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sfeed.c: parsetime improve parsing RFC2822 obsolete short year - sfeed - RSS and Atom parser |
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git clone git://git.codemadness.org/sfeed (git://git.codemadness.org) |
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--- |
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commit 92dfc055ce7a24bc8120c7eece3caca0ae84b653 |
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parent c7739b9c04b4b49888e1161164b1cdac0d9930ca |
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Author: Hiltjo Posthuma <hiltjo@codemadness.org> (mailto://) |
application/vnd.lotus-organizer |
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Date: Sun, 26 Mar 2023 18:40:31 +0200 |
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sfeed.c: parsetime improve parsing RFC2822 obsolete short year |
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https://datatracker.ietf.org/doc/html/rfc2822#section-4.3 |
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"Where a two or three digit year occurs in a date, the year is to be |
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interpreted as follows: If a two digit year is encountered whose |
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value is between 00 and 49, the year is interpreted by adding 2000, |
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ending up with a value between 2000 and 2049. If a two digit year is |
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encountered with a value between 50 and 99, or any three digit year |
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is encountered, the year is interpreted by adding 1900." |
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Improvement on commit 7086670e4335714e1df982bf1058082b7400b653 |
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For example (output from TZ=UTC sfeed_plain): |
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input: Sun, 26 Jul 049 19:26:34 |
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was: 2049-07-26 19:26 |
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now: 1949-07-26 19:26 (because this is a 3-digit year) |
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input: Sun, 26 Jul 1 19:26:34 |
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was: 2001-07-26 19:26 |
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now: 0001-07-26 19:26 (because this is a 1-digit year and doesn't match the short year rule) |
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input: Sun, 26 Jul 001 19:26:34 |
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was: 2001-07-26 19:26 |
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now: 1901-07-26 19:26 (because this is a 3 digit year) |
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These cases are all added to the tests in the sfeed_tests repo (times.xml file). |
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Diffstat: |
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M sfeed.c | 4 ++-- |
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1 file changed, 2 insertions(+), 2 deletions(-) |
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--- |
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diff --git a/sfeed.c b/sfeed.c |
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@@ -613,8 +613,8 @@ parsetime(const char *s, long long *tp) |
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for (v = 0, i = 0; i < 4 && ISDIGIT((unsigned char)*s); s++, i++) |
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v = (v * 10) + (*s - '0'); |
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/* obsolete short year: RFC2822 4.3 */ |
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- if (i <= 3) |
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- v += (v >= 0 && v <= 49) ? 2000 : 1900; |
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+ if (i == 2 || i == 3) |
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+ v += (i == 2 && v >= 0 && v <= 49) ? 2000 : 1900; |
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va[0] = v; /* year */ |
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for (; ISSPACE((unsigned char)*s); s++) |
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; |
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