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crontab: do not destroy STDIN_FILENO, editor may need it (crontab -e)

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vi: deal with EOF/error on stdin and with input NULs

function                                             old     new   delta
crontab_main                                         623     642     +19
edit_file                                            901     906      +5
readit                                               331     318     -13
This commit is contained in:
Denis Vlasenko
2008-09-21 15:29:29 +00:00
parent 006e8628fc
commit 30cfdf90ce
2 changed files with 34 additions and 31 deletions
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46
editors/vi.c
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@@ -147,10 +147,10 @@ struct globals {
#endif
smallint editing; // >0 while we are editing a file
// [code audit says "can be 0 or 1 only"]
// [code audit says "can be 0, 1 or 2 only"]
smallint cmd_mode; // 0=command 1=insert 2=replace
int file_modified; // buffer contents changed (counter, not flag!)
int last_file_modified; // = -1;
int last_file_modified; // = -1;
int fn_start; // index of first cmd line file name
int save_argc; // how many file names on cmd line
int cmdcnt; // repetition count
@@ -623,7 +623,7 @@ static void edit_file(char *fn)
// These are commands that change text[].
// Remember the input for the "." command
if (!adding2q && ioq_start == NULL
&& strchr(modifying_cmds, c)
&& c != '\0' && strchr(modifying_cmds, c)
) {
start_new_cmd_q(c);
}
@@ -645,8 +645,8 @@ static void edit_file(char *fn)
}
//-------------------------------------------------------------------
place_cursor(rows, 0, FALSE); // go to bottom of screen
clear_to_eol(); // Erase to end of line
place_cursor(rows - 1, 0, FALSE); // go to bottom of screen
clear_to_eol(); // erase to end of line
cookmode();
#undef cur_line
}
@@ -2009,9 +2009,9 @@ static void start_new_cmd_q(char c)
{
// get buffer for new cmd
// if there is a current cmd count put it in the buffer first
if (cmdcnt > 0)
if (cmdcnt > 0) {
lmc_len = sprintf(last_modifying_cmd, "%d%c", cmdcnt, c);
else { // just save char c onto queue
} else { // just save char c onto queue
last_modifying_cmd[0] = c;
lmc_len = 1;
}
@@ -2157,21 +2157,21 @@ static void winch_sig(int sig UNUSED_PARAM)
//----- Come here when we get a continue signal -------------------
static void cont_sig(int sig UNUSED_PARAM)
{
rawmode(); // terminal to "raw"
last_status_cksum = 0; // force status update
redraw(TRUE); // re-draw the screen
rawmode(); // terminal to "raw"
last_status_cksum = 0; // force status update
redraw(TRUE); // re-draw the screen
signal(SIGTSTP, suspend_sig);
signal(SIGCONT, SIG_DFL);
kill(my_pid, SIGCONT);
kill(my_pid, SIGCONT); // huh? why? we are already "continued"...
}
//----- Come here when we get a Suspend signal -------------------
static void suspend_sig(int sig UNUSED_PARAM)
{
place_cursor(rows - 1, 0, FALSE); // go to bottom of screen
clear_to_eol(); // Erase to end of line
cookmode(); // terminal to "cooked"
place_cursor(rows - 1, 0, FALSE); // go to bottom of screen
clear_to_eol(); // erase to end of line
cookmode(); // terminal to "cooked"
signal(SIGCONT, cont_sig);
signal(SIGTSTP, SIG_DFL);
@@ -2247,18 +2247,20 @@ static char readit(void) // read (maybe cursor) key from stdin
fflush(stdout);
n = chars_to_parse;
// get input from User- are there already input chars in Q?
// get input from User - are there already input chars in Q?
if (n <= 0) {
// the Q is empty, wait for a typed char
again:
n = safe_read(STDIN_FILENO, readbuffer, sizeof(readbuffer));
if (n < 0) {
if (errno == EBADF || errno == EFAULT || errno == EINVAL
|| errno == EIO)
editing = 0; // want to exit
errno = 0;
if (n <= 0) {
place_cursor(rows - 1, 0, FALSE); // go to bottom of screen
clear_to_eol(); // erase to end of line
cookmode(); // terminal to "cooked"
bb_error_msg_and_die("can't read user input");
}
if (n <= 0)
return 0; // error
/* elsewhere we can get very confused by NULs */
if (readbuffer[0] == '\0')
goto again;
if (readbuffer[0] == 27) {
// This is an ESC char. Is this Esc sequence?
// Could be bare Esc key. See if there are any