/*
* Copyright (c) 1988 Mark Nudleman
* Portions copyright (c) 1999 T. Michael Vanderhoek
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)command.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#ifndef lint
static const char rcsid[] =
"$FreeBSD: src/usr.bin/more/command.c,v 1.17 2000/01/08 18:11:05 hoek Exp $";
#endif /* not lint */
/*
* Functions for interacting with the user directly printing hello
* messages or reading from the terminal. All of these functions deal
* specifically with the prompt line, and only the prompt line.
*/
#include <sys/param.h>
#include <assert.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "less.h"
#include "pathnames.h"
extern int erase_char, kill_char, werase_char;
extern int sigs;
extern int quit_at_eof;
extern int hit_eof;
extern int horiz_off;
extern int sc_width;
extern int bo_width;
extern int be_width;
extern int so_width;
extern int se_width;
extern int curr_ac;
extern int ac;
extern char **av;
extern int screen_trashed; /* The screen has been overwritten */
static int cmd_col; /* Current screen column when accepting input */
static cmd_char(), cmd_erase(), getcc();
/*****************************************************************************
*
* Functions for reading-in user input.
*
*/
static int biggetinputhack_f;
/* biggetinputhack()
*
* Performs as advertised.
*/
biggetinputhack()
{
biggetinputhack_f = 1;
}
/*
* Read a line of input from the terminal. Reads at most bufsiz - 1 characters
* and places them in buffer buf. They are NUL-terminated. Prints the
* temporary prompt prompt. Returns true if the user aborted the input and
* returns false otherwise.
*/
int
getinput(prompt, buf, bufsiz)
const char *prompt;
char *buf;
int bufsiz;
{
extern bo_width, be_width;
char *bufcur;
int c;
prmpt(prompt);
bufcur = buf;
for (;;) {
c = getcc();
if (c == '\n') {
*bufcur = '\0';
return 0;
}
if (c == READ_INTR ||
cmd_char(c, buf, &bufcur, buf + bufsiz - 1)) {
/* input cancelled */
if (bufsiz) *buf = '\0';
return 1;
}
if (biggetinputhack_f) {
biggetinputhack_f = 0;
*bufcur = '\0';
return 0;
}
}
}
/*
* Process a single character of a multi-character input, such as
* a number, or the pattern of a search command. Returns true if the user
* has cancelled the multi-character input, false otherwise and attempts
* to add it to buf (not exceeding bufsize). Prints the character on the
* terminal output. The bufcur should initially equal bufbeg. After that
* it does not need to be touched or modified by the user, but may be expected
* to point at the future position of the next character.
*/
static int
cmd_char(c, bufbeg, bufcur, bufend)
int c; /* The character to process */
char *bufbeg; /* The buffer to add the character to */
char **bufcur; /* The position at which to add the character */
char *bufend; /* One after the last address available in the buffer.
* No character will be placed into *bufend. */
{
if (c == erase_char)
return(cmd_erase(bufbeg, bufcur));
/* in this order, in case werase == erase_char */
if (c == werase_char) {
if (*bufcur > bufbeg) {
while (isspace((*bufcur)[-1]) &&
!cmd_erase(bufbeg, bufcur)) ;
while (!isspace((*bufcur)[-1]) &&
!cmd_erase(bufbeg, bufcur)) ;
while (isspace((*bufcur)[-1]) &&
!cmd_erase(bufbeg, bufcur)) ;
}
return *bufcur == bufbeg;
}
if (c == kill_char) {
while (!cmd_erase(bufbeg, bufcur));
return 1;
}
/*
* No room in the command buffer, or no room on the screen;
* XXX If there is no room on the screen, we should just let the
* screen scroll down and set screen_trashed=1 appropriately, or
* alternatively, scroll the prompt line horizontally.
