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
|
/* $OpenBSD: file.c,v 1.10 2008/10/16 22:56:32 deraadt Exp $ */
/*-
* Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <zlib.h>
#include "grep.h"
static char fname[MAXPATHLEN];
#ifndef NOZ
static char *lnbuf;
static size_t lnbuflen;
#endif
#define FILE_STDIO 0
#define FILE_MMAP 1
#define FILE_GZIP 2
struct file {
int type;
int noseek;
FILE *f;
mmf_t *mmf;
gzFile *gzf;
};
#ifndef NOZ
static char *
gzfgetln(gzFile *f, size_t *len)
{
size_t n;
int c;
for (n = 0; ; ++n) {
c = gzgetc(f);
if (c == -1) {
const char *gzerrstr;
int gzerr;
if (gzeof(f))
break;
gzerrstr = gzerror(f, &gzerr);
if (gzerr == Z_ERRNO)
err(2, "%s", fname);
else
errx(2, "%s: %s", fname, gzerrstr);
}
if (n >= lnbuflen) {
lnbuflen *= 2;
lnbuf = grep_realloc(lnbuf, ++lnbuflen);
}
if (c == '\n')
break;
lnbuf[n] = c;
}
if (gzeof(f) && n == 0)
return NULL;
*len = n;
return lnbuf;
}
#endif
file_t *
grep_fdopen(int fd, char *mode)
{
file_t *f;
if (fd == STDIN_FILENO)
snprintf(fname, sizeof fname, "(standard input)");
else
snprintf(fname, sizeof fname, "(fd %d)", fd);
f = grep_malloc(sizeof *f);
#ifndef NOZ
if (Zflag) {
f->type = FILE_GZIP;
f->noseek = lseek(fd, 0L, SEEK_SET) == -1;
if ((f->gzf = gzdopen(fd, mode)) != NULL)
return f;
} else
#endif
{
f->type = FILE_STDIO;
f->noseek = isatty(fd);
if ((f->f = fdopen(fd, mode)) != NULL)
return f;
}
free(f);
return NULL;
}
file_t *
grep_open(char *path, char *mode)
{
file_t *f;
snprintf(fname, sizeof fname, "%s", path);
f = grep_malloc(sizeof *f);
f->noseek = 0;
#ifndef NOZ
if (Zflag) {
f->type = FILE_GZIP;
if ((f->gzf = gzopen(fname, mode)) != NULL)
return f;
} else
#endif
{
/* try mmap first; if it fails, try stdio */
if ((f->mmf = mmopen(fname, mode)) != NULL) {
f->type = FILE_MMAP;
return f;
}
f->type = FILE_STDIO;
if ((f->f = fopen(path, mode)) != NULL)
return f;
}
free(f);
return NULL;
}
int
grep_bin_file(file_t *f)
{
if (f->noseek)
return 0;
switch (f->type) {
case FILE_STDIO:
return bin_file(f->f);
case FILE_MMAP:
return mmbin_file(f->mmf);
#ifndef NOZ
case FILE_GZIP:
return gzbin_file(f->gzf);
#endif
default:
/* can't happen */
errx(2, "invalid file type");
}
}
char *
grep_fgetln(file_t *f, size_t *l)
{
switch (f->type) {
case FILE_STDIO:
return fgetln(f->f, l);
case FILE_MMAP:
return mmfgetln(f->mmf, l);
#ifndef NOZ
case FILE_GZIP:
return gzfgetln(f->gzf, l);
#endif
default:
/* can't happen */
errx(2, "invalid file type");
}
}
void
grep_close(file_t *f)
{
switch (f->type) {
case FILE_STDIO:
fclose(f->f);
break;
case FILE_MMAP:
mmclose(f->mmf);
break;
#ifndef NOZ
case FILE_GZIP:
gzclose(f->gzf);
break;
#endif
default:
/* can't happen */
errx(2, "invalid file type");
}
free(f);
}
|
