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In C, signed integer overflow is undefined behavior. Thus, the compiler is allowed to assume that it will not occur. In the check for an overflow, the developer assumes that the signed integer of type time_t will wrap around if it overflows. However, this behavior is undefined in the C standard. Thus, when the compiler sees this, it simplifies t + delta < t to delta < 0. Since delta > 0 and delta < 0 can't both be true, the entire if statement is optimized out under certain optimization levels. Thus, the parsedate function would return PARSEDATE_OK with an undefined value in the time, instead of return -1 = PARSEDATE_FAIL.
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README
Curl is a command line tool for transferring data specified with URL
syntax. Find out how to use curl by reading the curl.1 man page or the
MANUAL document. Find out how to install Curl by reading the INSTALL
document.
libcurl is the library curl is using to do its job. It is readily
available to be used by your software. Read the libcurl.3 man page to
learn how!
You find answers to the most frequent questions we get in the FAQ document.
Study the COPYING file for distribution terms and similar. If you distribute
curl binaries or other binaries that involve libcurl, you might enjoy the
LICENSE-MIXING document.
CONTACT
If you have problems, questions, ideas or suggestions, please contact us
by posting to a suitable mailing list. See http://curl.haxx.se/mail/
All contributors to the project are listed in the THANKS document.
WEB SITE
Visit the curl web site for the latest news and downloads:
http://curl.haxx.se/
GIT
To download the very latest source off the GIT server do this:
git clone git://github.com/bagder/curl.git
(you'll get a directory named curl created, filled with the source code)
NOTICE
Curl contains pieces of source code that is Copyright (c) 1998, 1999
Kungliga Tekniska Högskolan. This notice is included here to comply with the
distribution terms.