*/
assert (*bufcur <= bufend);
if (*bufcur == bufend || cmd_col >= sc_width - 3)
bell();
else {
*(*bufcur)++ = c;
if (CONTROL_CHAR(c)) {
putchr('^');
cmd_col++;
c &= ~0200;
c = CARAT_CHAR(c);
}
putchr(c);
cmd_col++;
}
return 0;
}
/*
* Helper function to cmd_char(). Backs-up one character from bufcur in the
* buffer passed, and prints a backspace on the screen. Returns true if the
* we backspaced past bufbegin (ie. the input is being aborted), and false
* otherwise. The bufcur is expected to point to the future location of the
* next character in the buffer, and is modified appropriately.
*/
static
cmd_erase(bufbegin, bufcur)
char *bufbegin;
char **bufcur;
{
int c;
/*
* XXX Could add code to detect a backspace that is backing us over
* the beginning of a line and onto the previous line. The backspace
* would not be printed for some terminals (eg. hardcopy) in that
* case.
*/
/*
* backspace past beginning of the string: this usually means
* abort the input.
*/
if (*bufcur == bufbegin)
return 1;
(*bufcur)--;
/* If erasing a control-char, erase an extra character for the carat. */
c = **bufcur;
if (CONTROL_CHAR(c)) {
backspace();
cmd_col--;
}
backspace();
cmd_col--;
return 0;
}
static int ungotcc;
/*
* Get command character from the terminal.
*/
static
getcc()
{
int ch;
off_t position();
/* left over from error() routine. */
if (ungotcc) {
ch = ungotcc;
ungotcc = 0;
return(ch);
}
return(getchr());
}
/*
* Same as ungetc(), but works for people who don't like to use streams.
*/
ungetcc(c)
int c;
{
ungotcc = c;
}
/*****************************************************************************
*
* prompts
*
*/
static int longprompt;
/*
* Prints prmpt where the prompt would normally appear. This is different
* from changing the current prompt --- this is more like printing a
* unimportant notice or error. The prmpt line will be printed in bold (if
* possible). Will in the future print only the last sc_width - 1 - bo_width
* characters (to prevent newline).
*/
prmpt(prmpt)
const char *prmpt;
{
lower_left();
clear_eol();
bo_enter();
putxstr(prmpt);
bo_exit();
flush();
cmd_col = strlen(prmpt) + bo_width + be_width;
}
/*
* Print the main prompt that signals we are ready for user commands. This
* also magically positions the current file where it should be (either by
* calling repaint() if screen_trashed or by searching for a search
* string that was specified through option.c on the more(1) command line).
* Additional magic will randomly call the quit() function.
*
* This is really intended to do a lot of the work of commands(). It has
* little purpose outside of commands().
*/
prompt()
{
extern int linenums, short_file, ispipe;
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 0
/* This code causes "more zero-byte-file /etc/termcap" to skip straight
* to the /etc/termcap file ... that is undesireable. There are only a few
* instances where these two lines perform something useful. */
if (forw_line((off_t)0) == NULL_POSITION)
return 0 ;
#endif
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();
pbuf[sizeof(pbuf) - 1] = '\0';
if (longprompt) {
/*
* Get the current line/pos from the BOTTOM of the screen
* even though that's potentially confusing for the user
* when switching between wraplines=true and a valid horiz_off
* (with wraplines=false). In exchange, it is sometimes
* easier for the user to tell when a file is relatively
* short vs. long.
