#include "xregex.h"
#endif
-/* In progress */
-#define ENABLE_FEATURE_LESS_REWRAP 0
-
-/* 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"
/* Command line options */
enum {
- FLAG_E = 1,
+ FLAG_E = 1 << 0,
FLAG_M = 1 << 1,
FLAG_m = 1 << 2,
FLAG_N = 1 << 3,
FLAG_TILDE = 1 << 4,
FLAG_I = 1 << 5,
+ FLAG_S = (1 << 6) * ENABLE_FEATURE_LESS_DASHCMD,
/* hijack command line options variable for internal state vars */
- LESS_STATE_NO_WRAP = 1 << 14,
LESS_STATE_MATCH_BACKWARDS = 1 << 15,
};
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 max_displayed_line;
unsigned width;
+#if ENABLE_FEATURE_LESS_WINCH
+ unsigned winch_counter;
+#endif
ssize_t eof_error; /* eof if 0, error if < 0 */
ssize_t readpos;
ssize_t readeof; /* must be signed */
#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 max_displayed_line (G.max_displayed_line)
#define width (G.width )
+#define winch_counter (G.winch_counter )
#define eof_error (G.eof_error )
#define readpos (G.readpos )
#define readeof (G.readeof )
exit(code);
}
-#if ENABLE_FEATURE_LESS_REWRAP
+#if ENABLE_FEATURE_LESS_LINENUMS || ENABLE_FEATURE_LESS_WINCH
static void re_wrap(void)
{
int w = width;
linepos = 0; // XXX
cur_fline = new_cur_fline;
/* max_lineno is screen-size independent */
+ pattern_valid = 0;
}
#endif
eof_error = 0; /* Pretend we saw EOF */
break;
}
- if (max_fline > cur_fline + max_displayed_line) {
+ if (!(option_mask32 & FLAG_S)
+ ? (max_fline > cur_fline + max_displayed_line)
+ : (max_fline >= cur_fline
+ && max_lineno > LINENO(flines[cur_fline]) + max_displayed_line)
+ ) {
#if !ENABLE_FEATURE_LESS_REGEXP
break;
#else
status_print();
}
-#if ENABLE_FEATURE_LESS_REWRAP
static void buffer_fill_and_print(void)
{
- unsigned i = 0;
- int fpos = cur_fline + i;
+ unsigned i;
+#if ENABLE_FEATURE_LESS_DASHCMD
+ int fpos = cur_fline;
- if (option_mask32 & LESS_STATE_NO_WRAP) {
+ if (option_mask32 & FLAG_S) {
/* Go back to the beginning of this line */
while (fpos && LINENO(flines[fpos]) == LINENO(flines[fpos-1]))
fpos--;
}
+ i = 0;
while (i <= max_displayed_line && fpos <= max_fline) {
int lineno = LINENO(flines[fpos]);
buffer[i] = flines[fpos];
do {
fpos++;
} while ((fpos <= max_fline)
- && (option_mask32 & LESS_STATE_NO_WRAP)
+ && (option_mask32 & FLAG_S)
&& lineno == LINENO(flines[fpos])
);
}
- for (; i <= max_displayed_line; i++) {
- buffer[i] = empty_line_marker;
- }
- buffer_print();
-}
#else
-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];
}
+#endif
for (; i <= max_displayed_line; i++) {
buffer[i] = empty_line_marker;
}
buffer_print();
}
-#endif
/* Move the buffer up and down in the file in order to scroll */
static void buffer_down(int nlines)
if (less_gets_pos >= 0)
move_cursor(max_displayed_line + 2, less_gets_pos + 1);
fflush(stdout);
+#if ENABLE_FEATURE_LESS_WINCH
+ while (1) {
+ int r;
+ r = poll(pfd + rd, 2 - rd, -1);
+ if (/*r < 0 && errno == EINTR &&*/ winch_counter) {
+ input[0] = '\\'; /* anything which has no defined function */
+ return 1;
+ }
+ if (r) break;
+ }
+#else
safe_poll(pfd + rd, 2 - rd, -1);
+#endif
input[0] = '\0';
