742 lines
18 KiB
C
742 lines
18 KiB
C
/*
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* Copyright (c) 1988 Mark Nudleman
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* Portions copyright (c) 1999 T. Michael Vanderhoek
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)command.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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/*
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* Functions for interacting with the user directly printing hello
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* messages or reading from the terminal. All of these functions deal
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* specifically with the prompt line, and only the prompt line.
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*/
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#include <sys/param.h>
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#include <assert.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include "less.h"
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#include "pathnames.h"
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extern int erase_char, kill_char, werase_char;
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extern int sigs;
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extern int quit_at_eof;
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extern int hit_eof;
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extern int horiz_off;
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extern int sc_width;
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extern int bo_width;
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extern int be_width;
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extern int so_width;
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extern int se_width;
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extern int curr_ac;
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extern int ac;
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extern char **av;
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extern int screen_trashed; /* The screen has been overwritten */
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static int cmd_col; /* Current screen column when accepting input */
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static cmd_char(), cmd_erase(), getcc();
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/*****************************************************************************
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*
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* Functions for reading-in user input.
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*
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*/
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static int biggetinputhack_f;
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/* biggetinputhack()
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*
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* Performs as advertised.
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*/
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biggetinputhack()
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{
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biggetinputhack_f = 1;
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}
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/*
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* Read a line of input from the terminal. Reads at most bufsiz - 1 characters
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* and places them in buffer buf. They are NUL-terminated. Prints the
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* temporary prompt prompt. Returns true if the user aborted the input and
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* returns false otherwise.
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*/
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int
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getinput(prompt, buf, bufsiz)
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const char *prompt;
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char *buf;
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int bufsiz;
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{
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extern bo_width, be_width;
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char *bufcur;
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int c;
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prmpt(prompt);
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bufcur = buf;
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for (;;) {
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c = getcc();
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if (c == '\n') {
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*bufcur = '\0';
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return 0;
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}
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if (c == READ_INTR ||
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cmd_char(c, buf, &bufcur, buf + bufsiz - 1)) {
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/* input cancelled */
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if (bufsiz) *buf = '\0';
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return 1;
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}
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if (biggetinputhack_f) {
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biggetinputhack_f = 0;
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*bufcur = '\0';
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return 0;
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}
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}
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}
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/*
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* Process a single character of a multi-character input, such as
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* a number, or the pattern of a search command. Returns true if the user
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* has cancelled the multi-character input, false otherwise and attempts
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* to add it to buf (not exceeding bufsize). Prints the character on the
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* terminal output. The bufcur should initially equal bufbeg. After that
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* it does not need to be touched or modified by the user, but may be expected
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* to point at the future position of the next character.
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*/
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static int
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cmd_char(c, bufbeg, bufcur, bufend)
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int c; /* The character to process */
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char *bufbeg; /* The buffer to add the character to */
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char **bufcur; /* The position at which to add the character */
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char *bufend; /* One after the last address available in the buffer.
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* No character will be placed into *bufend. */
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{
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if (c == erase_char)
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return(cmd_erase(bufbeg, bufcur));
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/* in this order, in case werase == erase_char */
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if (c == werase_char) {
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if (*bufcur > bufbeg) {
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while (isspace((*bufcur)[-1]) &&
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!cmd_erase(bufbeg, bufcur)) ;
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while (!isspace((*bufcur)[-1]) &&
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!cmd_erase(bufbeg, bufcur)) ;
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while (isspace((*bufcur)[-1]) &&
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!cmd_erase(bufbeg, bufcur)) ;
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}
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return *bufcur == bufbeg;
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}
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if (c == kill_char) {
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while (!cmd_erase(bufbeg, bufcur));
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return 1;
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}
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/*
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* No room in the command buffer, or no room on the screen;
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* XXX If there is no room on the screen, we should just let the
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* screen scroll down and set screen_trashed=1 appropriately, or
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* alternatively, scroll the prompt line horizontally.
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*/
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assert (*bufcur <= bufend);
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if (*bufcur == bufend || cmd_col >= sc_width - 3)
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bell();
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else {
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*(*bufcur)++ = c;
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if (CONTROL_CHAR(c)) {
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putchr('^');
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cmd_col++;
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c &= ~0200;
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c = CARAT_CHAR(c);
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}
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putchr(c);
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cmd_col++;
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}
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return 0;
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}
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/*
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* Helper function to cmd_char(). Backs-up one character from bufcur in the
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* buffer passed, and prints a backspace on the screen. Returns true if the
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* we backspaced past bufbegin (ie. the input is being aborted), and false
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* otherwise. The bufcur is expected to point to the future location of the
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* next character in the buffer, and is modified appropriately.
