7abe80df59
PR: bin/5721 Submitted by: Oliver Fromme <oliver.fromme@heim3.tu-clausthal.de> Also, add "volatile" to a variable modified by signal handlers (coincidentally, the same variable involved in the above fix, although this isn't related to the reported problem).
286 lines
6.6 KiB
C
286 lines
6.6 KiB
C
/*
|
|
* Copyright (c) 1988 Mark Nudleman
|
|
* Copyright (c) 1988, 1993
|
|
* The Regents of the University of California. 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, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)os.c 8.1 (Berkeley) 6/6/93";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* Operating system dependent routines.
|
|
*
|
|
* Most of the stuff in here is based on Unix, but an attempt
|
|
* has been made to make things work on other operating systems.
|
|
* This will sometimes result in a loss of functionality, unless
|
|
* someone rewrites code specifically for the new operating system.
|
|
*
|
|
* The makefile provides defines to decide whether various
|
|
* Unix features are present.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/file.h>
|
|
#include <signal.h>
|
|
#include <setjmp.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <less.h>
|
|
#include "pathnames.h"
|
|
|
|
volatile int reading;
|
|
|
|
extern int screen_trashed;
|
|
|
|
static jmp_buf read_label;
|
|
|
|
/*
|
|
* Pass the specified command to a shell to be executed.
|
|
* Like plain "system()", but handles resetting terminal modes, etc.
|
|
*/
|
|
lsystem(cmd)
|
|
char *cmd;
|
|
{
|
|
int inp;
|
|
char cmdbuf[256];
|
|
char *shell, *getenv();
|
|
|
|
/*
|
|
* Print the command which is to be executed,
|
|
* unless the command starts with a "-".
|
|
*/
|
|
if (cmd[0] == '-')
|
|
cmd++;
|
|
else
|
|
{
|
|
lower_left();
|
|
clear_eol();
|
|
putstr("!");
|
|
putstr(cmd);
|
|
putstr("\n");
|
|
}
|
|
|
|
/*
|
|
* De-initialize the terminal and take out of raw mode.
|
|
*/
|
|
deinit();
|
|
flush();
|
|
raw_mode(0);
|
|
|
|
/*
|
|
* Restore signals to their defaults.
|
|
*/
|
|
init_signals(0);
|
|
|
|
/*
|
|
* Force standard input to be the terminal, "/dev/tty",
|
|
* even if less's standard input is coming from a pipe.
|
|
*/
|
|
inp = dup(0);
|
|
(void)close(0);
|
|
if (open(_PATH_TTY, O_RDONLY, 0) < 0)
|
|
(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.
|
|
*/
|
|
if ((shell = getenv("SHELL")) != NULL && *shell != '\0')
|
|
{
|
|
if (*cmd == '\0')
|
|
cmd = shell;
|
|
else
|
|
{
|
|
(void)snprintf(cmdbuf, sizeof(cmdbuf),
|
|
"%s -c \"%s\"", shell, cmd);
|
|
cmd = cmdbuf;
|
|
}
|
|
}
|
|
if (*cmd == '\0')
|
|
cmd = "sh";
|
|
|
|
(void)system(cmd);
|
|
|
|
/*
|
|
* Restore standard input, reset signals, raw mode, etc.
|
|
*/
|
|
(void)close(0);
|
|
(void)dup(inp);
|
|
(void)close(inp);
|
|
|
|
init_signals(1);
|
|
raw_mode(1);
|
|
init();
|
|
screen_trashed = 1;
|
|
#if defined(SIGWINCH) || defined(SIGWIND)
|
|
/*
|
|
* Since we were ignoring window change signals while we executed
|
|
* the system command, we must assume the window changed.
|
|
*/
|
|
winch();
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Like read() system call, but is deliberately interruptable.
|
|
* A call to intread() from a signal handler will interrupt
|
|
* any pending iread().