rd = safe_read(kbd_fd, input, sz); /* NB: kbd_fd is in O_NONBLOCK mode */
/* Compile the regex and check for errors */
err = regcomp_or_errmsg(&pattern, uncomp_regex,
- option_mask32 & FLAG_I ? REG_ICASE : 0);
+ (option_mask32 & FLAG_I) ? REG_ICASE : 0);
free(uncomp_regex);
if (err) {
print_statusline(err);
}
}
-#if ENABLE_FEATURE_LESS_FLAGCS
+#if ENABLE_FEATURE_LESS_DASHCMD
static void flag_change(void)
{
int keypress;
case '~':
option_mask32 ^= FLAG_TILDE;
break;
+ case 'S':
+ option_mask32 ^= FLAG_S;
+ buffer_fill_and_print();
+ break;
+#if ENABLE_FEATURE_LESS_LINENUMS
+ case 'N':
+ option_mask32 ^= FLAG_N;
+ re_wrap();
+ buffer_fill_and_print();
+ break;
+#endif
}
}
regex_process();
break;
#endif
-#if ENABLE_FEATURE_LESS_FLAGCS
+#if ENABLE_FEATURE_LESS_DASHCMD
case '-':
flag_change();
buffer_print();
case ':':
colon_process();
break;
-#if ENABLE_FEATURE_LESS_REWRAP
- case '*': /* Should be -N command / option */
- option_mask32 ^= FLAG_N;
- get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
- if (width < 20) /* 20: two tabstops + 4 */
- width = 20;
- if (max_displayed_line < 3)
- max_displayed_line = 3;
- max_displayed_line -= 2;
- free(buffer);
- buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
- re_wrap();
- buffer_fill_and_print();
- break;
- case '&': /* Should be -S command / option */
- option_mask32 ^= LESS_STATE_NO_WRAP;
- buffer_fill_and_print();
- break;
-#endif
}
if (isdigit(keypress))
less_exit(- sig);
}
+#if ENABLE_FEATURE_LESS_WINCH
+static void sigwinch_handler(int sig UNUSED_PARAM)
+{
+ winch_counter++;
+}
+#endif
+
int less_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int less_main(int argc, char **argv)
{
/* 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~I");
+ getopt32(argv, "EMmN~I" USE_FEATURE_LESS_DASHCMD("S"));
argc -= optind;
argv += optind;
num_files = argc;
* 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)) {
bb_error_msg("missing filename");
bb_show_usage();
}
- } else
+ } 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 = "";
+ kbd_fd = open(CURRENT_TTY, O_RDONLY);
+ if (kbd_fd < 0)
+ return bb_cat(argv);
+ ndelay_on(kbd_fd);
+
tcgetattr(kbd_fd, &term_orig);
term_less = term_orig;
term_less.c_lflag &= ~(ICANON | ECHO);
term_less.c_cc[VMIN] = 1;
term_less.c_cc[VTIME] = 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;
+
/* We want to restore term_orig on exit */
bb_signals(BB_FATAL_SIGS, sig_catcher);
+#if ENABLE_FEATURE_LESS_WINCH
+ signal(SIGWINCH, sigwinch_handler);
+#endif
+ buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
reinitialize();
while (1) {
+#if ENABLE_FEATURE_LESS_WINCH
+ if (winch_counter) {
+ winch_counter--;
+ get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
+ /* 20: two tabstops + 4 */
+ if (width < 20)
+ width = 20;
+ if (max_displayed_line < 3)
+ max_displayed_line = 3;
+ max_displayed_line -= 2;
+ free(buffer);
+ buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
+ re_wrap();
+ buffer_fill_and_print();
+ }
+#endif
keypress = less_getch(-1); /* -1: do not position cursor */
keypress_process(keypress);
}
projects / oweals / busybox.git / commitdiff