/*
* Copyright (C) 1980 The 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 the University of California, Berkeley. The name of 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 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* more.c - General purpose tty output filter and file perusal program
*
* by Eric Shienbrood, UC Berkeley
*
* modified by Geoff Peck
* UCB to add underlining, single spacing
* modified by John Foderaro
* UCB to add -c and MORE environment variable
* modified by Erik Troan <ewt@redhat.com>
* to be more posix and so compile on linux/axp.
* modified by Kars de Jong <jongk@cs.utwente.nl>
* to use terminfo instead of termcap.
* 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
* added Native Language Support
* 1999-03-19 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
* more nls translatable strings
* 1999-05-09 aeb
* applied a RedHat patch (setjmp->sigsetjmp); without it a second
* ^Z would fail.
* 1999-05-09 aeb
* undone Kars' work, so that more works without libcurses (and
* hence can be in /bin with libcurses being in
* /usr/lib which may not be mounted). However, when termcap is not
* present curses can still be used.
* 2010-10-21 Davidlohr Bueso <dave@gnu.org>
* modified mem allocation handling for util-linux
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/param.h>
#include <ctype.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/ttydefaults.h>
#include <sys/wait.h>
#include <regex.h>
#include <assert.h>
#include <poll.h>
#include <sys/signalfd.h>
#include <paths.h>
#include <getopt.h>
#if defined(HAVE_NCURSESW_TERM_H)
# include <ncursesw/term.h>
#elif defined(HAVE_NCURSES_TERM_H)
# include <ncurses/term.h>
#elif defined(HAVE_TERM_H)
# include <term.h>
#endif
#ifdef HAVE_MAGIC
# include <magic.h>
#endif
#include "strutils.h"
#include "nls.h"
#include "xalloc.h"
#include "widechar.h"
#include "closestream.h"
#include "rpmatch.h"
#include "env.h"
#ifdef TEST_PROGRAM
# define NON_INTERACTIVE_MORE 1
#endif
#define BACKSPACE "\b"
#define CARAT "^"
#define ARROW_UP "\x1b\x5b\x41"
#define ARROW_DOWN "\x1b\x5b\x42"
#define PAGE_UP "\x1b\x5b\x35\x7e"
#define PAGE_DOWN "\x1b\x5b\x36\x7e"
#define MIN_LINE_SZ 256 /* minimal line_buf buffer size */
#define ESC '\033'
#define SCROLL_LEN 11
#define LINES_PER_PAGE 24
#define NUM_COLUMNS 80
#define TERMINAL_BUF 4096
#define INIT_BUF 80
#define COMMAND_BUF 200
#define REGERR_BUF NUM_COLUMNS
#define TERM_AUTO_RIGHT_MARGIN "am"
#define TERM_BACKSPACE "cub1"
#define TERM_CEOL "xhp"
#define TERM_CLEAR "clear"
#define TERM_CLEAR_TO_LINE_END "el"
#define TERM_CLEAR_TO_SCREEN_END "ed"
#define TERM_COLS "cols"
#define TERM_CURSOR_ADDRESS "cup"
#define TERM_EAT_NEW_LINE "xenl"
#define TERM_EXIT_STANDARD_MODE "rmso"
#define TERM_HARD_COPY "hc"
#define TERM_HOME "home"
#define TERM_LINE_DOWN "cud1"
#define TERM_LINES "lines"
#define TERM_OVER_STRIKE "os"
#define TERM_STANDARD_MODE "smso"
#define TERM_STD_MODE_GLITCH "xmc"
/* Used in read_command() */
typedef enum {
more_kc_unknown_command,
more_kc_colon,
more_kc_repeat_previous,
more_kc_backwards,
more_kc_jump_lines_per_screen,
more_kc_set_lines_per_screen,
more_kc_set_scroll_len,
more_kc_quit,
more_kc_skip_forward_screen,
more_kc_skip_forward_line,
more_kc_next_line,
more_kc_clear_screen,
more_kc_previous_search_match,
more_kc_display_line,
more_kc_display_file_and_line,
more_kc_repeat_search,
more_kc_search,
more_kc_run_shell,
more_kc_help,
more_kc_next_file,
more_kc_previous_file,
more_kc_run_editor
} more_key_commands;
struct number_command {
unsigned int number;
more_key_commands key;
};
struct more_control {
struct termios output_tty; /* output terminal */
struct termios original_tty; /* original terminal settings */
FILE *current_file; /* currently open input file */
off_t file_position; /* file position */
off_t file_size; /* file size */
int argv_position; /* argv[] position */
int lines_per_screen; /* screen size in lines */
int d_scroll_len; /* number of lines scrolled by 'd' */
int prompt_len; /* message prompt length */
int current_line; /* line we are currently at */
int next_jump; /* number of lines to skip ahead */
char **file_names; /* The list of file names */
int num_files; /* Number of files left to process */
char *shell; /* name of the shell to use */
int sigfd; /* signalfd() file descriptor */
sigset_t sigset; /* signal operations */
char *line_buf; /* line buffer */
size_t line_sz; /* size of line_buf buffer */
int lines_per_page; /* lines per page */
char *clear; /* clear screen */
char *erase_line; /* erase line */
char *enter_std; /* enter standout mode */
char *exit_std; /* exit standout mode */
char *backspace_ch; /* backspace character */
char *go_home; /* go to home */
char *move_line_down; /* move line down */
char *clear_rest; /* clear rest of screen */
int num_columns; /* number of columns */
char *next_search; /* file beginning search string */
char *previous_search; /* previous search() buf[] item */
struct {
off_t row_num; /* row file position */
long line_num; /* line number */
} context,
screen_start;
unsigned int leading_number; /* number in front of key command */
struct number_command previous_command; /* previous key command */
char *shell_line; /* line to execute in subshell */
#ifdef HAVE_MAGIC
magic_t magic; /* libmagic database entries */
#endif
unsigned int
bad_stdout:1, /* true if overwriting does not turn off standout */
catch_suspend:1, /* we should catch the SIGTSTP signal */
clear_line_ends:1, /* do not scroll, paint each screen from the top */
clear_first:1, /* is first character in file \f */
dumb_tty:1, /* is terminal type known */
eat_newline:1, /* is newline ignored after 80 cols */
erase_input_ok:1, /* is erase input supported */
erase_previous_ok:1, /* is erase previous supported */
first_file:1, /* is the input file the first in list */
fold_long_lines:1, /* fold long lines */
hard_tabs:1, /* print spaces instead of '\t' */
hard_tty:1, /* is this hard copy terminal (a printer or such) */
leading_colon:1, /* key command has leading ':' character */
is_paused:1, /* is output paused */
no_quit_dialog:1, /* suppress quit dialog */
no_scroll:1, /* do not scroll, clear the screen and then display text */
no_tty_in:1, /* is input in interactive mode */
no_tty_out:1, /* is output in interactive mode */
print_banner:1, /* print file name banner */
reading_num:1, /* are we reading leading_number */
report_errors:1, /* is an error reported */
search_at_start:1, /* search pattern defined at start up */
search_called:1, /* previous more command was a search */
squeeze_spaces:1, /* suppress white space */
stdout_glitch:1, /* terminal has standout mode glitch */
