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authorGravatar Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2006-12-04 16:04:50 +0000
committerGravatar Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2006-12-04 16:04:50 +0000
commit882e60c44249d1a2a7d78d873dce02f16eb19eac (patch)
tree14f1b2a8a4da6825af0c26fb33db37c1c76ce1e3 /miscutils/less.c
parentbbda98f14c66fb573bc75ff3b9222697d2ffa8fb (diff)
downloadbusybox-882e60c44249d1a2a7d78d873dce02f16eb19eac.tar.gz
busybox-882e60c44249d1a2a7d78d873dce02f16eb19eac.tar.bz2
- shrink less.
01a: svn version 01b: merge past_eof and inp_stdin into flags. 01c: merge match_backwards into flags. 01d: add handling of <HOME> and <END> keys, remove set_tty_raw, use fflush_stdout_and_exit 01e: rewrite special-key handling to be smaller. 01f: changing the format saves 4 bytes (alot of places would benefit from this) text data bss dec hex filename 9034 8 648 9690 25da less.o.01a 9023 8 640 9671 25c7 less.o.01b 9027 8 636 9671 25c7 less.o.01c 9068 8 636 9712 25f0 less.o.01d 8990 8 636 9634 25a2 less.o.01e 8986 8 636 9630 259e less.o.01f
Diffstat (limited to 'miscutils/less.c')
-rw-r--r--miscutils/less.c105
1 files changed, 49 insertions, 56 deletions
diff --git a/miscutils/less.c b/miscutils/less.c
index de97ba6b9..03ffd78ed 100644
--- a/miscutils/less.c
+++ b/miscutils/less.c
@@ -44,14 +44,18 @@
#define REAL_KEY_LEFT 'D'
#define REAL_PAGE_UP '5'
#define REAL_PAGE_DOWN '6'
+#define REAL_KEY_HOME '7'
+#define REAL_KEY_END '8'
/* These are the special codes assigned by this program to the special keys */
-#define PAGE_UP 20
-#define PAGE_DOWN 21
-#define KEY_UP 22
-#define KEY_DOWN 23
-#define KEY_RIGHT 24
-#define KEY_LEFT 25
+#define KEY_UP 20
+#define KEY_DOWN 21
+#define KEY_RIGHT 22
+#define KEY_LEFT 23
+#define PAGE_UP 24
+#define PAGE_DOWN 25
+#define KEY_HOME 26
+#define KEY_END 27
/* The escape codes for highlighted and normal text */
#define HIGHLIGHT "\033[7m"
@@ -73,7 +77,6 @@ static int current_file = 1;
static int line_pos;
static int num_flines;
static int num_files = 1;
-static int past_eof;
/* Command line options */
static unsigned flags;
@@ -82,10 +85,11 @@ static unsigned flags;
#define FLAG_m (1<<2)
#define FLAG_N (1<<3)
#define FLAG_TILDE (1<<4)
-
-/* This is needed so that program behaviour changes when input comes from
- stdin */
-static int inp_stdin;
+/* hijack command line options variable for internal state vars */
+#define LESS_STATE_INP_STDIN (1<<5)
+#define LESS_STATE_PAST_EOF (1<<6)
+#define LESS_STATE_MATCH_BACKWARDS (1<<7)
+/* INP_STDIN is used to change behaviour when input comes from stdin */
#ifdef CONFIG_FEATURE_LESS_MARKS
static int mark_lines[15][2];
@@ -97,7 +101,6 @@ static int match_found;
static int *match_lines;
static int match_pos;
static int num_matches;
-static int match_backwards;
static regex_t old_pattern;
#endif
@@ -114,12 +117,6 @@ static void set_tty_cooked(void)
tcsetattr(fileno(inp), TCSANOW, &term_orig);
}
-/* Set terminal input to raw mode (taken from vi.c) */
-static void set_tty_raw(void)
-{
- tcsetattr(fileno(inp), TCSANOW, &term_vi);
