diff options
Diffstat (limited to 'lib/parsedate.c')
| -rw-r--r-- | lib/parsedate.c | 100 |
1 files changed, 56 insertions, 44 deletions
diff --git a/lib/parsedate.c b/lib/parsedate.c index 0fabbd26..aa27303f 100644 --- a/lib/parsedate.c +++ b/lib/parsedate.c @@ -5,7 +5,7 @@ * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * - * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al. + * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms @@ -276,26 +276,23 @@ struct my_tm { int tm_hour; int tm_mday; int tm_mon; - int tm_year; + int tm_year; /* full year */ }; /* struct tm to time since epoch in GMT time zone. * This is similar to the standard mktime function but for GMT only, and * doesn't suffer from the various bugs and portability problems that * some systems' implementations have. + * + * Returns 0 on success, otherwise non-zero. */ -static time_t my_timegm(struct my_tm *tm) +static void my_timegm(struct my_tm *tm, time_t *t) { static const int month_days_cumulative [12] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 }; int month, year, leap_days; - if(tm->tm_year < 70) - /* we don't support years before 1970 as they will cause this function - to return a negative value */ - return -1; - - year = tm->tm_year + 1900; + year = tm->tm_year; month = tm->tm_mon; if(month < 0) { year += (11 - month) / 12; @@ -310,9 +307,9 @@ static time_t my_timegm(struct my_tm *tm) leap_days = ((leap_days / 4) - (leap_days / 100) + (leap_days / 400) - (1969 / 4) + (1969 / 100) - (1969 / 400)); - return ((((time_t) (year - 1970) * 365 - + leap_days + month_days_cumulative [month] + tm->tm_mday - 1) * 24 - + tm->tm_hour) * 60 + tm->tm_min) * 60 + tm->tm_sec; + *t = ((((time_t) (year - 1970) * 365 + + leap_days + month_days_cumulative[month] + tm->tm_mday - 1) * 24 + + tm->tm_hour) * 60 + tm->tm_min) * 60 + tm->tm_sec; } /* @@ -436,7 +433,7 @@ static int parsedate(const char *date, time_t *output) tzoff = (val/100 * 60 + val%100)*60; /* the + and - prefix indicates the local time compared to GMT, - this we need ther reversed math to get what we want */ + this we need their reversed math to get what we want */ tzoff = date[-1]=='+'?-tzoff:tzoff; } @@ -462,7 +459,7 @@ static int parsedate(const char *date, time_t *output) if(!found && (dignext == DATE_YEAR) && (yearnum == -1)) { yearnum = val; found = TRUE; - if(yearnum < 1900) { + if(yearnum < 100) { if(yearnum > 70) yearnum += 1900; else @@ -491,18 +488,39 @@ static int parsedate(const char *date, time_t *output) /* lacks vital info, fail */ return PARSEDATE_FAIL; -#if SIZEOF_TIME_T < 5 - /* 32 bit time_t can only hold dates to the beginning of 2038 */ - if(yearnum > 2037) { - *output = 0x7fffffff; - return PARSEDATE_LATER; +#ifdef HAVE_TIME_T_UNSIGNED + if(yearnum < 1970) { + /* only positive numbers cannot return earlier */ + *output = TIME_T_MIN; + return PARSEDATE_SOONER; } #endif - if(yearnum < 1970) { - *output = 0; +#if (SIZEOF_TIME_T < 5) + +#ifdef HAVE_TIME_T_UNSIGNED + /* an unsigned 32 bit time_t can only hold dates to 2106 */ + if(yearnum > 2105) { + *output = TIME_T_MAX; + return PARSEDATE_LATER; + } +#else + /* a signed 32 bit time_t can only hold dates to the beginning of 2038 */ + if(yearnum > 2037) { + *output = TIME_T_MAX; + return PARSEDATE_LATER; + } + if(yearnum < 1903) { + *output = TIME_T_MIN; return PARSEDATE_SOONER; } +#endif + +#else + /* The Gregorian calendar was introduced 1582 */ + if(yearnum < 1583) + return PARSEDATE_FAIL; +#endif if((mdaynum > 31) || (monnum > 11) || (hournum > 23) || (minnum > 59) || (secnum > 60)) @@ -513,31 +531,25 @@ static int parsedate(const char *date, time_t *output) tm.tm_hour = hournum; tm.tm_mday = mdaynum; tm.tm_mon = monnum; - tm.tm_year = yearnum - 1900; - - /* my_timegm() returns a time_t. time_t is often 32 bits, even on many - architectures that feature 64 bit 'long'. + tm.tm_year = yearnum; - Some systems have 64 bit time_t and deal with years beyond 2038. However, - even on some of the systems with 64 bit time_t mktime() returns -1 for - dates beyond 03:14:07 UTC, January 19, 2038. (Such as AIX 5100-06) + /* my_timegm() returns a time_t. time_t is often 32 bits, sometimes even on + architectures that feature 64 bit 'long' but ultimately time_t is the + correct data type to use. */ - t = my_timegm(&tm); - - /* time zone adjust (cast t to int to compare to negative one) */ - if(-1 != (int)t) { + my_timegm(&tm, &t); - /* Add the time zone diff between local time zone and GMT. */ - long delta = (long)(tzoff!=-1?tzoff:0); + /* Add the time zone diff between local time zone and GMT. */ + if(tzoff == -1) + tzoff = 0; - if((delta>0) && (t > LONG_MAX - delta)) { - *output = 0x7fffffff; - return PARSEDATE_LATER; /* time_t overflow */ - } - - t += delta; + if((tzoff > 0) && (t > TIME_T_MAX - tzoff)) { + *output = TIME_T_MAX; + return PARSEDATE_LATER; /* time_t overflow */ } + t += tzoff; + *output = t; return PARSEDATE_OK; @@ -549,10 +561,10 @@ time_t curl_getdate(const char *p, const time_t *now) int rc = parsedate(p, &parsed); (void)now; /* legacy argument from the past that we ignore */ - switch(rc) { - case PARSEDATE_OK: - case PARSEDATE_LATER: - case PARSEDATE_SOONER: + if(rc == PARSEDATE_OK) { + if(parsed == -1) + /* avoid returning -1 for a working scenario */ + parsed++; return parsed; } /* everything else is fail */ |