mirror of
https://github.com/sheumann/hush.git
synced 2024-08-27 18:29:23 +00:00
function old new delta xrealloc_vector_helper - 51 +51 create_list 84 99 +15 getopt_main 690 695 +5 passwd_main 1049 1053 +4 get_cached 85 89 +4 msh_main 1377 1380 +3 add_match 42 41 -1 read_lines 720 718 -2 grave 1068 1066 -2 fill_match_lines 143 141 -2 add_to_dirlist 67 65 -2 add_input_file 49 47 -2 act 252 250 -2 fsck_main 2252 2246 -6 man_main 765 757 -8 bb_internal_initgroups 228 220 -8 cut_main 1052 1041 -11 add_edge_to_node 55 43 -12 dpkg_main 3851 3835 -16 ifupdown_main 2202 2178 -24 sort_main 838 812 -26 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 5/15 up/down: 82/-124) Total: -42 bytes
1413 lines
32 KiB
C
1413 lines
32 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini less implementation for busybox
|
|
*
|
|
* Copyright (C) 2005 by Rob Sullivan <cogito.ergo.cogito@gmail.com>
|
|
*
|
|
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
|
|
*/
|
|
|
|
/*
|
|
* TODO:
|
|
* - Add more regular expression support - search modifiers, certain matches, etc.
|
|
* - Add more complex bracket searching - currently, nested brackets are
|
|
* not considered.
|
|
* - Add support for "F" as an input. This causes less to act in
|
|
* a similar way to tail -f.
|
|
* - Allow horizontal scrolling.
|
|
*
|
|
* Notes:
|
|
* - the inp file pointer is used so that keyboard input works after
|
|
* redirected input has been read from stdin
|
|
*/
|
|
|
|
#include <sched.h> /* sched_yield() */
|
|
|
|
#include "libbb.h"
|
|
#if ENABLE_FEATURE_LESS_REGEXP
|
|
#include "xregex.h"
|
|
#endif
|
|
|
|
/* FIXME: currently doesn't work right */
|
|
#undef ENABLE_FEATURE_LESS_FLAGCS
|
|
#define ENABLE_FEATURE_LESS_FLAGCS 0
|
|
|
|
/* The escape codes for highlighted and normal text */
|
|
#define HIGHLIGHT "\033[7m"
|
|
#define NORMAL "\033[0m"
|
|
/* The escape code to clear the screen */
|
|
#define CLEAR "\033[H\033[J"
|
|
/* The escape code to clear to end of line */
|
|
#define CLEAR_2_EOL "\033[K"
|
|
|
|
/* These are the escape sequences corresponding to special keys */
|
|
enum {
|
|
REAL_KEY_UP = 'A',
|
|
REAL_KEY_DOWN = 'B',
|
|
REAL_KEY_RIGHT = 'C',
|
|
REAL_KEY_LEFT = 'D',
|
|
REAL_PAGE_UP = '5',
|
|
REAL_PAGE_DOWN = '6',
|
|
REAL_KEY_HOME = '7', // vt100? linux vt? or what?
|
|
REAL_KEY_END = '8',
|
|
REAL_KEY_HOME_ALT = '1', // ESC [1~ (vt100? linux vt? or what?)
|
|
REAL_KEY_END_ALT = '4', // ESC [4~
|
|
REAL_KEY_HOME_XTERM = 'H',
|
|
REAL_KEY_END_XTERM = 'F',
|
|
|
|
/* These are the special codes assigned by this program to the special keys */
|
|
KEY_UP = 20,
|
|
KEY_DOWN = 21,
|
|
KEY_RIGHT = 22,
|
|
KEY_LEFT = 23,
|
|
PAGE_UP = 24,
|
|
PAGE_DOWN = 25,
|
|
KEY_HOME = 26,
|
|
KEY_END = 27,
|
|
|
|
/* Absolute max of lines eaten */
|
|
MAXLINES = CONFIG_FEATURE_LESS_MAXLINES,
|
|
|
|
/* This many "after the end" lines we will show (at max) */
|
|
TILDES = 1,
|
|
};
|
|
|
|
/* Command line options */
|
|
enum {
|
|
FLAG_E = 1,
|
|
FLAG_M = 1 << 1,
|
|
FLAG_m = 1 << 2,
|
|
FLAG_N = 1 << 3,
|
|
FLAG_TILDE = 1 << 4,
|
|
/* hijack command line options variable for internal state vars */
|
|
LESS_STATE_MATCH_BACKWARDS = 1 << 15,
|
|
};
|
|
|
|
#if !ENABLE_FEATURE_LESS_REGEXP
|
|
enum { pattern_valid = 0 };
|
|
#endif
|
|
|
|
struct globals {
|
|
int cur_fline; /* signed */
|
|
int kbd_fd; /* fd to get input from */
|
|
int less_gets_pos;
|
|
/* last position in last line, taking into account tabs */
|
|
size_t linepos;
|
|
unsigned max_displayed_line;
|
|
unsigned max_fline;
|
|
unsigned max_lineno; /* this one tracks linewrap */
|
|
unsigned width;
|
|
ssize_t eof_error; /* eof if 0, error if < 0 */
|
|
ssize_t readpos;
|
|
ssize_t readeof; /* must be signed */
|
|
const char **buffer;
|
|
const char **flines;
|
|
const char *empty_line_marker;
|
|
unsigned num_files;
|
|
unsigned current_file;
|
|
char *filename;
|
|
char **files;
|
|
#if ENABLE_FEATURE_LESS_MARKS
|
|
unsigned num_marks;
|
|
unsigned mark_lines[15][2];
|
|
#endif
|
|
#if ENABLE_FEATURE_LESS_REGEXP
|
|
unsigned *match_lines;
|
|
int match_pos; /* signed! */
|
|
int wanted_match; /* signed! */
|
|
int num_matches;
|
|
regex_t pattern;
|
|
smallint pattern_valid;
|
|
#endif
|
|
smallint terminated;
|
|
struct termios term_orig, term_less;
|
|
};
|
|
#define G (*ptr_to_globals)
|
|
#define cur_fline (G.cur_fline )
|
|
#define kbd_fd (G.kbd_fd )
|
|
#define less_gets_pos (G.less_gets_pos )
|
|
#define linepos (G.linepos )
|
|
#define max_displayed_line (G.max_displayed_line)
|
|
#define max_fline (G.max_fline )
|
|
#define max_lineno (G.max_lineno )
|
|
#define width (G.width )
|
|
#define eof_error (G.eof_error )
|
|
#define readpos (G.readpos )
|
|
#define readeof (G.readeof )
|
|
#define buffer (G.buffer )
|
|
#define flines (G.flines )
|
|
#define empty_line_marker (G.empty_line_marker )
|
|
#define num_files (G.num_files )
|
|
#define current_file (G.current_file )
|
|
#define filename (G.filename )
|
|
