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[unix-history] / usr / src / usr.bin / more / command.c
/*
* Copyright (c) 1988 Mark Nudleman
* Copyright (c) 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by Mark Nudleman and the University of California, Berkeley. The
* name of Mark Nudleman or the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)command.c 5.14 (Berkeley) %G%";
#endif /* not lint */
/*
* User-level command processor.
*/
#include <sys/param.h>
#include <stdio.h>
#include <ctype.h>
#include <less.h>
#define NO_MCA 0
#define MCA_DONE 1
#define MCA_MORE 2
extern int erase_char, kill_char, werase_char;
extern int ispipe;
extern int sigs;
extern int quit_at_eof;
extern int hit_eof;
extern int sc_width;
extern int sc_height;
extern int sc_window;
extern int curr_ac;
extern int ac;
extern int quitting;
extern int scroll;
extern int screen_trashed; /* The screen has been overwritten */
static char cmdbuf[120]; /* Buffer for holding a multi-char command */
static char *cp; /* Pointer into cmdbuf */
static int cmd_col; /* Current column of the multi-char command */
static int longprompt; /* if stat command instead of prompt */
static int mca; /* The multicharacter command (action) */
static int last_mca; /* The previous mca */
static int number; /* The number typed by the user */
static int wsearch; /* Search for matches (1) or non-matches (0) */
/*
* Reset command buffer (to empty).
*/
cmd_reset()
{
cp = cmdbuf;
}
/*
* Backspace in command buffer.
*/
static
cmd_erase()
{
if (cp == cmdbuf)
/*
* Backspace past beginning of the string:
* this usually means abort the command.
*/
return(1);
if (CONTROL_CHAR(*--cp)) {
/*
* Erase an extra character, for the carat.
*/
backspace();
--cmd_col;
}
backspace();
--cmd_col;
return(0);
}
/*
* Set up the display to start a new multi-character command.
*/
start_mca(action, prompt)
int action;
char *prompt;
{
lower_left();
clear_eol();
putstr(prompt);
cmd_col = strlen(prompt);
mca = action;
}
/*
* Process a single character of a multi-character command, such as
* a number, or the pattern of a search command.
*/
static
cmd_char(c)
int c;
{
if (c == erase_char)
return(cmd_erase());
/* in this order, in case werase == erase_char */
if (c == werase_char) {
if (cp > cmdbuf) {
while (isspace(cp[-1]) && !cmd_erase());
while (!isspace(cp[-1]) && !cmd_erase());
while (isspace(cp[-1]) && !cmd_erase());
}
return(cp == cmdbuf);
}
if (c == kill_char) {
while (!cmd_erase());
return(1);
}
/*
* No room in the command buffer, or no room on the screen;
* {{ Could get fancy here; maybe shift the displayed line
* and make room for more chars, like ksh. }}
*/
if (cp >= &cmdbuf[sizeof(cmdbuf)-1] || cmd_col >= sc_width-3)
bell();
else {
*cp++ = c;
if (CONTROL_CHAR(c)) {
putchr('^');
cmd_col++;
c = CARAT_CHAR(c);
}
putchr(c);
cmd_col++;
}
return(0);
}
/*
* Return the number currently in the command buffer.
*/
static int
cmd_int()
{
*cp = '\0';
cp = cmdbuf;
return (atoi(cmdbuf));
}
/*
* Move the cursor to lower left before executing a command.
* This looks nicer if the command takes a long time before
* updating the screen.
*/
static
cmd_exec()
{
lower_left();
flush();
}
prompt()
{
extern int terseprompt, linenums;
extern char *current_name, *firstsearch, *next_name;
off_t len, pos, ch_length(), position(), forw_line();
char pbuf[40];
/*
* if nothing is displayed yet, display starting from line 1;
* if search string provided, go there instead.