|
|
*/
|
|
iread(fd, buf, len)
|
|
int fd;
|
|
char *buf;
|
|
int len;
|
|
{
|
|
register int n;
|
|
|
|
if (setjmp(read_label))
|
|
/*
|
|
* We jumped here from intread.
|
|
*/
|
|
return (READ_INTR);
|
|
|
|
flush();
|
|
reading = 1;
|
|
n = read(fd, buf, len);
|
|
reading = 0;
|
|
if (n < 0)
|
|
return (-1);
|
|
return (n);
|
|
}
|
|
|
|
intread()
|
|
{
|
|
reading = 0;
|
|
(void)sigsetmask(0L);
|
|
longjmp(read_label, 1);
|
|
}
|
|
|
|
/*
|
|
* Expand a filename, substituting any environment variables, etc.
|
|
* The implementation of this is necessarily very operating system
|
|
* dependent. This implementation is unabashedly only for Unix systems.
|
|
*/
|
|
FILE *popen();
|
|
|
|
char *
|
|
glob(filename)
|
|
char *filename;
|
|
{
|
|
FILE *f;
|
|
char *p;
|
|
int ch;
|
|
char *cmd, *malloc(), *getenv();
|
|
static char buffer[MAXPATHLEN];
|
|
|
|
if (filename[0] == '#')
|
|
return (filename);
|
|
|
|
/*
|
|
* We get the shell to expand the filename for us by passing
|
|
* an "echo" command to the shell and reading its output.
|
|
*/
|
|
p = getenv("SHELL");
|
|
if (p == NULL || *p == '\0')
|
|
{
|
|
/*
|
|
* Read the output of <echo filename>.
|
|
*/
|
|
(void)asprintf(&cmd, "echo \"%s\"", filename);
|
|
if (cmd == NULL)
|
|
return (filename);
|
|
} else
|
|
{
|
|
/*
|
|
* Read the output of <$SHELL -c "echo filename">.
|
|
*/
|
|
(void)asprintf(&cmd, "%s -c \"echo %s\"", p, filename);
|
|
if (cmd == NULL)
|
|
return (filename);
|
|
}
|
|
|
|
if ((f = popen(cmd, "r")) == NULL)
|
|
return (filename);
|
|
free(cmd);
|
|
|
|
for (p = buffer; p < &buffer[sizeof(buffer)-1]; p++)
|
|
{
|
|
if ((ch = getc(f)) == '\n' || ch == EOF)
|
|
break;
|
|
*p = ch;
|
|
}
|
|
*p = '\0';
|
|
(void)pclose(f);
|
|
return(buffer);
|
|
}
|
|
|
|
char *
|
|
bad_file(filename, message, len)
|
|
char *filename, *message;
|
|
u_int len;
|
|
{
|
|
extern int errno;
|
|
struct stat statbuf;
|
|
char *strcat(), *strerror();
|
|
|
|
if (stat(filename, &statbuf) < 0) {
|
|
(void)snprintf(message, len,
|
|
"%s: %s", filename, strerror(errno));
|
|
return(message);
|
|
}
|
|
if ((statbuf.st_mode & S_IFMT) == S_IFDIR) {
|
|
static char is_dir[] = " is a directory";
|
|
|
|
strtcpy(message, filename, (int)(len-sizeof(is_dir)-1));
|
|
(void)strcat(message, is_dir);
|
|
return(message);
|
|
}
|
|
return((char *)NULL);
|
|
}
|
|
|
|
/*
|
|
* Copy a string, truncating to the specified length if necessary.
|
|
* Unlike strncpy(), the resulting string is guaranteed to be null-terminated.
|
|
*/
|
|
strtcpy(to, from, len)
|
|
char *to, *from;
|
|
int len;
|
|
{
|
|
char *strncpy();
|
|
|
|
(void)strncpy(to, from, (int)len);
|
|
to[len-1] = '\0';
|
|
}
|
|
|