#define files (G.files )
|
|
#define num_marks (G.num_marks )
|
|
#define mark_lines (G.mark_lines )
|
|
#if ENABLE_FEATURE_LESS_REGEXP
|
|
#define match_lines (G.match_lines )
|
|
#define match_pos (G.match_pos )
|
|
#define num_matches (G.num_matches )
|
|
#define wanted_match (G.wanted_match )
|
|
#define pattern (G.pattern )
|
|
#define pattern_valid (G.pattern_valid )
|
|
#endif
|
|
#define terminated (G.terminated )
|
|
#define term_orig (G.term_orig )
|
|
#define term_less (G.term_less )
|
|
#define INIT_G() do { \
|
|
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
|
|
less_gets_pos = -1; \
|
|
empty_line_marker = "~"; \
|
|
num_files = 1; \
|
|
current_file = 1; \
|
|
eof_error = 1; \
|
|
terminated = 1; \
|
|
USE_FEATURE_LESS_REGEXP(wanted_match = -1;) \
|
|
} while (0)
|
|
|
|
/* Reset terminal input to normal */
|
|
static void set_tty_cooked(void)
|
|
{
|
|
fflush(stdout);
|
|
tcsetattr(kbd_fd, TCSANOW, &term_orig);
|
|
}
|
|
|
|
/* Move the cursor to a position (x,y), where (0,0) is the
|
|
top-left corner of the console */
|
|
static void move_cursor(int line, int row)
|
|
{
|
|
printf("\033[%u;%uH", line, row);
|
|
}
|
|
|
|
static void clear_line(void)
|
|
{
|
|
printf("\033[%u;0H" CLEAR_2_EOL, max_displayed_line + 2);
|
|
}
|
|
|
|
static void print_hilite(const char *str)
|
|
{
|
|
printf(HIGHLIGHT"%s"NORMAL, str);
|
|
}
|
|
|
|
static void print_statusline(const char *str)
|
|
{
|
|
clear_line();
|
|
printf(HIGHLIGHT"%.*s"NORMAL, width - 1, str);
|
|
}
|
|
|
|
/* Exit the program gracefully */
|
|
static void less_exit(int code)
|
|
{
|
|
set_tty_cooked();
|
|
clear_line();
|
|
if (code < 0)
|
|
kill_myself_with_sig(- code); /* does not return */
|
|
exit(code);
|
|
}
|
|
|
|
#if ENABLE_FEATURE_LESS_REGEXP
|
|
static void fill_match_lines(unsigned pos);
|
|
#else
|
|
#define fill_match_lines(pos) ((void)0)
|
|
#endif
|
|
|
|
/* Devilishly complex routine.
|
|
*
|
|
* Has to deal with EOF and EPIPE on input,
|
|
* with line wrapping, with last line not ending in '\n'
|
|
* (possibly not ending YET!), with backspace and tabs.
|
|
* It reads input again if last time we got an EOF (thus supporting
|
|
* growing files) or EPIPE (watching output of slow process like make).
|
|
*
|
|
* Variables used:
|
|
* flines[] - array of lines already read. Linewrap may cause
|
|
* one source file line to occupy several flines[n].
|
|
* flines[max_fline] - last line, possibly incomplete.
|
|
* terminated - 1 if flines[max_fline] is 'terminated'
|
|
* (if there was '\n' [which isn't stored itself, we just remember
|
|
* that it was seen])
|
|
* max_lineno - last line's number, this one doesn't increment
|
|
* on line wrap, only on "real" new lines.
|
|
* readbuf[0..readeof-1] - small preliminary buffer.
|
|
* readbuf[readpos] - next character to add to current line.
|
|
* linepos - screen line position of next char to be read
|
|
* (takes into account tabs and backspaces)
|
|
* eof_error - < 0 error, == 0 EOF, > 0 not EOF/error
|
|
*/
|
|
static void read_lines(void)
|
|
{
|
|
#define readbuf bb_common_bufsiz1
|
|
char *current_line, *p;
|
|
int w = width;
|
|
char last_terminated = terminated;
|
|
#if ENABLE_FEATURE_LESS_REGEXP
|
|
unsigned old_max_fline = max_fline;
|
|
time_t last_time = 0;
|
|
unsigned seconds_p1 = 3; /* seconds_to_loop + 1 */
|
|
#endif
|
|
|
|
if (option_mask32 & FLAG_N)
|
|
w -= 8;
|
|
|
|
USE_FEATURE_LESS_REGEXP(again0:)
|
|
|
|
p = current_line = xmalloc(w);
|
|
max_fline += last_terminated;
|
|
if (!last_terminated) {
|
|
const char *cp = flines[max_fline];
|
|
if (option_mask32 & FLAG_N)
|
|
cp += 8;
|
|
strcpy(current_line, cp);
|
|
p += strlen(current_line);
|
|
free((char*)flines[max_fline]);
|
|
/* linepos is still valid from previous read_lines() */
|
|
} else {
|
|
linepos = 0;
|
|
}
|
|
|
|
while (1) { /* read lines until we reach cur_fline or wanted_match */
|
|
*p = '\0';
|
|
terminated = 0;
|
|
while (1) { /* read chars until we have a line */
|
|
char c;
|
|
/* if no unprocessed chars left, eat more */
|
|
if (readpos >= readeof) {
|
|
ndelay_on(0);
|
|
eof_error = safe_read(STDIN_FILENO, readbuf, sizeof(readbuf));
|
|
ndelay_off(0);
|
|
readpos = 0;
|
|
readeof = eof_error;
|
|
if (eof_error <= 0)
|
|
goto reached_eof;
|
|
}
|
|
c = readbuf[readpos];
|
|
/* backspace? [needed for manpages] */
|
|
/* <tab><bs> is (a) insane and */
|
|
/* (b) harder to do correctly, so we refuse to do it */
|
|
if (c == '\x8' && linepos && p[-1] != '\t') {
|
|
readpos++; /* eat it */
|
|
linepos--;
|
|
/* was buggy (p could end up <= current_line)... */
|
|
*--p = '\0';
|
|
continue;
|
|
}
|
|
{
|
|
size_t new_linepos = linepos + 1;
|
|
if (c == '\t') {
|
|
new_linepos += 7;
|
|
new_linepos &= (~7);
|
|
}
|
|
if ((int)new_linepos >= w)
|
|
break;
|
|
linepos = new_linepos;
|
|
}
|
|
/* ok, we will eat this char */
|
|
readpos++;
|
|
if (c == '\n') {
|
|
terminated = 1;
|
|
linepos = 0;
|
|
break;
|
|
}
|
|
/* NUL is substituted by '\n'! */
|
