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
|
/*
* BSD Zero Clause License
*
* Copyright (c) 2023 Thomas Voss
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#define PCRE2_CODE_UNIT_WIDTH 8
#define _POSIX_C_SOURCE 200809L
#include <sys/mman.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pcre2.h>
#define die(...) err(EXIT_FAILURE, __VA_ARGS__)
#define streq(a, b) (strcmp(a, b) == 0)
int rv = EXIT_SUCCESS;
const char *argv0;
static PCRE2_UCHAR errbuf[256];
static int loadfile(char **, char *);
static char *stdio_to_string(void);
static void fsub(char *, pcre2_match_data *, pcre2_code *, char *);
int
main(int argc, char *argv[])
{
int fd = 0, fd2, ec, opt;
char *needle, *haystack, *repl,
*argv0 = argv[0],
*optstr = "dim",
*progargs = "[-dim] pattern basefile [file ...]";
uint32_t rx_opts = PCRE2_UTF;
pcre2_code *rx;
pcre2_match_data *mdata;
PCRE2_SIZE eo;
static struct option longopts[] = {
{"dotall", no_argument, NULL, 'd'},
{"ignore-case", no_argument, NULL, 'i'},
{"multiline", no_argument, NULL, 'm'},
{ NULL, 0, NULL, 0 }
};
argv0 = argv[0];
while ((opt = getopt_long(argc, argv, optstr, longopts, NULL)) != -1) {
switch (opt) {
case 'd':
rx_opts |= PCRE2_DOTALL;
break;
case 'i':
rx_opts |= PCRE2_CASELESS;
break;
case 'm':
rx_opts |= PCRE2_MULTILINE;
break;
default:
fprintf(stderr, "Usage: %s %s\n", argv0, progargs);
exit(EXIT_FAILURE);
}
}
argc -= optind;
argv += optind;
if (argc < 2) {
fprintf(stderr, "Usage: %s %s\n", argv0, progargs);
exit(EXIT_FAILURE);
}
needle = argv[0];
if (streq(argv[1], "-"))
repl = stdio_to_string();
else
fd = loadfile(&repl, argv[1]);
rx = pcre2_compile((PCRE2_SPTR) needle, PCRE2_ZERO_TERMINATED,
rx_opts, &ec, &eo, NULL);
if (rx == NULL) {
pcre2_get_error_message(ec, errbuf, sizeof(errbuf));
fprintf(stderr,
"%s: Regex compilation failed at offset %d: %s\n",
argv[0], (int) eo, errbuf);
exit(EXIT_FAILURE);
}
mdata = pcre2_match_data_create_from_pattern(rx, NULL);
for (int i = 2; i < argc; i++) {
if (streq(argv[i], "-")) {
haystack = stdio_to_string();
fsub(haystack, mdata, rx, repl);
free(haystack);
} else {
fd2 = loadfile(&haystack, argv[i]);
fsub(haystack, mdata, rx, repl);
close(fd2);
}
}
pcre2_match_data_free(mdata);
pcre2_code_free(rx);
if (!streq(argv[1], "-"))
close(fd);
return rv;
}
int
loadfile(char **s, char *filename)
{
int fd;
struct stat sb;
if ((fd = open(filename, O_RDONLY)) == -1)
die("open: %s", filename);
if (fstat(fd, &sb) == -1)
die("fstat: %s", filename);
*s = mmap(0, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (*s == MAP_FAILED)
die("mmap: %s", filename);
return fd;
}
char *
stdio_to_string(void)
{
char *buf = NULL;
size_t bs = 0;
getdelim(&buf, &bs, EOF, stdin);
return buf;
}
void
fsub(char *haystack, pcre2_match_data *mdata, pcre2_code *rx, char *repl)
{
int rc;
size_t pos = 0;
PCRE2_SPTR haystack_start = (PCRE2_SPTR) haystack;
PCRE2_SIZE *ovec;
(void) repl;
do {
rc = pcre2_match(rx, haystack_start, PCRE2_ZERO_TERMINATED, pos,
0, mdata, NULL);
if (rc == PCRE2_ERROR_NOMATCH) {
if (pos == 0)
rv = EXIT_FAILURE;
break;
}
if (rc < 0) {
fprintf(stderr,
"%s: pcre2_match() failed with code %d\n",
argv0, rc);
pcre2_match_data_free(mdata);
pcre2_code_free(rx);
exit(EXIT_FAILURE);
}
ovec = pcre2_get_ovector_pointer(mdata);
printf("%.*s%s", (int) (ovec[0] - pos), haystack_start + pos,
repl);
pos = ovec[1];
} while (rc >= 0);
fputs((char *) haystack_start + pos, stdout);
}
|
