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
|
/*
* Copyright (C) 2021 P. J. McDermott
*
* This file is part of @
*
* @ 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.
*
* @ 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 @. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "config.h"
#include "datetime.h"
#if defined(HAVE_GETOPT_LONG) && HAVE_GETOPT_LONG
#include <getopt.h>
#endif
extern const char *PACKAGE_VERSION_GIT;
#if defined(HAVE_GETOPT_LONG) && HAVE_GETOPT_LONG
struct option LONGOPTS_[] = {
{
.name = "help",
.has_arg = 0,
.flag = NULL,
.val = 'h',
},
{
.name = "version",
.has_arg = 0,
.flag = NULL,
.val = 'V',
},
};
#endif
static void
_print_usage(FILE *stream, const char *program_name)
{
fprintf(stream, "Usage: %s [date]time\n", program_name);
}
static void
_print_help(const char *program_name)
{
_print_usage(stdout, program_name);
puts("Options:");
#if defined(HAVE_GETOPT_LONG) && HAVE_GETOPT_LONG
puts("\t-h, --help Show this help information");
puts("\t-V, --version Show version information");
#else
puts("\t-h Show this help information");
puts("\t-V Show version information");
#endif
}
static void
_print_version(void)
{
printf("@ (atsign) %s%s\n", PACKAGE_VERSION, PACKAGE_VERSION_GIT);
puts("Copyright (C) 2021 P. J. McDermott");
puts("License GPLv3+: GNU GPL version 3 or later "
"<http://gnu.org/licenses/gpl.html>.");
puts("This is free software: you are free to change and redistribute "
"it.");
puts("There is NO WARRANTY, to the extent permitted by law.\n");
printf("Please report bugs to <%s>.\n", PACKAGE_BUGREPORT);
}
static char *
_concat_args(int argc, char * const argv[])
{
int buf_l;
int i;
char *buf;
int buf_i;
int j;
buf_l = 0;
for (i = 0; i < argc; ++i) {
buf_l += strlen(argv[i]) + 1;
}
buf = calloc(buf_l, sizeof(*buf));
if (buf == NULL) {
fprintf(stderr, "Failed to allocate buffer: %s\n",
strerror(errno));
return NULL;
}
buf_i = 0;
for (i = 0; i < argc; ++i) {
for (j = 0; argv[i][j] != '\0'; ++j) {
buf[buf_i++] = argv[i][j];
}
buf[buf_i++] = ' ';
}
buf[--buf_i] = '\0';
return buf;
}
int
main(int argc, char * const argv[])
{
int opt;
char *buf;
time_t arg;
time_t now;
time_t dif;
optind = 1;
opterr = 0;
#if defined(HAVE_GETOPT_LONG) && HAVE_GETOPT_LONG
while ((opt = getopt_long(argc, argv, "hV", LONGOPTS_, NULL)) > 0) {
#else
while ((opt = getopt(argc, argv, "hV")) > 0) {
#endif
switch (opt) {
case 'h':
_print_help(argv[0]);
return EXIT_SUCCESS;
case 'V':
_print_version();
return EXIT_SUCCESS;
default:
_print_usage(stderr, argv[0]);
#if defined(HAVE_GETOPT_LONG) && HAVE_GETOPT_LONG
fprintf(stderr, "Try '%s --help' for more "
"information.\n", argv[0]);
#else
fprintf(stderr, "Try '%s -h' for more "
"information.\n", argv[0]);
#endif
return EXIT_FAILURE;
}
}
argc -= optind;
argv += optind;
buf = _concat_args(argc, argv);
if (buf == NULL) {
return EXIT_FAILURE;
}
if (datetime_parse(buf, &arg) < 0) {
free(buf);
return EXIT_FAILURE;
}
free(buf);
time(&now);
dif = arg - now;
if (dif >= 1000 * 24 * 60 * 60) {
fputs("Date too far in the future\n", stderr);
return EXIT_FAILURE;
}
setvbuf(stdout, NULL, _IONBF, 0);
while (arg > now) {
printf("\r%03d:%02d:%02d:%02d",
(int) dif / 60 / 60 / 24,
(int) dif / 60 / 60 % 24,
(int) dif / 60 % 60,
(int) dif % 60);
sleep(1);
time(&now);
dif = arg - now;
}
printf("\r000:00:00:00\n");
return EXIT_SUCCESS;
}
|