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
|
/* Copyright (C) 2001-2020 Artifex Software, Inc.
All Rights Reserved.
This software is provided AS-IS with no warranty, either express or
implied.
This software is distributed under license and may not be copied,
modified or distributed except as expressly authorized under the terms
of the license contained in the file LICENSE in this distribution.
Refer to licensing information at http://www.artifex.com or contact
Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato,
CA 94945, U.S.A., +1(415)492-9861, for further information.
*/
/* String operators */
#include "memory_.h"
#include "ghost.h"
#include "gsutil.h"
#include "ialloc.h"
#include "iname.h"
#include "ivmspace.h"
#include "oper.h"
#include "store.h"
/* The generic operators (copy, get, put, getinterval, putinterval, */
/* length, and forall) are implemented in zgeneric.c. */
/* <int> .bytestring <bytestring> */
static int
zbytestring(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
byte *sbody;
uint size;
check_int_leu(*op, max_int);
size = (uint)op->value.intval;
sbody = ialloc_bytes(size, ".bytestring");
if (sbody == 0)
return_error(gs_error_VMerror);
make_astruct(op, a_all | icurrent_space, sbody);
memset(sbody, 0, size);
return 0;
}
/* <int> string <string> */
int
zstring(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
byte *sbody;
uint size;
check_type(*op, t_integer);
if (op->value.intval < 0 )
return_error(gs_error_rangecheck);
if (op->value.intval > max_string_size )
return_error(gs_error_limitcheck); /* to match Distiller */
size = op->value.intval;
sbody = ialloc_string(size, "string");
if (sbody == 0)
return_error(gs_error_VMerror);
make_string(op, a_all | icurrent_space, size, sbody);
memset(sbody, 0, size);
return 0;
}
/* <name> .namestring <string> */
static int
znamestring(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
check_type(*op, t_name);
name_string_ref(imemory, op, op);
return 0;
}
/* <string> <pattern> anchorsearch <post> <match> -true- */
/* <string> <pattern> anchorsearch <string> -false- */
static int
zanchorsearch(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
os_ptr op1 = op - 1;
uint size = r_size(op);
check_read_type(*op, t_string);
check_read_type(*op1, t_string);
if (size <= r_size(op1) && !memcmp(op1->value.bytes, op->value.bytes, size)) {
os_ptr op0 = op;
push(1);
*op0 = *op1;
r_set_size(op0, size);
op1->value.bytes += size;
r_dec_size(op1, size);
make_true(op);
} else
make_false(op);
return 0;
}
/* <string> <pattern> (r)search <post> <match> <pre> -true- */
/* <string> <pattern> (r)search <string> -false- */
static int
search_impl(i_ctx_t *i_ctx_p, bool forward)
{
os_ptr op = osp;
os_ptr op1 = op - 1;
uint size = r_size(op);
uint count;
byte *pat;
byte *ptr;
byte ch;
int incr = forward ? 1 : -1;
check_read_type(*op1, t_string);
check_read_type(*op, t_string);
if (size > r_size(op1)) { /* can't match */
make_false(op);
return 0;
}
count = r_size(op1) - size;
ptr = op1->value.bytes;
if (size == 0)
goto found;
if (!forward)
ptr += count;
pat = op->value.bytes;
ch = pat[0];
do {
if (*ptr == ch && (size == 1 || !memcmp(ptr, pat, size)))
goto found;
ptr += incr;
}
while (count--);
/* No match */
make_false(op);
return 0;
found:
op->tas.type_attrs = op1->tas.type_attrs;
op->value.bytes = ptr; /* match */
op->tas.rsize = size; /* match */
push(2);
op[-1] = *op1; /* pre */
op[-3].value.bytes = ptr + size; /* post */
if (forward) {
op[-1].tas.rsize = ptr - op[-1].value.bytes; /* pre */
op[-3].tas.rsize = count; /* post */
} else {
op[-1].tas.rsize = count; /* pre */
op[-3].tas.rsize -= count + size; /* post */
}
make_true(op);
return 0;
}
/* Search from the start of the string */
static int
zsearch(i_ctx_t *i_ctx_p)
{
return search_impl(i_ctx_p, true);
}
/* Search from the end of the string */
static int
zrsearch(i_ctx_t *i_ctx_p)
{
return search_impl(i_ctx_p, false);
}
/* <string> <charstring> .stringbreak <int|null> */
static int
zstringbreak(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
uint i, j;
check_read_type(op[-1], t_string);
check_read_type(*op, t_string);
/* We can't use strpbrk here, because C doesn't allow nulls in strings. */
for (i = 0; i < r_size(op - 1); ++i)
for (j = 0; j < r_size(op); ++j)
if (op[-1].value.const_bytes[i] == op->value.const_bytes[j]) {
make_int(op - 1, i);
goto done;
}
make_null(op - 1);
done:
pop(1);
return 0;
}
/* <obj> <pattern> .stringmatch <bool> */
static int
zstringmatch(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
os_ptr op1 = op - 1;
bool result;
check_read_type(*op, t_string);
switch (r_type(op1)) {
case t_string:
check_read(*op1);
goto cmp;
case t_name:
name_string_ref(imemory, op1, op1); /* can't fail */
cmp:
result = string_match(op1->value.const_bytes, r_size(op1),
op->value.const_bytes, r_size(op),
NULL);
break;
default:
result = (r_size(op) == 1 && *op->value.bytes == '*');
}
make_bool(op1, result);
pop(1);
return 0;
}
/* ------ Initialization procedure ------ */
const op_def zstring_op_defs[] =
{
{"1.bytestring", zbytestring},
{"2anchorsearch", zanchorsearch},
{"1.namestring", znamestring},
{"2search", zsearch},
{"2rsearch", zrsearch},
{"1string", zstring},
{"2.stringbreak", zstringbreak},
{"2.stringmatch", zstringmatch},
op_def_end(0)
};
|
GitWeb