|
if (c == '\0') c = '\n';
|
|
*p++ = c;
|
|
*p = '\0';
|
|
} /* end of "read chars until we have a line" loop */
|
|
/* Corner case: linewrap with only "" wrapping to next line */
|
|
/* Looks ugly on screen, so we do not store this empty line */
|
|
if (!last_terminated && !current_line[0]) {
|
|
last_terminated = 1;
|
|
max_lineno++;
|
|
continue;
|
|
}
|
|
reached_eof:
|
|
last_terminated = terminated;
|
|
flines = xrealloc_vector(flines, 8, max_fline);
|
|
if (option_mask32 & FLAG_N) {
|
|
/* Width of 7 preserves tab spacing in the text */
|
|
flines[max_fline] = xasprintf(
|
|
(max_lineno <= 9999999) ? "%7u %s" : "%07u %s",
|
|
max_lineno % 10000000, current_line);
|
|
free(current_line);
|
|
if (terminated)
|
|
max_lineno++;
|
|
} else {
|
|
flines[max_fline] = xrealloc(current_line, strlen(current_line) + 1);
|
|
}
|
|
if (max_fline >= MAXLINES) {
|
|
eof_error = 0; /* Pretend we saw EOF */
|
|
break;
|
|
}
|
|
if (max_fline > cur_fline + max_displayed_line) {
|
|
#if !ENABLE_FEATURE_LESS_REGEXP
|
|
break;
|
|
#else
|
|
if (wanted_match >= num_matches) { /* goto_match called us */
|
|
fill_match_lines(old_max_fline);
|
|
old_max_fline = max_fline;
|
|
}
|
|
if (wanted_match < num_matches)
|
|
break;
|
|
#endif
|
|
}
|
|
if (eof_error <= 0) {
|
|
if (eof_error < 0) {
|
|
if (errno == EAGAIN) {
|
|
/* not yet eof or error, reset flag (or else
|
|
* we will hog CPU - select() will return
|
|
* immediately */
|
|
eof_error = 1;
|
|
} else {
|
|
print_statusline("read error");
|
|
}
|
|
}
|
|
#if !ENABLE_FEATURE_LESS_REGEXP
|
|
break;
|
|
#else
|
|
if (wanted_match < num_matches) {
|
|
break;
|
|
} else { /* goto_match called us */
|
|
time_t t = time(NULL);
|
|
if (t != last_time) {
|
|
last_time = t;
|
|
if (--seconds_p1 == 0)
|
|
break;
|
|
}
|
|
sched_yield();
|
|
goto again0; /* go loop again (max 2 seconds) */
|
|
}
|
|
#endif
|
|
}
|
|
max_fline++;
|
|
current_line = xmalloc(w);
|
|
p = current_line;
|
|
linepos = 0;
|
|
} /* end of "read lines until we reach cur_fline" loop */
|
|
fill_match_lines(old_max_fline);
|
|
#if ENABLE_FEATURE_LESS_REGEXP
|
|
/* prevent us from being stuck in search for a match */
|
|
wanted_match = -1;
|
|
#endif
|
|
#undef readbuf
|
|
}
|
|
|
|
#if ENABLE_FEATURE_LESS_FLAGS
|
|
/* Interestingly, writing calc_percent as a function saves around 32 bytes
|
|
* on my build. */
|
|
static int calc_percent(void)
|
|
{
|
|
unsigned p = (100 * (cur_fline+max_displayed_line+1) + max_fline/2) / (max_fline+1);
|
|
return p <= 100 ? p : 100;
|
|
}
|
|
|
|
/* Print a status line if -M was specified */
|
|
static void m_status_print(void)
|
|
{
|
|
int percentage;
|
|
|
|
if (less_gets_pos >= 0) /* don't touch statusline while input is done! */
|
|
return;
|
|
|
|
clear_line();
|
|
printf(HIGHLIGHT"%s", filename);
|
|
if (num_files > 1)
|
|
printf(" (file %i of %i)", current_file, num_files);
|
|
printf(" lines %i-%i/%i ",
|
|
cur_fline + 1, cur_fline + max_displayed_line + 1,
|
|
max_fline + 1);
|
|
if (cur_fline >= (int)(max_fline - max_displayed_line)) {
|
|
printf("(END)"NORMAL);
|
|
if (num_files > 1 && current_file != num_files)
|
|
printf(HIGHLIGHT" - next: %s"NORMAL, files[current_file]);
|
|
return;
|
|
}
|
|
percentage = calc_percent();
|
|
printf("%i%%"NORMAL, percentage);
|
|
}
|
|
#endif
|
|
|
|
/* Print the status line */
|
|
static void status_print(void)
|
|
{
|
|
const char *p;
|
|
|
|
if (less_gets_pos >= 0) /* don't touch statusline while input is done! */
|
|
return;
|
|
|
|
/* Change the status if flags have been set */
|
|
#if ENABLE_FEATURE_LESS_FLAGS
|
|
if (option_mask32 & (FLAG_M|FLAG_m)) {
|
|
m_status_print();
|
|
return;
|
|
}
|
|
/* No flags set */
|
|
#endif
|
|
|
|
clear_line();
|
|
if (cur_fline && cur_fline < (int)(max_fline - max_displayed_line)) {
|
|
bb_putchar(':');
|
|
return;
|
|
}
|
|
p = "(END)";
|
|
if (!cur_fline)
|
|
p = filename;
|
|
if (num_files > 1) {
|
|
printf(HIGHLIGHT"%s (file %i of %i)"NORMAL,
|
|
p, current_file, num_files);
|
|
return;
|
|
}
|
|
print_hilite(p);
|
|
}
|
|
|
|
static void cap_cur_fline(int nlines)
|
|
{
|
|
int diff;
|
|
if (cur_fline < 0)
|
|
cur_fline = 0;
|
|
if (cur_fline + max_displayed_line > max_fline + TILDES) {
|
|
cur_fline -= nlines;
|
|
if (cur_fline < 0)
|
|
cur_fline = 0;
|
|
diff = max_fline - (cur_fline + max_displayed_line) + TILDES;
|
|
/* As the number of lines requested was too large, we just move
|
|
to the end of the file */
|
|
if (diff > 0)
|
|
cur_fline += diff;
|
|
}
|
|
}
|
|
|
|
static const char controls[] ALIGN1 =
|
|
/* NUL: never encountered; TAB: not converted */
|
|
/**/"\x01\x02\x03\x04\x05\x06\x07\x08" "\x0a\x0b\x0c\x0d\x0e\x0f"
|
|
"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
|
|
"\x7f\x9b"; /* DEL and infamous Meta-ESC :( */
|
|
static const char ctrlconv[] ALIGN1 =
|
|
/* '\n': it's a former NUL - subst with '@', not 'J' */
|
|
"\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x40\x4b\x4c\x4d\x4e\x4f"
|
|
