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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
#include "cache.h"
#include "quote.h"
/* Help to copy the thing properly quoted for the shell safety.
* any single quote is replaced with '\'', any exclamation point
* is replaced with '\!', and the whole thing is enclosed in a
*
* E.g.
* original sq_quote result
* name ==> name ==> 'name'
* a b ==> a b ==> 'a b'
* a'b ==> a'\''b ==> 'a'\''b'
* a!b ==> a'\!'b ==> 'a'\!'b'
*/
#undef EMIT
#define EMIT(x) ( (++len < n) && (*bp++ = (x)) )
size_t sq_quote_buf(char *dst, size_t n, const char *src)
{
char c;
char *bp = dst;
size_t len = 0;
EMIT('\'');
while ((c = *src++)) {
if (c == '\'' || c == '!') {
EMIT('\'');
EMIT('\\');
EMIT(c);
EMIT('\'');
} else {
EMIT(c);
}
}
EMIT('\'');
if ( n )
*bp = 0;
return len;
}
char *sq_quote(const char *src)
{
char *buf;
size_t cnt;
cnt = sq_quote_buf(NULL, 0, src) + 1;
buf = xmalloc(cnt);
sq_quote_buf(buf, cnt, src);
return buf;
}
/*
* C-style name quoting.
*
* Does one of three things:
*
* (1) if outbuf and outfp are both NULL, inspect the input name and
* counts the number of bytes that are needed to hold c_style
* quoted version of name, counting the double quotes around
* it but not terminating NUL, and returns it. However, if name
* does not need c_style quoting, it returns 0.
*
* (2) if outbuf is not NULL, it must point at a buffer large enough
* to hold the c_style quoted version of name, enclosing double
* quotes, and terminating NUL. Fills outbuf with c_style quoted
* version of name enclosed in double-quote pair. Return value
* is undefined.
*
* (3) if outfp is not NULL, outputs c_style quoted version of name,
* but not enclosed in double-quote pair. Return value is undefined.
*/
int quote_c_style(const char *name, char *outbuf, FILE *outfp, int no_dq)
{
#undef EMIT
#define EMIT(c) \
(outbuf ? (*outbuf++ = (c)) : outfp ? fputc(c, outfp) : (count++))
#define EMITQ() EMIT('\\')
const char *sp;
int ch, count = 0, needquote = 0;
if (!no_dq)
EMIT('"');
for (sp = name; (ch = *sp++); ) {
if ((ch < ' ') || (ch == '"') || (ch == '\\') ||
(ch == 0177)) {
needquote = 1;
switch (ch) {
case '\a': EMITQ(); ch = 'a'; break;
case '\b': EMITQ(); ch = 'b'; break;
case '\f': EMITQ(); ch = 'f'; break;
case '\n': EMITQ(); ch = 'n'; break;
case '\r': EMITQ(); ch = 'r'; break;
case '\t': EMITQ(); ch = 't'; break;
case '\v': EMITQ(); ch = 'v'; break;
case '\\': /* fallthru */
case '"': EMITQ(); break;
case ' ':
break;
default:
/* octal */
EMITQ();
EMIT(((ch >> 6) & 03) + '0');
EMIT(((ch >> 3) & 07) + '0');
ch = (ch & 07) + '0';
break;
}
}
EMIT(ch);
}
if (!no_dq)
EMIT('"');
if (outbuf)
*outbuf = 0;
return needquote ? count : 0;
}
/*
* C-style name unquoting.
*
* Quoted should point at the opening double quote. Returns
* an allocated memory that holds unquoted name, which the caller
* should free when done. Updates endp pointer to point at
* one past the ending double quote if given.
*/
char *unquote_c_style(const char *quoted, const char **endp)
{
const char *sp;
char *name = NULL, *outp = NULL;
int count = 0, ch, ac;
#undef EMIT
#define EMIT(c) (outp ? (*outp++ = (c)) : (count++))
if (*quoted++ != '"')
return NULL;
while (1) {
/* first pass counts and allocates, second pass fills */
for (sp = quoted; (ch = *sp++) != '"'; ) {
if (ch == '\\') {
switch (ch = *sp++) {
case 'a': ch = '\a'; break;
case 'b': ch = '\b'; break;
case 'f': ch = '\f'; break;
case 'n': ch = '\n'; break;
case 'r': ch = '\r'; break;
case 't': ch = '\t'; break;
case 'v': ch = '\v'; break;
case '\\': case '"':
break; /* verbatim */
case '0'...'7':
/* octal */
ac = ((ch - '0') << 6);
if ((ch = *sp++) < '0' || '7' < ch)
return NULL;
ac |= ((ch - '0') << 3);
if ((ch = *sp++) < '0' || '7' < ch)
return NULL;
ac |= (ch - '0');
ch = ac;
break;
default:
return NULL; /* malformed */
}
}
EMIT(ch);
}
if (name) {
*outp = 0;
if (endp)
*endp = sp;
return name;
}
outp = name = xmalloc(count + 1);
}
}
void write_name_quoted(const char *prefix, const char *name,
int quote, FILE *out)
{
int needquote;
if (!quote) {
no_quote:
if (prefix && prefix[0])
fputs(prefix, out);
fputs(name, out);
return;
}
needquote = 0;
if (prefix && prefix[0])
needquote = quote_c_style(prefix, NULL, NULL, 0);
if (!needquote)
needquote = quote_c_style(name, NULL, NULL, 0);
if (needquote) {
fputc('"', out);
if (prefix && prefix[0])
quote_c_style(prefix, NULL, out, 1);
quote_c_style(name, NULL, out, 1);
fputc('"', out);
}
else
goto no_quote;
}
|
