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
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
|
/* Zgrep - search compressed files for a regular expression
Copyright (C) 2010-2016 Antonio Diaz Diaz.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define _FILE_OFFSET_BITS 64
#include <cerrno>
#include <climits>
#include <csignal>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <list>
#include <string>
#include <vector>
#include <dirent.h>
#include <fcntl.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/stat.h>
#if defined(__MSVCRT__) || defined(__OS2__)
#include <io.h>
#endif
#include "arg_parser.h"
#include "rc.h"
#include "zutils.h"
namespace {
#include "recursive.cc"
#include "zcatgrep.cc"
void show_help()
{
std::printf( "Zgrep is a front end to the grep program that allows transparent search\n"
"on any combination of compressed and uncompressed files. If any given\n"
"file is compressed, its decompressed content is used. If a given file\n"
"does not exist, and its name does not end with one of the known\n"
"extensions, zgrep tries the compressed file names corresponding to the\n"
"supported formats.\n"
"\nIf no files are specified, or if a file is specified as '-', data is\n"
"read from standard input, decompressed if needed, and fed to grep. Data\n"
"read from standard input must be of the same type; all uncompressed or\n"
"all in the same compression format.\n"
"\nThe supported formats are bzip2, gzip, lzip and xz.\n"
"\nUsage: zgrep [options] <pattern> [files]\n"
"\nExit status is 0 if match, 1 if no match, 2 if trouble.\n"
"\nOptions:\n"
" --help display this help and exit\n"
" -V, --version output version information and exit\n"
" -a, --text treat all files as text\n"
" -A, --after-context=<n> print <n> lines of trailing context\n"
" -b, --byte-offset print the byte offset of each line\n"
" -B, --before-context=<n> print <n> lines of leading context\n"
" -c, --count only print a count of matching lines per file\n"
" -C, --context=<n> print <n> lines of output context\n"
" -e, --regexp=<pattern> use <pattern> as the pattern to match\n"
" -E, --extended-regexp <pattern> is an extended regular expression\n"
" -f, --file=<file> obtain patterns from <file>\n"
" -F, --fixed-strings <pattern> is a set of newline-separated strings\n"
" -h, --no-filename suppress the prefixing filename on output\n"
" -H, --with-filename print the filename for each match\n"
" -i, --ignore-case ignore case distinctions\n"
" -I ignore binary files\n"
" -l, --files-with-matches only print names of files containing matches\n"
" -L, --files-without-match only print names of files containing no matches\n"
" -m, --max-count=<n> stop after <n> matches\n"
" -M, --format=<list> process only the formats in <list>\n"
" -n, --line-number print the line number of each line\n"
" -N, --no-rcfile don't read runtime configuration file\n"
" -o, --only-matching show only the part of a line matching <pattern>\n"
" -O, --force-format=<fmt> force given format (bz2, gz, lz, xz)\n"
" -q, --quiet suppress all messages\n"
" -r, --recursive operate recursively on directories\n"
" -s, --no-messages suppress error messages\n"
" -v, --invert-match select non-matching lines\n"
" --verbose verbose mode (show error messages)\n"
" -w, --word-regexp match only whole words\n"
" -x, --line-regexp match only whole lines\n"
" --bz2=<command> set compressor and options for bzip2 format\n"
" --gz=<command> set compressor and options for gzip format\n"
" --lz=<command> set compressor and options for lzip format\n"
" --xz=<command> set compressor and options for xz format\n"
"Numbers may be followed by a multiplier: k = kB = 10^3 = 1000,\n"
"Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc...\n" );
show_help_addr();
}
int zgrep_stdin( int infd, const int format_index,
const std::vector< const char * > & grep_args )
{
Children children;
if( !set_data_feeder( &infd, children, format_index ) ) return 2;
const pid_t grep_pid = fork();
if( grep_pid == 0 ) // child (grep)
{
if( dup2( infd, STDIN_FILENO ) >= 0 && close( infd ) == 0 )
{
const char ** const argv = new const char *[grep_args.size()+2];
argv[0] = GREP;
for( unsigned i = 0; i < grep_args.size(); ++i )
