lwmessage_truncate()

char* lwmessage_truncate	(	char *	str,
		int	startpos,
		int	endpos,
		int	maxlength,
		int	truncdirection
	)

Definition at line 294 of file lwutil.c.

References lwalloc().

Referenced by errorIfGeometryCollection().

{
        char *output;
        char *outstart;

        /* Allocate space for new string */
        output = lwalloc(maxlength + 4);
        output[0] = '\0';

        /* Start truncation */
        if (truncdirection == 0)
        {
                /* Calculate the start position */
                if (endpos - startpos < maxlength)
                {
                        outstart = str + startpos;
                        strncat(output, outstart, endpos - startpos + 1);
                }
                else
                {
                        if (maxlength >= 3)
                        {
                                /* Add "..." prefix */
                                outstart = str + endpos + 1 - maxlength + 3;
                                strncat(output, "...", 3);
                                strncat(output, outstart, maxlength - 3);
                        }
                        else
                        {
                                /* maxlength is too small; just output "..." */
                                strncat(output, "...", 3);
                        }
                }
        }

        /* End truncation */
        if (truncdirection == 1)
        {
                /* Calculate the end position */
                if (endpos - startpos < maxlength)
                {
                        outstart = str + startpos;
                        strncat(output, outstart, endpos - startpos + 1);
                }
                else
                {
                        if (maxlength >= 3)
                        {
                                /* Add "..." suffix */
                                outstart = str + startpos;
                                strncat(output, outstart, maxlength - 3);
                                strncat(output, "...", 3);
                        }
                        else
                        {
                                /* maxlength is too small; just output "..." */
                                strncat(output, "...", 3);
                        }
                }
        }

        return output;
}

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