stop_after_formfeed:1, /* stop after form feeds */
suppress_bell:1, /* suppress bell */
wrap_margin:1; /* set if automargins */
};
static void __attribute__((__noreturn__)) usage(void)
{
printf("%s", USAGE_HEADER);
printf(_(" %s [options] <file>...\n"), program_invocation_short_name);
printf("%s", USAGE_SEPARATOR);
printf("%s\n", _("A file perusal filter for CRT viewing."));
printf("%s", USAGE_OPTIONS);
printf("%s\n", _(" -d, --silent display help instead of ringing bell"));
printf("%s\n", _(" -f, --logical count logical rather than screen lines"));
printf("%s\n", _(" -l, --no-pause suppress pause after form feed"));
printf("%s\n", _(" -c, --print-over do not scroll, display text and clean line ends"));
printf("%s\n", _(" -p, --clean-print do not scroll, clean screen and display text"));
printf("%s\n", _(" -s, --squeeze squeeze multiple blank lines into one"));
printf("%s\n", _(" -u, --plain suppress underlining and bold"));
printf("%s\n", _(" -n, --lines <number> the number of lines per screenful"));
printf("%s\n", _(" -<number> same as --lines"));
printf("%s\n", _(" +<number> display file beginning from line number"));
printf("%s\n", _(" +/<pattern> display file beginning from pattern match"));
printf("%s", USAGE_SEPARATOR);
printf(USAGE_HELP_OPTIONS(23));
printf(USAGE_MAN_TAIL("more(1)"));
exit(EXIT_SUCCESS);
}
static void argscan(struct more_control *ctl, int as_argc, char **as_argv)
{
int c, opt;
static const struct option longopts[] = {
{ "silent", no_argument, NULL, 'd' },
{ "logical", no_argument, NULL, 'f' },
{ "no-pause", no_argument, NULL, 'l' },
{ "print-over", no_argument, NULL, 'c' },
{ "clean-print", no_argument, NULL, 'p' },
{ "squeeze", no_argument, NULL, 's' },
{ "plain", no_argument, NULL, 'u' },
{ "lines", required_argument, NULL, 'n' },
{ "version", no_argument, NULL, 'V' },
{ "help", no_argument, NULL, 'h' },
{ NULL, 0, NULL, 0 }
};
/* Take care of number option and +args. */
for (opt = 0; opt < as_argc; opt++) {
int move = 0;
if (as_argv[opt][0] == '-' && isdigit_string(as_argv[opt] + 1)) {
ctl->lines_per_screen =
strtos16_or_err(as_argv[opt], _("failed to parse number"));
ctl->lines_per_screen = abs(ctl->lines_per_screen);
move = 1;
} else if (as_argv[opt][0] == '+') {
if (isdigit_string(as_argv[opt] + 1)) {
ctl->next_jump = strtos32_or_err(as_argv[opt],
_("failed to parse number")) - 1;
move = 1;
} else if (as_argv[opt][1] == '/') {
free(ctl->next_search);
ctl->next_search = xstrdup(as_argv[opt] + 2);
ctl->search_at_start = 1;
move = 1;
}
}
if (move) {
as_argc = remote_entry(as_argv, opt, as_argc);
opt--;
}
}
while ((c = getopt_long(as_argc, as_argv, "dflcpsun:eVh", longopts, NULL)) != -1) {
switch (c) {
case 'd':
ctl->suppress_bell = 1;
break;
case 'l':
ctl->stop_after_formfeed = 0;
break;
case 'f':
ctl->fold_long_lines = 0;
break;
case 'p':
ctl->no_scroll = 1;
break;
case 'c':
ctl->clear_line_ends = 1;
break;
case 's':
ctl->squeeze_spaces = 1;
break;
case 'u':
break;
case 'n':
ctl->lines_per_screen = strtou16_or_err(optarg, _("argument error"));
break;
case 'e': /* ignored silently to be posix compliant */
break;
case 'V':
print_version(EXIT_SUCCESS);
case 'h':
usage();
default:
errtryhelp(EXIT_FAILURE);
break;
}
}
ctl->num_files = as_argc - optind;
ctl->file_names = as_argv + optind;
}
static void env_argscan(struct more_control *ctl, const char *s)
{
char **env_argv;
int env_argc = 1;
int size = 8;
const char delim[] = { ' ', '\n', '\t', '\0' };
char *str = xstrdup(s);
char *key = NULL, *tok;
env_argv = xmalloc(sizeof(char *) * size);
env_argv[0] = _("MORE environment variable"); /* program name */
for (tok = strtok_r(str, delim, &key); tok; tok = strtok_r(NULL, delim, &key)) {
env_argv[env_argc++] = tok;
if (size < env_argc) {
size *= 2;
env_argv = xrealloc(env_argv, sizeof(char *) * size);
}
}
argscan(ctl, env_argc, env_argv);
/* Reset optind, command line parsing needs this. */
optind = 0;
free(str);
free(env_argv);
}
static void more_fseek(struct more_control *ctl, off_t pos)
{
ctl->file_position = pos;
fseeko(ctl->current_file, pos, SEEK_SET);
}
static int more_getc(struct more_control *ctl)
{
int ret = getc(ctl->current_file);
ctl->file_position = ftello(ctl->current_file);
return ret;
}
static int more_ungetc(struct more_control *ctl, int c)
{
int ret = ungetc(c, ctl->current_file);
ctl->file_position = ftello(ctl->current_file);
return ret;
}
static void print_separator(const int c, int n)
{
while (n--)
putchar(c);
putchar('\n');
}
/* check_magic -- check for file magic numbers. */
static int check_magic(struct more_control *ctl, char *fs)
{
#ifdef HAVE_MAGIC
const int fd = fileno(ctl->current_file);
const char *mime_encoding = magic_descriptor(ctl->magic, fd);
const char *magic_error_msg = magic_error(ctl->magic);
if (magic_error_msg) {
printf("%s: %s: %s\n", program_invocation_short_name,
_("magic failed"), magic_error_msg);
return 0;
}
if (!mime_encoding || !(strcmp("binary", mime_encoding))) {
printf(_("\n******** %s: Not a text file ********\n\n"), fs);
return 1;
}
#else
signed char twobytes[2];
/* don't try to look ahead if the input is unseekable */
if (fseek(ctl->current_file, 0L, SEEK_SET))
return 0;
if (fread(twobytes, 2, 1, ctl->current_file) == 1) {
switch (twobytes[0] + (twobytes[1] << 8)) {
case 0407: /* a.out obj */
case 0410: /* a.out exec */
case 0413: /* a.out demand exec */
case 0405:
case 0411:
case 0177545:
case 0x457f: /* simple ELF detection */
printf(_("\n******** %s: Not a text file ********\n\n"),
fs);
return 1;
}
}
fseek(ctl->current_file, 0L, SEEK_SET); /* rewind() not necessary */
#endif
return 0;
}
/* Check whether the file named by fs is an ASCII file which the user may
* access. If it is, return the opened file. Otherwise return NULL. */
static void checkf(struct more_control *ctl, char *fs)
{
struct stat st;
int c;
ctl->current_line = 0;
ctl->file_position = 0;
fflush(NULL);
ctl->current_file = fopen(fs, "r");
if (ctl->current_file == NULL) {
if (ctl->clear_line_ends)
putp(ctl->erase_line);
warn(_("cannot open %s"), fs);
return;
}
if (fstat(fileno(ctl->current_file), &st) != 0) {
warn(_("cannot stat %s"), fs);
return;
}
if ((st.st_mode & S_IFMT) == S_IFDIR) {
printf(_("\n*** %s: directory ***\n\n"), fs);
ctl->current_file = NULL;
return;
}
if (st.st_size == 0) {
return;
}
if (check_magic(ctl, fs)) {
fclose(ctl->current_file);
ctl->current_file = NULL;
return;
}
fcntl(fileno(ctl->current_file), F_SETFD, FD_CLOEXEC);
c = more_getc(ctl);
ctl->clear_first = (c == '\f');
more_ungetc(ctl, c);
if ((ctl->file_size = st.st_size) == 0)
ctl->file_size = ~((off_t)0);
}
static void prepare_line_buffer(struct more_control *ctl)
{
size_t sz = ctl->num_columns * 4;
if (ctl->line_sz >= sz)
return;
