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lsystem.c
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C/C++ Source or Header
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1996-09-28
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8KB
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397 lines
/*
* Copyright (c) 1984,1985,1989,1994,1995,1996 Mark Nudelman
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice in the documentation and/or other materials provided with
* the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Routines to execute other programs.
* Necessarily very OS dependent.
*/
#include <signal.h>
#include "less.h"
#include "position.h"
#if MSDOS_COMPILER
#include <dos.h>
#endif
extern int screen_trashed;
extern IFILE curr_ifile;
#if HAVE_SYSTEM
/*
* Pass the specified command to a shell to be executed.
* Like plain "system()", but handles resetting terminal modes, etc.
*/
public void
lsystem(cmd, donemsg)
char *cmd;
char *donemsg;
{
register int inp;
register char *shell;
register 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 = curr_ifile;
(void) edit_ifile(NULL_IFILE);
/*
* De-initialize the terminal and take out of raw mode.
*/
deinit();
flush(); /* Make sure the deinit chars get out */
raw_mode(0);
/*
* Restore signals to their defaults.
*/
init_signals(0);
#if HAVE_DUP
/*
* 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);
close(0);
if (OPEN_TTYIN() < 0)
dup(inp);
#endif
/*
* 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.
*/
#if HAVE_SHELL
p = NULL;
if ((shell = lgetenv("SHELL")) != NULL && *shell != '\0')
{
if (*cmd == '\0')
p = save(shell);
else
{
p = (char *) ecalloc(strlen(shell) + strlen(cmd) + 7,
sizeof(char));
sprintf(p, "%s -c \"%s\"", shell, cmd);
}
}
if (p == NULL)
{
if (*cmd == '\0')
p = save("sh");
else
p = save(cmd);
}
system(p);
free(p);
#else
system(cmd);
#endif
#if HAVE_DUP
/*
* Restore standard input, reset signals, raw mode, etc.
*/
close(0);
dup(inp);
close(inp);
#endif
init_signals(1);
raw_mode(1);
if (donemsg != NULL)
{
putstr(donemsg);
putstr(" (press RETURN)");
get_return();
}
init();
screen_trashed = 1;
/*
* Reopen the current input file.
*/
reedit_ifile(save_ifile);
#if defined(SIGWINCH) || defined(SIGWIND)
/*
* 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 "sigs"),
* so psignals() should be called soon after lsystem().
*/
winch(0);
#endif
}
#endif
#if PIPEC
/*
* 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.
*/
public int
pipe_mark(c, cmd)
int c;
char *cmd;
{
POSITION mpos, tpos, bpos;
/*
* mpos = the marked position.
* tpos = top of screen.
* bpos = bottom of screen.
*/
mpos = markpos(c);
if (mpos == NULL_POSITION)
return (-1);
tpos = position(TOP);
if (tpos == NULL_POSITION)
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 == NULL_POSITION)
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.
*/
public int
pipe_data(cmd, spos, epos)
char *cmd;
POSITION spos;
POSITION epos;
{
register FILE *f;
register int c;
extern FILE *popen();
/*
* 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_PARG);
return (-1);
}
if ((f = popen(cmd, "w")) == NULL)
{
error("Cannot create pipe", NULL_PARG);
return (-1);
}
clear_bot();
putstr("!");
putstr(cmd);
putstr("\n");
deinit();
flush();
raw_mode(0);
init_signals(0);
#ifdef SIGPIPE
LSIGNAL(SIGPIPE, SIG_IGN);
#endif
c = EOI;
while (epos == NULL_POSITION || 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;
}
pclose(f);
#ifdef SIGPIPE
LSIGNAL(SIGPIPE, SIG_DFL);
#endif
init_signals(1);
raw_mode(1);
init();
screen_trashed = 1;
#if defined(SIGWINCH) || defined(SIGWIND)
/* {{ Probably don't need this here. }} */
winch(0);
#endif
return (0);
}
#endif
#ifdef _OSK
/*
* Popen, and Pclose, for OS-9.
*/
#define ERR (-1)
#define PIPEMAX _NFILE
#define READ 1 /* For OS-9 */
#define WRITE 2 /* For OS-9 */
#define STDIN 0 /* For OS-9 */
#define STDOUT 1 /* For OS-9 */
#define RESTORE free(parameter); close(path); dup(save); close(save);
static int _pid[PIPEMAX];
FILE *popen(command, type)
char *command, *type;
{
register char *p = command;
char *parameter;
FILE *_pfp;
int l, path, pipe, pcnt, save;
path = (*type == 'w') ? STDIN : STDOUT;
if ((pipe = open("/pipe", READ+WRITE)) == ERR)
return (NULL);
pcnt = pipe;
if ((save = dup(path)) == ERR)
{
close(pipe);
return (NULL);
}
close(path);
if (dup(pipe) == ERR)
{
dup(save);
close(save);
close(pipe);
return (NULL);
}
while (*p != ' ' && *p)
p++;
if (*p == ' ')
p++;
l = strlen(p);
parameter = (char *) malloc(l+2);
strcpy(parameter,p);
strcat(parameter,"\n");
if ((_pid[pcnt] = os9fork(command,l+1,parameter,1,1,0)) == ERR)
{
{ RESTORE }
close(pipe);
_pid[pcnt] = 0;
return (NULL);
}
{ RESTORE }
if ((_pfp = fdopen(pipe,type)) == NULL)
{
close(pipe);
while (((l=wait(0)) != _pid[pcnt]) && l != ERR)
;
_pid[pcnt] = 0;
return (NULL);
}
return (_pfp);
}
int pclose(stream)
FILE *stream;
{
register int i;
int f, status;
f = fileno(stream);
fclose(stream);
while ((i = wait(&status)) != _pid[f] && i != ERR)
;
_pid[f] = 0;
return ((i == ERR) ? ERR : status);
}
#endif /* _OSK */