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/*
* "$Id: run.c 611 2005-01-11 21:37:42Z mike $"
*
* External program function for the ESP Package Manager (EPM).
*
* Copyright 1999-2005 by Easy Software Products.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Contents:
*
* run_command() - Run an external program.
*/
/*
* Include necessary headers...
*/
#include "epm.h"
#include <stdarg.h>
#include <fcntl.h>
#include <sys/wait.h>
/*
* 'run_command()' - Run an external program.
*/
int /* O - Exit status */
run_command(const char *directory, /* I - Directory for command or NULL */
const char *command, /* I - Command string */
...) /* I - Additional arguments as needed */
{
va_list ap; /* Argument pointer */
int pid, /* Child process ID */
status, /* Status of child */
argc; /* Number of arguments */
char argbuf[10240], /* Argument buffer */
*argptr, /* Argument string pointer */
*argv[100]; /* Argument strings */
/*
* Format the command string...
*/
va_start(ap, command);
vsnprintf(argbuf, sizeof(argbuf) - 1, command, ap);
argbuf[sizeof(argbuf) - 1] = '\0';
if (Verbosity > 1)
puts(argbuf);
/*
* Parse the argument string; arguments can be separated by whitespace
* and quoted by " and '...
*/
argv[0] = argbuf;
for (argptr = argbuf, argc = 1; *argptr != '\0' && argc < 99; argptr ++)
if (isspace(*argptr & 255))
{
*argptr++ = '\0';
while (isspace(*argptr & 255))
argptr ++;
if (*argptr != '\0')
{
argv[argc] = argptr;
argc ++;
}
argptr --;
}
else if (*argptr == '\'')
{
if (argptr == argv[argc - 1])
argv[argc - 1] ++;
for (argptr ++; *argptr && *argptr != '\''; argptr ++)
if (*argptr == '\\' && argptr[1])
strcpy(argptr, argptr + 1);
if (*argptr == '\'')
strcpy(argptr, argptr + 1);
argptr --;
}
else if (*argptr == '\"')
{
if (argptr == argv[argc - 1])
argv[argc - 1] ++;
for (argptr ++; *argptr && *argptr != '\"'; argptr ++)
if (*argptr == '\\' && argptr[1])
strcpy(argptr, argptr + 1);
if (*argptr == '\"')
strcpy(argptr, argptr + 1);
argptr --;
}
argv[argc] = NULL;
/*
* Execute the command...
*/
if ((pid = fork()) == 0)
{
/*
* Child comes here... Redirect stdin, stdout, and stderr to /dev/null
* if !Verbosity...
*/
if (Verbosity < 2)
{
close(0);
close(1);
close(2);
open("/dev/null", O_RDWR);
dup(0);
dup(0);
}
/*
* Change directories...
*/
if (directory)
chdir(directory);
/*
* Execute the program; if an error occurs, exit with the UNIX error...
*/
execvp(argv[0], argv);
fprintf(stderr, "epm: Unable to execute \"%s\" program: %s\n", argv[0],
strerror(errno));
exit(errno);
}
else if (pid < 0)
{
/*
* Error - can't fork!
*/
perror("epm: fork failed");
return (1);
}
/*
* Fork successful - wait for the child and return the error status...
*/
if (wait(&status) != pid)
{
fputs("epm: Got exit status from wrong program!\n", stderr);
return (1);
}
else if (WIFSIGNALED(status))
return (-WTERMSIG(status));
else
return (WEXITSTATUS(status));
}
/*
* End of "$Id: run.c 611 2005-01-11 21:37:42Z mike $".
*/
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