-}
-
/* Exit the program gracefully */
static void tless_exit(int code)
{
@@ -129,7 +126,7 @@ static void tless_exit(int code)
only termios.h? */
putchar('\n');
- exit(code);
+ fflush_stdout_and_exit(code);
}
/* Grab a character from input without requiring the return key. If the
@@ -138,28 +135,23 @@ static void tless_exit(int code)
static int tless_getch(void)
{
int input;
-
- set_tty_raw();
+ /* Set terminal input to raw mode (taken from vi.c) */
+ tcsetattr(fileno(inp), TCSANOW, &term_vi);
input = getc(inp);
/* Detect escape sequences (i.e. arrow keys) and handle
them accordingly */
if (input == '\033' && getc(inp) == '[') {
+ unsigned int i;
input = getc(inp);
set_tty_cooked();
- if (input == REAL_KEY_UP)
- return KEY_UP;
- else if (input == REAL_KEY_DOWN)
- return KEY_DOWN;
- else if (input == REAL_KEY_RIGHT)
- return KEY_RIGHT;
- else if (input == REAL_KEY_LEFT)
- return KEY_LEFT;
- else if (input == REAL_PAGE_UP)
- return PAGE_UP;
- else if (input == REAL_PAGE_DOWN)
- return PAGE_DOWN;
+
+ i = input - REAL_KEY_UP;
+ if (i < 4)
+ return 20 + i;
+ else if ((i = input - REAL_PAGE_UP) < 4)
+ return 24 + i;
}
/* The input is a normal ASCII value */
else {
@@ -200,7 +192,7 @@ static void data_readlines(void)
char current_line[256];
FILE *fp;
- fp = (inp_stdin) ? stdin : xfopen(filename, "r");
+ fp = (flags & LESS_STATE_INP_STDIN) ? stdin : xfopen(filename, "r");
flines = NULL;
for (i = 0; (feof(fp)==0) && (i <= MAXLINES); i++) {
strcpy(current_line, "");
@@ -215,12 +207,12 @@ static void data_readlines(void)
/* Reset variables for a new file */
line_pos = 0;
- past_eof = 0;
+ flags &= ~LESS_STATE_PAST_EOF;
fclose(fp);
if (inp == NULL)
- inp = (inp_stdin) ? xfopen(CURRENT_TTY, "r") : stdin;
+ inp = (flags & LESS_STATE_INP_STDIN) ? xfopen(CURRENT_TTY, "r") : stdin;
if (flags & FLAG_N)
add_linenumbers();
@@ -240,7 +232,7 @@ static void m_status_print(void)
{
int percentage;
- if (!past_eof) {
+ if (!(flags & LESS_STATE_PAST_EOF)) {
if (!line_pos) {
if (num_files > 1)
printf("%s%s %s%i%s%i%s%i-%i/%i ", HIGHLIGHT,
@@ -372,7 +364,7 @@ static void buffer_down(int nlines)
{
int i;
- if (!past_eof) {
+ if (!(flags & LESS_STATE_PAST_EOF)) {
if (line_pos + (height - 3) + nlines < num_flines) {
line_pos += nlines;
for (i = 0; i < (height - 1); i++) {
@@ -403,7 +395,7 @@ static void buffer_up(int nlines)
int i;
int tilde_line;
- if (!past_eof) {
+ if (!(flags & LESS_STATE_PAST_EOF)) {
if (line_pos - nlines >= 0) {
line_pos -= nlines;
for (i = 0; i < (height - 1); i++) {
@@ -431,7 +423,7 @@ static void buffer_up(int nlines)
/* Going backwards nlines lines has taken us to a point where
nothing is past the EOF, so we revert to normal. */
if (line_pos < num_flines - height + 3) {
- past_eof = 0;
+ flags &= ~LESS_STATE_PAST_EOF;
buffer_up(nlines);
}
else {
@@ -453,7 +445,7 @@ static void buffer_up(int nlines)
static void buffer_line(int linenum)
{
int i;
- past_eof = 0;
+ flags &= ~LESS_STATE_PAST_EOF;
if (linenum < 0 || linenum > num_flines) {
clear_line();
@@ -477,7 +469,7 @@ static void buffer_line(int linenum)
}
line_pos = linenum;
