| 0,0 → 1,186 |
|---|
| /* Copyright (c) 2008, Tim Post <tinkertim@gmail.com> |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * |
| * 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. |
| * |
| * Neither the name of the original program's authors nor the names of its |
| * contributors may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <getopt.h> |
| #include <string.h> |
| #include <fcntl.h> |
| |
| #include "config.h" |
| #include "util.h" |
| #include "errors.h" |
| #include "entry.h" |
| #include "cat.h" |
| #include "cmds.h" |
| |
| static char *cmdname = "cat"; |
| #define CAT_VERSION "0.0.1" |
| #define CAT_DEFAULT_BUFLEN 1024 |
| |
| static char *cat_oops = "That option is not yet supported\n"; |
| |
| static struct option const long_options[] = { |
| { "help", no_argument, 0, 'h' }, |
| { "version", no_argument, 0, 'v' }, |
| { "head", required_argument, 0, 'H' }, |
| { "tail", required_argument, 0, 't' }, |
| { "buffer", required_argument, 0, 'b' }, |
| { "more", no_argument, 0, 'm' }, |
| { 0, 0, 0, 0 } |
| }; |
| |
| /* Dispays help for cat in various levels */ |
| void * help_cmd_cat(unsigned int level) |
| { |
| if (level == HELP_SHORT) { |
| printf("`%s' shows the contents of files\n", cmdname); |
| } else { |
| help_cmd_cat(HELP_SHORT); |
| printf( |
| "Usage: %s [options] <file1> [file2] [...]\n" |
| "Options:\n" |
| " -h, --help A short option summary\n" |
| " -v, --version Print version information and exit\n" |
| " -H, --head ## Print only the first ## bytes\n" |
| " -t, --tail ## Print only the last ## bytes\n" |
| " -b, --buffer ## Set the read buffer size to ##\n" |
| " -m, --more Pause after each screen full\n" |
| "Currently, %s is under development, some options don't work.\n", |
| cmdname, cmdname); |
| } |
| |
| return CMD_VOID; |
| } |
| |
| static unsigned int cat_file(const char *fname, size_t blen) |
| { |
| int fd, bytes = 0, count = 0, reads = 0; |
| off_t total = 0; |
| char *buff = NULL; |
| |
| if (-1 == (fd = open(fname, O_RDONLY))) { |
| printf("Unable to open %s\n", fname); |
| return 1; |
| } |
| |
| total = lseek(fd, 0, SEEK_END); |
| lseek(fd, 0, SEEK_SET); |
| |
| if (NULL == (buff = (char *) malloc(blen + 1))) { |
| close(fd); |
| printf("Unable to allocate enough memory to read %s\n", |
| fname); |
| return 1; |
| } |
| |
| do { |
| memset(buff, 0, sizeof(buff)); |
| bytes = read(fd, buff, blen); |
| if (bytes > 0) { |
| count += bytes; |
| if (bytes < blen) |
| buff[bytes] = '\0'; |
| printf(buff); |
| reads++; |
| } |
| } while (bytes > 0); |
| |
| close(fd); |
| if (bytes == -1) { |
| printf("Error reading %s\n", fname); |
| free(buff); |
| return 1; |
| } |
| |
| /* Debug stuff, newline not added purposefully */ |
| printf("** %s is a file with the size of %ld bytes\n", |
| fname, total); |
| printf( "** %d bytes were read in a buffer of %d bytes in %d reads\n", |
| count, blen, reads); |
| printf("** Read %s\n", count == total ? "Succeeded" : "Failed"); |
| free(buff); |
| |
| return 0; |
| } |
| |
| /* Main entry point for cat, accepts an array of arguments */ |
| int * cmd_cat(char **argv) |
| { |
| unsigned int argc, i, ret = 0, buffer = 0; |
| int c, opt_ind; |
| |
| argc = cli_count_args(argv); |
| |
| for (c = 0, optind = 0, opt_ind = 0; c != -1;) { |
| c = getopt_long(argc, argv, "hvmH:t:b:", long_options, &opt_ind); |
| switch (c) { |
| case 'h': |
| help_cmd_cat(HELP_LONG); |
| return CMD_SUCCESS; |
| case 'v': |
| printf("%s\n", CAT_VERSION); |
| return CMD_SUCCESS; |
| case 'H': |
| printf(cat_oops); |
| return CMD_FAILURE; |
| case 't': |
| printf(cat_oops); |
| return CMD_FAILURE; |
| case 'b': |
| printf(cat_oops); |
| break; |
| case 'm': |
| printf(cat_oops); |
| return CMD_FAILURE; |
| } |
| } |
| |
| argc -= optind; |
| |
| if (argc < 1) { |
| printf("%s - incorrect number of arguments. Try `%s --help'\n", |
| cmdname, cmdname); |
| return CMD_FAILURE; |
| } |
| |
| if (buffer <= 0) |
| buffer = CAT_DEFAULT_BUFLEN; |
| |
| for (i = optind; argv[i] != NULL; i++) |
| ret += cat_file(argv[i], buffer); |
| |
| if (ret) |
| return CMD_FAILURE; |
| else |
| return CMD_SUCCESS; |
| } |
| |