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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 19:37:08 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 19:37:08 +0000 |
commit | d710a65c8b50bc3d4d0920dc6e865296f42edd5e (patch) | |
tree | d3bf9843448af9398b55f49a50a194bbaacd724e /src/timegm.c | |
parent | Initial commit. (diff) | |
download | nghttp2-d710a65c8b50bc3d4d0920dc6e865296f42edd5e.tar.xz nghttp2-d710a65c8b50bc3d4d0920dc6e865296f42edd5e.zip |
Adding upstream version 1.59.0.upstream/1.59.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/timegm.c')
-rw-r--r-- | src/timegm.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/src/timegm.c b/src/timegm.c new file mode 100644 index 0000000..3a671b1 --- /dev/null +++ b/src/timegm.c @@ -0,0 +1,88 @@ +/* + * nghttp2 - HTTP/2 C Library + * + * Copyright (c) 2013 Tatsuhiro Tsujikawa + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ +#include "timegm.h" + +#include <inttypes.h> + +/* Counter the number of leap year in the range [0, y). The |y| is the + year, including century (e.g., 2012) */ +static int count_leap_year(int y) { + y -= 1; + return y / 4 - y / 100 + y / 400; +} + +/* Based on the algorithm of Python 2.7 calendar.timegm. */ +time_t nghttp2_timegm(struct tm *tm) { + int days; + int num_leap_year; + int64_t t; + if (tm->tm_mon > 11) { + return -1; + } + num_leap_year = count_leap_year(tm->tm_year + 1900) - count_leap_year(1970); + days = (tm->tm_year - 70) * 365 + num_leap_year + tm->tm_yday; + t = ((int64_t)days * 24 + tm->tm_hour) * 3600 + tm->tm_min * 60 + tm->tm_sec; + + if (sizeof(time_t) == 4) { + if (t < INT32_MIN || t > INT32_MAX) { + return -1; + } + } + + return (time_t)t; +} + +/* Returns nonzero if the |y| is the leap year. The |y| is the year, + including century (e.g., 2012) */ +static int is_leap_year(int y) { + return y % 4 == 0 && (y % 100 != 0 || y % 400 == 0); +} + +/* The number of days before ith month begins */ +static int daysum[] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334}; + +time_t nghttp2_timegm_without_yday(struct tm *tm) { + int days; + int num_leap_year; + int64_t t; + if (tm->tm_mon > 11) { + return -1; + } + num_leap_year = count_leap_year(tm->tm_year + 1900) - count_leap_year(1970); + days = (tm->tm_year - 70) * 365 + num_leap_year + daysum[tm->tm_mon] + + tm->tm_mday - 1; + if (tm->tm_mon >= 2 && is_leap_year(tm->tm_year + 1900)) { + ++days; + } + t = ((int64_t)days * 24 + tm->tm_hour) * 3600 + tm->tm_min * 60 + tm->tm_sec; + + if (sizeof(time_t) == 4) { + if (t < INT32_MIN || t > INT32_MAX) { + return -1; + } + } + + return (time_t)t; +} |