diff options
Diffstat (limited to 'zgrep.cc')
| -rw-r--r-- | zgrep.cc | 54 |
1 files changed, 29 insertions, 25 deletions
@@ -1,18 +1,18 @@ -/* Zgrep - search compressed files for a regular expression - Copyright (C) 2010-2019 Antonio Diaz Diaz. +/* Zgrep - search compressed files for a regular expression + Copyright (C) 2010-2020 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 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. + 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/>. + 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 @@ -47,21 +47,23 @@ namespace { 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" + std::printf( "zgrep is a front end to the program grep that allows transparent search\n" + "on any combination of compressed and uncompressed files. If any file\n" + "given is compressed, its decompressed content is used. If a file given\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" - "formats supported.\n" + "formats supported. If a file fails to decompress, zgrep continues\n" + "searching the rest of the files.\n" "\nIf a file is specified as '-', data are read from standard input,\n" "decompressed if needed, and fed to grep. Data read from standard input\n" "must be of the same type; all uncompressed or all in the same\n" - "compression format.\n" + "compressed format.\n" "\nIf no files are specified, recursive searches examine the current\n" "working directory, and nonrecursive searches read standard input.\n" - "\nThe formats supported are bzip2, gzip, lzip and xz.\n" + "\nThe formats supported 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" + "Some options only work if the grep program used supports them.\n" "\nOptions:\n" " --help display this help and exit\n" " -V, --version output version information and exit\n" @@ -87,7 +89,7 @@ void show_help() " -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" + " -O, --force-format=<fmt> force the format given (bz2, gz, lz, xz)\n" " -q, --quiet suppress all messages\n" " -r, --recursive operate recursively on directories\n" " -R, --dereference-recursive recursively follow symbolic links\n" @@ -100,7 +102,7 @@ void show_help() " --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" + "\nNumbers 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(); } @@ -217,15 +219,15 @@ int main( const int argc, const char * const argv[] ) enum { help_opt = 256, verbose_opt, color_opt, bz2_opt, gz_opt, lz_opt, xz_opt }; int format_index = -1; - int list_mode = 0; // 1 = list matches, -1 = list non matches + int list_mode = 0; // 1 = list matches, -1 = list non-matches int recursive = 0; // 1 = '-r', 2 = '-R' int show_name = -1; // tri-state bool bool no_messages = false; std::list< std::string > filenames; std::vector< const char * > grep_args; // args to grep, maybe empty std::string color_option; // needed because of optional arg - invocation_name = argv[0]; program_name = "zgrep"; + invocation_name = ( argc > 0 ) ? argv[0] : program_name; const Arg_parser::Option options[] = { @@ -365,10 +367,10 @@ int main( const int argc, const char * const argv[] ) false, no_messages ) ) { int infd; - if( input_filename.empty() ) + if( input_filename == "." ) { if( stdin_used ) continue; else stdin_used = true; - infd = STDIN_FILENO; + infd = STDIN_FILENO; input_filename = "-"; } else { @@ -383,7 +385,9 @@ int main( const int argc, const char * const argv[] ) list_mode, show_name ); if( tmp == 0 || ( tmp == 2 && retval == 1 ) ) retval = tmp; - if( input_filename.size() ) close( infd ); + if( close( infd ) != 0 ) + { show_file_error( input_filename.c_str(), "Error closing input file", + errno ); error = true; } if( retval == 0 && verbosity < 0 ) break; } |