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 * $Id$ 27 */ 28 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <ctype.h> 33 34 #include "psdate.h" 35 36 37 static int 38 a2i(char const ** str) 39 { 40 int i = 0; 41 char const *s = *str; 42 43 if (isdigit(*s)) { 44 i = atoi(s); 45 while (isdigit(*s)) 46 ++s; 47 *str = s; 48 } 49 return i; 50 } 51 52 static int 53 numerics(char const * str) 54 { 55 int rc = isdigit(*str); 56 57 if (rc) 58 while (isdigit(*str) || *str == 'x') 59 ++str; 60 return rc && !*str; 61 } 62 63 static int 64 aindex(char const * arr[], char const ** str, int len) 65 { 66 int l, i; 67 char mystr[32]; 68 69 mystr[len] = '\0'; 70 l = strlen(strncpy(mystr, *str, len)); 71 for (i = 0; i < l; i++) 72 mystr[i] = (char) tolower(mystr[i]); 73 for (i = 0; arr[i] && strcmp(mystr, arr[i]) != 0; i++); 74 if (arr[i] == NULL) 75 i = -1; 76 else { /* Skip past it */ 77 while (**str && isalpha(**str)) 78 ++(*str); 79 /* And any following whitespace */ 80 while (**str && (**str == ',' || isspace(**str))) 81 ++(*str); 82 } /* Return index */ 83 return i; 84 } 85 86 static int 87 weekday(char const ** str) 88 { 89 static char const *days[] = 90 {"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL}; 91 92 return aindex(days, str, 3); 93 } 94 95 static int 96 month(char const ** str) 97 { 98 static char const *months[] = 99 {"jan", "feb", "mar", "apr", "may", "jun", "jul", 100 "aug", "sep", "oct", "nov", "dec", NULL}; 101 102 return aindex(months, str, 3); 103 } 104 105 static void 106 parse_time(char const * str, int *hour, int *min, int *sec) 107 { 108 *hour = a2i(&str); 109 if ((str = strchr(str, ':')) == NULL) 110 *min = *sec = 0; 111 else { 112 ++str; 113 *min = a2i(&str); 114 *sec = ((str = strchr(str, ':')) == NULL) ? 0 : atoi(++str); 115 } 116 } 117 118 119 static void 120 parse_datesub(char const * str, int *day, int *mon, int *year) 121 { 122 int i; 123 124 static char const nchrs[] = "0123456789 \t,/-."; 125 126 if ((i = month(&str)) != -1) { 127 *mon = i; 128 if ((i = a2i(&str)) != 0) 129 *day = i; 130 } else if ((i = a2i(&str)) != 0) { 131 *day = i; 132 while (*str && strchr(nchrs + 10, *str) != NULL) 133 ++str; 134 if ((i = month(&str)) != -1) 135 *mon = i; 136 else if ((i = a2i(&str)) != 0) 137 *mon = i - 1; 138 } else 139 return; 140 141 while (*str && strchr(nchrs + 10, *str) != NULL) 142 ++str; 143 if (isdigit(*str)) { 144 *year = atoi(str); 145 if (*year > 1900) 146 *year -= 1900; 147 else if (*year < 32) 148 *year += 100; 149 } 150 } 151 152 153 /*- 154 * Parse time must be flexible, it handles the following formats: 155 * nnnnnnnnnnn UNIX timestamp (all numeric), 0 = now 156 * 0xnnnnnnnn UNIX timestamp in hexadecimal 157 * 0nnnnnnnnn UNIX timestamp in octal 158 * 0 Given time 159 * +nnnn[smhdwoy] Given time + nnnn hours, mins, days, weeks, months or years 160 * -nnnn[smhdwoy] Given time - nnnn hours, mins, days, weeks, months or years 161 * dd[ ./-]mmm[ ./-]yy Date } 