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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
|
/*
* The authors of this software are Rob Pike and Ken Thompson,
* with contributions from Mike Burrows and Sean Dorward.
*
* Copyright (c) 2002-2006 by Lucent Technologies.
* Portions Copyright (c) 2004 Google Inc.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose without fee is hereby granted, provided that this entire notice
* is included in all copies of any software which is or includes a copy
* or modification of this software and in all copies of the supporting
* documentation for such software.
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES
* NOR GOOGLE INC MAKE ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING
* THE MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
*/
#include <u.h>
#include <libc.h>
#include "fmtdef.h"
/*
* How many bytes of output UTF will be produced by quoting (if necessary) this string?
* How many runes? How much of the input will be consumed?
* The parameter q is filled in by __quotesetup.
* The string may be UTF or Runes (s or r).
* Return count does not include NUL.
* Terminate the scan at the first of:
* NUL in input
* count exceeded in input
* count exceeded on output
* *ninp is set to number of input bytes accepted.
* nin may be <0 initially, to avoid checking input by count.
*/
void
__quotesetup(char *s, Rune *r, int nin, int nout, Quoteinfo *q, int sharp, int runesout)
{
int w;
Rune c;
q->quoted = 0;
q->nbytesout = 0;
q->nrunesout = 0;
q->nbytesin = 0;
q->nrunesin = 0;
if(sharp || nin==0 || (s && *s=='\0') || (r && *r=='\0')){
if(nout < 2)
return;
q->quoted = 1;
q->nbytesout = 2;
q->nrunesout = 2;
}
for(; nin!=0; nin--){
if(s)
w = chartorune(&c, s);
else{
c = *r;
w = runelen(c);
}
if(c == '\0')
break;
if(runesout){
if(q->nrunesout+1 > nout)
break;
}else{
if(q->nbytesout+w > nout)
break;
}
if((c <= L' ') || (c == L'\'') || (fmtdoquote!=nil && fmtdoquote((int)c))){
if(!q->quoted){
if(runesout){
if(1+q->nrunesout+1+1 > nout) /* no room for quotes */
break;
}else{
if(1+q->nbytesout+w+1 > nout) /* no room for quotes */
break;
}
q->nrunesout += 2; /* include quotes */
q->nbytesout += 2; /* include quotes */
q->quoted = 1;
}
if(c == '\'') {
if(runesout){
if(1+q->nrunesout+1 > nout) /* no room for quotes */
break;
}else{
if(1+q->nbytesout+w > nout) /* no room for quotes */
break;
}
q->nbytesout++;
q->nrunesout++; /* quotes reproduce as two characters */
}
}
/* advance input */
if(s)
s += w;
else
r++;
q->nbytesin += w;
q->nrunesin++;
/* advance output */
q->nbytesout += w;
q->nrunesout++;
#ifndef PLAN9PORT
/* ANSI requires precision in bytes, not Runes. */
nin-= w-1; /* and then n-- in the loop */
#endif
}
}
static int
qstrfmt(char *sin, Rune *rin, Quoteinfo *q, Fmt *f)
{
Rune r, *rm, *rme;
char *t, *s, *m, *me;
Rune *rt, *rs;
ulong fl;
int nc, w;
m = sin;
me = m + q->nbytesin;
rm = rin;
rme = rm + q->nrunesin;
fl = f->flags;
w = 0;
if(fl & FmtWidth)
w = f->width;
if(f->runes){
if(!(fl & FmtLeft) && __rfmtpad(f, w - q->nrunesout) < 0)
return -1;
}else{
if(!(fl & FmtLeft) && __fmtpad(f, w - q->nbytesout) < 0)
return -1;
}
t = (char*)f->to;
s = (char*)f->stop;
rt = (Rune*)f->to;
rs = (Rune*)f->stop;
if(f->runes)
FMTRCHAR(f, rt, rs, '\'');
else
FMTRUNE(f, t, s, '\'');
for(nc = q->nrunesin; nc > 0; nc--){
if(sin){
r = *(uchar*)m;
if(r < Runeself)
m++;
else if((me - m) >= UTFmax || fullrune(m, (int)(me-m)))
m += chartorune(&r, m);
else
break;
}else{
if(rm >= rme)
break;
r = *(uchar*)rm++;
}
if(f->runes){
FMTRCHAR(f, rt, rs, r);
if(r == '\'')
FMTRCHAR(f, rt, rs, r);
}else{
FMTRUNE(f, t, s, r);
if(r == '\'')
FMTRUNE(f, t, s, r);
}
}
if(f->runes){
FMTRCHAR(f, rt, rs, '\'');
USED(rs);
f->nfmt += (int)(rt - (Rune *)f->to);
f->to = rt;
if(fl & FmtLeft && __rfmtpad(f, w - q->nrunesout) < 0)
return -1;
}else{
FMTRUNE(f, t, s, '\'');
USED(s);
f->nfmt += (int)(t - (char *)f->to);
f->to = t;
if(fl & FmtLeft && __fmtpad(f, w - q->nbytesout) < 0)
return -1;
}
return 0;
}
int
__quotestrfmt(int runesin, Fmt *f)
{
int nin, outlen;
Rune *r;
char *s;
Quoteinfo q;
nin = -1;
if(f->flags&FmtPrec)
nin = f->prec;
if(runesin){
r = va_arg(f->args, Rune *);
s = nil;
}else{
s = va_arg(f->args, char *);
r = nil;
}
if(!s && !r)
return __fmtcpy(f, (void*)"<nil>", 5, 5);
if(f->flush)
outlen = 0x7FFFFFFF; /* if we can flush, no output limit */
else if(f->runes)
outlen = (int)((Rune*)f->stop - (Rune*)f->to);
else
outlen = (int)((char*)f->stop - (char*)f->to);
__quotesetup(s, r, nin, outlen, &q, f->flags&FmtSharp, f->runes);
/*print("bytes in %d bytes out %d runes in %d runesout %d\n", q.nbytesin, q.nbytesout, q.nrunesin, q.nrunesout); */
if(runesin){
if(!q.quoted)
return __fmtrcpy(f, r, q.nrunesin);
return qstrfmt(nil, r, &q, f);
}
if(!q.quoted)
return __fmtcpy(f, s, q.nrunesin, q.nbytesin);
return qstrfmt(s, nil, &q, f);
}
int
quotestrfmt(Fmt *f)
{
return __quotestrfmt(0, f);
}
int
quoterunestrfmt(Fmt *f)
{
return __quotestrfmt(1, f);
}
void
quotefmtinstall(void)
{
fmtinstall('q', quotestrfmt);
fmtinstall('Q', quoterunestrfmt);
}
int
__needsquotes(char *s, int *quotelenp)
{
Quoteinfo q;
__quotesetup(s, nil, -1, 0x7FFFFFFF, &q, 0, 0);
*quotelenp = q.nbytesout;
return q.quoted;
}
int
__runeneedsquotes(Rune *r, int *quotelenp)
{
Quoteinfo q;
__quotesetup(nil, r, -1, 0x7FFFFFFF, &q, 0, 0);
*quotelenp = q.nrunesout;
return q.quoted;
}
|
