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/*

 * Copyright (c) 1980 Regents of the University of California.

 * All rights reserved.  The Berkeley software License Agreement

 * specifies the terms and conditions for redistribution.

 */

#if	!defined(lint) && defined(DOSCCS)

static char *sccsid = "@(#)ex_addr.c	7.3 (Berkeley) 6/7/85";

#endif not lint

#include "ex.h"

#include "ex_re.h"

/*

 * Routines for address parsing and assignment and checking of address bounds

 * in command mode.  The routine address is called from ex_cmds.c

 * to parse each component of a command (terminated by , ; or the beginning

 * of the command itself.  It is also called by the scanning routine

 * in ex_voperate.c from within open/visual.

 *

 * Other routines here manipulate the externals addr1 and addr2.

 * These are the first and last lines for the current command.

 *

 * The variable bigmove remembers whether a non-local glitch of . was

 * involved in an address expression, so we can set the previous context

 * mark '' when such a motion occurs.

 */

static	bool bigmove;

/*

 * Set up addr1 and addr2 for commands whose default address is dot.

 */

setdot()

{

	setdot1();

	if (bigmove)

		markDOT();

}

/*

 * Call setdot1 to set up default addresses without ever

 * setting the previous context mark.

 */

setdot1()

{

	if (addr2 == 0)

		addr1 = addr2 = dot;

	if (addr1 > addr2) {

		notempty();

		error("Addr1 > addr2|First address exceeds second");

	}

}

/*

 * Ex allows you to say

 *	delete 5

 * to delete 5 lines, etc.

 * Such nonsense is implemented by setcount.

 */

void

setcount()

{

	register int cnt;

	pastwh();

	if (!isdigit(peekchar())) {

		setdot();

		return;

	}

	addr1 = addr2;

	setdot();

	cnt = getnum();

	if (cnt <= 0)

		error("Bad count|Nonzero count required");

	addr2 += cnt - 1;

	if (addr2 > dol)

		addr2 = dol;

	nonzero();

}

/*

 * Parse a number out of the command input stream.

 */

getnum()

{

	register int cnt;

	for (cnt = 0; isdigit(peekcd());)

		cnt = cnt * 10 + getchar() - '0';

	return (cnt);

}

/*

 * Set the default addresses for commands which use the whole

 * buffer as default, notably write.

 */

void

setall()

{

	if (addr2 == 0) {

		addr1 = one;

		addr2 = dol;

		if (dol == zero) {

			dot = zero;

			return;

		}

	}

	/*

	 * Don't want to set previous context mark so use setdot1().

	 */

	setdot1();

}

/*

 * No address allowed on, e.g. the file command.

 */

setnoaddr()

{

	if (addr2 != 0)

		error("No address allowed@on this command");

}

/*

 * Parse an address.

 * Just about any sequence of address characters is legal.

 *

 * If you are tricky you can use this routine and the = command

 * to do simple addition and subtraction of cardinals less

 * than the number of lines in the file.

 */

line *

address(in_line)

	char *in_line;

{

	register line *addr;

	register int offset, c;

	short lastsign;

	bigmove = 0;

	lastsign = 0;

	offset = 0;

	addr = 0;

	for (;;) {

		if (isdigit(peekcd())) {

			if (addr == 0) {

				addr = zero;

				bigmove = 1;

			}

			loc1 = 0;

			addr += offset;

			offset = getnum();

			if (lastsign >= 0)

				addr += offset;

			else

				addr -= offset;

			lastsign = 0;

			offset = 0;

		}

		switch (c = getcd()) {

		case '?':

		case '/':

		case '$':

		case '\'':

		case '\\':

			bigmove++;

		case '.':

			if (addr || offset)

				error("Badly formed address");

		}

		offset += lastsign;

		lastsign = 0;

		switch (c) {

		case ' ':

		case '\t':

			continue;

		case '+':

			lastsign = 1;

			if (addr == 0)

				addr = dot;

			continue;

		case '^':

		case '-':

			lastsign = -1;

			if (addr == 0)

				addr = dot;

			continue;

		case '\\':

		case '?':

		case '/':

			c = compile(c, 1);

			notempty();

			savere(scanre);

			addr = dot;

			if (in_line && execute(0, dot)) {

				if (c == '/') {

					while (loc1 <= in_line) {

						if (loc1 == loc2)

							loc2++;

						if (!execute(1))

							goto nope;

					}

					break;

				} else if (loc1 < in_line) {

					char *last;

doques:

					do {

						last = loc1;

						if (loc1 == loc2)

							loc2++;

						if (!execute(1))

							break;

					} while (loc1 < in_line);

					loc1 = last;

					break;

				}

			}

nope:

			for (;;) {

				if (c == '/') {

					addr++;

					if (addr > dol) {

						if (value(WRAPSCAN) == 0)

error("No match to BOTTOM|Address search hit BOTTOM without matching pattern");

						addr = zero;

					}

				} else {

					addr--;

					if (addr < zero) {

						if (value(WRAPSCAN) == 0)

error("No match to TOP|Address search hit TOP without matching pattern");

						addr = dol;

					}

				}

				if (execute(0, addr)) {

					if (in_line && c == '?') {

						in_line = &linebuf[LBSIZE];

						goto doques;

					}

					break;

				}

				if (addr == dot)

					error("Fail|Pattern not found");

			}

			continue;

		case '$':

			addr = dol;

			continue;

		case '.':

			addr = dot;

			continue;

		case '\'':

			c = markreg(getchar());

			if (c == 0)

				error("Marks are ' and a-z");

			addr = getmark(c);

			if (addr == 0)

				error("Undefined mark@referenced");

			break;

		default:

			ungetchar(c);

			if (offset) {

				if (addr == 0)

					addr = dot;

				addr += offset;

				loc1 = 0;

			}

			if (addr == 0) {

				bigmove = 0;

				return (0);

			}

			if (addr != zero)

				notempty();

			addr += lastsign;

			if (addr < zero)

				error("Negative address@- first buffer line is 1");

			if (addr > dol)

				error("Not that many lines@in buffer");

			return (addr);

		}

	}

}

/*

 * Abbreviations to make code smaller

 * Left over from squashing ex version 1.1 into

 * 11/34's and 11/40's.

 */

setCNL()

{

	setcount();

	newline();

}

setNAEOL()

{

	setnoaddr();

	eol();

}