*/
so_enter();
putstr(current_name);
putstr(":");
if (!ispipe) {
(void)snprintf(pbuf, sizeof(pbuf) - 1,
" file %d/%d", curr_ac + 1, ac);
putstr(pbuf);
}
if (linenums) {
(void)snprintf(pbuf, sizeof(pbuf) - 1,
" line %d", currline(BOTTOM));
putstr(pbuf);
}
(void)snprintf(pbuf, sizeof(pbuf) - 1, " col %d", horiz_off);
putstr(pbuf);
if ((pos = position(BOTTOM)) != NULL_POSITION) {
(void)snprintf(pbuf, sizeof(pbuf) - 1,
" byte %qd", pos);
putstr(pbuf);
if (!ispipe && (len = ch_length())) {
(void)snprintf(pbuf, sizeof(pbuf) - 1,
"/%qd pct %qd%%", len, ((100 * pos) / len));
putstr(pbuf);
}
}
so_exit();
}
else {
so_enter();
putstr(current_name);
if (hit_eof)
if (next_name) {
putstr(": END (next file: ");
putstr(next_name);
putstr(")");
}
else
putstr(": END");
else if (!ispipe &&
(pos = position(BOTTOM)) != NULL_POSITION &&
(len = ch_length())) {
(void)snprintf(pbuf, sizeof(pbuf) - 1,
" (%qd%%)", ((100 * pos) / len));
putstr(pbuf);
}
so_exit();
}
/*
* XXX This isn't correct, but until we get around to reworking
* the whole prompt stuff the way we want it to be, this hack
* is necessary to prevent input from being blocked if getinput()
* is called and the user enters an input that fills the cmd
* buffer (or reaches the far rightside end of the screen).
*/
cmd_col = 0;
return 1;
}
/*
* Sets the current prompt. Currently it sets the current prompt to the
* long prompt.
*/
statprompt(nostatprompt)
int nostatprompt; /* Turn off the stat prompt? (off by default...) */
{
if (nostatprompt)
longprompt = 0;
else
longprompt = 1;
}
/*****************************************************************************
*
* Errors, next-of-kin to prompts.
*
*/
/*
* Shortcut function that may be used when setting the current erreur
* and erreur string at the same time. The function name is chosen to be
* symetric with the SETERR() macro in less.h. This could be written as
* macro, too, but we'd need to use a GNU C extension.
*/
SETERRSTR(enum error e, const char *s, ...)
{
va_list args;
erreur = e;
if (errstr) free(errstr);
errstr = NULL;
va_start(args, s);
vasprintf(&errstr, s, args);
va_end(args);
}
/*
* Prints an error message and clears the current error.
*/
handle_error()
{
if (erreur == E_OK)
return;
bell();
if (errstr)
error(errstr);
else
error(deferr[erreur]);
erreur = E_OK;
errstr = NULL;
}
/*
* Clears any error messages and pretends they never occurred.
*/
clear_error()
{
erreur = E_OK;
if (errstr) free(errstr);
errstr = NULL;
}
int errmsgs;
static char return_to_continue[] = "(press RETURN)";
/*
* Output a message in the lower left corner of the screen
* and wait for carriage return.
*/
/* static */
error(s)
char *s;
{
extern int any_display;
int ch;
errmsgs++;
if (!any_display) {
/*
* Nothing has been displayed yet. Output this message on
* error output (file descriptor 2) and don't wait for a
* keystroke to continue.
*
* This has the desirable effect of producing all error
* messages on error output if standard output is directed
* to a file. It also does the same if we never produce
* any real output; for example, if the input file(s) cannot
* be opened. If we do eventually produce output, code in
* edit() makes sure these messages can be seen before they
* are overwritten or scrolled away.
*/
(void)write(2, s, strlen(s));
(void)write(2, "\n", 1);
return;
}
lower_left();
clear_eol();
so_enter();
if (s) {
putstr(s);
putstr(" ");
}
putstr(return_to_continue);
so_exit();
if ((ch = getchr()) != '\n') {
/* XXX hardcoded */
if (ch == 'q')
quit();
ungotcc = ch;
}
lower_left();
if ((s==NULL)?0:(strlen(s)) + sizeof(return_to_continue) +
so_width + se_width + 1 > sc_width) {
/*
* Printing the message has probably scrolled the screen.
* {{ Unless the terminal doesn't have auto margins,
* in which case we just hammered on the right margin. }}
*/
/* XXX Should probably just set screen_trashed=1, but I'm
* not going to touch that until all the places that call
* error() have been checked, or until error() is staticized. */
repaint();
}
flush();
}
/****************************************************************************
*
* The main command processor.
*
* (Well, it deals with things on the prompt line, doesn't it?)
*
*/
/*
* Main command processor.
*
* Accept and execute commands until a quit command, then return.
