Subversion Repositories HelenOS

Rev

Rev 3386 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
3356 post 1
/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
2
 * All rights reserved.
3277 post 3
 *
3356 post 4
 * Redistribution and use in source and binary forms, with or without
5
 * modification, are permitted provided that the following conditions are met:
6
 *
7
 * Redistributions of source code must retain the above copyright notice, this
8
 * list of conditions and the following disclaimer.
9
 *
10
 * Redistributions in binary form must reproduce the above copyright notice,
11
 * this list of conditions and the following disclaimer in the documentation
12
 * and/or other materials provided with the distribution.
13
 *
14
 * Neither the name of the original program's authors nor the names of its
15
 * contributors may be used to endorse or promote products derived from this
16
 * software without specific prior written permission.
17
 *
18
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28
 * POSSIBILITY OF SUCH DAMAGE.
29
 */
3277 post 30
 
31
#include <stdio.h>
32
#include <stdlib.h>
3356 post 33
#include <unistd.h>
3319 post 34
#include <getopt.h>
3356 post 35
#include <string.h>
36
#include <fcntl.h>
3319 post 37
 
3311 post 38
#include "config.h"
39
#include "util.h"
40
#include "errors.h"
3277 post 41
#include "entry.h"
42
#include "cat.h"
43
#include "cmds.h"
44
 
45
static char *cmdname = "cat";
3356 post 46
#define CAT_VERSION "0.0.1"
47
#define CAT_DEFAULT_BUFLEN 1024
3277 post 48
 
3356 post 49
static char *cat_oops = "That option is not yet supported\n";
50
 
3375 post 51
static struct option const long_options[] = {
3356 post 52
    { "help", no_argument, 0, 'h' },
53
    { "version", no_argument, 0, 'v' },
54
    { "head", required_argument, 0, 'H' },
55
    { "tail", required_argument, 0, 't' },
56
    { "buffer", required_argument, 0, 'b' },
57
    { "more", no_argument, 0, 'm' },
3319 post 58
    { 0, 0, 0, 0 }
59
};
60
 
3277 post 61
/* Dispays help for cat in various levels */
4153 mejdrech 62
void help_cmd_cat(unsigned int level)
3277 post 63
{
3356 post 64
    if (level == HELP_SHORT) {
65
        printf("`%s' shows the contents of files\n", cmdname);
66
    } else {
67
        help_cmd_cat(HELP_SHORT);
68
        printf(
69
        "Usage:  %s [options] <file1> [file2] [...]\n"
70
        "Options:\n"
71
        "  -h, --help       A short option summary\n"
72
        "  -v, --version    Print version information and exit\n"
73
        "  -H, --head ##    Print only the first ## bytes\n"
74
        "  -t, --tail ##    Print only the last ## bytes\n"
75
        "  -b, --buffer ##  Set the read buffer size to ##\n"
76
        "  -m, --more       Pause after each screen full\n"
77
        "Currently, %s is under development, some options don't work.\n",
78
        cmdname, cmdname);
79
    }
80
 
4153 mejdrech 81
    return;
3277 post 82
}
83
 
3364 post 84
static unsigned int cat_file(const char *fname, size_t blen)
3356 post 85
{
86
    int fd, bytes = 0, count = 0, reads = 0;
87
    off_t total = 0;
88
    char *buff = NULL;
89
 
90
    if (-1 == (fd = open(fname, O_RDONLY))) {
91
        printf("Unable to open %s\n", fname);
92
        return 1;
93
    }
94
 
95
    total = lseek(fd, 0, SEEK_END);
96
    lseek(fd, 0, SEEK_SET);
3358 post 97
 
3356 post 98
    if (NULL == (buff = (char *) malloc(blen + 1))) {
99
        close(fd);
100
        printf("Unable to allocate enough memory to read %s\n",
101
            fname);
102
        return 1;
103
    }
104
 
105
    do {
106
        bytes = read(fd, buff, blen);
107
        if (bytes > 0) {
108
            count += bytes;
4153 mejdrech 109
            buff[bytes] = '\0';
110
            printf("%s", buff);
3356 post 111
            reads++;
112
        }
113
    } while (bytes > 0);
114
 
115
    close(fd);
116
    if (bytes == -1) {
117
        printf("Error reading %s\n", fname);
118
        free(buff);
119
        return 1;
120
    }
121
 
122
    free(buff);
123
 
124
    return 0;
125
}
126
 
3277 post 127
/* Main entry point for cat, accepts an array of arguments */
4153 mejdrech 128
int cmd_cat(char **argv)
3277 post 129
{
3356 post 130
    unsigned int argc, i, ret = 0, buffer = 0;
3319 post 131
    int c, opt_ind;
3277 post 132
 
3376 post 133
    argc = cli_count_args(argv);
3277 post 134
 
3319 post 135
    for (c = 0, optind = 0, opt_ind = 0; c != -1;) {
3356 post 136
        c = getopt_long(argc, argv, "hvmH:t:b:", long_options, &opt_ind);
3319 post 137
        switch (c) {
138
        case 'h':
3356 post 139
            help_cmd_cat(HELP_LONG);
140
            return CMD_SUCCESS;
3319 post 141
        case 'v':
3356 post 142
            printf("%s\n", CAT_VERSION);
143
            return CMD_SUCCESS;
144
        case 'H':
145
            printf(cat_oops);
146
            return CMD_FAILURE;
147
        case 't':
148
            printf(cat_oops);
149
            return CMD_FAILURE;
150
        case 'b':
151
            printf(cat_oops);
3319 post 152
            break;
3356 post 153
        case 'm':
154
            printf(cat_oops);
155
            return CMD_FAILURE;
3319 post 156
        }
157
    }
158
 
3356 post 159
    argc -= optind;
3319 post 160
 
3356 post 161
    if (argc < 1) {
162
        printf("%s - incorrect number of arguments. Try `%s --help'\n",
163
            cmdname, cmdname);
164
        return CMD_FAILURE;
165
    }
166
 
167
    if (buffer <= 0)
168
        buffer = CAT_DEFAULT_BUFLEN;
169
 
170
    for (i = optind; argv[i] != NULL; i++)
171
        ret += cat_file(argv[i], buffer);
172
 
173
    if (ret)
174
        return CMD_FAILURE;
175
    else
176
        return CMD_SUCCESS;
3277 post 177
}
178