110 lines
2.7 KiB
C++
110 lines
2.7 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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cat.cpp
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Concatenate files and print on the standard output.
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*******************************************************************************/
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <error.h>
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int docat(const char* inputname, int fd)
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{
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do
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{
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const size_t BUFFER_SIZE = 255;
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char buffer[BUFFER_SIZE+1];
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ssize_t bytesread = read(fd, buffer, BUFFER_SIZE);
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if ( bytesread == 0 ) { break; }
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if ( bytesread < 0 )
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{
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error(0, errno, "read: %s", inputname);
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return 1;
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}
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if ( (ssize_t) writeall(1, buffer, bytesread) < bytesread )
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{
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error(0, errno, "write: <stdout>", inputname);
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return 1;
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}
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} while ( true );
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return 0;
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}
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void usage(FILE* fp, const char* argv0)
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{
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fprintf(fp, "usage: %s [FILE ...]\n", argv0);
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fprintf(fp, "Concatenate files and print on the standard output.\n");
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}
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void help(FILE* fp, const char* argv0)
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{
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return usage(fp, argv0);
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}
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void version(FILE* fp, const char* argv0)
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{
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return usage(fp, argv0);
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}
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int main(int argc, char* argv[])
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{
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const char* argv0 = argv[0];
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' ) { continue; }
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argv[i] = NULL;
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if ( !strcmp(arg, "--") ) { break; }
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if ( !strcmp(arg, "--help") ) { help(stdout, argv0); exit(0); }
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if ( !strcmp(arg, "--usage") ) { usage(stdout, argv0); exit(0); }
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if ( !strcmp(arg, "--version") ) { version(stdout, argv0); exit(0); }
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error(0, 0, "unrecognized option: %s", arg);
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usage(stderr, argv0);
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exit(1);
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}
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int result = 0;
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bool any = false;
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for ( int i = 1; i < argc; i++ )
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{
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if ( !argv[i] ) { continue; }
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any = true;
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int fd = open(argv[i], O_RDONLY);
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if ( fd < 0 )
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{
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error(0, errno, "%s", argv[i]);
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result = 1;
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continue;
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}
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result |= docat(argv[i], fd);
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close(fd);
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}
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if ( !any ) { result = docat("<stdin>", 0); }
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return result;
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}
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