argv[i+1] = grep_args[i];
argv[grep_args.size()+1] = 0;
execvp( argv[0], (char **)argv );
}
show_exec_error( GREP );
_exit( 2 );
}
if( grep_pid < 0 ) // parent
{ show_fork_error( GREP ); return 2; }
int retval = wait_for_child( grep_pid, GREP );
if( !good_status( children, retval == 1 ) ) retval = 2;
if( close( infd ) != 0 )
{ show_close_error(); return 2; }
return retval;
}
int zgrep_file( int infd, const int format_index,
const std::string & input_filename,
const std::vector< const char * > & grep_args,
const int list_mode, const bool show_name )
{
Children children;
if( !set_data_feeder( &infd, children, format_index ) ) return 2;
int fda[2]; // pipe from grep
if( pipe( fda ) < 0 )
{ show_error( "Can't create pipe", errno ); return 2; }
const pid_t grep_pid = fork();
if( grep_pid == 0 ) // child (grep)
{
if( dup2( infd, STDIN_FILENO ) >= 0 &&
dup2( fda[1], STDOUT_FILENO ) >= 0 &&
close( infd ) == 0 && close( fda[0] ) == 0 && close( fda[1] ) == 0 )
{
const char ** const argv = new const char *[grep_args.size()+2];
argv[0] = GREP;
for( unsigned i = 0; i < grep_args.size(); ++i )
argv[i+1] = grep_args[i];
argv[grep_args.size()+1] = 0;
execvp( argv[0], (char **)argv );
}
show_exec_error( GREP );
_exit( 2 );
}
if( grep_pid < 0 ) // parent
{ show_fork_error( GREP ); return 2; }
close( fda[1] );
enum { buffer_size = 256 };
uint8_t buffer[buffer_size];
bool line_begin = true;
while( true )
{
const int size = readblock( fda[0], buffer, buffer_size );
if( size != buffer_size && errno )
{ show_error( "Read error", errno ); return 2; }
if( size > 0 && !list_mode )
{
if( show_name )
for( int i = 0; i < size; ++i )
{
if( line_begin )
{ line_begin = false; std::printf( "%s:", input_filename.c_str() ); }
if( buffer[i] == '\n' ) line_begin = true;
putchar( buffer[i] );
}
else if( std::fwrite( buffer, 1, size, stdout ) != (unsigned)size )
{ show_error( "Write error", errno ); return 2; }
}
if( size < buffer_size ) break;
}
int retval = wait_for_child( grep_pid, GREP );
if( !good_status( children, retval == 1 ) ) retval = 2;
if( list_mode && (retval == 0) == (list_mode == 1) )
std::printf( "%s\n", input_filename.c_str() );
if( close( infd ) != 0 )
{ show_close_error(); return 2; }
if( close( fda[0] ) != 0 )
{ show_close_error( GREP ); return 2; }
return retval;
}
} // end namespace
int main( const int argc, const char * const argv[] )
{
enum { help_opt = 256, verbose_opt, bz2_opt, gz_opt, lz_opt, xz_opt };
int format_index = -1;
int infd = -1;
int list_mode = 0; // 1 = list matches, -1 = list non matches
int show_name = -1; // tri-state bool
bool no_messages = false;
bool recursive = false;
std::string input_filename;
std::list< std::string > filenames;
std::vector< const char * > grep_args; // args to grep, maybe empty
invocation_name = argv[0];
program_name = "zgrep";
const Arg_parser::Option options[] =
{
{ 'a', "text", Arg_parser::no }, // grep GNU
{ 'A', "after-context", Arg_parser::yes }, // grep GNU
{ 'b', "byte-offset", Arg_parser::no }, // grep GNU
{ 'B', "before-context", Arg_parser::yes }, // grep GNU
{ 'c', "count", Arg_parser::no }, // grep
{ 'C', "context", Arg_parser::yes }, // grep GNU
{ 'e', "regexp", Arg_parser::yes }, // grep
{ 'E', "extended-regexp", Arg_parser::no }, // grep
{ 'f', "file ", Arg_parser::yes }, // grep
{ 'F', "fixed-strings", Arg_parser::no }, // grep
{ 'h', "no-filename", Arg_parser::no }, // grep GNU
{ 'H', "with-filename", Arg_parser::no }, // grep GNU
{ 'i', "ignore-case", Arg_parser::no }, // grep
{ 'I', 0, Arg_parser::no }, // grep GNU
{ 'l', "files-with-matches", Arg_parser::no }, // grep
{ 'L', "files-without-match", Arg_parser::no }, // grep GNU
{ 'm', "max-count", Arg_parser::yes }, // grep GNU
{ 'M', "format", Arg_parser::yes },
{ 'n', "line-number", Arg_parser::no }, // grep
{ 'N', "no-rcfile", Arg_parser::no },
{ 'o', "only-matching", Arg_parser::no }, // grep
{ 'O', "force-format", Arg_parser::yes },
{ 'q', "quiet", Arg_parser::no },
{ 'r', "recursive", Arg_parser::no },
{ 's', "no-messages", Arg_parser::no }, // grep
{ 'v', "invert-match", Arg_parser::no }, // grep
{ 'V', "version", Arg_parser::no },
{ 'w', "word-regexp", Arg_parser::no }, // grep GNU
{ 'x', "line-regexp", Arg_parser::no }, // grep
