0,0 → 1,180 |
/* 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; |
} |
|
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; |
} |
|
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; |
} |
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