
                sprintf( dst->data, "%.16g", num );

                tmp_len = strlen( dst->data );                          /* fake len */

                /* skip the dot at end if any */
                if( tmp_len > 0 )
                {
                        if( dst->data[tmp_len-1] == '.' )
                        {
                                dst->data[tmp_len-1] = '\0';
                                --tmp_len;
                        }
                }
                fb_hStrSetLength( dst, tmp_len );
        }
        else
                dst = &__fb_ctx.null_desc;

        return dst;
}