{ help_opt, "help", Arg_parser::no },
{ verbose_opt, "verbose", Arg_parser::no },
{ bz2_opt, "bz2", Arg_parser::yes },
{ gz_opt, "gz", Arg_parser::yes },
{ lz_opt, "lz", Arg_parser::yes },
{ xz_opt, "xz", Arg_parser::yes },
{ 0 , 0, Arg_parser::no } };
const Arg_parser parser( argc, argv, options );
if( parser.error().size() ) // bad option
{ show_error( parser.error().c_str(), 0, true ); return 2; }
maybe_process_config_file( parser );
int argind = 0;
bool pattern_found = false;
for( ; argind < parser.arguments(); ++argind )
{
const int code = parser.code( argind );
if( !code ) break; // no more options
const std::string & arg = parser.argument( argind );
switch( code )
{
case 'a': grep_args.push_back( "-a" ); break;
case 'A': grep_args.push_back( "-A" );
grep_args.push_back( arg.c_str() ); break;
case 'b': grep_args.push_back( "-b" ); break;
case 'B': grep_args.push_back( "-B" );
grep_args.push_back( arg.c_str() ); break;
case 'c': grep_args.push_back( "-c" ); break;
case 'C': grep_args.push_back( "-C" );
grep_args.push_back( arg.c_str() ); break;
case 'e': grep_args.push_back( "-e" );
grep_args.push_back( arg.c_str() ); pattern_found = true; break;
case 'E': grep_args.push_back( "-E" ); break;
case 'f': grep_args.push_back( "-f" );
grep_args.push_back( arg.c_str() ); pattern_found = true; break;
case 'F': grep_args.push_back( "-F" ); break;
case 'h': show_name = false; break;
case 'H': show_name = true; break;
case 'i': grep_args.push_back( "-i" ); break;
case 'I': grep_args.push_back( "-I" ); break;
case 'l': grep_args.push_back( "-l" ); list_mode = 1; break;
case 'L': grep_args.push_back( "-L" ); list_mode = -1; break;
case 'm': grep_args.push_back( "-m" );
grep_args.push_back( arg.c_str() ); break;
case 'M': parse_format_list( arg ); break;
case 'n': grep_args.push_back( "-n" ); break;
case 'N': break;
case 'o': grep_args.push_back( "-o" ); break;
case 'O': format_index = parse_format_type( arg ); break;
case 'q': grep_args.push_back( "-q" ); verbosity = -1; break;
case 'r': recursive = true; break;
case 's': grep_args.push_back( "-s" ); no_messages = true; break;
case 'v': grep_args.push_back( "-v" ); break;
case 'V': show_version(); return 0;
case 'w': grep_args.push_back( "-w" ); break;
case 'x': grep_args.push_back( "-x" ); break;
case help_opt : show_help(); return 0;
case verbose_opt: if( verbosity < 4 ) ++verbosity;
no_messages = false; break;
case bz2_opt: parse_compressor( arg, fmt_bz2 ); break;
case gz_opt: parse_compressor( arg, fmt_gz ); break;
case lz_opt: parse_compressor( arg, fmt_lz ); break;
case xz_opt: parse_compressor( arg, fmt_xz ); break;
default : internal_error( "uncaught option." );
}
} // end process options
#if defined(__MSVCRT__) || defined(__OS2__)
setmode( STDIN_FILENO, O_BINARY );
setmode( STDOUT_FILENO, O_BINARY );
#endif
if( !pattern_found )
{
if( argind >= parser.arguments() )
{ show_error( "Pattern not found." ); return 2; }
const std::string & arg = parser.argument( argind++ );
if( arg.size() && arg[0] == '-' ) grep_args.push_back( "-e" );
grep_args.push_back( arg.c_str() );
}
for( ; argind < parser.arguments(); ++argind )
filenames.push_back( parser.argument( argind ) );
if( filenames.empty() ) filenames.push_back( "-" );
if( show_name < 0 ) show_name = ( filenames.size() != 1 || recursive );
int retval = 1;
bool error = false;
bool stdin_used = false;
while( next_filename( filenames, input_filename, error, recursive,
false, no_messages ) )
{
if( input_filename.empty() )
{
if( stdin_used ) continue; else stdin_used = true;
infd = STDIN_FILENO;
}
else
{
infd = open_instream( input_filename, format_index < 0, no_messages );
if( infd < 0 ) { error = true; continue; }
}
int tmp;
if( infd == STDIN_FILENO )
tmp = zgrep_stdin( infd, format_index, grep_args );
else tmp = zgrep_file( infd, format_index, input_filename, grep_args,
list_mode, show_name );
if( tmp == 0 || ( tmp == 2 && retval == 1 ) ) retval = tmp;
if( input_filename.size() ) { close( infd ); infd = -1; }
if( retval == 0 && verbosity < 0 ) break;
}
if( std::fclose( stdout ) != 0 )
{
show_error( "Can't close stdout", errno );
error = true;
}
if( error && ( retval != 0 || verbosity >= 0 ) ) retval = 2;
return retval;
}
|
