Function pg_wcsformat

src/fe_utils/mbprint.c:293–383

* Format a string into one or more "struct lineptr" lines. * lines[i].ptr == NULL indicates the end of the array. * * This MUST be kept in sync with pg_wcssize! */

 * This MUST be kept in sync with pg_wcssize!
 */
void
pg_wcsformat(const unsigned char *pwcs, size_t len, int encoding,
			 struct lineptr *lines, int count)
{
	int			w,
				chlen = 0;
	int			linewidth = 0;
	unsigned char *ptr = lines->ptr;	/* Pointer to data area */

	for (; *pwcs && len > 0; pwcs += chlen)
	{
		chlen = PQmblen((const char *) pwcs, encoding);
		if (len < (size_t) chlen)
			break;
		w = PQdsplen((const char *) pwcs, encoding);

		if (chlen == 1)			/* single-byte char */
		{
			if (*pwcs == '\n')	/* Newline */
			{
				*ptr++ = '\0';
				lines->width = linewidth;
				linewidth = 0;
				lines++;
				count--;
				if (count <= 0)
					exit(1);	/* Screwup */

				/* make next line point to remaining memory */
				lines->ptr = ptr;
			}
			else if (*pwcs == '\r') /* Linefeed */
			{
				strcpy((char *) ptr, "\\r");
				linewidth += 2;
				ptr += 2;
			}
			else if (*pwcs == '\t') /* Tab */
			{
				do
				{
					*ptr++ = ' ';
					linewidth++;
				} while (linewidth % 8 != 0);
			}
			else if (w < 0)		/* Other control char */
			{
				sprintf((char *) ptr, "\\x%02X", *pwcs);
				linewidth += 4;
				ptr += 4;
			}
			else				/* Output it as-is */
			{
				linewidth += w;
				*ptr++ = *pwcs;
			}
		}
		else if (w < 0)			/* Non-ascii control char */