*/
if (position(TOP) == NULL_POSITION) {
if (forw_line((off_t)0) == NULL_POSITION)
return(0);
if (!firstsearch || !search(1, firstsearch, 1, 1))
jump_back(1);
}
else if (screen_trashed)
repaint();
/* if no -e flag and we've hit EOF on the last file, quit. */
if (!quit_at_eof && hit_eof && curr_ac + 1 >= ac)
quit();
/* select the proper prompt and display it. */
lower_left();
clear_eol();
if (longprompt) {
so_enter();
putstr(current_name);
putstr(":");
if (!ispipe) {
(void)sprintf(pbuf, " file %d/%d", curr_ac + 1, ac);
putstr(pbuf);
}
if (linenums) {
(void)sprintf(pbuf, " line %d", currline(BOTTOM));
putstr(pbuf);
}
if ((pos = position(BOTTOM)) != NULL_POSITION) {
(void)sprintf(pbuf, " byte %ld", pos);
putstr(pbuf);
if (!ispipe && (len = ch_length())) {
(void)sprintf(pbuf, "/%ld pct %ld%%",
len, ((100 * pos) / len));
putstr(pbuf);
}
}
so_exit();
longprompt = 0;
}
else if (terseprompt)
putchr(':');
else {
so_enter();
putstr(current_name);
if (hit_eof)
if (next_name) {
(void)sprintf(pbuf, ": END (%s)", next_name);
putstr(pbuf);
}
else
putstr(": END");
else if (linenums) {
(void)sprintf(pbuf, ": %d", currline(TOP));
putstr(pbuf);
}
so_exit();
}
return(1);
}
/*
* Get command character.
*/
static
getcc()
{
extern int cmdstack;
int ch;
/* left over from error() routine. */
if (cmdstack) {
ch = cmdstack;
cmdstack = NULL;
return(ch);
}
if (cp > cmdbuf && position(TOP) == NULL_POSITION) {
/*
* Command is incomplete, so try to complete it.
* There are only two cases:
* 1. We have "/string" but no newline. Add the \n.
* 2. We have a number but no command. Treat as #g.
* (This is all pretty hokey.)
*/
if (mca != A_DIGIT)
/* Not a number; must be search string */
return('\n');
else
/* A number; append a 'g' */
return('g');
}
return(getchr());
}
/*
* Execute a multicharacter command.
*/
static
exec_mca()
{
extern int file;
extern char *tagfile;
register char *p;
char *glob();
*cp = '\0';
cmd_exec();
switch (mca) {
case A_F_SEARCH:
(void)search(1, cmdbuf, number, wsearch);
break;
case A_B_SEARCH:
(void)search(0, cmdbuf, number, wsearch);
break;
case A_EXAMINE:
for (p = cmdbuf; isspace(*p); ++p);
(void)edit(glob(p));
break;
case A_TAGFILE:
for (p = cmdbuf; isspace(*p); ++p);
findtag(p);
if (tagfile == NULL)
break;
if (edit(tagfile))
(void)tagsearch();
break;
}
}
/*
* Add a character to a multi-character command.
*/
static
mca_char(c)
int c;
{
switch (mca) {
case 0: /* not in a multicharacter command. */
case A_PREFIX: /* in the prefix of a command. */
return(NO_MCA);
case A_DIGIT:
/*
* Entering digits of a number.
* Terminated by a non-digit.
*/
if (!isascii(c) || !isdigit(c) &&
c != erase_char && c != kill_char && c != werase_char) {
/*
* Not part of the number.
* Treat as a normal command character.
*/
number = cmd_int();
mca = 0;
return(NO_MCA);
}
break;
}
/*
* Any other multicharacter command
* is terminated by a newline.
*/
if (c == '\n' || c == '\r') {
/*
* Execute the command.
*/
exec_mca();
return(MCA_DONE);
}
/*
* Append the char to the command buffer.
*/
if (cmd_char(c))
/*
* Abort the multi-char command.
*/
return(MCA_DONE);
/*
* Need another character.
*/
return(MCA_MORE);
}
/*
* Main command processor.