/* Set past_eof so buffer_down and buffer_up act differently */
- past_eof = 1;
+ flags |= LESS_STATE_PAST_EOF;
buffer_print();
}
}
@@ -513,7 +505,7 @@ static void examine_file(void)
current_file = num_files + 1;
num_files++;
- inp_stdin = 0;
+ flags &= ~LESS_STATE_INP_STDIN;
reinitialise();
}
@@ -666,13 +658,14 @@ static void regex_process(void)
regex_t pattern;
/* Get the uncompiled regular expression from the user */
clear_line();
- putchar((match_backwards) ? '?' : '/');
+ putchar((flags & LESS_STATE_MATCH_BACKWARDS) ? '?' : '/');
uncomp_regex[0] = 0;
fgets(uncomp_regex, sizeof(uncomp_regex), inp);
if (strlen(uncomp_regex) == 1) {
if (num_matches)
- goto_match(match_backwards ? match_pos - 1 : match_pos + 1);
+ goto_match((flags & LESS_STATE_MATCH_BACKWARDS)
+ ? match_pos - 1 : match_pos + 1);
else
buffer_print();
return;
@@ -710,7 +703,7 @@ static void regex_process(void)
num_matches = j;
if ((match_lines[0] != -1) && (num_flines > height - 2)) {
- if (match_backwards) {
+ if (flags & LESS_STATE_MATCH_BACKWARDS) {
for (i = 0; i < num_matches; i++) {
if (match_lines[i] > line_pos) {
match_pos = i - 1;
@@ -776,11 +769,11 @@ static void number_process(int first_digit)
goto_match(match_pos + num);
break;
case '/':
- match_backwards = 0;
+ flags &= ~LESS_STATE_MATCH_BACKWARDS;
regex_process();
break;
case '?':
- match_backwards = 1;
+ flags |= LESS_STATE_MATCH_BACKWARDS;
regex_process();
break;
#endif
@@ -878,7 +871,7 @@ static void save_input_to_file(void)
buffer_print();
}
else
- printf("%sNo log file%s", HIGHLIGHT, NORMAL);
+ printf("%s%s%s", HIGHLIGHT, "No log file", NORMAL);
}
#ifdef CONFIG_FEATURE_LESS_MARKS
@@ -1029,10 +1022,10 @@ static void keypress_process(int keypress)
buffer_up((height - 1) / 2);
buffer_print();
break;
- case 'g': case 'p': case '<': case '%':
+ case KEY_HOME: case 'g': case 'p': case '<': case '%':
buffer_line(0);
break;
- case 'G': case '>':
+ case KEY_END: case 'G': case '>':
buffer_line(num_flines - height + 2);
break;
case 'q': case 'Q':
@@ -1055,7 +1048,7 @@ static void keypress_process(int keypress)
full_repaint();
break;
case 's':
- if (inp_stdin)
+ if (flags & LESS_STATE_INP_STDIN)
save_input_to_file();
break;
case 'E':
@@ -1069,7 +1062,7 @@ static void keypress_process(int keypress)
#endif
#ifdef CONFIG_FEATURE_LESS_REGEXP
case '/':
- match_backwards = 0;
+ flags &= ~LESS_STATE_MATCH_BACKWARDS;
regex_process();
break;
case 'n':
@@ -1079,7 +1072,7 @@ static void keypress_process(int keypress)
goto_match(match_pos - 1);
break;
case '?':
- match_backwards = 1;
+ flags |= LESS_STATE_MATCH_BACKWARDS;
regex_process();
break;
#endif
@@ -1124,14 +1117,14 @@ int less_main(int argc, char **argv) {
if (!num_files) {
if (ttyname(STDIN_FILENO) == NULL)
- inp_stdin = 1;
+ flags |= LESS_STATE_INP_STDIN;
else {
bb_error_msg("missing filename");
bb_show_usage();
}
}
- strcpy(filename, (inp_stdin) ? bb_msg_standard_input : files[0]);
+ strcpy(filename, (flags & LESS_STATE_INP_STDIN) ? bb_msg_standard_input : files[0]);
get_terminal_width_height(0, &width, &height);
data_readlines();
tcgetattr(fileno(inp), &term_orig);