shell.c
3.35 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2001, 2005, 2007, 2009, 2010 Free Software
Foundation, Inc.
GNU Mailutils 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 3, or (at your option)
any later version.
GNU Mailutils 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.
You should have received a copy of the GNU General Public License
along with GNU Mailutils; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301 USA */
#include "mail.h"
static void
expand_bang (char **pbuf)
{
char *last = NULL;
char *tmp, *p, *q;
size_t count = 0;
mailvar_get (&last, "gnu-last-command", mailvar_type_string, 0);
for (p = *pbuf; *p; p++)
if (*p == '!')
count++;
if (count == 0)
return;
if (!last)
{
util_error (_("No previous command"));
return;
}
tmp = xmalloc (strlen (*pbuf) + count * (strlen (last) - 1) + 1);
for (p = *pbuf, q = tmp; *p; )
{
if (*p == '!')
{
strcpy (q, last);
q += strlen (q);
p++;
}
else
*p++ = *q++;
}
*q = 0;
free (*pbuf);
*pbuf = tmp;
}
int
mail_execute (int shell, int argc, char **argv)
{
pid_t pid;
char *buf = NULL;
char *argv0 = NULL;
if (argc)
{
argv0 = argv[0];
/* Skip leading whitespace from argv[0] */
while (mu_isspace (**argv))
(*argv)++;
}
/* Expand arguments if required */
if (mailvar_get (NULL, "bang", mailvar_type_boolean, 0) == 0)
{
int i;
for (i = 0; i < argc; i++)
expand_bang (argv + i);
}
/* Construct command line and save it to gnu-last-command variable */
mu_argcv_string (argc, argv, &buf);
mailvar_set ("gnu-last-command", buf, mailvar_type_string,
MOPTF_QUIET|MOPTF_OVERWRITE);
/* Do actual work */
pid = fork ();
if (pid == 0)
{
if (shell)
{
if (argc == 0)
{
argv = xmalloc (sizeof (argv[0]) * 2);
argv[0] = getenv ("SHELL");
argv[1] = NULL;
argc = 1;
}
else
{
/* 1(shell) + 1 (-c) + 1(arg) + 1 (null) = 4 */
argv = xmalloc (4 * (sizeof (argv[0])));
argv[0] = getenv ("SHELL");
argv[1] = "-c";
argv[2] = buf;
argv[3] = NULL;
argc = 3;
}
}
execvp (argv[0], argv);
exit (1);
}
else
{
if (argv0) /* Restore argv[0], else mu_argcv_free will coredump */
argv[0] = argv0;
free (buf);
if (pid > 0)
{
while (waitpid (pid, NULL, 0) == -1)
/* do nothing */;
return 0;
}
else /* if (pid < 0) */
{
mu_error ("fork failed: %s", mu_strerror (errno));
return 1;
}
}
}
/*
* sh[ell] [command] -- GNU extension
* ![command] -- GNU extension
*/
int
mail_shell (int argc, char **argv)
{
if (argv[0][0] == '!' && strlen (argv[0]) > 1)
{
argv[0][0] = ' ';
return mail_execute (1, argc, argv);
}
else if (argc > 1)
{
return mail_execute (0, argc-1, argv+1);
}
else
{
return mail_execute (1, 0, NULL);
}
return 1;
}