162 * hh:mm:ss Time } May be combined 163 */ 164 165 time_t 166 parse_date(time_t dt, char const * str) 167 { 168 char *p; 169 int i; 170 long val; 171 struct tm *T; 172 173 if (dt == 0) 174 dt = time(NULL); 175 176 while (*str && isspace(*str)) 177 ++str; 178 179 if (numerics(str)) { 180 val = strtol(str, &p, 0); 181 dt = val ? val : dt; 182 } else if (*str == '+' || *str == '-') { 183 val = strtol(str, &p, 0); 184 switch (*p) { 185 case 'h': 186 case 'H': /* hours */ 187 dt += (val * 3600L); 188 break; 189 case '\0': 190 case 'm': 191 case 'M': /* minutes */ 192 dt += (val * 60L); 193 break; 194 case 's': 195 case 'S': /* seconds */ 196 dt += val; 197 break; 198 case 'd': 199 case 'D': /* days */ 200 dt += (val * 86400L); 201 break; 202 case 'w': 203 case 'W': /* weeks */ 204 dt += (val * 604800L); 205 break; 206 case 'o': 207 case 'O': /* months */ 208 T = localtime(&dt); 209 T->tm_mon += (int) val; 210 i = T->tm_mday; 211 goto fixday; 212 case 'y': 213 case 'Y': /* years */ 214 T = localtime(&dt); 215 T->tm_year += (int) val; 216 i = T->tm_mday; 217 fixday: 218 dt = mktime(T); 219 T = localtime(&dt); 220 if (T->tm_mday != i) { 221 T->tm_mday = 1; 222 dt = mktime(T); 223 dt -= (time_t) 86400L; 224 } 225 default: /* unknown */ 226 break; /* leave untouched */ 227 } 228 } else { 229 char *q, tmp[64]; 230 231 /* 232 * Skip past any weekday prefix 233 */ 234 weekday(&str); 235 str = strncpy(tmp, str, sizeof tmp - 1); 236 tmp[sizeof tmp - 1] = '\0'; 237 T = localtime(&dt); 238 239 /* 240 * See if we can break off any timezone 241 */ 242 while ((q = strrchr(tmp, ' ')) != NULL) { 243 if (strchr("(+-", q[1]) != NULL) 244 *q = '\0'; 245 else { 246 int j = 1; 247 248 while (q[j] && isupper(q[j])) 249 ++j; 250 if (q[j] == '\0') 251 *q = '\0'; 252 else 253 break; 254 } 255 } 256 257 /* 258 * See if there is a time hh:mm[:ss] 259 */ 260 if ((p = strchr(tmp, ':')) == NULL) { 261 262 /* 263 * No time string involved 264 */ 265 T->tm_hour = T->tm_min = T->tm_sec = 0; 266 parse_datesub(tmp, &T->tm_mday, &T->tm_mon, &T->tm_year); 267 } else { 268 char datestr[64], timestr[64]; 269 270 /* 271 * Let's chip off the time string 272 */ 273 if ((q = strpbrk(p, " \t")) != NULL) { /* Time first? */ 274 int l = q - str; 275 276 strncpy(timestr, str, l); 277 timestr[l] = '\0'; 278 strncpy(datestr, q + 1, sizeof datestr); 279 datestr[sizeof datestr - 1] = '\0'; 280 parse_time(timestr, &T->tm_hour, &T->tm_min, &T->tm_sec); 281 parse_datesub(datestr, &T->tm_mday, &T->tm_mon, &T->tm_year); 282 } else if ((q = strrchr(tmp, ' ')) != NULL) { /* Time last */ 283 int l = q - tmp; 284 285 strncpy(timestr, q + 1, sizeof timestr); 286 timestr[sizeof timestr - 1] = '\0'; 287 strncpy(datestr, tmp, l); 288 datestr[l] = '\0'; 289 } else /* Bail out */ 290 return dt; 291 parse_time(timestr, &T->tm_hour, &T->tm_min, &T->tm_sec); 292 parse_datesub(datestr, &T->tm_mday, &T->tm_mon, &T->tm_year); 293 } 294 dt = mktime(T); 295 } 296 return dt; 297 } 298