1*0b459c2cSDavid du Colombier /* Shell command argument quoting.
2*0b459c2cSDavid du Colombier Copyright (C) 1994, 1995, 1997 Free Software Foundation, Inc.
3*0b459c2cSDavid du Colombier
4*0b459c2cSDavid du Colombier This program is free software; you can redistribute it and/or modify
5*0b459c2cSDavid du Colombier it under the terms of the GNU General Public License as published by
6*0b459c2cSDavid du Colombier the Free Software Foundation; either version 2, or (at your option)
7*0b459c2cSDavid du Colombier any later version.
8*0b459c2cSDavid du Colombier
9*0b459c2cSDavid du Colombier This program is distributed in the hope that it will be useful,
10*0b459c2cSDavid du Colombier but WITHOUT ANY WARRANTY; without even the implied warranty of
11*0b459c2cSDavid du Colombier MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12*0b459c2cSDavid du Colombier GNU General Public License for more details.
13*0b459c2cSDavid du Colombier
14*0b459c2cSDavid du Colombier You should have received a copy of the GNU General Public License
15*0b459c2cSDavid du Colombier along with this program; see the file COPYING.
16*0b459c2cSDavid du Colombier If not, write to the Free Software Foundation,
17*0b459c2cSDavid du Colombier 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18*0b459c2cSDavid du Colombier
19*0b459c2cSDavid du Colombier /* Written by Paul Eggert <eggert@twinsun.com> */
20*0b459c2cSDavid du Colombier
21*0b459c2cSDavid du Colombier #if HAVE_CONFIG_H
22*0b459c2cSDavid du Colombier # include <config.h>
23*0b459c2cSDavid du Colombier #endif
24*0b459c2cSDavid du Colombier
25*0b459c2cSDavid du Colombier #include <sys/types.h>
26*0b459c2cSDavid du Colombier #include <quotearg.h>
27*0b459c2cSDavid du Colombier
28*0b459c2cSDavid du Colombier /* Place into QUOTED a quoted version of ARG suitable for `system'.
29*0b459c2cSDavid du Colombier Return the length of the resulting string (which is not null-terminated).
30*0b459c2cSDavid du Colombier If QUOTED is null, return the length without any side effects. */
31*0b459c2cSDavid du Colombier
32*0b459c2cSDavid du Colombier size_t
quote_system_arg(quoted,arg)33*0b459c2cSDavid du Colombier quote_system_arg (quoted, arg)
34*0b459c2cSDavid du Colombier char *quoted;
35*0b459c2cSDavid du Colombier char const *arg;
36*0b459c2cSDavid du Colombier {
37*0b459c2cSDavid du Colombier char const *a;
38*0b459c2cSDavid du Colombier size_t len = 0;
39*0b459c2cSDavid du Colombier
40*0b459c2cSDavid du Colombier /* Scan ARG, copying it to QUOTED if QUOTED is not null,
41*0b459c2cSDavid du Colombier looking for shell metacharacters. */
42*0b459c2cSDavid du Colombier
43*0b459c2cSDavid du Colombier for (a = arg; ; a++)
44*0b459c2cSDavid du Colombier {
45*0b459c2cSDavid du Colombier char c = *a;
46*0b459c2cSDavid du Colombier switch (c)
47*0b459c2cSDavid du Colombier {
48*0b459c2cSDavid du Colombier case 0:
49*0b459c2cSDavid du Colombier /* ARG has no shell metacharacters. */
50*0b459c2cSDavid du Colombier return len;
51*0b459c2cSDavid du Colombier
52*0b459c2cSDavid du Colombier case '=':
53*0b459c2cSDavid du Colombier if (*arg == '-')
54*0b459c2cSDavid du Colombier break;
55*0b459c2cSDavid du Colombier /* Fall through. */
56*0b459c2cSDavid du Colombier case '\t': case '\n': case ' ':
57*0b459c2cSDavid du Colombier case '!': case '"': case '#': case '$': case '%': case '&': case '\'':
58*0b459c2cSDavid du Colombier case '(': case ')': case '*': case ';':
59*0b459c2cSDavid du Colombier case '<': case '>': case '?': case '[': case '\\':
60*0b459c2cSDavid du Colombier case '^': case '`': case '|': case '~':
61*0b459c2cSDavid du Colombier {
62*0b459c2cSDavid du Colombier /* ARG has a shell metacharacter.
