str_left.c

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/* left$ function */

#include "fb.h"

FBCALL FBSTRING *fb_LEFT( FBSTRING *src, ssize_t chars )
{
        FBSTRING        *dst;
        ssize_t len, src_len;

        if( src == NULL )
                return &__fb_ctx.null_desc;

        FB_STRLOCK();

        src_len = FB_STRSIZE( src );
        if( (src->data != NULL) && (chars > 0) && (src_len > 0) )
        {
                if( chars > src_len )
                        len = src_len;
                else
                        len = chars;

                /* alloc temp string */
        dst = fb_hStrAllocTemp_NoLock( NULL, len );
                if( dst != NULL )
                {
                        /* simple copy */
                        fb_hStrCopy( dst->data, src->data, len );
                }
                else
                        dst = &__fb_ctx.null_desc;
    }
    else
        dst = &__fb_ctx.null_desc;

        /* del if temp */
        fb_hStrDelTemp_NoLock( src );

        FB_STRUNLOCK();

        return dst;
}