Repository navigation
Expand file tree
/
Copy pathconfsplit.c
More file actions
194 lines (178 loc) · 4.3 KB
/
Copy pathconfsplit.c
File metadata and controls
194 lines (178 loc) · 4.3 KB
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
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
//#define TOK_1 "mode_cfg"
//#define TOK_2 "wins4"
#define TOK_1 "\twins4 255.255.255.255;"
#ifdef DEBUG
static int
creat_chunk(void)
{
static int n = 0;
int fd;
char tmp[256];
snprintf(tmp, sizeof(tmp), "chunk-%04d", n++);
fd = creat(tmp, 0644);
assert(fd != -1);
return fd;
}
#endif
static int
is_tok_2(const char *map, const char *end)
{
#ifdef TOK_2
while (map < end && (isblank(*map) || *map == '\n' || *map == '{')) { //}
map++;
}
assert(map < end);
return !memcmp(map, TOK_2, sizeof(TOK_2) - 1);
#else
(void)(map && end);
return 1;
#endif
}
static int
testconf(const char *infile)
{
int rv;
int fd;
struct stat st;
char *map, *base, *end;
size_t sz;
fd = open(infile, O_RDONLY);
assert(fd != -1);
rv = fstat(fd, &st);
assert(rv == 0);
map = mmap(NULL, st.st_size, PROT_READ, MAP_FILE | MAP_PRIVATE, fd, 0);
assert(map != MAP_FAILED);
close(fd);
base = map;
end = map + st.st_size;
sz = st.st_size;
rv = -1;
while (1) {
char *p, *q;
assert(base + sz == end);
p = memchr(base, '\"', sz);
if (!p) {
rv = 0;
break;
}
// open quote: p - map
if (p < map + 8 || memcmp(p - 8, "\tbanner ", 8)) {
fprintf(stderr, "error: bad open quote at %zu\n", p - map);
break;
}
sz -= ++p - base;
assert(p + sz == end);
q = memchr(p, '\"', sz);
if (!q) {
fprintf(stderr, "error: unbalanced quote at %zu\n", p - map);
break;
}
// close quote: q - map
if (q + 2 >= end || q[1] != ';' || q[2] != '\n') {
fprintf(stderr, "error: bad close quote at %zu\n", q - map);
break;
}
sz -= ++q - p;
base = q;
}
munmap(map, st.st_size);
return rv;
}
int
main(int argc, char **argv)
{
int rv;
int fd;
struct stat st;
char *map, *fill, a;
size_t inptr, outptr, chunk;
const char *infile, *outfile;
#ifdef DEBUG
infile = "conf";
outfile = "conf.out";
chunk = 4500;
#else
if (argc < 4) {
fprintf(stderr, "usage: %s infile outfile split\n", argv[0]);
return -1;
}
infile = argv[1];
outfile = argv[2];
chunk = strtoull(argv[3], NULL, 0);
#endif
rv = testconf(infile);
if (rv) {
return -1;
}
a = '\n';
fill = malloc(chunk);
assert(fill);
memset(fill, '#', chunk);
fd = open(infile, O_RDONLY);
assert(fd != -1);
rv = fstat(fd, &st);
assert(rv == 0);
map = mmap(NULL, st.st_size, PROT_READ, MAP_FILE | MAP_PRIVATE, fd, 0);
assert(map != MAP_FAILED);
close(fd);
fd = creat(outfile, 0644);
assert(fd);
inptr = 0;
outptr = 0;
while (1) {
size_t base = inptr;
size_t end = inptr + chunk;
if (end > (size_t)st.st_size) {
#ifdef DEBUG
int fdo = creat_chunk();
write(fdo, map + base, st.st_size - base);
close(fdo);
#endif
write(fd, map + base, st.st_size - base);
break;
}
inptr = end;
while (1) {
while (inptr > base && memcmp(map + inptr, TOK_1, sizeof(TOK_1) - 1)) {
inptr--;
}
assert(inptr > base);
if (is_tok_2(map + inptr + sizeof(TOK_1) - 1, map + st.st_size)) {
#ifdef DEBUG
int fdo = creat_chunk();
write(fdo, map + base, inptr - base);
printf("split @%zu (fill %zu)\n", inptr, end - inptr);
#endif
write(fd, map + base, inptr - base);
if (end > inptr) {
#ifdef DEBUG
write(fdo, fill, end - inptr - 1);
write(fdo, &a, 1);
close(fdo);
#endif
write(fd, fill, end - inptr - 1);
write(fd, &a, 1);
}
outptr += chunk;
break;
}
inptr--;
#ifdef DEBUG
printf("retry @%zu\n", inptr);
#endif
}
}
close(fd);
munmap(map, st.st_size);
free(fill);
return 0;
}