*/
commands()
{
enum runmacro runmacro();
enum runmacro rmret;
long numberN;
enum { NOTGOTTEN=0, GOTTEN=1, GETTING } Nstate; /* ie. numberNstate */
int c;
char inbuf[20], *incur = inbuf;
*inbuf = '\0';
Nstate = GETTING;
for (;;) {
/*
* See if any signals need processing.
*/
if (sigs)
psignals();
/*
* Display prompt and generally get setup. Don't display the
* prompt if we are already in the middle of accepting a
* set of characters.
*/
if (!*inbuf && !prompt()) {
next_file(1);
continue;
}
c = getcc();
/* Check sigs here --- getcc() may have given us READ_INTR */
if (sigs) {
/* terminate any current macro */
*inbuf = '\0';
incur = inbuf;
continue; /* process the sigs */
}
if (Nstate == GETTING && !isdigit(c)
&& c != erase_char && c != werase_char && c != kill_char) {
/*
* Mark the end of an input number N, if any.
*/
if (!*inbuf) {
/* We never actually got an input number */
Nstate = NOTGOTTEN;
} else {
numberN = atol(inbuf);
Nstate = GOTTEN;
}
*inbuf = '\0';
incur = inbuf;
}
(void) cmd_char(c, inbuf, &incur, inbuf + sizeof(inbuf) - 1);
*incur = '\0';
if (*inbuf)
prmpt(inbuf);
else
Nstate = GETTING; /* abort command */
if (Nstate == GETTING) {
/* Still reading in the number N ... don't want to
* try running the macro expander. */
continue;
} else {
/* Try expanding the macro */
switch (runmacro(inbuf, numberN, Nstate)) {
case TOOMACRO:
break;
case BADMACRO: case NOMACRO: case BADCOMMAND:
handle_error();
/* fallthrough */
case OK:
/* recock */
*inbuf = '\0';
incur = inbuf;
Nstate = GETTING;
break;
}
}
} /* for (;;) */
}
/*****************************************************************************
*
* Misc functions that belong in ncommand.c but are here for historical
* and for copyright reasons.
*
*/
editfile()
{
off_t position();
extern char *current_file;
static int dolinenumber;
static char *editor;
char *base;
int linenumber;
char buf[MAXPATHLEN * 2 + 20], *getenv();
if (editor == NULL) {
editor = getenv("EDITOR");
/* default editor is vi */
if (editor == NULL || *editor == '\0')
editor = _PATH_VI;
/* check last component in case of full path */
base = strrchr(editor, '/');
if (!base)
base = editor;
else
base++;
/* emacs also accepts vi-style +nnnn */
if (strncmp(base, "vi", 2) == 0 || strcmp(base, "emacs") == 0)
dolinenumber = 1;
else
dolinenumber = 0;
}
/*
* XXX Can't just use currline(MIDDLE) since that might be NULL_POSITION
* if we are editting a short file or some kind of search positioned
* us near the last line. It's not clear what currline() should do
* in those circumstances, but as of this writing, it doesn't do
* anything reasonable from our perspective. The currline(MIDDLE)
* never had the desired results for an editfile() after a search()
* anyways. Note, though, that when vi(1) starts its editting, it
* positions the focus line in the middle of the screen, not the top.
*
* I think what is needed is some kind of setfocus() and getfocus()
* function. This could put the focussed line in the middle, top,
* or wherever as per the user's wishes, and allow things like us
* to getfocus() the correct file-position/line-number. A search would
* then search forward (or backward) from the current focus position,
* etc.
*
* currline() doesn't belong.
*/
if (position(MIDDLE) == NULL_POSITION)
linenumber = currline(TOP);
else
linenumber = currline(MIDDLE);
if (dolinenumber && linenumber)
(void)snprintf(buf, sizeof(buf),
"%s +%d %s", editor, linenumber, current_file);
else
(void)snprintf(buf, sizeof(buf), "%s %s", editor, current_file);
lsystem(buf);
}
showlist()
{
extern int sc_width;
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);
}
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