if (sz < MIN_LINE_SZ)
sz = MIN_LINE_SZ;
/* alloc sz and extra space for \n\0 */
ctl->line_buf = xrealloc(ctl->line_buf, sz + 2);
ctl->line_sz = sz;
}
/* Get a logical line */
static int get_line(struct more_control *ctl, int *length)
{
int c;
char *p;
int column;
static int column_wrap;
#ifdef HAVE_WIDECHAR
size_t i;
wchar_t wc;
int wc_width;
mbstate_t state, state_bak; /* Current status of the stream. */
char mbc[MB_LEN_MAX]; /* Buffer for one multibyte char. */
size_t mblength; /* Byte length of multibyte char. */
size_t mbc_pos = 0; /* Position of the MBC. */
int use_mbc_buffer_flag = 0; /* If 1, mbc has data. */
int break_flag = 0; /* If 1, exit while(). */
off_t file_position_bak = ctl->file_position;
memset(&state, '\0', sizeof(mbstate_t));
#endif
p = ctl->line_buf;
column = 0;
c = more_getc(ctl);
if (column_wrap && c == '\n') {
ctl->current_line++;
c = more_getc(ctl);
}
while (p < &ctl->line_buf[ctl->line_sz - 1]) {
#ifdef HAVE_WIDECHAR
if (ctl->fold_long_lines && use_mbc_buffer_flag && MB_CUR_MAX > 1) {
use_mbc_buffer_flag = 0;
state_bak = state;
mbc[mbc_pos++] = c;
process_mbc:
mblength = mbrtowc(&wc, mbc, mbc_pos, &state);
switch (mblength) {
case (size_t)-2: /* Incomplete multibyte character. */
use_mbc_buffer_flag = 1;
state = state_bak;
break;
case (size_t)-1: /* Invalid as a multibyte character. */
*p++ = mbc[0];
state = state_bak;
column++;
file_position_bak++;
if (column >= ctl->num_columns) {
more_fseek(ctl, file_position_bak);
} else {
memmove(mbc, mbc + 1, --mbc_pos);
if (mbc_pos > 0) {
mbc[mbc_pos] = '\0';
goto process_mbc;
}
}
break;
default:
wc_width = wcwidth(wc);
if (column + wc_width > ctl->num_columns) {
more_fseek(ctl, file_position_bak);
break_flag = 1;
} else {
for (i = 0; p < &ctl->line_buf[ctl->line_sz - 1] &&
i < mbc_pos; i++)
*p++ = mbc[i];
if (wc_width > 0)
column += wc_width;
}
}
if (break_flag || column >= ctl->num_columns)
break;
c = more_getc(ctl);
continue;
}
#endif /* HAVE_WIDECHAR */
if (c == EOF) {
if (p > ctl->line_buf) {
*p = '\0';
*length = p - ctl->line_buf;
return column;
}
*length = p - ctl->line_buf;
return EOF;
}
if (c == '\n') {
ctl->current_line++;
break;
}
*p++ = c;
if (c == '\t') {
if (!ctl->hard_tabs || (column < ctl->prompt_len && !ctl->hard_tty)) {
if (ctl->hard_tabs && ctl->erase_line && !ctl->dumb_tty) {
column = 1 + (column | 7);
putp(ctl->erase_line);
ctl->prompt_len = 0;
} else {
for (--p; p < &ctl->line_buf[ctl->line_sz - 1];) {
*p++ = ' ';
if ((++column & 7) == 0)
break;
}
if (column >= ctl->prompt_len)
ctl->prompt_len = 0;
}
} else
column = 1 + (column | 7);
} else if (c == '\b' && column > 0) {
column--;
} else if (c == '\r') {
int next = more_getc(ctl);
if (next == '\n') {
p--;
ctl->current_line++;
break;
}
more_ungetc(ctl, c);
column = 0;
} else if (c == '\f' && ctl->stop_after_formfeed) {
p[-1] = '^';
*p++ = 'L';
column += 2;
ctl->is_paused = 1;
} else if (c == EOF) {
*length = p - ctl->line_buf;
return column;
} else {
#ifdef HAVE_WIDECHAR
if (ctl->fold_long_lines && MB_CUR_MAX > 1) {
memset(mbc, '\0', MB_LEN_MAX);
mbc_pos = 0;
mbc[mbc_pos++] = c;
state_bak = state;
mblength = mbrtowc(&wc, mbc, mbc_pos, &state);
/* The value of mblength is always less than 2 here. */
switch (mblength) {
case (size_t)-2:
p--;
file_position_bak = ctl->file_position - 1;
state = state_bak;
use_mbc_buffer_flag = 1;
break;
case (size_t)-1:
state = state_bak;
column++;
break;
default:
wc_width = wcwidth(wc);
if (wc_width > 0)
column += wc_width;
}
} else
#endif /* HAVE_WIDECHAR */
{
if (isprint(c))
column++;
}
}
if (column >= ctl->num_columns && ctl->fold_long_lines)
break;
#ifdef HAVE_WIDECHAR
if (use_mbc_buffer_flag == 0 && p >= &ctl->line_buf[ctl->line_sz - 1 - 4])
/* don't read another char if there is no space for
* whole multibyte sequence */
break;
#endif
c = more_getc(ctl);
}
if (column >= ctl->num_columns && ctl->num_columns > 0) {
if (!ctl->wrap_margin) {
*p++ = '\n';
}
}
column_wrap = column == ctl->num_columns && ctl->fold_long_lines;
if (column_wrap && ctl->eat_newline && ctl->wrap_margin) {
*p++ = '\n'; /* simulate normal wrap */
}
*length = p - ctl->line_buf;
*p = 0;
return column;
}
/* Erase the rest of the prompt, assuming we are starting at column col. */
static void erase_to_col(struct more_control *ctl, int col)
{
if (ctl->prompt_len == 0)
return;
if (col == 0 && ctl->clear_line_ends)
puts(ctl->erase_line);
else if (ctl->hard_tty)
putchar('\n');
else {
if (col == 0)
putchar('\r');
if (!ctl->dumb_tty && ctl->erase_line)
putp(ctl->erase_line);
else {
printf("%*s", ctl->prompt_len - col, "");
if (col == 0)
putchar('\r');
}
}
ctl->prompt_len = col;
}
static void output_prompt(struct more_control *ctl, char *filename)
{
if (ctl->clear_line_ends)
putp(ctl->erase_line);
else if (ctl->prompt_len > 0)
erase_to_col(ctl, 0);
if (!ctl->hard_tty) {
ctl->prompt_len = 0;
if (ctl->enter_std) {
putp(ctl->enter_std);
ctl->prompt_len += (2 * ctl->stdout_glitch);
}
if (ctl->clear_line_ends)
putp(ctl->erase_line);
ctl->prompt_len += printf(_("--More--"));
if (filename != NULL) {
ctl->prompt_len += printf(_("(Next file: %s)"), filename);
} else if (!ctl->no_tty_in && 0 < ctl->file_size) {
ctl->prompt_len +=
printf("(%d%%)",
(int)((ctl->file_position * 100) / ctl->file_size));
}
if (ctl->suppress_bell) {
ctl->prompt_len +=
printf(_("[Press space to continue, 'q' to quit.]"));
}
if (ctl->exit_std)
putp(ctl->exit_std);
if (ctl->clear_line_ends)
putp(ctl->clear_rest);
} else
fprintf(stderr, "\a");
fflush(NULL);
}
static void reset_tty(struct more_control *ctl)
{
if (ctl->no_tty_out)
return;
fflush(NULL);
ctl->output_tty.c_lflag |= ICANON | ECHO;
ctl->output_tty.c_cc[VMIN] = ctl->original_tty.c_cc[VMIN];
ctl->output_tty.c_cc[VTIME] = ctl->original_tty.c_cc[VTIME];
tcsetattr(STDERR_FILENO, TCSANOW, &ctl->original_tty);
}
/* Clean up terminal state and exit. Also come here if interrupt signal received */
static void __attribute__((__noreturn__)) more_exit(struct more_control *ctl)
{
#ifdef HAVE_MAGIC
magic_close(ctl->magic);
#endif
reset_tty(ctl);
if (ctl->clear_line_ends) {
putchar('\r');
putp(ctl->erase_line);
} else if (!ctl->clear_line_ends && (ctl->prompt_len > 0))
erase_to_col(ctl, 0);
fflush(NULL);
free(ctl->previous_search);
free(ctl->shell_line);
free(ctl->line_buf);
free(ctl->go_home);
if (ctl->current_file)
fclose(ctl->current_file);
del_curterm(cur_term);
_exit(EXIT_SUCCESS);
}
static cc_t read_user_input(struct more_control *ctl)
{
cc_t c;
errno = 0;
/*
* Key commands can be read() from either stderr or stdin. If they
* are read from stdin such as 'cat file.txt | more' then the pipe
* input is understood as series key commands - and that is not
* wanted. Keep the read() reading from stderr.
