1 /*- 2 * Copyright (C) 1996 3 * David L. Nugent. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #ifndef lint 28 static const char rcsid[] = 29 "$FreeBSD: src/usr.sbin/pw/psdate.c,v 1.6.2.1 2000/06/28 19:19:04 ache Exp $"; 30 #endif /* not lint */ 31 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <ctype.h> 36 37 #include "psdate.h" 38 39 40 static int 41 a2i(char const ** str) 42 { 43 int i = 0; 44 char const *s = *str; 45 46 if (isdigit((unsigned char)*s)) { 47 i = atoi(s); 48 while (isdigit((unsigned char)*s)) 49 ++s; 50 *str = s; 51 } 52 return i; 53 } 54 55 static int 56 numerics(char const * str) 57 { 58 int rc = isdigit((unsigned char)*str); 59 60 if (rc) 61 while (isdigit((unsigned char)*str) || *str == 'x') 62 ++str; 63 return rc && !*str; 64 } 65 66 static int 67 aindex(char const * arr[], char const ** str, int len) 68 { 69 int l, i; 70 char mystr[32]; 71 72 mystr[len] = '\0'; 73 l = strlen(strncpy(mystr, *str, len)); 74 for (i = 0; i < l; i++) 75 mystr[i] = (char) tolower((unsigned char)mystr[i]); 76 for (i = 0; arr[i] && strcmp(mystr, arr[i]) != 0; i++); 77 if (arr[i] == NULL) 78 i = -1; 79 else { /* Skip past it */ 80 while (**str && isalpha((unsigned char)**str)) 81 ++(*str); 82 /* And any following whitespace */ 83 while (**str && (**str == ',' || isspace((unsigned char)**str))) 84 ++(*str); 85 } /* Return index */ 86 return i; 87 } 88 89 static int 90 weekday(char const ** str) 91 { 92 static char const *days[] = 93 {"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL}; 94 95 return aindex(days, str, 3); 96 } 97 98 static int 99 month(char const ** str) 100 { 101 static char const *months[] = 102 {"jan", "feb", "mar", "apr", "may", "jun", "jul", 103 "aug", "sep", "oct", "nov", "dec", NULL}; 104 105 return aindex(months, str, 3); 106 } 107 108 static void 109 parse_time(char const * str, int *hour, int *min, int *sec) 110 { 111 *hour = a2i(&str); 112 if ((str = strchr(str, ':')) == NULL) 113 *min = *sec = 0; 114 else { 115 ++str; 116 *min = a2i(&str); 117 *sec = ((str = strchr(str, ':')) == NULL) ? 0 : atoi(++str); 118 } 119 } 120 121 122 static void 123 parse_datesub(char const * str, int *day, int *mon, int *year) 124 { 125 int i; 126 127 static char const nchrs[] = "0123456789 \t,/-."; 128 129 if ((i = month(&str)) != -1) { 130 *mon = i; 131 if ((i = a2i(&str)) != 0) 132 *day = i; 133 } else if ((i = a2i(&str)) != 0) { 134 *day = i; 135 while (*str && strchr(nchrs + 10, *str) != NULL) 136 ++str; 137 if ((i = month(&str)) != -1) 138 *mon = i; 139 else if ((i = a2i(&str)) != 0) 140 *mon = i - 1; 141 } else 142 return; 143 144 while (*str && strchr(nchrs + 10, *str) != NULL) 145 ++str; 146 if (isdigit((unsigned char)*str)) { 147 *year = atoi(str); 148 if (*year > 1900) 149 *year -= 1900; 150 else if (*year < 32) 151 *year += 100; 152 } 153 } 154 155 156 /*- 157 * Parse time must be flexible, it handles the following formats: 158 * nnnnnnnnnnn UNIX timestamp (all numeric), 0 = now 159 * 0xnnnnnnnn UNIX timestamp in hexadecimal 160 * 0nnnnnnnnn UNIX timestamp in octal 161 * 0 Given time 162 * +nnnn[smhdwoy] Given time + nnnn