File: main.c

package info (click to toggle)
libexplain 1.4.D001-6
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 39,280 kB
  • ctags: 8,666
  • sloc: ansic: 156,026; makefile: 47,893; sh: 16,303; yacc: 1,894; awk: 245
file content (236 lines) | stat: -rw-r--r-- 6,106 bytes parent folder | download | duplicates (6)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
/*
 * libexplain - Explain errno values returned by libc functions
 * Copyright (C) 2008-2011 Peter Miller
 * Written by Peter Miller <pmiller@opensource.org.au>
 *
 * 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 3 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.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include <libexplain/ac/stdio.h>
#include <libexplain/ac/stdlib.h>
#include <libexplain/ac/string.h>
#include <libexplain/ac/getopt.h>

#include <libexplain/errno_info.h>
#include <libexplain/errno_info/print.h>
#include <libexplain/exit.h>
#include <libexplain/freopen.h>
#include <libexplain/iocontrol.h>
#include <libexplain/string_buffer.h>
#include <libexplain/version_print.h>
#include <libexplain/wrap_and_print.h>

#include <explain/syscall.h>


static void
usage(void)
{
    fprintf(stderr, "Usage: explain -e <errno> <function> [ <args> ... ]\n");
    fprintf(stderr, "       explain -m <message> <function> [ <args> ... ]\n");
    fprintf(stderr, "       explain -V\n");
    exit(EXIT_FAILURE);
}


#ifdef HAVE_GETOPT_LONG

static const struct option options[] =
{
    { "errno", 1, 0, 'e' },
    { "explain-exit-status", 0, 0, 'E' },
    { "message", 1, 0, 'm' },
    { "print-errno-info", 0, 0, 'P' },
    { "statistics", 0, 0, 's' },
    { "version", 0, 0, 'V' },
    { "check-ioctl-conflicts", 0, 0, 'Z' },
    { 0, 0, 0, 0 }
};

#endif


static int exit_status;


static int
figure_out_error(const char *text)
{
    long            n;
    char            *ep;
    const explain_errno_info_t *eip;
    explain_string_buffer_t sb;
    char            message[200];

    explain_string_buffer_init(&sb, message, sizeof(message));

    /* is it a number? */
    n = strtol(text, &ep, 0);
    if (ep != text && !*ep)
        return n;

    /* is it a symbol? */
    eip = explain_errno_info_by_name(text);
    if (eip)
        return eip->error_number;

    /* is it an exact text? */
    eip = explain_errno_info_by_text(text);
    if (eip)
        return eip->error_number;

    /* is it a fuzzy symbol? */
    eip = explain_errno_info_by_name_fuzzy(text);
    if (eip)
    {
        explain_string_buffer_puts(&sb, "the error ");
        explain_string_buffer_puts_quoted(&sb, text);
        explain_string_buffer_puts
        (
            &sb,
            " doesn't match any known symbol, closest is the "
        );
        explain_string_buffer_puts_quoted(&sb, eip->name);
        explain_string_buffer_puts(&sb, " symbol");
        explain_wrap_and_print(stderr, message);
        exit_status = EXIT_FAILURE;
        exit(EXIT_FAILURE);
        /* NOTREACHED */
        return eip->error_number;
    }

    /* is it a fuzzy text? */
    eip = explain_errno_info_by_text_fuzzy(text);
    if (eip)
    {
        explain_string_buffer_puts(&sb, "the error ");
        explain_string_buffer_puts_quoted(&sb, text);
        explain_string_buffer_puts
        (
            &sb,
            " doesn't match any known symbol, closest is the "
        );
        explain_string_buffer_puts_quoted
        (
            &sb,
            explain_internal_strerror(eip->error_number)
        );
        explain_string_buffer_puts(&sb, " message");
        explain_wrap_and_print(stderr, message);
        exit_status = EXIT_FAILURE;
        exit(EXIT_FAILURE);
        /* NOTREACHED */
        return eip->error_number;
    }

    explain_string_buffer_puts(&sb, "the error ");
    explain_string_buffer_puts_quoted(&sb, text);
    explain_string_buffer_puts
    (
        &sb,
        " doesn't look like a number, or an error symbol, or a "
        "strerror() string, aborting"
    );
    explain_wrap_and_print(stderr, message);
    exit(EXIT_FAILURE);
    /* NOTREACHED */
    return 0;
}


static void
print_statistics(void)
{
    int             syscall_total;
    int             ioctl_total;
    int             ioctl_active;

    syscall_statistics(&syscall_total);
    printf("Coverage includes %d system calls ", syscall_total);

    explain_iocontrol_statistics(&ioctl_total, &ioctl_active);
    printf("and %d ioctl requests.\n", ioctl_total);
    if (ioctl_active < ioctl_total)
        printf(".\\\" only %d ioctls relevant to this system\n", ioctl_active);
}


int
main(int argc, char **argv)
{
    func_t          func;
    int             err;

    exit_status = EXIT_SUCCESS;
    err = -1;
    for (;;)
    {
#ifdef HAVE_GETOPT_LONG
        int c = getopt_long(argc, argv, "Ee:o:PpsVZ", options, 0);
#else
        int c = getopt(argc, argv, "Ee:o:PpsVZ");
#endif
        if (c == EOF)
            break;
        switch (c)
        {
        case 'E':
            explain_exit_on_exit();
            break;

        case 'e':
            err = figure_out_error(optarg);
            break;

        case 'o':
            explain_freopen_or_die(optarg, "w", stdout);
            break;

        case 'p':
            explain_errno_info_print(0);
            return 0;

        case 'P':
            explain_errno_info_print(1);
            return 0;

        case 's':
            print_statistics();
            return 0;

        case 'V':
            explain_version_print();
            return 0;

        case 'Z':
            explain_iocontrol_check_conflicts();
            return 0;

        default:
            usage();
            /* NOTREACHED */
        }
    }
    if (err < 0)
    {
        fprintf(stderr, "please specify an error number (-e)\n");
        exit(EXIT_FAILURE);
    }
    if (optind >= argc)
        usage();
    func = find_function(argv[optind]);
    ++optind;
    func(err, argc - optind, argv + optind);
    return exit_status;
}