"\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f";
|
|
|
|
#if ENABLE_FEATURE_LESS_REGEXP
|
|
static void print_found(const char *line)
|
|
{
|
|
int match_status;
|
|
int eflags;
|
|
char *growline;
|
|
regmatch_t match_structs;
|
|
|
|
char buf[width];
|
|
const char *str = line;
|
|
char *p = buf;
|
|
size_t n;
|
|
|
|
while (*str) {
|
|
n = strcspn(str, controls);
|
|
if (n) {
|
|
if (!str[n]) break;
|
|
memcpy(p, str, n);
|
|
p += n;
|
|
str += n;
|
|
}
|
|
n = strspn(str, controls);
|
|
memset(p, '.', n);
|
|
p += n;
|
|
str += n;
|
|
}
|
|
strcpy(p, str);
|
|
|
|
/* buf[] holds quarantined version of str */
|
|
|
|
/* Each part of the line that matches has the HIGHLIGHT
|
|
and NORMAL escape sequences placed around it.
|
|
NB: we regex against line, but insert text
|
|
from quarantined copy (buf[]) */
|
|
str = buf;
|
|
growline = NULL;
|
|
eflags = 0;
|
|
goto start;
|
|
|
|
while (match_status == 0) {
|
|
char *new = xasprintf("%s%.*s"HIGHLIGHT"%.*s"NORMAL,
|
|
growline ? : "",
|
|
match_structs.rm_so, str,
|
|
match_structs.rm_eo - match_structs.rm_so,
|
|
str + match_structs.rm_so);
|
|
free(growline); growline = new;
|
|
str += match_structs.rm_eo;
|
|
line += match_structs.rm_eo;
|
|
eflags = REG_NOTBOL;
|
|
start:
|
|
/* Most of the time doesn't find the regex, optimize for that */
|
|
match_status = regexec(&pattern, line, 1, &match_structs, eflags);
|
|
/* if even "" matches, treat it as "not a match" */
|
|
if (match_structs.rm_so >= match_structs.rm_eo)
|
|
match_status = 1;
|
|
}
|
|
|
|
if (!growline) {
|
|
printf(CLEAR_2_EOL"%s\n", str);
|
|
return;
|
|
}
|
|
printf(CLEAR_2_EOL"%s%s\n", growline, str);
|
|
free(growline);
|
|
}
|
|
#else
|
|
void print_found(const char *line);
|
|
#endif
|
|
|
|
static void print_ascii(const char *str)
|
|
{
|
|
char buf[width];
|
|
char *p;
|
|
size_t n;
|
|
|
|
printf(CLEAR_2_EOL);
|
|
while (*str) {
|
|
n = strcspn(str, controls);
|
|
if (n) {
|
|
if (!str[n]) break;
|
|
printf("%.*s", (int) n, str);
|
|
str += n;
|
|
}
|
|
n = strspn(str, controls);
|
|
p = buf;
|
|
do {
|
|
if (*str == 0x7f)
|
|
*p++ = '?';
|
|
else if (*str == (char)0x9b)
|
|
/* VT100's CSI, aka Meta-ESC. Who's inventor? */
|
|
/* I want to know who committed this sin */
|
|
*p++ = '{';
|
|
else
|
|
*p++ = ctrlconv[(unsigned char)*str];
|
|
str++;
|
|
} while (--n);
|
|
*p = '\0';
|
|
print_hilite(buf);
|
|
}
|
|
puts(str);
|
|
}
|
|
|
|
/* Print the buffer */
|
|
static void buffer_print(void)
|
|
{
|
|
unsigned i;
|
|
|
|
move_cursor(0, 0);
|
|
for (i = 0; i <= max_displayed_line; i++)
|
|
if (pattern_valid)
|
|
print_found(buffer[i]);
|
|
else
|
|
print_ascii(buffer[i]);
|
|
status_print();
|
|
}
|
|
|
|
static void buffer_fill_and_print(void)
|
|
{
|
|
unsigned i;
|
|
for (i = 0; i <= max_displayed_line && cur_fline + i <= max_fline; i++) {
|
|
buffer[i] = flines[cur_fline + i];
|
|
}
|
|
for (; i <= max_displayed_line; i++) {
|
|
buffer[i] = empty_line_marker;
|
|
}
|
|
buffer_print();
|
|
}
|
|
|
|
/* Move the buffer up and down in the file in order to scroll */
|
|
static void buffer_down(int nlines)
|
|
{
|
|
cur_fline += nlines;
|
|
read_lines();
|
|
cap_cur_fline(nlines);
|
|
buffer_fill_and_print();
|
|
}
|
|
|
|
static void buffer_up(int nlines)
|
|
{
|
|
cur_fline -= nlines;
|
|
if (cur_fline < 0) cur_fline = 0;
|
|
read_lines();
|
|
buffer_fill_and_print();
|
|
}
|
|
|
|
static void buffer_line(int linenum)
|
|
{
|
|
if (linenum < 0)
|
|
linenum = 0;
|
|
cur_fline = linenum;
|
|
read_lines();
|
|
if (linenum + max_displayed_line > max_fline)
|
|
linenum = max_fline - max_displayed_line + TILDES;
|
|
if (linenum < 0)
|
|
linenum = 0;
|
|
cur_fline = linenum;
|
|
buffer_fill_and_print();
|
|
}
|
|
|
|
static void open_file_and_read_lines(void)
|
|
{
|
|
if (filename) {
|
|
int fd = xopen(filename, O_RDONLY);
|
|
dup2(fd, 0);
|
|
if (fd) close(fd);
|
|
} else {
|
|
/* "less" with no arguments in argv[] */
|
|
/* For status line only */
|
|
filename = xstrdup(bb_msg_standard_input);
|
|
}
|
|
readpos = 0;
|
|
readeof = 0;
|
|
linepos = 0;
|
|
terminated = 1;
|
|
read_lines();
|
|
}
|
|
|
|
/* Reinitialize everything for a new file - free the memory and start over */
|
|
static void reinitialize(void)
|
|
{
|
|
unsigned i;
|
|
|
|
if (flines) {
|
|
for (i = 0; i <= max_fline; i++)
|
|
free((void*)(flines[i]));
|
|
free(flines);
|
|
flines = NULL;
|
|
}
|
|
|
|
max_fline = -1;
|
|
cur_fline = 0;
|
|
max_lineno = 0;
|
|
open_file_and_read_lines();
|
|
buffer_fill_and_print();
|
|
}
|
|
|
|
static ssize_t getch_nowait(char* input, int sz)
|
|
{
|
|
ssize_t rd;
|
|
struct pollfd pfd[2];
|
|
|
|
pfd[0].fd = STDIN_FILENO;
|
|
pfd[0].events = POLLIN;
|
|
pfd[1].fd = kbd_fd;
|
|
pfd[1].events = POLLIN;
|
|
again:
|
|
tcsetattr(kbd_fd, TCSANOW, &term_less);
|
|
/* NB: select/poll returns whenever read will not block. Therefore:
|
|
* if eof is reached, select/poll will return immediately
|
|
* because read will immediately return 0 bytes.
