shell.c
3.29 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2001, 2005, 2007, 2009 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;
util_getenv (&last, "gnu-last-command", Mail_env_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 (util_getenv (NULL, "bang", Mail_env_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);
util_setenv ("gnu-last-command", buf, Mail_env_string, 1);
/* 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;
}