date.c
资源名称:gateway-1.2.1 [点击查看]
上传用户:gzpyjq
上传日期:2013-01-31
资源大小:1852k
文件大小:5k
源码类别:
手机WAP编程
开发平台:
WINDOWS
- /* date.c - utility functions for handling times and dates
- *
- * Richard Braakman
- */
- #include <unistd.h>
- #include <ctype.h>
- #include <string.h>
- #include "gwlib.h"
- static unsigned char *wkday[7] = {
- "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
- };
- static unsigned char *monthname[12] = {
- "Jan", "Feb", "Mar", "Apr", "May", "Jun",
- "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
- };
- /* The starting day of each month, if there's not a leap year.
- * January 1 is day 0, December 31 is day 355. */
- static int monthstart[12] = {
- 0, 31, 59, 90, 120, 151,
- 181, 212, 243, 273, 304, 334
- };
- /* Value in seconds */
- #define MINUTE 60
- #define HOUR (60 * MINUTE)
- #define DAY (24 * HOUR)
- Octstr *date_format_http(unsigned long unixtime)
- {
- struct tm tm;
- unsigned char buffer[30];
- tm = gw_gmtime((time_t) unixtime);
- /* Make sure gmtime gave us a good date. We check this to
- * protect the sprintf call below, which might overflow its
- * buffer if the field values are bad. */
- if (tm.tm_wday < 0 || tm.tm_wday > 6 ||
- tm.tm_mday < 0 || tm.tm_mday > 31 ||
- tm.tm_mon < 0 || tm.tm_mon > 11 ||
- tm.tm_year < 0 ||
- tm.tm_hour < 0 || tm.tm_hour > 23 ||
- tm.tm_min < 0 || tm.tm_min > 59 ||
- tm.tm_sec < 0 || tm.tm_sec > 61) {
- warning(0, "Bad date for timestamp %lu, cannot format.",
- unixtime);
- return NULL;
- }
- sprintf(buffer, "%s, %02d %s %04d %02d:%02d:%02d GMT",
- wkday[tm.tm_wday], tm.tm_mday, monthname[tm.tm_mon],
- tm.tm_year + 1900, tm.tm_hour, tm.tm_min, tm.tm_sec);
- return octstr_create(buffer);
- }
- long date_convert_universal(struct universaltime *t)
- {
- long date;
- int leapyears;
- long year;
- date = (t->year - 1970) * (365 * DAY);
- /* If we haven't had this year's leap day yet, pretend it's
- * the previous year. */
- year = t->year;
- if (t->month <= 1)
- year--;
- /* Add leap years since 1970. The magic number 477 is the value
- * this formula would give for 1970 itself. Notice the extra
- * effort we make to keep it correct for the year 2100. */
- leapyears = (year / 4) - (year / 100) + (year / 400) - 477;
- date += leapyears * DAY;
- date += monthstart[t->month] * DAY;
- date += (t->day - 1) * DAY;
- date += t->hour * HOUR;
- date += t->minute * MINUTE;
- date += t->second;
- return date;
- }
- long date_parse_http(Octstr *date)
- {
- long pos;
- struct universaltime t;
- Octstr *monthstr = NULL;
- /* First, skip the leading day-of-week string. */
- pos = octstr_search_char(date, ' ', 0);
- if (pos < 0 || pos == octstr_len(date) - 1)
- return -1;
- pos++; /* Skip the space */
- /* Distinguish between the three acceptable formats */
- if (isdigit(octstr_get_char(date, pos)) &&
- octstr_get_char(date, pos + 2) == ' ') {
- if (octstr_len(date) - pos < (long)strlen("06 Nov 1994 08:49:37 GMT"))
- goto error;
- if (octstr_parse_long(&t.day, date, pos, 10) != pos + 2)
- goto error;
- monthstr = octstr_copy(date, pos + 3, 3);
- if (octstr_parse_long(&t.year, date, pos + 7, 10) != pos + 11)
- goto error;
- if (octstr_parse_long(&t.hour, date, pos + 12, 10) != pos + 14)
- goto error;
- if (octstr_parse_long(&t.minute, date, pos + 15, 10) != pos + 17)
- goto error;
- if (octstr_parse_long(&t.second, date, pos + 18, 10) != pos + 20)
- goto error;
- /* Take the GMT part on faith. */
- } else if (isdigit(octstr_get_char(date, pos)) &&
- octstr_get_char(date, pos + 2) == '-') {
- if (octstr_len(date) - pos < (long)strlen("06-Nov-94 08:49:37 GMT"))
- goto error;
- if (octstr_parse_long(&t.day, date, pos, 10) != pos + 2)
- goto error;
- monthstr = octstr_copy(date, pos + 3, 3);
- if (octstr_parse_long(&t.year, date, pos + 7, 10) != pos + 9)
- goto error;
- if (t.year > 60)
- t.year += 1900;
- else
- t.year += 2000;
- if (octstr_parse_long(&t.hour, date, pos + 10, 10) != pos + 12)
- goto error;
- if (octstr_parse_long(&t.minute, date, pos + 13, 10) != pos + 15)
- goto error;
- if (octstr_parse_long(&t.second, date, pos + 16, 10) != pos + 18)
- goto error;
- /* Take the GMT part on faith. */
- } else {
- if (octstr_len(date) - pos < (long)strlen(" 6 08:49:37 1994"))
- goto error;
- monthstr = octstr_copy(date, pos, 3);
- if (octstr_parse_long(&t.day, date, pos + 4, 10) != pos + 6)
- goto error;
- if (octstr_parse_long(&t.hour, date, pos + 7, 10) != pos + 9)
- goto error;
- if (octstr_parse_long(&t.minute, date, pos + 10, 10) != pos + 12)
- goto error;
- if (octstr_parse_long(&t.second, date, pos + 13, 10) != pos + 15)
- goto error;
- if (octstr_parse_long(&t.year, date, pos + 16, 10) != pos + 20)
- goto error;
- }
- for (t.month = 0; t.month < 12; t.month++) {
- if (octstr_str_compare(monthstr, monthname[t.month]) == 0)
- break;
- }
- if (t.month == 12)
- goto error;
- octstr_destroy(monthstr);
- return date_convert_universal(&t);
- error:
- octstr_destroy(monthstr);
- return -1;
- }
- /* Note that this implementation makes unportable assumptions about time_t. */
- long date_universal_now(void)
- {
- return (long) time(NULL);
- }