*/
if (read(STDERR_FILENO, &c, 1) <= 0) {
if (errno != EINTR)
more_exit(ctl);
else
c = ctl->output_tty.c_cc[VKILL];
}
return c;
}
/* Read a number and command from the terminal. Set cmd to the non-digit
* which terminates the number. */
static struct number_command read_command(struct more_control *ctl)
{
cc_t input[8] = { 0 };
ssize_t i, ilen;
struct number_command cmd = { .key = more_kc_unknown_command };
/* See stderr note in read_user_input() */
if ((ilen = read(STDERR_FILENO, &input, sizeof(input))) <= 0)
return cmd;
if (2 < ilen) {
if (!memcmp(input, ARROW_UP, sizeof(ARROW_UP))) {
cmd.key = more_kc_backwards;
return cmd;
} else if (!memcmp(input, ARROW_DOWN, sizeof(ARROW_DOWN))) {
cmd.key = more_kc_jump_lines_per_screen;
return cmd;
} else if (!memcmp(input, PAGE_UP, sizeof(PAGE_UP))) {
cmd.key = more_kc_backwards;
return cmd;
} else if (!memcmp(input, PAGE_DOWN, sizeof(PAGE_DOWN))) {
cmd.key = more_kc_jump_lines_per_screen;
return cmd;
}
}
for (i = 0; i < ilen; i++) {
if (isdigit(input[i])) {
if (0 < ctl->reading_num) {
ctl->leading_number *= 10;
ctl->leading_number += input[i] - '0';
} else
ctl->leading_number = input[i] - '0';
ctl->reading_num = 1;
continue;
}
cmd.number = ctl->leading_number;
ctl->reading_num = 0;
ctl->leading_number = 0;
if (ctl->leading_colon) {
ctl->leading_colon = 0;
switch (input[i]) {
case 'f':
cmd.key = more_kc_display_file_and_line;
return cmd;
case 'n':
cmd.key = more_kc_next_file;
return cmd;
case 'p':
cmd.key = more_kc_previous_file;
return cmd;
default:
cmd.key = more_kc_unknown_command;
return cmd;
}
}
/* command is a single char */
switch (input[i]) {
case '.':
cmd.key = more_kc_repeat_previous;
break;
case ':':
ctl->leading_colon = 1;
break;
case 'b':
case CTRL('B'):
cmd.key = more_kc_backwards;
break;
case ' ':
cmd.key = more_kc_jump_lines_per_screen;
break;
case 'z':
cmd.key = more_kc_set_lines_per_screen;
break;
case 'd':
case CTRL('D'):
cmd.key = more_kc_set_scroll_len;
break;
case 'q':
case 'Q':
cmd.key = more_kc_quit;
break;
case 'f':
case CTRL('F'):
cmd.key = more_kc_skip_forward_screen;
break;
case 's':
cmd.key = more_kc_skip_forward_line;
break;
case '\n':
cmd.key = more_kc_next_line;
break;
case '\f':
cmd.key = more_kc_clear_screen;
break;
case '\'':
cmd.key = more_kc_previous_search_match;
break;
case '=':
cmd.key = more_kc_display_line;
break;
case 'n':
cmd.key = more_kc_repeat_search;
break;
case '/':
cmd.key = more_kc_search;
break;
case '!':
cmd.key = more_kc_run_shell;
break;
case '?':
case 'h':
cmd.key = more_kc_help;
break;
case 'v':
cmd.key = more_kc_run_editor;
break;
}
}
return cmd;
}
/* Change displayed file from command line list to next nskip, where nskip
* is relative position in argv and can be negative, that is a previous
* file. */
static void change_file(struct more_control *ctl, int nskip)
{
if (nskip == 0)
return;
if (nskip > 0) {
if (ctl->argv_position + nskip > ctl->num_files - 1)
nskip = ctl->num_files - ctl->argv_position - 1;
}
ctl->argv_position += nskip;
if (ctl->argv_position < 0)
ctl->argv_position = 0;
puts(_("\n...Skipping "));
if (ctl->clear_line_ends)
putp(ctl->erase_line);
if (nskip > 0)
fputs(_("...Skipping to file "), stdout);
else
fputs(_("...Skipping back to file "), stdout);
puts(ctl->file_names[ctl->argv_position]);
if (ctl->clear_line_ends)
putp(ctl->erase_line);
putchar('\n');
ctl->argv_position--;
}
static void show(struct more_control *ctl, char c)
{
if ((c < ' ' && c != '\n' && c != ESC) || c == CERASE) {
c += (c == CERASE) ? -0100 : 0100;
fputs(CARAT, stderr);
ctl->prompt_len++;
}
fputc(c, stderr);
ctl->prompt_len++;
}
static void more_error(struct more_control *ctl, char *mess)
{
if (ctl->clear_line_ends)
putp(ctl->erase_line);
else
erase_to_col(ctl, 0);
ctl->prompt_len += strlen(mess);
if (ctl->enter_std)
putp(ctl->enter_std);
fputs(mess, stdout);
if (ctl->exit_std)
putp(ctl->exit_std);
fflush(NULL);
ctl->report_errors++;
}
static void erase_one_column(struct more_control *ctl)
{
if (ctl->erase_previous_ok)
fprintf(stderr, "%s ", ctl->backspace_ch);
fputs(ctl->backspace_ch, stderr);
}
static void ttyin(struct more_control *ctl, char buf[], int nmax, char pchar)
{
char *sp;
cc_t c;
int slash = 0;
int maxlen;
sp = buf;
maxlen = 0;
while (sp - buf < nmax) {
if (ctl->prompt_len > maxlen)
maxlen = ctl->prompt_len;
c = read_user_input(ctl);
if (c == '\\') {
slash++;
} else if (c == ctl->output_tty.c_cc[VERASE] && !slash) {
if (sp > buf) {
#ifdef HAVE_WIDECHAR
if (MB_CUR_MAX > 1) {
wchar_t wc;
size_t pos = 0, mblength;
mbstate_t state, state_bak;
memset(&state, '\0', sizeof(mbstate_t));
while (1) {
state_bak = state;
mblength =
mbrtowc(&wc, buf + pos,
sp - buf, &state);
switch (mblength) {
case (size_t)-2:
case (size_t)-1:
state = state_bak;
/* fallthrough */
case 0:
mblength = 1;
}
if (buf + pos + mblength >= sp)
break;
pos += mblength;
}
if (mblength == 1) {
erase_one_column(ctl);
} else {
int wc_width;
wc_width = wcwidth(wc);
wc_width =
(wc_width <
1) ? 1 : wc_width;
while (wc_width--) {
erase_one_column(ctl);
}
}
while (mblength--) {
--ctl->prompt_len;
--sp;
}
} else
#endif /* HAVE_WIDECHAR */
{
--ctl->prompt_len;
erase_one_column(ctl);
--sp;
}
if ((*sp < ' ' && *sp != '\n') || *sp == CERASE) {
--ctl->prompt_len;
erase_one_column(ctl);
}
continue;
}
if (!ctl->erase_line)
ctl->prompt_len = maxlen;
} else if (c == ctl->output_tty.c_cc[VKILL] && !slash) {
if (ctl->hard_tty) {
show(ctl, c);
putchar('\n');
putchar(pchar);
} else {
putchar('\r');
putchar(pchar);
if (ctl->erase_line)
erase_to_col(ctl, 1);
else if (ctl->erase_input_ok)
while (ctl->prompt_len-- > 1)
fprintf(stderr, "%s %s", ctl->backspace_ch, ctl->backspace_ch);
ctl->prompt_len = 1;
}
sp = buf;
fflush(NULL);
continue;
}
if (slash && (c == ctl->output_tty.c_cc[VKILL] ||
c == ctl->output_tty.c_cc[VERASE])) {
erase_one_column(ctl);
--sp;
}
if (c != '\\')
slash = 0;
*sp++ = c;