63*0b459c2cSDavid du Colombier Start over, quoting it this time. */
64*0b459c2cSDavid du Colombier
65*0b459c2cSDavid du Colombier len = 0;
66*0b459c2cSDavid du Colombier c = *arg++;
67*0b459c2cSDavid du Colombier
68*0b459c2cSDavid du Colombier /* If ARG is an option, quote just its argument.
69*0b459c2cSDavid du Colombier This is not necessary, but it looks nicer. */
70*0b459c2cSDavid du Colombier if (c == '-' && arg < a)
71*0b459c2cSDavid du Colombier {
72*0b459c2cSDavid du Colombier c = *arg++;
73*0b459c2cSDavid du Colombier
74*0b459c2cSDavid du Colombier if (quoted)
75*0b459c2cSDavid du Colombier {
76*0b459c2cSDavid du Colombier quoted[len] = '-';
77*0b459c2cSDavid du Colombier quoted[len + 1] = c;
78*0b459c2cSDavid du Colombier }
79*0b459c2cSDavid du Colombier len += 2;
80*0b459c2cSDavid du Colombier
81*0b459c2cSDavid du Colombier if (c == '-')
82*0b459c2cSDavid du Colombier while (arg < a)
83*0b459c2cSDavid du Colombier {
84*0b459c2cSDavid du Colombier c = *arg++;
85*0b459c2cSDavid du Colombier if (quoted)
86*0b459c2cSDavid du Colombier quoted[len] = c;
87*0b459c2cSDavid du Colombier len++;
88*0b459c2cSDavid du Colombier if (c == '=')
89*0b459c2cSDavid du Colombier break;
90*0b459c2cSDavid du Colombier }
91*0b459c2cSDavid du Colombier c = *arg++;
92*0b459c2cSDavid du Colombier }
93*0b459c2cSDavid du Colombier
94*0b459c2cSDavid du Colombier if (quoted)
95*0b459c2cSDavid du Colombier quoted[len] = '\'';
96*0b459c2cSDavid du Colombier len++;
97*0b459c2cSDavid du Colombier
98*0b459c2cSDavid du Colombier for (; c; c = *arg++)
99*0b459c2cSDavid du Colombier {
100*0b459c2cSDavid du Colombier if (c == '\'')
101*0b459c2cSDavid du Colombier {
102*0b459c2cSDavid du Colombier if (quoted)
103*0b459c2cSDavid du Colombier {
104*0b459c2cSDavid du Colombier quoted[len] = '\'';
105*0b459c2cSDavid du Colombier quoted[len + 1] = '\\';
106*0b459c2cSDavid du Colombier quoted[len + 2] = '\'';
107*0b459c2cSDavid du Colombier }
108*0b459c2cSDavid du Colombier len += 3;
109*0b459c2cSDavid du Colombier }
110*0b459c2cSDavid du Colombier if (quoted)
111*0b459c2cSDavid du Colombier quoted[len] = c;
112*0b459c2cSDavid du Colombier len++;
113*0b459c2cSDavid du Colombier }
114*0b459c2cSDavid du Colombier
115*0b459c2cSDavid du Colombier if (quoted)
116*0b459c2cSDavid du Colombier quoted[len] = '\'';
117*0b459c2cSDavid du Colombier return len + 1;
118*0b459c2cSDavid du Colombier }
119*0b459c2cSDavid du Colombier }
120*0b459c2cSDavid du Colombier
121*0b459c2cSDavid du Colombier if (quoted)
122*0b459c2cSDavid du Colombier quoted[len] = c;
123*0b459c2cSDavid du Colombier len++;
124*0b459c2cSDavid du Colombier }
125*0b459c2cSDavid du Colombier }
126