301 lines
6.2 KiB
C
301 lines
6.2 KiB
C
/*
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* Copyright (c) 1984,1985,1989,1994,1995 Mark Nudelman
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice in the documentation and/or other materials provided with
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* the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Routines to execute other programs.
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* Necessarily very OS dependent.
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*/
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#include <signal.h>
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#include "less.h"
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#include "position.h"
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#if MSOFTC
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#include <dos.h>
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#endif
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extern int screen_trashed;
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extern IFILE curr_ifile;
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#if HAVE_SYSTEM
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/*
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* Pass the specified command to a shell to be executed.
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* Like plain "system()", but handles resetting terminal modes, etc.
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*/
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public void
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lsystem(cmd)
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char *cmd;
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{
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register int inp;
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#if MSOFTC || OS2
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register int inp2;
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#endif
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register char *shell;
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register char *p;
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IFILE save_ifile;
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/*
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* Print the command which is to be executed,
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* unless the command starts with a "-".
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*/
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if (cmd[0] == '-')
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cmd++;
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else
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{
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clear_bot();
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putstr("!");
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putstr(cmd);
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putstr("\n");
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}
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/*
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* Close the current input file.
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*/
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save_ifile = curr_ifile;
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(void) edit_ifile(NULL_IFILE);
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/*
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* De-initialize the terminal and take out of raw mode.
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*/
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deinit();
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flush(); /* Make sure the deinit chars get out */
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raw_mode(0);
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/*
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* Restore signals to their defaults.
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*/
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init_signals(0);
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/*
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* Force standard input to be the user's terminal
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* (the normal standard input), even if less's standard input
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* is coming from a pipe.
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*/
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inp = dup(0);
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close(0);
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if (OPEN_TTYIN() < 0)
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dup(inp);
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/*
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* Pass the command to the system to be executed.
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* If we have a SHELL environment variable, use
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* <$SHELL -c "command"> instead of just <command>.
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* If the command is empty, just invoke a shell.
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*/
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#if HAVE_SHELL
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p = NULL;
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if ((shell = getenv("SHELL")) != NULL && *shell != '\0')
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{
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if (*cmd == '\0')
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p = save(shell);
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else
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{
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p = (char *) ecalloc(strlen(shell) + strlen(cmd) + 7,
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sizeof(char));
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sprintf(p, "%s -c \"%s\"", shell, cmd);
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}
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}
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if (p == NULL)
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{
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if (*cmd == '\0')
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p = save("sh");
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else
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p = save(cmd);
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}
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system(p);
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free(p);
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#else
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#if OS2
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if (*cmd == '\0')
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cmd = "cmd.exe";
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#endif
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system(cmd);
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#endif
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/*
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* Restore standard input, reset signals, raw mode, etc.
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*/
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close(0);
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dup(inp);
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close(inp);
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init_signals(1);
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raw_mode(1);
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init();
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screen_trashed = 1;
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/*
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* Reopen the current input file.
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*/
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if (edit_ifile(save_ifile))
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quit(QUIT_ERROR);
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#if defined(SIGWINCH) || defined(SIGWIND)
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/*
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* Since we were ignoring window change signals while we executed
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* the system command, we must assume the window changed.
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* Warning: this leaves a signal pending (in "sigs"),
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* so psignals() should be called soon after lsystem().
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*/
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winch(0);
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#endif
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}
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#endif
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#if PIPEC
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/*
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* Pipe a section of the input file into the given shell command.
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* The section to be piped is the section "between" the current
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* position and the position marked by the given letter.
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*
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* The "current" position means the top line displayed if the mark
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* is after the current screen, or the bottom line displayed if
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* the mark is before the current screen.
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* If the mark is on the current screen, the whole screen is displayed.
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*/
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public int
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pipe_mark(c, cmd)
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int c;
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char *cmd;
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{
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POSITION mpos, tpos, bpos;
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/*
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* mpos = the marked position.
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* tpos = top of screen.
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* bpos = bottom of screen.
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*/
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mpos = markpos(c);
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if (mpos == NULL_POSITION)
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return (-1);
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tpos = position(TOP);
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if (tpos == NULL_POSITION)
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tpos = ch_zero();
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bpos = position(BOTTOM);
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if (c == '.')
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return (pipe_data(cmd, tpos, bpos));
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else if (mpos <= tpos)
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return (pipe_data(cmd, mpos, tpos));
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else if (bpos == NULL_POSITION)
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return (pipe_data(cmd, tpos, bpos));
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else
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return (pipe_data(cmd, tpos, mpos));
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}
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/*
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* Create a pipe to the given shell command.
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* Feed it the file contents between the positions spos and epos.
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*/
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public int
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pipe_data(cmd, spos, epos)
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char *cmd;
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POSITION spos;
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POSITION epos;
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{
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register FILE *f;
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register int c;
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extern FILE *popen();
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/*
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* This is structured much like lsystem().
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* Since we're running a shell program, we must be careful
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* to perform the necessary deinitialization before running
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* the command, and reinitialization after it.
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*/
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if (ch_seek(spos) != 0)
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{
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error("Cannot seek to start position", NULL_PARG);
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return (-1);
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}
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if ((f = popen(cmd, "w")) == NULL)
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{
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error("Cannot create pipe", NULL_PARG);
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return (-1);
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}
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clear_bot();
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putstr("!");
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putstr(cmd);
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putstr("\n");
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deinit();
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flush();
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raw_mode(0);
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init_signals(0);
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#ifdef SIGPIPE
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SIGNAL(SIGPIPE, SIG_IGN);
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#endif
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c = EOI;
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while (epos == NULL_POSITION || spos++ <= epos)
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{
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/*
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* Read a character from the file and give it to the pipe.
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*/
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c = ch_forw_get();
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if (c == EOI)
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break;
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if (putc(c, f) == EOF)
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break;
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}
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/*
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* Finish up the last line.
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*/
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while (c != '\n' && c != EOI )
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{
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c = ch_forw_get();
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if (c == EOI)
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break;
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if (putc(c, f) == EOF)
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break;
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}
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pclose(f);
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#ifdef SIGPIPE
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SIGNAL(SIGPIPE, SIG_DFL);
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#endif
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init_signals(1);
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raw_mode(1);
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init();
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screen_trashed = 1;
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#if defined(SIGWINCH) || defined(SIGWIND)
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/* {{ Probably don't need this here. }} */
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winch(0);
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#endif
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return (0);
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}
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#endif
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