if ((c < ' ' && c != '\n' && c != ESC) || c == CERASE) {
c += (c == CERASE) ? -0100 : 0100;
fputs(CARAT, stderr);
ctl->prompt_len++;
}
if (c != '\n' && c != ESC) {
fputc(c, stderr);
ctl->prompt_len++;
} else
break;
}
*--sp = '\0';
if (!ctl->erase_line)
ctl->prompt_len = maxlen;
if (sp - buf >= nmax - 1)
more_error(ctl, _("Line too long"));
}
/* Expand shell command line. */
static void expand(struct more_control *ctl, char *inbuf)
{
char *inpstr;
char *outstr;
char c;
char *temp;
int tempsz, xtra = 0, offset;
if (!ctl->no_tty_in)
xtra += strlen(ctl->file_names[ctl->argv_position]) + 1;
if (ctl->shell_line)
xtra += strlen(ctl->shell_line) + 1;
tempsz = COMMAND_BUF + xtra;
temp = xmalloc(tempsz);
inpstr = inbuf;
outstr = temp;
while ((c = *inpstr++) != '\0') {
offset = outstr - temp;
if (tempsz - offset - 1 < xtra) {
tempsz += COMMAND_BUF + xtra;
temp = xrealloc(temp, tempsz);
outstr = temp + offset;
}
switch (c) {
case '%':
if (!ctl->no_tty_in) {
strcpy(outstr, ctl->file_names[ctl->argv_position]);
outstr += strlen(ctl->file_names[ctl->argv_position]);
} else
*outstr++ = c;
break;
case '!':
if (ctl->shell_line) {
strcpy(outstr, ctl->shell_line);
outstr += strlen(ctl->shell_line);
} else
more_error(ctl, _
("No previous command to substitute for"));
break;
case '\\':
if (*inpstr == '%' || *inpstr == '!') {
*outstr++ = *inpstr++;
break;
}
/* fallthrough */
default:
*outstr++ = c;
}
}
*outstr++ = '\0';
free(ctl->shell_line);
ctl->shell_line = temp;
}
static void set_tty(struct more_control *ctl)
{
ctl->output_tty.c_lflag &= ~(ICANON | ECHO);
ctl->output_tty.c_cc[VMIN] = 1; /* read at least 1 char */
ctl->output_tty.c_cc[VTIME] = 0; /* no timeout */
tcsetattr(STDERR_FILENO, TCSANOW, &ctl->output_tty);
}
/* Come here if a quit signal is received */
static void sigquit_handler(struct more_control *ctl)
{
if (!ctl->dumb_tty && ctl->no_quit_dialog) {
ctl->prompt_len += fprintf(stderr, _("[Use q or Q to quit]"));
ctl->no_quit_dialog = 0;
} else
more_exit(ctl);
}
/* Come here when we get a suspend signal from the terminal */
static void sigtstp_handler(struct more_control *ctl)
{
reset_tty(ctl);
fflush(NULL);
kill(getpid(), SIGSTOP);
}
/* Come here when we get a continue signal from the terminal */
static void sigcont_handler(struct more_control *ctl)
{
set_tty(ctl);
}
/* Come here if a signal for a window size change is received */
static void sigwinch_handler(struct more_control *ctl)
{
struct winsize win;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) != -1) {
if (win.ws_row != 0) {
ctl->lines_per_page = win.ws_row;
ctl->d_scroll_len = ctl->lines_per_page / 2 - 1;
if (ctl->d_scroll_len < 1)
ctl->d_scroll_len = 1;
ctl->lines_per_screen = ctl->lines_per_page - 1;
}
if (win.ws_col != 0)
ctl->num_columns = win.ws_col;
}
prepare_line_buffer(ctl);
}
static void __attribute__((__format__ (__printf__, 3, 4)))
execute(struct more_control *ctl, char *filename, const char *cmd, ...)
{
pid_t id;
va_list argp;
char *arg;
char **args;
int argcount;
fflush(NULL);
id = fork();
if (id == 0) {
int errsv;
if (!isatty(STDIN_FILENO)) {
close(STDIN_FILENO);
open("/dev/tty", 0);
}
reset_tty(ctl);
va_start(argp, cmd);
arg = va_arg(argp, char *);
argcount = 0;
while (arg) {
argcount++;
arg = va_arg(argp, char *);
}
va_end(argp);
args = alloca(sizeof(char *) * (argcount + 1));
args[argcount] = NULL;
va_start(argp, cmd);
arg = va_arg(argp, char *);
argcount = 0;
while (arg) {
args[argcount] = arg;
argcount++;
arg = va_arg(argp, char *);
}
va_end(argp);
if ((geteuid() != getuid() || getegid() != getgid())
&& drop_permissions() != 0)
err(EXIT_FAILURE, _("drop permissions failed"));
execvp(cmd, args);
errsv = errno;
fputs(_("exec failed\n"), stderr);
exit(errsv == ENOENT ? EX_EXEC_ENOENT : EX_EXEC_FAILED);
}
if (id > 0) {
errno = 0;
while (wait(NULL) > 0) {
if (errno == EINTR)
continue;
}
} else
fputs(_("can't fork\n"), stderr);
set_tty(ctl);
print_separator('-', 24);
output_prompt(ctl, filename);
}
static void run_shell(struct more_control *ctl, char *filename)
{
char cmdbuf[COMMAND_BUF];
erase_to_col(ctl, 0);
putchar('!');
fflush(NULL);
if (ctl->previous_command.key == more_kc_run_shell && ctl->shell_line)
fputs(ctl->shell_line, stdout);
else {
ttyin(ctl, cmdbuf, sizeof(cmdbuf) - 2, '!');
if (strpbrk(cmdbuf, "%!\\"))
expand(ctl, cmdbuf);
else {
free(ctl->shell_line);
ctl->shell_line = xstrdup(cmdbuf);
}
}
fputc('\n', stderr);
fflush(NULL);
ctl->prompt_len = 0;
execute(ctl, filename, ctl->shell, ctl->shell, "-c", ctl->shell_line, 0);
}
/* Skip n lines in the file f */
static void skip_lines(struct more_control *ctl)
{
int c;
while (ctl->next_jump > 0) {
while ((c = more_getc(ctl)) != '\n')
if (c == EOF)
return;
ctl->next_jump--;
ctl->current_line++;
}
}
/* Clear the screen */
static void more_clear_screen(struct more_control *ctl)
{
if (ctl->clear && !ctl->hard_tty) {
putp(ctl->clear);
/* Put out carriage return so that system doesn't get
* confused by escape sequences when expanding tabs */
putchar('\r');
ctl->prompt_len = 0;
}
}
static void read_line(struct more_control *ctl)
{
int c;
char *p;
p = ctl->line_buf;
while ((c = more_getc(ctl)) != '\n' && c != EOF
&& (ptrdiff_t)p != (ptrdiff_t)(ctl->line_buf + ctl->line_sz - 1))
*p++ = c;
if (c == '\n')
ctl->current_line++;
*p = '\0';
}
static int more_poll(struct more_control *ctl, int timeout)
{
struct pollfd pfd[2];
pfd[0].fd = ctl->sigfd;
pfd[0].events = POLLIN | POLLERR | POLLHUP;
pfd[1].fd = STDIN_FILENO;
pfd[1].events = POLLIN;
if (poll(pfd, 2, timeout) < 0) {
if (errno == EAGAIN)
return 1;
more_error(ctl, _("poll failed"));
return 1;
}
if (pfd[0].revents != 0) {
struct signalfd_siginfo info;
ssize_t sz;
sz = read(pfd[0].fd, &info, sizeof(info));
assert(sz == sizeof(info));
switch (info.ssi_signo) {
case SIGINT:
more_exit(ctl);
break;
case SIGQUIT:
sigquit_handler(ctl);
break;
case SIGTSTP:
