1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (C) 1996
5 * David L. Nugent. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <ctype.h>
30 #include <err.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <xlocale.h>
34
35 #include "psdate.h"
36
37
38 int
numerics(char const * str)39 numerics(char const * str)
40 {
41
42 return (str[strspn(str, "0123456789x")] == '\0');
43 }
44
45 static int
aindex(char const * arr[],char const ** str,int len)46 aindex(char const * arr[], char const ** str, int len)
47 {
48 int l, i;
49 char mystr[32];
50
51 mystr[len] = '\0';
52 l = strlen(strncpy(mystr, *str, len));
53 for (i = 0; i < l; i++)
54 mystr[i] = (char) tolower((unsigned char)mystr[i]);
55 for (i = 0; arr[i] && strcmp(mystr, arr[i]) != 0; i++);
56 if (arr[i] == NULL)
57 i = -1;
58 else { /* Skip past it */
59 while (**str && isalpha((unsigned char)**str))
60 ++(*str);
61 /* And any following whitespace */
62 while (**str && (**str == ',' || isspace((unsigned char)**str)))
63 ++(*str);
64 } /* Return index */
65 return i;
66 }
67
68 static int
weekday(char const ** str)69 weekday(char const ** str)
70 {
71 static char const *days[] =
72 {"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL};
73
74 return aindex(days, str, 3);
75 }
76
77 static void
parse_datesub(char const * str,struct tm * t)78 parse_datesub(char const * str, struct tm *t)
79 {
80 struct tm tm;
81 locale_t l;
82 int i;
83 char *ret;
84 const char *valid_formats[] = {
85 "%d-%b-%y",
86 "%d-%b-%Y",
87 "%d-%m-%y",
88 "%d-%m-%Y",
89 "%H:%M %d-%b-%y",
90 "%H:%M %d-%b-%Y",
91 "%H:%M %d-%m-%y",
92 "%H:%M %d-%m-%Y",
93 "%H:%M:%S %d-%b-%y",
94 "%H:%M:%S %d-%b-%Y",
95 "%H:%M:%S %d-%m-%y",
96 "%H:%M:%S %d-%m-%Y",
97 "%d-%b-%y %H:%M",
98 "%d-%b-%Y %H:%M",
99 "%d-%m-%y %H:%M",
100 "%d-%m-%Y %H:%M",
101 "%d-%b-%y %H:%M:%S",
102 "%d-%b-%Y %H:%M:%S",
103 "%d-%m-%y %H:%M:%S",
104 "%d-%m-%Y %H:%M:%S",
105 "%H:%M\t%d-%b-%y",
106 "%H:%M\t%d-%b-%Y",
107 "%H:%M\t%d-%m-%y",
108 "%H:%M\t%d-%m-%Y",
109 "%H:%M\t%S %d-%b-%y",
110 "%H:%M\t%S %d-%b-%Y",
111 "%H:%M\t%S %d-%m-%y",
112 "%H:%M\t%S %d-%m-%Y",
113 "%d-%b-%y\t%H:%M",
114 "%d-%b-%Y\t%H:%M",
115 "%d-%m-%y\t%H:%M",
116 "%d-%m-%Y\t%H:%M",
117 "%d-%b-%y\t%H:%M:%S",
118 "%d-%b-%Y\t%H:%M:%S",
119 "%d-%m-%y\t%H:%M:%S",
120 "%d-%m-%Y\t%H:%M:%S",
121 NULL,
122 };
123
124 l = newlocale(LC_ALL_MASK, "C", NULL);
125
126 for (i=0; valid_formats[i] != NULL; i++) {
127 memset(&tm, 0, sizeof(tm));
128 ret = strptime_l(str, valid_formats[i], &tm, l);
129 if (ret && *ret == '\0') {
130 t->tm_mday = tm.tm_mday;
131 t->tm_mon = tm.tm_mon;
132 t->tm_year = tm.tm_year;
133 t->tm_hour = tm.tm_hour;
134 t->tm_min = tm.tm_min;
135 t->tm_sec = tm.tm_sec;
136 freelocale(l);
137 return;
138 }
139 }
140
141 freelocale(l);
142
143 errx(EXIT_FAILURE, "Invalid date");
144 }
145
146
147 /*-
148 * Parse time must be flexible, it handles the following formats:
149 * nnnnnnnnnnn UNIX timestamp (all numeric), 0 = now
150 * 0xnnnnnnnn UNIX timestamp in hexadecimal
151 * 0nnnnnnnnn UNIX timestamp in octal
152 * 0 Given time
153 * +nnnn[smhdwoy] Given time + nnnn hours, mins, days, weeks, months or years
154 * -nnnn[smhdwoy] Given time - nnnn hours, mins, days, weeks, months or years
155 * dd[ ./-]mmm[ ./-]yy Date }
156 * hh:mm:ss Time } May be combined
157 */
158
159 time_t
parse_date(time_t dt,char const * str)160 parse_date(time_t dt, char const * str)
161 {
162 char *p;
163 int i;
164 long val;
165 struct tm *T;
166
167 if (dt == 0)
168 dt = time(NULL);
169
170 while (*str && isspace((unsigned char)*str))
171 ++str;
172
173 if (numerics(str)) {
174 dt = strtol(str, &p, 0);
175 } else if (*str == '+' || *str == '-') {
176 val = strtol(str, &p, 0);
177 switch (*p) {
178 case 'h':
179 case 'H': /* hours */
180 dt += (val * 3600L);
181 break;
182 case '\0':
183 case 'm':
184 case 'M': /* minutes */
185 dt += (val * 60L);
186 break;
187 case 's':
188 case 'S': /* seconds */
189 dt += val;
190 break;
191 case 'd':
192 case 'D': /* days */
193 dt += (val * 86400L);
194 break;
195 case 'w':
196 case 'W': /* weeks */
197 dt += (val * 604800L);
198 break;
199 case 'o':
200 case 'O': /* months */
201 T = localtime(&dt);
202 T->tm_mon += (int) val;
203 i = T->tm_mday;
204 goto fixday;
205 case 'y':
206 case 'Y': /* years */
207 T = localtime(&dt);
208 T->tm_year += (int) val;
209 i = T->tm_mday;
210 fixday:
211 dt = mktime(T);
212 T = localtime(&dt);
213 if (T->tm_mday != i) {
214 T->tm_mday = 1;
215 dt = mktime(T);
216 dt -= (time_t) 86400L;
217 }
218 default: /* unknown */
219 break; /* leave untouched */
220 }
221 } else {
222 char *q, tmp[64];
223
224 /*
225 * Skip past any weekday prefix
226 */
227 weekday(&str);
228 strlcpy(tmp, str, sizeof(tmp));
229 str = tmp;
230 T = localtime(&dt);
231
232 /*
233 * See if we can break off any timezone
234 */
235 while ((q = strrchr(tmp, ' ')) != NULL) {
236 if (strchr("(+-", q[1]) != NULL)
237 *q = '\0';
238 else {
239 int j = 1;
240
241 while (q[j] && isupper((unsigned char)q[j]))
242 ++j;
243 if (q[j] == '\0')
244 *q = '\0';
245 else
246 break;
247 }
248 }
249
250 parse_datesub(tmp, T);
251 dt = mktime(T);
252 }
253 return dt;
254 }
255