svn commit: trunk/busybox/miscutils
vda at busybox.net
vda at busybox.net
Sat Feb 23 11:54:38 UTC 2008
Author: vda
Date: 2008-02-23 03:54:37 -0800 (Sat, 23 Feb 2008)
New Revision: 21092
Log:
less: make it a bit more resistant against statusline corruption.
less: "examine" command will not bomb out on bad file name now
less_main 1663 1694 +31
examine_file 87 114 +27
less_getch 138 160 +22
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 80/0) Total: 80 bytes
text data bss dec hex filename
798368 740 7484 806592 c4ec0 busybox_old
798470 740 7484 806694 c4f26 busybox_unstripped
Modified:
trunk/busybox/miscutils/less.c
Changeset:
Modified: trunk/busybox/miscutils/less.c
===================================================================
--- trunk/busybox/miscutils/less.c 2008-02-23 01:28:28 UTC (rev 21091)
+++ trunk/busybox/miscutils/less.c 2008-02-23 11:54:37 UTC (rev 21092)
@@ -706,13 +706,16 @@
/* 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(void)
+static int less_getch(int pos)
{
unsigned char input[16];
unsigned i;
+
again:
+ less_gets_pos = pos;
memset(input, 0, sizeof(input));
getch_nowait(input, sizeof(input));
+ less_gets_pos = -1;
/* Detect escape sequences (i.e. arrow keys) and handle
* them accordingly */
@@ -777,12 +780,17 @@
char *new_fname;
print_statusline("Examine: ");
- new_fname = less_gets(sizeof("Examine: ")-1);
+ new_fname = less_gets(sizeof("Examine: ") - 1);
if (!new_fname[0]) {
+ status_print();
+ err:
free(new_fname);
- status_print();
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??
@@ -838,7 +846,7 @@
/* Clear the current line and print a prompt */
print_statusline(" :");
- keypress = less_getch();
+ keypress = less_getch(2);
switch (keypress) {
case 'd':
remove_current_file();
@@ -971,7 +979,7 @@
static void number_process(int first_digit)
{
- int i = 1;
+ int i;
int num;
char num_input[sizeof(int)*4]; /* more than enough */
char keypress;
@@ -983,8 +991,9 @@
printf(":%c", first_digit);
/* Receive input until a letter is given */
+ i = 1;
while (i < sizeof(num_input)-1) {
- num_input[i] = less_getch();
+ num_input[i] = less_getch(i + 1);
if (!num_input[i] || !isdigit(num_input[i]))
break;
bb_putchar(num_input[i]);
@@ -1043,7 +1052,7 @@
clear_line();
bb_putchar('-');
- keypress = less_getch();
+ keypress = less_getch(1);
switch (keypress) {
case 'M':
@@ -1068,7 +1077,7 @@
clear_line();
bb_putchar('_');
- keypress = less_getch();
+ keypress = less_getch(1);
switch (keypress) {
case 'M':
@@ -1127,7 +1136,7 @@
int letter;
print_statusline("Mark: ");
- letter = less_getch();
+ letter = less_getch(sizeof("Mark: ") - 1);
if (isalpha(letter)) {
/* If we exceed 15 marks, start overwriting previous ones */
@@ -1148,7 +1157,7 @@
int i;
print_statusline("Go to mark: ");
- letter = less_getch();
+ letter = less_getch(sizeof("Go to mark: ") - 1);
clear_line();
if (isalpha(letter)) {
@@ -1385,7 +1394,7 @@
reinitialize();
while (1) {
- keypress = less_getch();
+ keypress = less_getch(-1); /* -1: do not position cursor */
keypress_process(keypress);
}
}
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