sigtstp_handler(ctl);
break;
case SIGCONT:
sigcont_handler(ctl);
break;
case SIGWINCH:
sigwinch_handler(ctl);
break;
default:
abort();
}
}
if (pfd[1].revents == 0)
return 1;
return 0;
}
/* Search for nth occurrence of regular expression contained in buf in
* the file */
static void search(struct more_control *ctl, char buf[], int n)
{
off_t startline = ctl->file_position;
off_t line1 = startline;
off_t line2 = startline;
off_t line3;
int lncount;
int saveln, rc;
regex_t re;
if (buf != ctl->previous_search) {
free(ctl->previous_search);
ctl->previous_search = buf;
}
ctl->search_called = 1;
ctl->context.line_num = saveln = ctl->current_line;
ctl->context.row_num = startline;
lncount = 0;
if (!buf)
goto notfound;
if ((rc = regcomp(&re, buf, REG_NOSUB)) != 0) {
char s[REGERR_BUF];
regerror(rc, &re, s, sizeof s);
more_error(ctl, s);
return;
}
while (!feof(ctl->current_file)) {
line3 = line2;
line2 = line1;
line1 = ctl->file_position;
read_line(ctl);
lncount++;
if (regexec(&re, ctl->line_buf, 0, NULL, 0) == 0 && --n == 0) {
if ((1 < lncount && ctl->no_tty_in) || 3 < lncount) {
putchar('\n');
if (ctl->clear_line_ends)
putp(ctl->erase_line);
fputs(_("...skipping\n"), stdout);
}
if (!ctl->no_tty_in) {
ctl->current_line -= (lncount < 3 ? lncount : 3);
more_fseek(ctl, line3);
if (ctl->no_scroll) {
if (ctl->clear_line_ends) {
putp(ctl->go_home);
putp(ctl->erase_line);
} else
more_clear_screen(ctl);
}
} else {
erase_to_col(ctl, 0);
if (ctl->no_scroll) {
if (ctl->clear_line_ends) {
putp(ctl->go_home);
putp(ctl->erase_line);
} else
more_clear_screen(ctl);
}
puts(ctl->line_buf);
}
break;
}
more_poll(ctl, 1);
}
/* Move ctrl+c signal handling back to more_key_command(). */
signal(SIGINT, SIG_DFL);
sigaddset(&ctl->sigset, SIGINT);
sigprocmask(SIG_BLOCK, &ctl->sigset, NULL);
regfree(&re);
if (feof(ctl->current_file)) {
if (!ctl->no_tty_in) {
ctl->current_line = saveln;
more_fseek(ctl, startline);
} else {
fputs(_("\nPattern not found\n"), stdout);
more_exit(ctl);
}
notfound:
more_error(ctl, _("Pattern not found"));
}
}
static char *find_editor(void)
{
static char *editor;
editor = getenv("VISUAL");
if (editor == NULL || *editor == '\0')
editor = getenv("EDITOR");
if (editor == NULL || *editor == '\0')
editor = _PATH_VI;
return editor;
}
static void runtime_usage(void)
{
fputs(_("Most commands optionally preceded by integer argument k. "
"Defaults in brackets.\n"
"Star (*) indicates argument becomes new default.\n"), stdout);
print_separator('-', 79);
fprintf(stdout,
_
("<space> Display next k lines of text [current screen size]\n"
"z Display next k lines of text [current screen size]*\n"
"<return> Display next k lines of text [1]*\n"
"d or ctrl-D Scroll k lines [current scroll size, initially 11]*\n"
"q or Q or <interrupt> Exit from more\n"
"s Skip forward k lines of text [1]\n"
"f Skip forward k screenfuls of text [1]\n"
"b or ctrl-B Skip backwards k screenfuls of text [1]\n"
"' Go to place where previous search started\n"
"= Display current line number\n"
"/<regular expression> Search for kth occurrence of regular expression [1]\n"
"n Search for kth occurrence of last r.e [1]\n"
"!<cmd> or :!<cmd> Execute <cmd> in a subshell\n"
"v Start up '%s' at current line\n"
"ctrl-L Redraw screen\n"
":n Go to kth next file [1]\n"
":p Go to kth previous file [1]\n"
":f Display current file name and line number\n"
". Repeat previous command\n"),
find_editor());
print_separator('-', 79);
}
static void execute_editor(struct more_control *ctl, char *cmdbuf, char *filename)
{
char *editor, *p;
int split = 0;
int n;
if ((ctl->current_line - ctl->lines_per_screen) < 1)
n = 1;
else
n = ctl->current_line - (ctl->lines_per_screen + 1) / 2;
editor = find_editor();
p = strrchr(editor, '/');
if (p)
p++;
else
p = editor;
/*
* Earlier: call vi +n file. This also works for emacs.
* POSIX: call vi -c n file (when editor is vi or ex).
*/
if (!strcmp(p, "vi") || !strcmp(p, "ex")) {
sprintf(cmdbuf, "-c %d", n);
split = 1;
} else
sprintf(cmdbuf, "+%d", n);
erase_to_col(ctl, 0);
printf("%s %s %s", editor, cmdbuf, ctl->file_names[ctl->argv_position]);
if (split) {
cmdbuf[2] = 0;
execute(ctl, filename, editor, editor,
cmdbuf, cmdbuf + 3,
ctl->file_names[ctl->argv_position], (char *)0);
} else
execute(ctl, filename, editor, editor,
cmdbuf, ctl->file_names[ctl->argv_position], (char *)0);
}
static int skip_backwards(struct more_control *ctl, int nlines)
{
if (nlines == 0)
nlines++;
erase_to_col(ctl, 0);
printf(P_("...back %d page", "...back %d pages", nlines), nlines);
putchar('\n');
ctl->next_jump = ctl->current_line - (ctl->lines_per_screen * (nlines + 1)) - 1;
if (ctl->next_jump < 0)
ctl->next_jump = 0;
more_fseek(ctl, 0);
ctl->current_line = 0;
skip_lines(ctl);
return ctl->lines_per_screen;
}
static int skip_forwards(struct more_control *ctl, int nlines, cc_t comchar)
{
int c;
if (nlines == 0)
nlines++;
if (comchar == 'f')
nlines *= ctl->lines_per_screen;
putchar('\r');
erase_to_col(ctl, 0);
putchar('\n');
if (ctl->clear_line_ends)
putp(ctl->erase_line);
printf(P_("...skipping %d line",
"...skipping %d lines", nlines), nlines);
if (ctl->clear_line_ends)
putp(ctl->erase_line);
putchar('\n');
while (nlines > 0) {
while ((c = more_getc(ctl)) != '\n')
if (c == EOF)
return 0;
ctl->current_line++;
nlines--;
}
return 1;
}
/* Read a command and do it. A command consists of an optional integer
* argument followed by the command character. Return the number of
* lines to display in the next screenful. If there is nothing more to
* display in the current file, zero is returned. */
static int more_key_command(struct more_control *ctl, char *filename)
{
int retval = 0;
int done = 0, search_again = 0;
char cmdbuf[INIT_BUF];
struct number_command cmd;
if (!ctl->report_errors)
output_prompt(ctl, filename);
else
ctl->report_errors = 0;
ctl->search_called = 0;
for (;;) {
if (more_poll(ctl, -1) != 0)
