284 lines
6.6 KiB
C
284 lines
6.6 KiB
C
/*
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* Copyright (c) 1988 Mark Nudleman
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. 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, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)os.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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/*
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* Operating system dependent routines.
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*
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* Most of the stuff in here is based on Unix, but an attempt
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* has been made to make things work on other operating systems.
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* This will sometimes result in a loss of functionality, unless
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* someone rewrites code specifically for the new operating system.
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*
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* The makefile provides defines to decide whether various
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* Unix features are present.
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <signal.h>
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#include <setjmp.h>
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#include <stdio.h>
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#include <less.h>
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#include "pathnames.h"
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int reading;
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extern int screen_trashed;
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static jmp_buf read_label;
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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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lsystem(cmd)
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char *cmd;
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{
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int inp;
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char cmdbuf[256];
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char *shell, *getenv();
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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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lower_left();
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clear_eol();
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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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* De-initialize the terminal and take out of raw mode.
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*/
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deinit();
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flush();
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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 terminal, "/dev/tty",
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* even if less's standard input is coming from a pipe.
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*/
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inp = dup(0);
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(void)close(0);
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if (open(_PATH_TTY, O_RDONLY, 0) < 0)
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(void)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 ((shell = getenv("SHELL")) != NULL && *shell != '\0')
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{
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if (*cmd == '\0')
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cmd = shell;
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else
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{
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(void)sprintf(cmdbuf, "%s -c \"%s\"", shell, cmd);
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cmd = cmdbuf;
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}
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}
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if (*cmd == '\0')
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cmd = "sh";
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(void)system(cmd);
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/*
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* Restore standard input, reset signals, raw mode, etc.
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*/
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(void)close(0);
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(void)dup(inp);
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(void)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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#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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*/
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winch();
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#endif
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}
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/*
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* Like read() system call, but is deliberately interruptable.
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* A call to intread() from a signal handler will interrupt
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* any pending iread().
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*/
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iread(fd, buf, len)
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int fd;
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char *buf;
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int len;
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{
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register int n;
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if (setjmp(read_label))
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/*
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* We jumped here from intread.
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*/
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return (READ_INTR);
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flush();
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reading = 1;
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n = read(fd, buf, len);
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reading = 0;
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if (n < 0)
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return (-1);
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return (n);
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}
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intread()
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{
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(void)sigsetmask(0L);
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longjmp(read_label, 1);
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}
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/*
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* Expand a filename, substituting any environment variables, etc.
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* The implementation of this is necessarily very operating system
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* dependent. This implementation is unabashedly only for Unix systems.
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*/
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FILE *popen();
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char *
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glob(filename)
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char *filename;
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{
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FILE *f;
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char *p;
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int ch;
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char *cmd, *malloc(), *getenv();
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static char buffer[MAXPATHLEN];
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if (filename[0] == '#')
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return (filename);
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/*
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* We get the shell to expand the filename for us by passing
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* an "echo" command to the shell and reading its output.
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*/
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p = getenv("SHELL");
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if (p == NULL || *p == '\0')
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{
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/*
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* Read the output of <echo filename>.
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*/
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cmd = malloc((u_int)(strlen(filename)+8));
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if (cmd == NULL)
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return (filename);
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(void)sprintf(cmd, "echo \"%s\"", filename);
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} else
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{
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/*
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* Read the output of <$SHELL -c "echo filename">.
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*/
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cmd = malloc((u_int)(strlen(p)+12));
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if (cmd == NULL)
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return (filename);
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(void)sprintf(cmd, "%s -c \"echo %s\"", p, filename);
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}
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if ((f = popen(cmd, "r")) == NULL)
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return (filename);
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free(cmd);
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for (p = buffer; p < &buffer[sizeof(buffer)-1]; p++)
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{
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if ((ch = getc(f)) == '\n' || ch == EOF)
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break;
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*p = ch;
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}
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*p = '\0';
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(void)pclose(f);
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return(buffer);
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}
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char *
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bad_file(filename, message, len)
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char *filename, *message;
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u_int len;
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{
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extern int errno;
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struct stat statbuf;
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char *strcat(), *strerror();
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if (stat(filename, &statbuf) < 0) {
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(void)sprintf(message, "%s: %s", filename, strerror(errno));
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return(message);
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}
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if ((statbuf.st_mode & S_IFMT) == S_IFDIR) {
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static char is_dir[] = " is a directory";
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strtcpy(message, filename, (int)(len-sizeof(is_dir)-1));
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(void)strcat(message, is_dir);
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return(message);
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}
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return((char *)NULL);
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}
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/*
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* Copy a string, truncating to the specified length if necessary.
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* Unlike strncpy(), the resulting string is guaranteed to be null-terminated.
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*/
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strtcpy(to, from, len)
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char *to, *from;
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int len;
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{
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char *strncpy();
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(void)strncpy(to, from, (int)len);
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to[len-1] = '\0';
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}
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