|
|
* Even if select/poll says that input is available, read CAN block
|
|
* (switch fd into O_NONBLOCK'ed mode to avoid it)
|
|
*/
|
|
rd = 1;
|
|
if (max_fline <= cur_fline + max_displayed_line
|
|
&& eof_error > 0 /* did NOT reach eof yet */
|
|
) {
|
|
/* We are interested in stdin */
|
|
rd = 0;
|
|
}
|
|
/* position cursor if line input is done */
|
|
if (less_gets_pos >= 0)
|
|
move_cursor(max_displayed_line + 2, less_gets_pos + 1);
|
|
fflush(stdout);
|
|
safe_poll(pfd + rd, 2 - rd, -1);
|
|
|
|
input[0] = '\0';
|
|
rd = safe_read(kbd_fd, input, sz); /* NB: kbd_fd is in O_NONBLOCK mode */
|
|
if (rd < 0 && errno == EAGAIN) {
|
|
/* No keyboard input -> we have input on stdin! */
|
|
read_lines();
|
|
buffer_fill_and_print();
|
|
goto again;
|
|
}
|
|
set_tty_cooked();
|
|
return rd;
|
|
}
|
|
|
|
/* Grab a character from input without requiring the return key. If the
|
|
* character is ASCII \033, get more characters and assign certain sequences
|
|
* special return codes. Note that this function works best with raw input. */
|
|
static int less_getch(int pos)
|
|
{
|
|
unsigned char input[16];
|
|
unsigned i;
|
|
|
|
again:
|
|
less_gets_pos = pos;
|
|
memset(input, 0, sizeof(input));
|
|
getch_nowait((char *)input, sizeof(input));
|
|
less_gets_pos = -1;
|
|
|
|
/* Detect escape sequences (i.e. arrow keys) and handle
|
|
* them accordingly */
|
|
if (input[0] == '\033' && input[1] == '[') {
|
|
i = input[2] - REAL_KEY_UP;
|
|
if (i < 4)
|
|
return 20 + i;
|
|
i = input[2] - REAL_PAGE_UP;
|
|
if (i < 4)
|
|
return 24 + i;
|
|
if (input[2] == REAL_KEY_HOME_XTERM)
|
|
return KEY_HOME;
|
|
if (input[2] == REAL_KEY_HOME_ALT)
|
|
return KEY_HOME;
|
|
if (input[2] == REAL_KEY_END_XTERM)
|
|
return KEY_END;
|
|
if (input[2] == REAL_KEY_END_ALT)
|
|
return KEY_END;
|
|
return 0;
|
|
}
|
|
/* Reject almost all control chars */
|
|
i = input[0];
|
|
if (i < ' ' && i != 0x0d && i != 8)
|
|
goto again;
|
|
return i;
|
|
}
|
|
|
|
static char* less_gets(int sz)
|
|
{
|
|
char c;
|
|
unsigned i = 0;
|
|
char *result = xzalloc(1);
|
|
|
|
while (1) {
|
|
c = '\0';
|
|
less_gets_pos = sz + i;
|
|
getch_nowait(&c, 1);
|
|
if (c == 0x0d) {
|
|
result[i] = '\0';
|
|
less_gets_pos = -1;
|
|
return result;
|
|
}
|
|
if (c == 0x7f)
|
|
c = 8;
|
|
if (c == 8 && i) {
|
|
printf("\x8 \x8");
|
|
i--;
|
|
}
|
|
if (c < ' ')
|
|
continue;
|
|
if (i >= width - sz - 1)
|
|
continue; /* len limit */
|
|
bb_putchar(c);
|
|
result[i++] = c;
|
|
result = xrealloc(result, i+1);
|
|
}
|
|
}
|
|
|
|
static void examine_file(void)
|
|
{
|
|
char *new_fname;
|
|
|
|
print_statusline("Examine: ");
|
|
new_fname = less_gets(sizeof("Examine: ") - 1);
|
|
if (!new_fname[0]) {
|
|
status_print();
|
|
err:
|
|
free(new_fname);
|
|
return;
|
|
}
|
|
if (access(new_fname, R_OK) != 0) {
|
|
print_statusline("Cannot read this file");
|
|
goto err;
|
|
}
|
|
free(filename);
|
|
filename = new_fname;
|
|
/* files start by = argv. why we assume that argv is infinitely long??