continue;
cmd = read_command(ctl);
if (cmd.key == more_kc_unknown_command)
continue;
if (cmd.key == more_kc_repeat_previous)
cmd = ctl->previous_command;
switch (cmd.key) {
case more_kc_backwards:
if (ctl->no_tty_in) {
fprintf(stderr, "\a");
return -1;
}
retval = skip_backwards(ctl, cmd.number);
done = 1;
break;
case more_kc_jump_lines_per_screen:
case more_kc_set_lines_per_screen:
if (cmd.number == 0)
cmd.number = ctl->lines_per_screen;
else if (cmd.key == more_kc_set_lines_per_screen)
ctl->lines_per_screen = cmd.number;
retval = cmd.number;
done = 1;
break;
case more_kc_set_scroll_len:
if (cmd.number != 0)
ctl->d_scroll_len = cmd.number;
retval = ctl->d_scroll_len;
done = 1;
break;
case more_kc_quit:
more_exit(ctl);
case more_kc_skip_forward_screen:
if (skip_forwards(ctl, cmd.number, 'f'))
retval = ctl->lines_per_screen;
done = 1;
break;
case more_kc_skip_forward_line:
if (skip_forwards(ctl, cmd.number, 's'))
retval = ctl->lines_per_screen;
done = 1;
break;
case more_kc_next_line:
if (cmd.number != 0)
ctl->lines_per_screen = cmd.number;
else
cmd.number = 1;
retval = cmd.number;
done = 1;
break;
case more_kc_clear_screen:
if (!ctl->no_tty_in) {
more_clear_screen(ctl);
more_fseek(ctl, ctl->screen_start.row_num);
ctl->current_line = ctl->screen_start.line_num;
retval = ctl->lines_per_screen;
done = 1;
break;
} else {
fprintf(stderr, "\a");
break;
}
case more_kc_previous_search_match:
if (!ctl->no_tty_in) {
erase_to_col(ctl, 0);
fputs(_("\n***Back***\n\n"), stdout);
more_fseek(ctl, ctl->context.row_num);
ctl->current_line = ctl->context.line_num;
retval = ctl->lines_per_screen;
done = 1;
break;
} else {
fprintf(stderr, "\a");
break;
}
case more_kc_display_line:
erase_to_col(ctl, 0);
ctl->prompt_len = printf("%d", ctl->current_line);
fflush(NULL);
break;
case more_kc_display_file_and_line:
erase_to_col(ctl, 0);
if (!ctl->no_tty_in)
ctl->prompt_len =
printf(_("\"%s\" line %d"),
ctl->file_names[ctl->argv_position], ctl->current_line);
else
ctl->prompt_len = printf(_("[Not a file] line %d"),
ctl->current_line);
fflush(NULL);
break;
case more_kc_repeat_search:
if (!ctl->previous_search) {
more_error(ctl, _("No previous regular expression"));
break;
}
search_again = 1;
/* fallthrough */
case more_kc_search:
if (cmd.number == 0)
cmd.number++;
erase_to_col(ctl, 0);
putchar('/');
ctl->prompt_len = 1;
fflush(NULL);
if (search_again) {
fputc('\r', stderr);
search(ctl, ctl->previous_search, cmd.number);
search_again = 0;
} else {
ttyin(ctl, cmdbuf, sizeof(cmdbuf) - 2, '/');
fputc('\r', stderr);
ctl->next_search = xstrdup(cmdbuf);
search(ctl, ctl->next_search, cmd.number);
}
retval = ctl->lines_per_screen - 1;
done = 1;
break;
case more_kc_run_shell:
run_shell(ctl, filename);
break;
case more_kc_help:
if (ctl->no_scroll)
more_clear_screen(ctl);
erase_to_col(ctl, 0);
runtime_usage();
output_prompt(ctl, filename);
break;
case more_kc_next_file:
putchar('\r');
erase_to_col(ctl, 0);
if (cmd.number == 0)
cmd.number = 1;
if (ctl->argv_position + cmd.number >= (unsigned int)ctl->num_files)
more_exit(ctl);
change_file(ctl, cmd.number);
done = 1;
break;
case more_kc_previous_file:
if (ctl->no_tty_in) {
fprintf(stderr, "\a");
break;
}
putchar('\r');
erase_to_col(ctl, 0);
if (cmd.number == 0)
cmd.number = 1;
change_file(ctl, -cmd.number);
done = 1;
break;
case more_kc_run_editor: /* This case should go right before default */
if (!ctl->no_tty_in) {
execute_editor(ctl, cmdbuf, filename);
break;
}
/* fallthrough */
default:
if (ctl->suppress_bell) {
erase_to_col(ctl, 0);
if (ctl->enter_std)
putp(ctl->enter_std);
ctl->prompt_len =
printf(_("[Press 'h' for instructions.]"))
+ 2 * ctl->stdout_glitch;
if (ctl->exit_std)
putp(ctl->exit_std);
} else
fprintf(stderr, "\a");
fflush(NULL);
break;
}
ctl->previous_command = cmd;
if (done) {
cmd.key = more_kc_unknown_command;
break;
}
}
putchar('\r');
ctl->no_quit_dialog = 1;
return retval;
}
/* Print out the contents of the file f, one screenful at a time. */
static void screen(struct more_control *ctl, int num_lines)
{
int c;
int nchars;
int length; /* length of current line */
static int prev_len = 1; /* length of previous line */
for (;;) {
while (num_lines > 0 && !ctl->is_paused) {
if ((nchars = get_line(ctl, &length)) == EOF) {
if (ctl->clear_line_ends)
putp(ctl->clear_rest);
return;
}
if (ctl->squeeze_spaces && length == 0 && prev_len == 0)
continue;
prev_len = length;
if (ctl->bad_stdout
|| ((ctl->enter_std && *ctl->enter_std == ' ') && (ctl->prompt_len > 0)))
erase_to_col(ctl, 0);
/* must clear before drawing line since tabs on
* some terminals do not erase what they tab
* over. */
if (ctl->clear_line_ends)
putp(ctl->erase_line);
fwrite(ctl->line_buf, length, 1, stdout);
if (nchars < ctl->prompt_len)
erase_to_col(ctl, nchars);
ctl->prompt_len = 0;
if (nchars < ctl->num_columns || !ctl->fold_long_lines)
putchar('\n');
num_lines--;
}
fflush(NULL);
if ((c = more_getc(ctl)) == EOF) {
if (ctl->clear_line_ends)
putp(ctl->clear_rest);
return;
}
if (ctl->is_paused && ctl->clear_line_ends)
putp(ctl->clear_rest);
more_ungetc(ctl, c);
ctl->is_paused = 0;
do {
if ((num_lines = more_key_command(ctl, NULL)) == 0)
return;
} while (ctl->search_called && !ctl->previous_search);
if (ctl->hard_tty && ctl->prompt_len > 0)
erase_to_col(ctl, 0);
if (ctl->no_scroll && num_lines >= ctl->lines_per_screen) {
if (ctl->clear_line_ends)
putp(ctl->go_home);
else
more_clear_screen(ctl);
}
ctl->screen_start.line_num = ctl->current_line;
ctl->screen_start.row_num = ctl->file_position;
}
}
static void copy_file(FILE *f)
{
char buf[BUFSIZ];
size_t sz;
while ((sz = fread(&buf, sizeof(char), sizeof(buf), f)) > 0)
fwrite(&buf, sizeof(char), sz, stdout);
}
static void display_file(struct more_control *ctl, int left)
{
if (!ctl->current_file)
return;
ctl->context.line_num = ctl->context.row_num = 0;
ctl->current_line = 0;
if (ctl->first_file) {
