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
|
#define PCRE2_CODE_UNIT_WIDTH 8
#include <pcre2.h>
#include <unistd.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
static const char *marker = "\n";
static const char *pattern = NULL;
static bool overlap = false;
static size_t group = 0;
static void
die(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fputs("bgrep: ", stderr);
vfprintf(stderr, fmt, ap);
if (fmt[strlen(fmt)-1] == ':') {
perror(NULL);
} else {
putc('\n', stderr);
}
va_end(ap);
exit(1);
}
static void
pcre2_die(int rc, const char *fmt, ...)
{
char error_buf[256];
va_list ap;
pcre2_get_error_message(rc, (uint8_t *) error_buf, sizeof(error_buf));
va_start(ap, fmt);
fputs("bgrep: ", stderr);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "%s\n", error_buf);
va_end(ap);
exit(1);
}
static void
writeall(uint8_t *data, size_t size)
{
size_t sent;
ssize_t n;
sent = 0;
while (sent != size) {
n = write(1, data + sent, size - sent);
if (n < 0) die("write:");
if (!n) break;
sent += (size_t) n;
}
}
static void
writef(const char *fmt, ...)
{
static void *buf = NULL;
static size_t bufsize = 0;
va_list ap;
va_list cpy;
size_t size;
va_start(ap, fmt);
va_copy(cpy, ap);
size = vsnprintf(NULL, 0, fmt, ap);
if (!bufsize || size + 1 > bufsize) {
bufsize = size + 1;
buf = realloc(buf, bufsize);
if (!buf) die("realloc:");
}
va_end(ap);
va_start(cpy, fmt);
vsnprintf(buf, bufsize, fmt, cpy);
va_end(cpy);
writeall(buf, size);
}
void
parse(int argc, const char **argv)
{
const char **arg;
if (argc < 2) goto usage;
for (arg = argv + 1; *arg; arg++) {
if (!strcmp(*arg, "-h") || !strcmp(*arg, "--help")) {
goto usage;
} else if (!strcmp(*arg, "-g") || !strcmp(*arg, "--group")) {
group = strtoul(*++arg, NULL, 0);
} else if (!strcmp(*arg, "-m") || !strcmp(*arg, "--marker")) {
marker = *++arg;
} else if (!strcmp(*arg, "-o") || !strcmp(*arg, "--overlap")) {
overlap = true;
} else {
if (pattern) goto usage;
pattern = *arg;
}
}
return;
usage:
fprintf(stderr, "Usage: bgrep [-g GROUP] [-m MARKER] REGEX\n");
exit(1);
}
int
main(int argc, const char **argv)
{
pcre2_match_data *match_data;
pcre2_code *regex = NULL;
uint8_t *match;
uint8_t *file;
size_t *ovector;
size_t filesize;
size_t filecap;
size_t match_size;
size_t error_offset = 0;
size_t offset;
size_t length;
size_t pos;
size_t lastmatch;
ssize_t n;
int rc;
parse(argc, argv);
regex = pcre2_compile((PCRE2_SPTR8)pattern, strlen(pattern),
PCRE2_MATCH_INVALID_UTF, &rc, &error_offset, NULL);
if (!regex) pcre2_die(rc, "bad regex (..'%s')", argv[argc-1] + error_offset);
match_data = pcre2_match_data_create_from_pattern(regex, NULL);
if (!match_data) die("pcre2_match_data_create_from_pattern");
filecap = BUFSIZ;
filesize = 0;
file = malloc(filecap);
if (!file) die("mallo:");
pos = 0;
lastmatch = 0;
while (true) {
if (BUFSIZ > filecap - filesize) {
filecap *= 2;
file = realloc(file, filecap);
if (!file) die("realloc:");
}
n = read(0, file + filesize, BUFSIZ);
if (n < 0) die("read:");
if (!n) break;
length = (size_t) n;
offset = 0;
while (offset != length) {
rc = pcre2_match(regex, file, filesize + length, lastmatch,
PCRE2_NOTEMPTY, match_data, NULL);
if (rc < 0 && rc != PCRE2_ERROR_NOMATCH)
pcre2_die(rc, "pcre2_match: ");
if (rc != PCRE2_ERROR_NOMATCH) {
rc = pcre2_substring_get_bynumber(match_data,
group, &match, &match_size);
if (rc) pcre2_die(rc, "pcre2_substring_get_byname: ");
ovector = pcre2_get_ovector_pointer(match_data);
if (overlap) {
lastmatch = ovector[0] + 1;
} else {
lastmatch = ovector[1];
}
writef("0x%zx:", filesize + ovector[0]);
writeall(match, match_size);
writef("%s", marker);
} else {
break;
}
}
filesize += length;
}
pcre2_match_data_free(match_data);
pcre2_code_free(regex);
return 0;
}
|