* Accept and execute commands until a quit command, then return.
*/
commands()
{
register int c;
register int action;
last_mca = 0;
scroll = (sc_height + 1) / 2;
for (;;) {
mca = 0;
number = 0;
/*
* See if any signals need processing.
*/
if (sigs) {
psignals();
if (quitting)
quit();
}
/*
* Display prompt and accept a character.
*/
cmd_reset();
if (!prompt()) {
next_file(1);
continue;
}
noprefix();
c = getcc();
again: if (sigs)
continue;
/*
* If we are in a multicharacter command, call mca_char.
* Otherwise we call cmd_decode to determine the
* action to be performed.
*/
if (mca)
switch (mca_char(c)) {
case MCA_MORE:
/*
* Need another character.
*/
c = getcc();
goto again;
case MCA_DONE:
/*
* Command has been handled by mca_char.
* Start clean with a prompt.
*/
continue;
case NO_MCA:
/*
* Not a multi-char command
* (at least, not anymore).
*/
break;
}
/*
* Decode the command character and decide what to do.
*/
switch (action = cmd_decode(c))
{
case A_DIGIT:
/*
* First digit of a number.
*/
start_mca(A_DIGIT, ":");
goto again;
case A_F_SCREEN:
/*
* Forward one screen.
*/
if (number <= 0)
number = sc_window;
if (number <= 0)
number = sc_height - 1;
cmd_exec();
forward(number, 1);
break;
case A_B_SCREEN:
/*
* Backward one screen.
*/
if (number <= 0)
number = sc_window;
if (number <= 0)
number = sc_height - 1;
cmd_exec();
backward(number, 1);
break;
case A_F_LINE:
/*
* Forward N (default 1) line.
*/
if (number <= 0)
number = 1;
cmd_exec();
forward(number, 0);
break;
case A_B_LINE:
/*
* Backward N (default 1) line.
*/
if (number <= 0)
number = 1;
cmd_exec();
backward(number, 0);
break;
case A_F_SCROLL:
/*
* Forward N lines
* (default same as last 'd' or 'u' command).
*/
if (number > 0)
scroll = number;
cmd_exec();
forward(scroll, 0);
break;
case A_B_SCROLL:
/*
* Forward N lines
* (default same as last 'd' or 'u' command).
*/
if (number > 0)
scroll = number;
cmd_exec();
backward(scroll, 0);
break;
case A_FREPAINT:
/*
* Flush buffers, then repaint screen.
* Don't flush the buffers on a pipe!
*/
if (!ispipe)
{
ch_init(0, 0);
clr_linenum();
}
/* FALLTHRU */
case A_REPAINT: /* repaint the screen */
cmd_exec();
repaint();
break;
case A_GOLINE:
/*
* Go to line N, default beginning of file.
*/
if (number <= 0)
number = 1;
cmd_exec();
jump_back(number);
break;
case A_PERCENT:
/*
* Go to a specified percentage into the file.
*/
if (number < 0)
number = 0;
if (number > 100)
number = 100;
cmd_exec();
jump_percent(number);
break;
case A_GOEND:
/*
* Go to line N, default end of file.
*/
cmd_exec();
if (number <= 0)
jump_forw();
else
jump_back(number);
break;
case A_STAT: /* print file name, etc. */
longprompt = 1;
continue;
case A_QUIT: /* exit */
quit();
case A_F_SEARCH:
case A_B_SEARCH:
/*
* Search for a pattern.
* Accept chars of the pattern until \n.
*/
if (number <= 0)
number = 1;
start_mca(action, (action==A_F_SEARCH) ? "/" : "?");
last_mca = mca;
wsearch = 1;
c = getcc();
if (c == '!') {
/*
* Invert the sense of the search.
* Set wsearch to 0 and get a new
* character for the start of the pattern.
*/
start_mca(action,
(action==A_F_SEARCH) ? "!/" : "!?");
wsearch = 0;
c = getcc();
}
goto again;
case A_AGAIN_SEARCH:
/*
* Repeat previous search.