|
|
files[num_files] = filename;
|
|
current_file = num_files + 1;
|
|
num_files++; */
|
|
files[0] = filename;
|
|
num_files = current_file = 1;
|
|
reinitialize();
|
|
}
|
|
|
|
/* This function changes the file currently being paged. direction can be one of the following:
|
|
* -1: go back one file
|
|
* 0: go to the first file
|
|
* 1: go forward one file */
|
|
static void change_file(int direction)
|
|
{
|
|
if (current_file != ((direction > 0) ? num_files : 1)) {
|
|
current_file = direction ? current_file + direction : 1;
|
|
free(filename);
|
|
filename = xstrdup(files[current_file - 1]);
|
|
reinitialize();
|
|
} else {
|
|
print_statusline(direction > 0 ? "No next file" : "No previous file");
|
|
}
|
|
}
|
|
|
|
static void remove_current_file(void)
|
|
{
|
|
unsigned i;
|
|
|
|
if (num_files < 2)
|
|
return;
|
|
|
|
if (current_file != 1) {
|
|
change_file(-1);
|
|
for (i = 3; i <= num_files; i++)
|
|
files[i - 2] = files[i - 1];
|
|
num_files--;
|
|
} else {
|
|
change_file(1);
|
|
for (i = 2; i <= num_files; i++)
|
|
files[i - 2] = files[i - 1];
|
|
num_files--;
|
|
current_file--;
|
|
}
|
|
}
|
|
|
|
static void colon_process(void)
|
|
{
|
|
int keypress;
|
|
|
|
/* Clear the current line and print a prompt */
|
|
print_statusline(" :");
|
|
|
|
keypress = less_getch(2);
|
|
switch (keypress) {
|
|
case 'd':
|
|
remove_current_file();
|
|
break;
|
|
case 'e':
|
|
examine_file();
|
|
break;
|
|
#if ENABLE_FEATURE_LESS_FLAGS
|
|
case 'f':
|
|
m_status_print();
|
|
break;
|
|
#endif
|
|
case 'n':
|
|
change_file(1);
|
|
break;
|
|
case 'p':
|
|
change_file(-1);
|
|
break;
|
|
case 'q':
|
|
less_exit(EXIT_SUCCESS);
|
|
break;
|
|
case 'x':
|
|
change_file(0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#if ENABLE_FEATURE_LESS_REGEXP
|
|
static void normalize_match_pos(int match)
|
|
{
|
|
if (match >= num_matches)
|
|
match = num_matches - 1;
|
|
if (match < 0)
|
|
match = 0;
|
|
match_pos = match;
|
|
}
|
|
|
|
static void goto_match(int match)
|
|
{
|
|
if (!pattern_valid)
|
|
return;
|
|
if (match < 0)
|
|
match = 0;
|
|
/* Try to find next match if eof isn't reached yet */
|
|
if (match >= num_matches && eof_error > 0) {
|
|
wanted_match = match; /* "I want to read until I see N'th match" */
|
|
read_lines();
|
|
}
|
|
if (num_matches) {
|
|
normalize_match_pos(match);
|
|
buffer_line(match_lines[match_pos]);
|
|
} else {
|
|
print_statusline("No matches found");
|
|
}
|
|
}
|
|
|
|
static void fill_match_lines(unsigned pos)
|
|
{
|
|
if (!pattern_valid)
|
|
return;
|
|
/* Run the regex on each line of the current file */
|
|
while (pos <= max_fline) {
|
|
/* If this line matches */
|
|
if (regexec(&pattern, flines[pos], 0, NULL, 0) == 0
|
|
/* and we didn't match it last time */
|
|
&& !(num_matches && match_lines[num_matches-1] == pos)
|
|
) {
|
|
match_lines = xrealloc_vector(match_lines, 4, num_matches);
|
|
match_lines[num_matches++] = pos;
|
|
}
|
|
pos++;
|
|
}
|
|
}
|
|
|
|
static void regex_process(void)
|
|
{
|
|
char *uncomp_regex, *err;
|
|
|
|
/* Reset variables */
|
|
free(match_lines);
|
|
match_lines = NULL;
|
|
match_pos = 0;
|
|
num_matches = 0;
|
|
if (pattern_valid) {
|
|
regfree(&pattern);
|
|
pattern_valid = 0;
|
|
}
|
|
|
|
/* Get the uncompiled regular expression from the user */
|
|
clear_line();
|
|
bb_putchar((option_mask32 & LESS_STATE_MATCH_BACKWARDS) ? '?' : '/');
|
|
uncomp_regex = less_gets(1);
|
|
if (!uncomp_regex[0]) {
|
|
free(uncomp_regex);
|
|
buffer_print();
|
|
return;
|
|
}
|
|
|
|
/* Compile the regex and check for errors */
|
|
err = regcomp_or_errmsg(&pattern, uncomp_regex, 0);
|
|
free(uncomp_regex);
|
|
if (err) {
|
|
print_statusline(err);
|
|
free(err);
|
|
return;
|
|
}
|
|
|
|
pattern_valid = 1;
|
|
match_pos = 0;
|
|
fill_match_lines(0);
|
|
while (match_pos < num_matches) {
|
|
if ((int)match_lines[match_pos] > cur_fline)
|
|
break;
|
|
match_pos++;
|
|
}
|
|
if (option_mask32 & LESS_STATE_MATCH_BACKWARDS)
|
|
match_pos--;
|
|
|
|
/* It's possible that no matches are found yet.