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*/
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static
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cmd_erase(bufbegin, bufcur)
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char *bufbegin;
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char **bufcur;
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{
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int c;
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/*
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* XXX Could add code to detect a backspace that is backing us over
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* the beginning of a line and onto the previous line. The backspace
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* would not be printed for some terminals (eg. hardcopy) in that
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* case.
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*/
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/*
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* backspace past beginning of the string: this usually means
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* abort the input.
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*/
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if (*bufcur == bufbegin)
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return 1;
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(*bufcur)--;
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/* If erasing a control-char, erase an extra character for the carat. */
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c = **bufcur;
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if (CONTROL_CHAR(c)) {
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backspace();
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cmd_col--;
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}
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backspace();
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cmd_col--;
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return 0;
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}
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static int ungotcc;
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/*
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* Get command character from the terminal.
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*/
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static
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getcc()
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{
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int ch;
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off_t position();
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/* left over from error() routine. */
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if (ungotcc) {
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ch = ungotcc;
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ungotcc = 0;
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return(ch);
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}
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return(getchr());
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}
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/*
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* Same as ungetc(), but works for people who don't like to use streams.
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*/
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ungetcc(c)
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int c;
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{
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ungotcc = c;
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}
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/*****************************************************************************
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*
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* prompts
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*
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*/
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static int longprompt;
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/*
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* Prints prmpt where the prompt would normally appear. This is different
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* from changing the current prompt --- this is more like printing a
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* unimportant notice or error. The prmpt line will be printed in bold (if
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* possible). Will in the future print only the last sc_width - 1 - bo_width
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* characters (to prevent newline).
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*/
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prmpt(prmpt)
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const char *prmpt;
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{
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lower_left();
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clear_eol();
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bo_enter();
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putxstr(prmpt);
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bo_exit();
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flush();
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cmd_col = strlen(prmpt) + bo_width + be_width;
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}
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/*
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* Print the main prompt that signals we are ready for user commands. This
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* also magically positions the current file where it should be (either by
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* calling repaint() if screen_trashed or by searching for a search
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* string that was specified through option.c on the more(1) command line).
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* Additional magic will randomly call the quit() function.
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*
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* This is really intended to do a lot of the work of commands(). It has
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* little purpose outside of commands().
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*/
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prompt()
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{
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extern int linenums, short_file, ispipe;
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extern char *current_name, *firstsearch, *next_name;
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off_t len, pos, ch_length(), position(), forw_line();
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char pbuf[40];
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/*
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* if nothing is displayed yet, display starting from line 1;
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* if search string provided, go there instead.
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*/
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if (position(TOP) == NULL_POSITION) {
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#if 0
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/* This code causes "more zero-byte-file /etc/termcap" to skip straight
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* to the /etc/termcap file ... that is undesireable. There are only a few
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* instances where these two lines perform something useful. */
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if (forw_line((off_t)0) == NULL_POSITION)
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return 0 ;
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#endif
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if (!firstsearch || !search(1, firstsearch, 1, 1))
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jump_back(1);
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}
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else if (screen_trashed)
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repaint();
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/* if no -e flag and we've hit EOF on the last file, quit. */
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if (!quit_at_eof && hit_eof && curr_ac + 1 >= ac)
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quit();
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/* select the proper prompt and display it. */
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lower_left();
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clear_eol();
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pbuf[sizeof(pbuf) - 1] = '\0';
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if (longprompt) {
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/*
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* Get the current line/pos from the BOTTOM of the screen
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* even though that's potentially confusing for the user
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* when switching between wraplines=true and a valid horiz_off
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* (with wraplines=false). In exchange, it is sometimes
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* easier for the user to tell when a file is relatively
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* short vs. long.
