/* $LynxId: LYmktime.c,v 1.9 2008/12/27 00:46:30 tom Exp $ */ #include #include #include #ifdef TEST_DRIVER char *LYstrncpy(char *dst, const char *src, int n) { char *val; int len; if (src == 0) src = ""; len = strlen(src); if (n < 0) n = 0; val = strncpy(dst, src, n); if (len < n) *(dst + len) = '\0'; else *(dst + n) = '\0'; return val; } #define strcasecomp strcasecmp BOOLEAN WWW_TraceFlag = FALSE; FILE *TraceFP(void) { return stderr; } #define USE_PARSDATE 0 #else #define USE_PARSDATE 1 #endif /* * This function takes a string in the format * "Mon, 01-Jan-96 13:45:35 GMT" or * "Mon, 1 Jan 1996 13:45:35 GMT" or * "dd-mm-yyyy" * as an argument, and returns its conversion to clock format (seconds since * 00:00:00 Jan 1 1970), or 0 if the string doesn't match the expected pattern. * It also returns 0 if the time is in the past and the "absolute" argument is * FALSE. It is intended for handling 'expires' strings in Version 0 cookies * homologously to 'max-age' strings in Version 1 cookies, for which 0 is the * minimum, and greater values are handled as '[max-age seconds] + time(NULL)'. * If "absolute" if TRUE, we return the clock format value itself, but if * anything goes wrong when parsing the expected patterns, we still return 0. * - FM */ time_t LYmktime(char *string, BOOL absolute) { #if USE_PARSDATE time_t result = 0; if (non_empty(string)) { CTRACE((tfp, "LYmktime: Parsing '%s'\n", string)); result = parsedate(string, 0); if (!absolute) { if ((time((time_t *) 0) - result) >= 0) result = 0; } if (result != 0) { CTRACE((tfp, "LYmktime: clock=%" PRI_time_t ", ctime=%s", CAST_time_t(result), ctime(&result))); } } return result; #else char *s; time_t now, clock2; int day, month, year, hour, minutes, seconds; char *start; char temp[8]; /* * Make sure we have a string to parse. - FM */ if (!non_empty(string)) return (0); s = string; CTRACE((tfp, "LYmktime: Parsing '%s'\n", s)); /* * Skip any lead alphabetic "Day, " field and seek a numeric day field. - * FM */ while (*s != '\0' && !isdigit(UCH(*s))) s++; if (*s == '\0') return (0); /* * Get the numeric day and convert to an integer. - FM */ start = s; while (*s != '\0' && isdigit(UCH(*s))) s++; if (*s == '\0' || (s - start) > 2) return (0); LYstrncpy(temp, start, (int) (s - start)); day = atoi(temp); if (day < 1 || day > 31) return (0); /* * Get the month string and convert to an integer. - FM */ while (*s != '\0' && !isalnum(UCH(*s))) s++; if (*s == '\0') return (0); start = s; while (*s != '\0' && isalnum(UCH(*s))) s++; if ((*s == '\0') || (s - start) < (isdigit(UCH(*(s - 1))) ? 2 : 3) || (s - start) > (isdigit(UCH(*(s - 1))) ? 2 : 9)) return (0); LYstrncpy(temp, start, (isdigit(UCH(*(s - 1))) ? 2 : 3)); switch (TOUPPER(temp[0])) { case '0': case '1': month = atoi(temp); if (month < 1 || month > 12) { return (0); } break; case 'A': if (!strcasecomp(temp, "Apr")) { month = 4; } else if (!strcasecomp(temp, "Aug")) { month = 8; } else { return (0); } break; case 'D': if (!strcasecomp(temp, "Dec")) { month = 12; } else { return (0); } break; case 'F': if (!strcasecomp(temp, "Feb")) { month = 2; } else { return (0); } break; case 'J': if (!strcasecomp(temp, "Jan")) { month = 1; } else if (!strcasecomp(temp, "Jun")) { month = 6; } else if (!strcasecomp(temp, "Jul")) { month = 7; } else { return (0); } break; case 'M': if (!strcasecomp(temp, "Mar")) { month = 3; } else if (!strcasecomp(temp, "May")) { month = 5; } else { return (0); } break; case 'N': if (!strcasecomp(temp, "Nov")) { month = 11; } else { return (0); } break; case 'O': if (!strcasecomp(temp, "Oct")) { month = 10; } else { return (0); } break; case 'S': if (!strcasecomp(temp, "Sep")) { month = 9; } else { return (0); } break; default: return (0); } /* * Get the numeric year string and convert to an integer. - FM */ while (*s != '\0' && !isdigit(UCH(*s))) s++; if (*s == '\0') return (0); start = s; while (*s != '\0' && isdigit(UCH(*s))) s++; if ((s - start) == 4) { LYstrncpy(temp, start, 4); } else if ((s - start) == 2) { now = time(NULL); /* * Assume that received 2-digit dates >= 70 are 19xx; others * are 20xx. Only matters when dealing with broken software * (HTTP server or web page) which is not Y2K compliant. The * line is drawn on a best-guess basis; it is impossible for * this to be completely accurate because it depends on what * the broken sender software intends. (This totally breaks * in 2100 -- setting up the next crisis...) - BL */ if (atoi(start) >= 70) LYstrncpy(temp, "19", 2); else LYstrncpy(temp, "20", 2); strncat(temp, start, 2); temp[4] = '\0'; } else { return (0); } year = atoi(temp); /* * Get the numeric hour string and convert to an integer. - FM */ while (*s != '\0' && !isdigit(UCH(*s))) s++; if (*s == '\0') { hour = 0; minutes = 0; seconds = 0; } else { start = s; while (*s != '\0' && isdigit(UCH(*s))) s++; if (*s != ':' || (s - start) > 2) return (0); LYstrncpy(temp, start, (int) (s - start)); hour = atoi(temp); /* * Get the numeric minutes string and convert to an integer. - FM */ while (*s != '\0' && !isdigit(UCH(*s))) s++; if (*s == '\0') return (0); start = s; while (*s != '\0' && isdigit(UCH(*s))) s++; if (*s != ':' || (s - start) > 2) return (0); LYstrncpy(temp, start, (int) (s - start)); minutes = atoi(temp); /* * Get the numeric seconds string and convert to an integer. - FM */ while (*s != '\0' && !isdigit(UCH(*s))) s++; if (*s == '\0') return (0); start = s; while (*s != '\0' && isdigit(UCH(*s))) s++; if (*s == '\0' || (s - start) > 2) return (0); LYstrncpy(temp, start, (int) (s - start)); seconds = atoi(temp); } /* * Convert to clock format (seconds since 00:00:00 Jan 1 1970), but then * zero it if it's in the past and "absolute" is not TRUE. - FM */ month -= 3; if (month < 0) { month += 12; year--; } day += (year - 1968) * 1461 / 4; day += ((((month * 153) + 2) / 5) - 672); clock2 = (time_t) ((day * 60 * 60 * 24) + (hour * 60 * 60) + (minutes * 60) + seconds); if (absolute == FALSE && (long) (time((time_t *) 0) - clock2) >= 0) clock2 = (time_t) 0; if (clock2 > 0) CTRACE((tfp, "LYmktime: clock=%" PRI_time_t ", ctime=%s", CAST_time_t(clock2), ctime(&clock2))); return (clock2); #endif } #ifdef TEST_DRIVER static void test_mktime(char *source) { time_t before = LYmktime(source, TRUE); time_t after = parsedate(source, 0); printf("TEST %s\n", source); printf("\t%" PRI_time_t " %s", CAST_time_t(before), ctime(&before)); printf("\t%" PRI_time_t " %s", CAST_time_t(after), ctime(&after)); if (before != after) printf("\t****\n"); } int main(void) { test_mktime("Mon, 01-Jan-96 13:45:35 GMT"); test_mktime("Mon, 1 Jan 1996 13:45:35 GMT"); test_mktime("31-12-1999"); test_mktime("Wed May 14 22:00:00 2008"); test_mktime("Sun, 29-Jun-2008 23:19:30 GMT"); test_mktime("Sun Jul 06 07:00:00 2008 GMT"); return 0; } #endif