|
|
* goto_match() will read input looking for match,
|
|
* if needed */
|
|
goto_match(match_pos);
|
|
}
|
|
#endif
|
|
|
|
static void number_process(int first_digit)
|
|
{
|
|
unsigned i;
|
|
int num;
|
|
char num_input[sizeof(int)*4]; /* more than enough */
|
|
char keypress;
|
|
|
|
num_input[0] = first_digit;
|
|
|
|
/* Clear the current line, print a prompt, and then print the digit */
|
|
clear_line();
|
|
printf(":%c", first_digit);
|
|
|
|
/* Receive input until a letter is given */
|
|
i = 1;
|
|
while (i < sizeof(num_input)-1) {
|
|
num_input[i] = less_getch(i + 1);
|
|
if (!num_input[i] || !isdigit(num_input[i]))
|
|
break;
|
|
bb_putchar(num_input[i]);
|
|
i++;
|
|
}
|
|
|
|
/* Take the final letter out of the digits string */
|
|
keypress = num_input[i];
|
|
num_input[i] = '\0';
|
|
num = bb_strtou(num_input, NULL, 10);
|
|
/* on format error, num == -1 */
|
|
if (num < 1 || num > MAXLINES) {
|
|
buffer_print();
|
|
return;
|
|
}
|
|
|
|
/* We now know the number and the letter entered, so we process them */
|
|
switch (keypress) {
|
|
case KEY_DOWN: case 'z': case 'd': case 'e': case ' ': case '\015':
|
|
buffer_down(num);
|
|
break;
|
|
case KEY_UP: case 'b': case 'w': case 'y': case 'u':
|
|
buffer_up(num);
|
|
break;
|
|
case 'g': case '<': case 'G': case '>':
|
|
cur_fline = num + max_displayed_line;
|
|
read_lines();
|
|
buffer_line(num - 1);
|
|
break;
|
|
case 'p': case '%':
|
|
num = num * (max_fline / 100); /* + max_fline / 2; */
|
|
cur_fline = num + max_displayed_line;
|
|
read_lines();
|
|
buffer_line(num);
|
|
break;
|
|
#if ENABLE_FEATURE_LESS_REGEXP
|
|
case 'n':
|
|
goto_match(match_pos + num);
|
|
break;
|
|
case '/':
|
|
option_mask32 &= ~LESS_STATE_MATCH_BACKWARDS;
|
|
regex_process();
|
|
break;
|
|
case '?':
|
|
option_mask32 |= LESS_STATE_MATCH_BACKWARDS;
|
|
regex_process();
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#if ENABLE_FEATURE_LESS_FLAGCS
|
|
static void flag_change(void)
|
|
{
|
|
int keypress;
|
|
|
|
clear_line();
|
|
bb_putchar('-');
|
|
keypress = less_getch(1);
|
|
|
|
switch (keypress) {
|
|
case 'M':
|
|
option_mask32 ^= FLAG_M;
|
|
break;
|
|
case 'm':
|
|
option_mask32 ^= FLAG_m;
|
|
break;
|
|
case 'E':
|
|
option_mask32 ^= FLAG_E;
|
|
break;
|
|
case '~':
|
|
option_mask32 ^= FLAG_TILDE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void show_flag_status(void)
|
|
{
|
|
int keypress;
|
|
int flag_val;
|
|
|
|
clear_line();
|
|
bb_putchar('_');
|
|
keypress = less_getch(1);
|
|
|
|
switch (keypress) {
|
|
case 'M':
|
|
flag_val = option_mask32 & FLAG_M;
|
|
break;
|
|
case 'm':
|
|
flag_val = option_mask32 & FLAG_m;
|
|
break;
|
|
case '~':
|
|
flag_val = option_mask32 & FLAG_TILDE;
|
|
break;
|
|
case 'N':
|
|
flag_val = option_mask32 & FLAG_N;
|
|
break;
|
|
case 'E':
|
|
flag_val = option_mask32 & FLAG_E;
|
|
break;
|
|
default:
|
|
flag_val = 0;
|
|
break;
|
|
}
|
|
|
|
clear_line();
|
|
printf(HIGHLIGHT"The status of the flag is: %u"NORMAL, flag_val != 0);
|
|
}
|
|
#endif
|
|
|
|
static void save_input_to_file(void)
|
|
{
|
|
const char *msg = "";
|
|
char *current_line;
|
|
unsigned i;
|
|
FILE *fp;
|
|
|
|
print_statusline("Log file: ");
|
|
current_line = less_gets(sizeof("Log file: ")-1);
|
|
if (current_line[0]) {
|
|
fp = fopen(current_line, "w");
|
|
if (!fp) {
|
|
msg = "Error opening log file";
|
|
goto ret;
|
|
}
|
|
for (i = 0; i <= max_fline; i++)
|
|
fprintf(fp, "%s\n", flines[i]);
|
|
fclose(fp);
|
|
msg = "Done";
|
|
}
|
|
ret:
|
|
print_statusline(msg);
|
|
free(current_line);
|
|
}
|
|
|
|
#if ENABLE_FEATURE_LESS_MARKS
|
|
static void add_mark(void)
|
|
{
|
|
int letter;
|
|
|
|
print_statusline("Mark: ");
|
|
letter = less_getch(sizeof("Mark: ") - 1);
|
|
|
|
if (isalpha(letter)) {
|
|
/* If we exceed 15 marks, start overwriting previous ones */
|
|
if (num_marks == 14)
|
|
num_marks = 0;
|
|
|
|
mark_lines[num_marks][0] = letter;
|
|
mark_lines[num_marks][1] = cur_fline;
|
|
num_marks++;
|
|
} else {
|
|
print_statusline("Invalid mark letter");
|
|
}
|
|
}
|
|
|
|
static void goto_mark(void)
|
|
{
|
|
int letter;
|
|
int i;
|
|
|
|
print_statusline("Go to mark: ");
|
|
letter = less_getch(sizeof("Go to mark: ") - 1);
|
|
clear_line();
|
|
|
|
if (isalpha(letter)) {
|
|
for (i = 0; i <= num_marks; i++)
|
|
if (letter == mark_lines[i][0]) {
|
|
buffer_line(mark_lines[i][1]);
|
|
break;
|
|
}
|
|
if (num_marks == 14 && letter != mark_lines[14][0])
|
|
print_statusline("Mark not set");
|
|
} else
|
|
print_statusline("Invalid mark letter");
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_FEATURE_LESS_BRACKETS
|
|
static char opp_bracket(char bracket)
|
|
{
|
|
switch (bracket) {
|
|
case '{': case '[': /* '}' == '{' + 2. Same for '[' */
|
|
bracket++;
|
|
case '(': /* ')' == '(' + 1 */
|
|
bracket++;
|
|
break;
|
|
case '}': case ']':
|
|
bracket--;
|
|
case ')':
|
|
bracket--;
|
|
break;
|
|
};
|
|
