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/*
* Copyright (C) 1984-2012 Mark Nudelman
* Modified for use with illumos by Garrett D'Amore.
* Copyright 2014 Garrett D'Amore <garrett@damore.org>
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information, see the README file.
*/
/*
* Routines to execute other programs.
* Necessarily very OS dependent.
*/
#include <signal.h>
#include "less.h"
#include "position.h"
extern int screen_trashed;
extern IFILE curr_ifile;
static int pipe_data(char *cmd, off_t spos, off_t epos);
/*
* Pass the specified command to a shell to be executed.
* Like plain "system()", but handles resetting terminal modes, etc.
*/
void
lsystem(const char *cmd, const char *donemsg)
{
int inp;
char *shell;
char *p;
IFILE save_ifile;
/*
* Print the command which is to be executed,
* unless the command starts with a "-".
*/
if (cmd[0] == '-')
cmd++;
else {
clear_bot();
putstr("!");
putstr(cmd);
putstr("\n");
}
/*
* Close the current input file.
*/
save_ifile = save_curr_ifile();
(void) edit_ifile(NULL);
/*
* De-initialize the terminal and take out of raw mode.
*/
deinit();
flush(0); /* Make sure the deinit chars get out */
raw_mode(0);
/*
* Restore signals to their defaults.
*/
init_signals(0);
/*
* Force standard input to be the user's terminal
* (the normal standard input), even if less's standard input
* is coming from a pipe.
*/
inp = dup(0);
(void) close(0);
if (open("/dev/tty", O_RDONLY) == -1)
(void) dup(inp);
/*
* Pass the command to the system to be executed.
* If we have a SHELL environment variable, use
* <$SHELL -c "command"> instead of just <command>.
* If the command is empty, just invoke a shell.
*/
p = NULL;
if ((shell = lgetenv("SHELL")) != NULL && *shell != '\0') {
if (*cmd == '\0') {
p = estrdup(shell);
} else {
char *esccmd = shell_quote(cmd);
if (esccmd != NULL) {
p = easprintf("%s -c %s", shell, esccmd);
free(esccmd);
}
}
}
if (p == NULL) {
if (*cmd == '\0')
p = estrdup("sh");
else
p = estrdup(cmd);
}
(void) system(p);
free(p);
/*
* Restore standard input, reset signals, raw mode, etc.
*/
(void) close(0);
(void) dup(inp);
(void) close(inp);
init_signals(1);
raw_mode(1);
if (donemsg != NULL) {
putstr(donemsg);
putstr(" (press RETURN)");
get_return();
(void) putchr('\n');
flush(0);
}
init();
screen_trashed = 1;
/*
* Reopen the current input file.
*/
reedit_ifile(save_ifile);
/*
* Since we were ignoring window change signals while we executed
* the system command, we must assume the window changed.
* Warning: this leaves a signal pending (in "signal_winch"),
* so psignals() should be called soon after lsystem().
*/
sigwinch(0);
}
/*
* Pipe a section of the input file into the given shell command.
* The section to be piped is the section "between" the current
* position and the position marked by the given letter.
*
* If the mark is after the current screen, the section between
* the top line displayed and the mark is piped.
* If the mark is before the current screen, the section between
* the mark and the bottom line displayed is piped.
* If the mark is on the current screen, or if the mark is ".",
* the whole current screen is piped.
*/
int
pipe_mark(int c, char *cmd)
{
off_t mpos, tpos, bpos;
/*
* mpos = the marked position.
* tpos = top of screen.
* bpos = bottom of screen.
*/
mpos = markpos(c);
if (mpos == -1)
return (-1);
tpos = position(TOP);
if (tpos == -1)
tpos = ch_zero();
bpos = position(BOTTOM);
if (c == '.')
return (pipe_data(cmd, tpos, bpos));
else if (mpos <= tpos)
return (pipe_data(cmd, mpos, bpos));
else if (bpos == -1)
return (pipe_data(cmd, tpos, bpos));
else
return (pipe_data(cmd, tpos, mpos));
}
/*
* Create a pipe to the given shell command.
* Feed it the file contents between the positions spos and epos.
*/
static int
pipe_data(char *cmd, off_t spos, off_t epos)
{
FILE *f;
int c;
/*
* This is structured much like lsystem().
* Since we're running a shell program, we must be careful
* to perform the necessary deinitialization before running
* the command, and reinitialization after it.
*/
if (ch_seek(spos) != 0) {
error("Cannot seek to start position", NULL);
return (-1);
}
if ((f = popen(cmd, "w")) == NULL) {
error("Cannot create pipe", NULL);
return (-1);
}
clear_bot();
putstr("!");
putstr(cmd);
putstr("\n");
deinit();
flush(0);
raw_mode(0);
init_signals(0);
lsignal(SIGPIPE, SIG_IGN);
c = EOI;
while (epos == -1 || spos++ <= epos) {
/*
* Read a character from the file and give it to the pipe.
*/
c = ch_forw_get();
if (c == EOI)
break;
if (putc(c, f) == EOF)
break;
}
/*
* Finish up the last line.
*/
while (c != '\n' && c != EOI) {
c = ch_forw_get();
if (c == EOI)
break;
if (putc(c, f) == EOF)
break;
}
(void) pclose(f);
lsignal(SIGPIPE, SIG_DFL);
init_signals(1);
raw_mode(1);
init();
screen_trashed = 1;
/* {{ Probably don't need this here. }} */
sigwinch(0);
return (0);
}
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