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
|
/*
* escape.c - printing handling
*
* Copyright © 2011-2023 Jim Warner <james.warner@comcast.net>
* Copyright © 2016-2023 Craig Small <csmall@dropbear.xyz>
* Copyright © 1998-2005 Albert Cahalan
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include "escape.h"
#include "readproc.h"
#include "nls.h"
#define SECURE_ESCAPE_ARGS(dst, bytes) do { \
if ((bytes) <= 0) return 0; \
*(dst) = '\0'; \
if ((bytes) >= INT_MAX) return 0; \
} while (0)
static const char UTF_tab[] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x00 - 0x0F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x10 - 0x1F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x20 - 0x2F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x30 - 0x3F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x40 - 0x4F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x50 - 0x5F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x60 - 0x6F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x70 - 0x7F
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 0x80 - 0x8F
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 0x90 - 0x9F
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 0xA0 - 0xAF
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 0xB0 - 0xBF
-1,-1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xC0 - 0xCF
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xD0 - 0xDF
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // 0xE0 - 0xEF
4, 4, 4, 4, 4,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 0xF0 - 0xFF
};
static const unsigned char ESC_tab[] = {
"@..............................." // 0x00 - 0x1F
"||||||||||||||||||||||||||||||||" // 0x20 - 0x3F
"||||||||||||||||||||||||||||||||" // 0x40 - 0x5f
"|||||||||||||||||||||||||||||||." // 0x60 - 0x7F
"????????????????????????????????" // 0x80 - 0x9F
"????????????????????????????????" // 0xA0 - 0xBF
"????????????????????????????????" // 0xC0 - 0xDF
"????????????????????????????????" // 0xE0 - 0xFF
};
static inline void esc_all (unsigned char *str) {
unsigned char c;
// if bad locale/corrupt str, replace non-printing stuff
while (*str) {
if ((c = ESC_tab[*str]) != '|')
*str = c;
++str;
}
}
static inline void esc_ctl (unsigned char *str, int len) {
#define setQ { *str = '?'; n = 1; goto next_up; }
int i, n, x;
for (i = 0; i < len; ) {
n = UTF_tab[*str];
/* even with a proper locale, strings might be corrupt or we
might encounter one of those 32 unicode multibyte control
characters which begin at U+0080 (0xc280) */
if (n < 0 || i + n > len
|| (*str == 0xc2 && str[1] >= 0x80 && str[1] <= 0x9f)) {
setQ
}
/* let's validate those utf-8 continuation bytes too, all of
which must take the binary form of 10xxxxxx */
for (x = 1; x < n; x++) {
if (str[x] < 0x80 || str[x] > 0xbf) {
setQ
}
}
// and eliminate those non-printing control characters
if (*str < 0x20 || *str == 0x7f)
*str = '?';
next_up:
str += n;
i += n;
}
#undef setQ
}
int escape_str (char *dst, const char *src, int bufsize) {
static __thread int utf_sw = 0;
int n;
if (utf_sw == 0) {
char *enc = nl_langinfo(CODESET);
utf_sw = enc && strcasecmp(enc, "UTF-8") == 0 ? 1 : -1;
}
SECURE_ESCAPE_ARGS(dst, bufsize);
n = snprintf(dst, bufsize, "%s", src);
if (n < 0) {
*dst = '\0';
return 0;
}
if (n >= bufsize) n = bufsize-1;
if (utf_sw < 0)
esc_all((unsigned char *)dst);
else
esc_ctl((unsigned char *)dst, n);
return n;
}
int escape_command (char *outbuf, const proc_t *pp, int bytes, unsigned flags) {
int overhead = 0;
int end = 0;
if (flags & ESC_BRACKETS)
overhead += 2;
if (flags & ESC_DEFUNCT) {
if (pp->state == 'Z') overhead += 10; // chars in " <defunct>"
else flags &= ~ESC_DEFUNCT;
}
if (overhead + 1 >= bytes) {
// if no room for even one byte of the command name
outbuf[0] = '\0';
return 0;
}
if (flags & ESC_BRACKETS)
outbuf[end++] = '[';
end += escape_str(outbuf+end, pp->cmd, bytes-overhead);
// we want "[foo] <defunct>", not "[foo <defunct>]"
if (flags & ESC_BRACKETS)
outbuf[end++] = ']';
if (flags & ESC_DEFUNCT) {
memcpy(outbuf+end, " <defunct>", 10);
end += 10;
}
outbuf[end] = '\0';
return end; // bytes, not including the NUL
}
|