ctl->first_file = 0;
if (ctl->next_jump)
skip_lines(ctl);
if (ctl->search_at_start) {
search(ctl, ctl->next_search, 1);
if (ctl->no_scroll)
left--;
}
} else if (ctl->argv_position < ctl->num_files && !ctl->no_tty_out)
left =
more_key_command(ctl, ctl->file_names[ctl->argv_position]);
if (left != 0) {
if ((ctl->no_scroll || ctl->clear_first)
&& ctl->file_size != ~((off_t)0)) {
if (ctl->clear_line_ends)
putp(ctl->go_home);
else
more_clear_screen(ctl);
}
if (ctl->print_banner) {
if (ctl->bad_stdout)
erase_to_col(ctl, 0);
if (ctl->clear_line_ends)
putp(ctl->erase_line);
if (ctl->prompt_len > 14)
erase_to_col(ctl, 14);
if (ctl->clear_line_ends)
putp(ctl->erase_line);
print_separator(':', 14);
puts(ctl->file_names[ctl->argv_position]);
if (ctl->clear_line_ends)
putp(ctl->erase_line);
print_separator(':', 14);
if (left > ctl->lines_per_page - 4)
left = ctl->lines_per_page - 4;
}
if (ctl->no_tty_out)
copy_file(ctl->current_file);
else
screen(ctl, left);
}
fflush(NULL);
fclose(ctl->current_file);
ctl->current_file = NULL;
ctl->screen_start.line_num = ctl->screen_start.row_num = 0;
ctl->context.line_num = ctl->context.row_num = 0L;
}
static void initterm(struct more_control *ctl)
{
int ret;
char *term;
struct winsize win;
char *cursor_addr;
#ifndef NON_INTERACTIVE_MORE
ctl->no_tty_out = tcgetattr(STDOUT_FILENO, &ctl->output_tty);
#endif
ctl->no_tty_in = tcgetattr(STDIN_FILENO, &ctl->output_tty);
tcgetattr(STDERR_FILENO, &ctl->output_tty);
ctl->original_tty = ctl->output_tty;
ctl->hard_tabs = (ctl->output_tty.c_oflag & TABDLY) != TAB3;
if (ctl->no_tty_out)
return;
ctl->output_tty.c_lflag &= ~(ICANON | ECHO);
ctl->output_tty.c_cc[VMIN] = 1;
ctl->output_tty.c_cc[VTIME] = 0;
ctl->erase_previous_ok = (ctl->output_tty.c_cc[VERASE] != 255);
ctl->erase_input_ok = (ctl->output_tty.c_cc[VKILL] != 255);
if ((term = getenv("TERM")) == NULL) {
ctl->dumb_tty = 1;
}
setupterm(term, 1, &ret);
if (ret <= 0) {
ctl->dumb_tty = 1;
return;
}
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) < 0) {
ctl->lines_per_page = tigetnum(TERM_LINES);
ctl->num_columns = tigetnum(TERM_COLS);
} else {
if ((ctl->lines_per_page = win.ws_row) == 0)
ctl->lines_per_page = tigetnum(TERM_LINES);
if ((ctl->num_columns = win.ws_col) == 0)
ctl->num_columns = tigetnum(TERM_COLS);
}
if ((ctl->lines_per_page <= 0) || tigetflag(TERM_HARD_COPY)) {
ctl->hard_tty = 1;
ctl->lines_per_page = LINES_PER_PAGE;
}
if (tigetflag(TERM_EAT_NEW_LINE))
/* Eat newline at last column + 1; dec, concept */
ctl->eat_newline++;
if (ctl->num_columns <= 0)
ctl->num_columns = NUM_COLUMNS;
ctl->wrap_margin = tigetflag(TERM_AUTO_RIGHT_MARGIN);
ctl->bad_stdout = tigetflag(TERM_CEOL);
ctl->erase_line = tigetstr(TERM_CLEAR_TO_LINE_END);
ctl->clear = tigetstr(TERM_CLEAR);
if ((ctl->enter_std = tigetstr(TERM_STANDARD_MODE)) != NULL) {
ctl->exit_std = tigetstr(TERM_EXIT_STANDARD_MODE);
if (0 < tigetnum(TERM_STD_MODE_GLITCH))
ctl->stdout_glitch = 1;
}
cursor_addr = tigetstr(TERM_HOME);
if (cursor_addr == NULL || *cursor_addr == '\0') {
cursor_addr = tigetstr(TERM_CURSOR_ADDRESS);
if (cursor_addr)
cursor_addr = tparm(cursor_addr, 0, 0);
}
if (cursor_addr)
ctl->go_home = xstrdup(cursor_addr);
if ((ctl->move_line_down = tigetstr(TERM_LINE_DOWN)) == NULL)
ctl->move_line_down = BACKSPACE;
ctl->clear_rest = tigetstr(TERM_CLEAR_TO_SCREEN_END);
if ((ctl->backspace_ch = tigetstr(TERM_BACKSPACE)) == NULL)
ctl->backspace_ch = BACKSPACE;
if ((ctl->shell = getenv("SHELL")) == NULL)
ctl->shell = _PATH_BSHELL;
}
int main(int argc, char **argv)
{
char *s;
int left;
struct more_control ctl = {
.first_file = 1,
.fold_long_lines = 1,
.no_quit_dialog = 1,
.stop_after_formfeed = 1,
.wrap_margin = 1,
.lines_per_page = LINES_PER_PAGE,
.num_columns = NUM_COLUMNS,
.d_scroll_len = SCROLL_LEN,
0
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
close_stdout_atexit();
setlocale(LC_ALL, "");
/* Auto set no scroll on when binary is called page */
if (!(strcmp(program_invocation_short_name, "page")))
ctl.no_scroll++;
if ((s = getenv("MORE")) != NULL)
env_argscan(&ctl, s);
argscan(&ctl, argc, argv);
initterm(&ctl);
#ifdef HAVE_MAGIC
ctl.magic = magic_open(MAGIC_MIME_ENCODING | MAGIC_SYMLINK);
magic_load(ctl.magic, NULL);
#endif
prepare_line_buffer(&ctl);
ctl.d_scroll_len = ctl.lines_per_page / 2 - 1;
if (ctl.d_scroll_len <= 0)
ctl.d_scroll_len = 1;
/* allow clear_line_ends only if go_home and erase_line and clear_rest strings are
* defined, and in that case, make sure we are in no_scroll mode */
if (ctl.clear_line_ends) {
if ((ctl.go_home == NULL) || (*ctl.go_home == '\0') ||
(ctl.erase_line == NULL) || (*ctl.erase_line == '\0') ||
(ctl.clear_rest == NULL) || (*ctl.clear_rest == '\0'))
ctl.clear_line_ends = 0;
else
ctl.no_scroll = 1;
}
if (ctl.lines_per_screen == 0)
ctl.lines_per_screen = ctl.lines_per_page - 1;
left = ctl.lines_per_screen;
if (ctl.num_files > 1)
ctl.print_banner = 1;
if (!ctl.no_tty_in && ctl.num_files == 0) {
warnx(_("bad usage"));
errtryhelp(EXIT_FAILURE);
} else
ctl.current_file = stdin;
if (!ctl.no_tty_out) {
if (signal(SIGTSTP, SIG_IGN) == SIG_DFL) {
ctl.catch_suspend++;
}
tcsetattr(STDERR_FILENO, TCSANOW, &ctl.output_tty);
}
sigemptyset(&ctl.sigset);
sigaddset(&ctl.sigset, SIGINT);
sigaddset(&ctl.sigset, SIGQUIT);
sigaddset(&ctl.sigset, SIGTSTP);
sigaddset(&ctl.sigset, SIGCONT);
sigaddset(&ctl.sigset, SIGWINCH);
sigprocmask(SIG_BLOCK, &ctl.sigset, NULL);
ctl.sigfd = signalfd(-1, &ctl.sigset, SFD_CLOEXEC);
if (ctl.no_tty_in) {
if (ctl.no_tty_out)
copy_file(stdin);
else {
ctl.current_file = stdin;
display_file(&ctl, left);
}
ctl.no_tty_in = 0;
ctl.print_banner = 1;
ctl.first_file = 0;
}
while (ctl.argv_position < ctl.num_files) {
checkf(&ctl, ctl.file_names[ctl.argv_position]);
display_file(&ctl, left);
ctl.first_file = 0;
ctl.argv_position++;
}
ctl.clear_line_ends = 0;
ctl.prompt_len = 0;
more_exit(&ctl);
}