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*/
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so_enter();
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putstr(current_name);
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putstr(":");
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if (!ispipe) {
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(void)snprintf(pbuf, sizeof(pbuf) - 1,
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" file %d/%d", curr_ac + 1, ac);
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putstr(pbuf);
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}
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if (linenums) {
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(void)snprintf(pbuf, sizeof(pbuf) - 1,
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" line %d", currline(BOTTOM));
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putstr(pbuf);
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}
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(void)snprintf(pbuf, sizeof(pbuf) - 1, " col %d", horiz_off);
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putstr(pbuf);
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if ((pos = position(BOTTOM)) != NULL_POSITION) {
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(void)snprintf(pbuf, sizeof(pbuf) - 1,
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" byte %qd", pos);
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putstr(pbuf);
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if (!ispipe && (len = ch_length())) {
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(void)snprintf(pbuf, sizeof(pbuf) - 1,
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"/%qd pct %qd%%", len, ((100 * pos) / len));
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putstr(pbuf);
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}
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}
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so_exit();
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}
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else {
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so_enter();
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putstr(current_name);
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if (hit_eof)
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if (next_name) {
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putstr(": END (next file: ");
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putstr(next_name);
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putstr(")");
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}
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else
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putstr(": END");
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else if (!ispipe &&
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(pos = position(BOTTOM)) != NULL_POSITION &&
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(len = ch_length())) {
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(void)snprintf(pbuf, sizeof(pbuf) - 1,
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" (%qd%%)", ((100 * pos) / len));
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putstr(pbuf);
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}
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so_exit();
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}
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return 1;
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}
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/*
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* Sets the current prompt. Currently it sets the current prompt to the
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* long prompt.
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*/
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statprompt(nostatprompt)
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int nostatprompt; /* Turn off the stat prompt? (off by default...) */
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{
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if (nostatprompt)
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longprompt = 0;
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else
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longprompt = 1;
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}
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/*****************************************************************************
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*
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* Errors, next-of-kin to prompts.
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*
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*/
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/*
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* Shortcut function that may be used when setting the current erreur
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* and erreur string at the same time. The function name is chosen to be
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* symetric with the SETERR() macro in less.h. This could be written as
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* macro, too, but we'd need to use a GNU C extension.
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*/
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SETERRSTR(enum error e, const char *s, ...)
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{
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va_list args;
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erreur = e;
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if (errstr) free(errstr);
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errstr = NULL;
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va_start(args, s);
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vasprintf(&errstr, s, args);
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va_end(args);
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}
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/*
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* Prints an error message and clears the current error.
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*/
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handle_error()
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{
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if (erreur == E_OK)
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return;
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bell();
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if (errstr)
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error(errstr);
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else
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error(deferr[erreur]);
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erreur = E_OK;
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errstr = NULL;
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}
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/*
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* Clears any error messages and pretends they never occurred.
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*/
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clear_error()
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{
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erreur = E_OK;
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if (errstr) free(errstr);
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errstr = NULL;
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}
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int errmsgs;
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static char return_to_continue[] = "(press RETURN)";
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|
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/*
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* Output a message in the lower left corner of the screen
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* and wait for carriage return.
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*/
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/* static */
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error(s)
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char *s;
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{
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extern int any_display;
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int ch;
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errmsgs++;
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if (!any_display) {
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/*
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* Nothing has been displayed yet. Output this message on
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* error output (file descriptor 2) and don't wait for a
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* keystroke to continue.
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*
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* This has the desirable effect of producing all error
|
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* messages on error output if standard output is directed
|
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* to a file. It also does the same if we never produce
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* any real output; for example, if the input file(s) cannot
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* be opened. If we do eventually produce output, code in
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* edit() makes sure these messages can be seen before they
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* are overwritten or scrolled away.
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*/
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(void)write(2, s, strlen(s));
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(void)write(2, "\n", 1);
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return;
|
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}
|
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|
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lower_left();
|
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clear_eol();
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so_enter();
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if (s) {
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putstr(s);
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putstr(" ");
|
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}
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putstr(return_to_continue);
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so_exit();
|
|
|
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if ((ch = getchr()) != '\n') {
|
|
/* XXX hardcoded */
|
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if (ch == 'q')
|
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quit();
|
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ungotcc = ch;
|
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}
|
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lower_left();
|
|
|
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if ((s==NULL)?0:(strlen(s)) + sizeof(return_to_continue) +
|
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so_width + se_width + 1 > sc_width) {
|
|
/*
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|
* Printing the message has probably scrolled the screen.
|
|
* {{ Unless the terminal doesn't have auto margins,
|
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* in which case we just hammered on the right margin. }}
|
|
*/
|
|
/* XXX Should probably just set screen_trashed=1, but I'm
|
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* not going to touch that until all the places that call
|
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* error() have been checked, or until error() is staticized. */
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repaint();
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}
|
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flush();
|
|
}
|
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|
|
|
|
/****************************************************************************
|
|
*
|
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* The main command processor.
|
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*
|
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* (Well, it deals with things on the prompt line, doesn't it?)
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*
|
|
*/
|
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|
|
/*
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|
* Main command processor.
|
|
*
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|
* 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);
|
|
}
|