*/
if (number <= 0)
number = 1;
if (wsearch)
start_mca(last_mca,
(last_mca==A_F_SEARCH) ? "/" : "?");
else
start_mca(last_mca,
(last_mca==A_F_SEARCH) ? "!/" : "!?");
cmd_exec();
(void)search(mca == A_F_SEARCH, (char *)NULL,
number, wsearch);
break;
case A_HELP:
/*
* Help.
*/
lower_left();
clear_eol();
putstr("help");
cmd_exec();
help();
break;
case A_TAGFILE: /* tag a new file; get the file name */
cmd_reset();
start_mca(A_TAGFILE, "Tag: ");
c = getcc();
goto again;
case A_FILE_LIST: /* show list of file names */
cmd_exec();
showlist();
repaint();
break;
case A_EXAMINE: /* edit a new file; get the file name */
cmd_reset();
start_mca(A_EXAMINE, "Examine: ");
c = getcc();
goto again;
case A_VISUAL:
/*
* Invoke an editor on the input file.
*/
if (ispipe)
{
error("Cannot edit standard input");
break;
}
cmd_exec();
editfile();
ch_init(0, 0);
clr_linenum();
break;
case A_NEXT_FILE:
/*
* Examine next file.
*/
if (number <= 0)
number = 1;
next_file(number);
break;
case A_PREV_FILE:
/*
* Examine previous file.
*/
if (number <= 0)
number = 1;
prev_file(number);
break;
case A_SETMARK:
/*
* Set a mark.
*/
lower_left();
clear_eol();
start_mca(A_SETMARK, "mark: ");
c = getcc();
if (c == erase_char || c == kill_char)
break;
setmark(c);
break;
case A_GOMARK:
/*
* Go to a mark.
*/
lower_left();
clear_eol();
start_mca(A_GOMARK, "goto mark: ");
c = getcc();
if (c == erase_char || c == kill_char)
break;
gomark(c);
break;
case A_PREFIX:
/*
* The command is incomplete (more chars are needed).
* Display the current char so the user knows
* what's going on and get another character.
*/
if (mca != A_PREFIX)
start_mca(A_PREFIX, "& ");
if (CONTROL_CHAR(c))
{
putchr('^');
c = CARAT_CHAR(c);
}
putchr(c);
c = getcc();
goto again;
default:
bell();
break;
}
}
}
static
editfile()
{
extern char *current_file;
static int dolinenumber;
static char *editor;
int c;
char buf[MAXPATHLEN * 2 + 20], *getenv();
if (editor == NULL) {
editor = getenv("EDITOR");
/* pass the line number to vi */
if (editor == NULL || *editor == '\0') {
#define EDIT_PGM "/usr/ucb/vi"
editor = EDIT_PGM;
dolinenumber = 1;
}
else
dolinenumber = 0;
}
if (dolinenumber && (c = currline(MIDDLE)))
(void)sprintf(buf, "%s +%d %s", editor, c, current_file);
else
(void)sprintf(buf, "%s %s", editor, current_file);
lsystem(buf);
}
static
showlist()
{
extern int sc_width;
extern char **av;
register int indx, width;
int len;
char *p;
if (ac <= 0) {
error("No files provided as arguments.");
return;
}
for (width = indx = 0; indx < ac;) {
p = strcmp(av[indx], "-") ? av[indx] : "stdin";
len = strlen(p) + 1;
if (curr_ac == indx)
len += 2;
if (width + len + 1 >= sc_width) {
if (!width) {
if (curr_ac == indx)
putchr('[');
putstr(p);
if (curr_ac == indx)
putchr(']');
++indx;
}
width = 0;
putchr('\n');
continue;
}
if (width)
putchr(' ');
if (curr_ac == indx)
putchr('[');
putstr(p);
if (curr_ac == indx)
putchr(']');
width += len;
++indx;
}
putchr('\n');
error((char *)NULL);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.