hours, mins, days, weeks, months or years 163 * -nnnn[smhdwoy] Given time - nnnn hours, mins, days, weeks, months or years 164 * dd[ ./-]mmm[ ./-]yy Date } 165 * hh:mm:ss Time } May be combined 166 */ 167 168 time_t 169 parse_date(time_t dt, char const * str) 170 { 171 char *p; 172 int i; 173 long val; 174 struct tm *T; 175 176 if (dt == 0) 177 dt = time(NULL); 178 179 while (*str && isspace((unsigned char)*str)) 180 ++str; 181 182 if (numerics(str)) { 183 dt = strtol(str, &p, 0); 184 } else if (*str == '+' || *str == '-') { 185 val = strtol(str, &p, 0); 186 switch (*p) { 187 case 'h': 188 case 'H': /* hours */ 189 dt += (val * 3600L); 190 break; 191 case '\0': 192 case 'm': 193 case 'M': /* minutes */ 194 dt += (val * 60L); 195 break; 196 case 's': 197 case 'S': /* seconds */ 198 dt += val; 199 break; 200 case 'd': 201 case 'D': /* days */ 202 dt += (val * 86400L); 203 break; 204 case 'w': 205 case 'W': /* weeks */ 206 dt += (val * 604800L); 207 break; 208 case 'o': 209 case 'O': /* months */ 210 T = localtime(&dt); 211 T->tm_mon += (int) val; 212 i = T->tm_mday; 213 goto fixday; 214 case 'y': 215 case 'Y': /* years */ 216 T = localtime(&dt); 217 T->tm_year += (int) val; 218 i = T->tm_mday; 219 fixday: 220 dt = mktime(T); 221 T = localtime(&dt); 222 if (T->tm_mday != i) { 223 T->tm_mday = 1; 224 dt = mktime(T); 225 dt -= (time_t) 86400L; 226 } 227 default: /* unknown */ 228 break; /* leave untouched */ 229 } 230 } else { 231 char *q, tmp[64]; 232 233 /* 234 * Skip past any weekday prefix 235 */ 236 weekday(&str); 237 str = strncpy(tmp, str, sizeof tmp - 1); 238 tmp[sizeof tmp - 1] = '\0'; 239 T = localtime(&dt); 240 241 /* 242 * See if we can break off any timezone 243 */ 244 while ((q = strrchr(tmp, ' ')) != NULL) { 245 if (strchr("(+-", q[1]) != NULL) 246 *q = '\0'; 247 else { 248 int j = 1; 249 250 while (q[j] && isupper((unsigned char)q[j])) 251 ++j; 252 if (q[j] == '\0') 253 *q = '\0'; 254 else 255 break; 256 } 257 } 258 259 /* 260 * See if there is a time hh:mm[:ss] 261 */ 262 if ((p = strchr(tmp, ':')) == NULL) { 263 264 /* 265 * No time string involved 266 */ 267 T->tm_hour = T->tm_min = T->tm_sec = 0; 268 parse_datesub(tmp, &T->tm_mday, &T->tm_mon, &T->tm_year); 269 } else { 270 char datestr[64], timestr[64]; 271 272 /* 273 * Let's chip off the time string 274 */ 275 if ((q = strpbrk(p, " \t")) != NULL) { /* Time first? */ 276 int l = q - str; 277 278 strncpy(timestr, str, l); 279 timestr[l] = '\0'; 280 strncpy(datestr, q + 1, sizeof datestr); 281 datestr[sizeof datestr - 1] = '\0'; 282 parse_time(timestr, &T->tm_hour, &T->tm_min, &T->tm_sec); 283 parse_datesub(datestr, &T->tm_mday, &T->tm_mon, &T->tm_year); 284 } else if ((q = strrchr(tmp, ' ')) != NULL) { /* Time last */ 285 int l = q - tmp; 286 287 strncpy(timestr, q + 1, sizeof timestr); 288 timestr[sizeof timestr - 1] = '\0'; 289 strncpy(datestr, tmp, l); 290 datestr[l] = '\0'; 291 } else /* Bail out */ 292 return dt; 293 parse_time(timestr, &T->tm_hour, &T->tm_min, &T->tm_sec); 294 parse_datesub(datestr, &T->tm_mday, &T->tm_mon, &T->tm_year); 295 } 296 dt = mktime(T); 297 } 298 return dt; 299 } 300