return bracket;
|
|
}
|
|
|
|
static void match_right_bracket(char bracket)
|
|
{
|
|
unsigned i;
|
|
|
|
if (strchr(flines[cur_fline], bracket) == NULL) {
|
|
print_statusline("No bracket in top line");
|
|
return;
|
|
}
|
|
bracket = opp_bracket(bracket);
|
|
for (i = cur_fline + 1; i < max_fline; i++) {
|
|
if (strchr(flines[i], bracket) != NULL) {
|
|
buffer_line(i);
|
|
return;
|
|
}
|
|
}
|
|
print_statusline("No matching bracket found");
|
|
}
|
|
|
|
static void match_left_bracket(char bracket)
|
|
{
|
|
int i;
|
|
|
|
if (strchr(flines[cur_fline + max_displayed_line], bracket) == NULL) {
|
|
print_statusline("No bracket in bottom line");
|
|
return;
|
|
}
|
|
|
|
bracket = opp_bracket(bracket);
|
|
for (i = cur_fline + max_displayed_line; i >= 0; i--) {
|
|
if (strchr(flines[i], bracket) != NULL) {
|
|
buffer_line(i);
|
|
return;
|
|
}
|
|
}
|
|
print_statusline("No matching bracket found");
|
|
}
|
|
#endif /* FEATURE_LESS_BRACKETS */
|
|
|
|
static void keypress_process(int keypress)
|
|
{
|
|
switch (keypress) {
|
|
case KEY_DOWN: case 'e': case 'j': case 0x0d:
|
|
buffer_down(1);
|
|
break;
|
|
case KEY_UP: case 'y': case 'k':
|
|
buffer_up(1);
|
|
break;
|
|
case PAGE_DOWN: case ' ': case 'z': case 'f':
|
|
buffer_down(max_displayed_line + 1);
|
|
break;
|
|
case PAGE_UP: case 'w': case 'b':
|
|
buffer_up(max_displayed_line + 1);
|
|
break;
|
|
case 'd':
|
|
buffer_down((max_displayed_line + 1) / 2);
|
|
break;
|
|
case 'u':
|
|
buffer_up((max_displayed_line + 1) / 2);
|
|
break;
|
|
case KEY_HOME: case 'g': case 'p': case '<': case '%':
|
|
buffer_line(0);
|
|
break;
|
|
case KEY_END: case 'G': case '>':
|
|
cur_fline = MAXLINES;
|
|
read_lines();
|
|
buffer_line(cur_fline);
|
|
break;
|
|
case 'q': case 'Q':
|
|
less_exit(EXIT_SUCCESS);
|
|
break;
|
|
#if ENABLE_FEATURE_LESS_MARKS
|
|
case 'm':
|
|
add_mark();
|
|
buffer_print();
|
|
break;
|
|
case '\'':
|
|
goto_mark();
|
|
buffer_print();
|
|
break;
|
|
#endif
|
|
case 'r': case 'R':
|
|
buffer_print();
|
|
break;
|
|
/*case 'R':
|
|
full_repaint();
|
|
break;*/
|
|
case 's':
|
|
save_input_to_file();
|
|
break;
|
|
case 'E':
|
|
examine_file();
|
|
break;
|
|
#if ENABLE_FEATURE_LESS_FLAGS
|
|
case '=':
|
|
m_status_print();
|
|
break;
|
|
#endif
|
|
#if ENABLE_FEATURE_LESS_REGEXP
|
|
case '/':
|
|
option_mask32 &= ~LESS_STATE_MATCH_BACKWARDS;
|
|
regex_process();
|
|
break;
|
|
case 'n':
|
|
goto_match(match_pos + 1);
|
|
break;
|
|
case 'N':
|
|
goto_match(match_pos - 1);
|
|
break;
|
|
case '?':
|
|
option_mask32 |= LESS_STATE_MATCH_BACKWARDS;
|
|
regex_process();
|
|
break;
|
|
#endif
|
|
#if ENABLE_FEATURE_LESS_FLAGCS
|
|
case '-':
|
|
flag_change();
|
|
buffer_print();
|
|
break;
|
|
case '_':
|
|
show_flag_status();
|
|
break;
|
|
#endif
|
|
#if ENABLE_FEATURE_LESS_BRACKETS
|
|
case '{': case '(': case '[':
|
|
match_right_bracket(keypress);
|
|
break;
|
|
case '}': case ')': case ']':
|
|
match_left_bracket(keypress);
|
|
break;
|
|
#endif
|
|
case ':':
|
|
colon_process();
|
|
break;
|
|
}
|
|
|
|
if (isdigit(keypress))
|
|
number_process(keypress);
|
|
}
|
|
|
|
static void sig_catcher(int sig)
|
|
{
|
|
less_exit(- sig);
|
|
}
|
|
|
|
int less_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int less_main(int argc, char **argv)
|
|
{
|
|
int keypress;
|
|
|
|
INIT_G();
|
|
|
|
/* TODO: -x: do not interpret backspace, -xx: tab also */
|
|
/* -xxx: newline also */
|
|
/* -w N: assume width N (-xxx -w 32: hex viewer of sorts) */
|
|
getopt32(argv, "EMmN~");
|
|
argc -= optind;
|
|
argv += optind;
|
|
num_files = argc;
|
|
files = argv;
|
|
|
|
/* Another popular pager, most, detects when stdout
|
|
* is not a tty and turns into cat. This makes sense. */
|
|
if (!isatty(STDOUT_FILENO))
|
|
return bb_cat(argv);
|
|
kbd_fd = open(CURRENT_TTY, O_RDONLY);
|
|
if (kbd_fd < 0)
|
|
return bb_cat(argv);
|
|
ndelay_on(kbd_fd);
|
|
|
|
if (!num_files) {
|
|
if (isatty(STDIN_FILENO)) {
|
|
/* Just "less"? No args and no redirection? */
|
|
bb_error_msg("missing filename");
|
|
bb_show_usage();
|
|
}
|
|
} else
|
|
filename = xstrdup(files[0]);
|
|
|
|
get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
|
|
/* 20: two tabstops + 4 */
|
|
if (width < 20 || max_displayed_line < 3)
|
|
return bb_cat(argv);
|
|
max_displayed_line -= 2;
|
|
|
|
buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
|
|
if (option_mask32 & FLAG_TILDE)
|
|
empty_line_marker = "";
|
|
|
|
tcgetattr(kbd_fd, &term_orig);
|
|
term_less = term_orig;
|
|
term_less.c_lflag &= ~(ICANON | ECHO);
|
|
term_less.c_iflag &= ~(IXON | ICRNL);
|
|
/*term_less.c_oflag &= ~ONLCR;*/
|
|
term_less.c_cc[VMIN] = 1;
|
|
term_less.c_cc[VTIME] = 0;
|
|
|
|
/* We want to restore term_orig on exit */
|
|
bb_signals(BB_FATAL_SIGS, sig_catcher);
|
|
|
|
reinitialize();
|
|
while (1) {
|
|
keypress = less_getch(-1); /* -1: do not position cursor */
|
|
keypress_process(keypress);
|
|
}
|
|
}
|