The Annoyance Filter.pdf - Fourmilab

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226 DEVELOPMENT LOG ANNOYANCE-FILTER §256 Release 1.0b. 2003 October 8 Good ole’ gcc 3.3.1 has taken to complaining if you compare c ≤ 255 where c is an unsigned char. Well, of course, this cannot be false , but it makes perfect sense when used in an assertion within a macro which only writes out a single byte of its argument. But of course we must sacrifice sound engineering safeguards in the interest of the gcc thought police’s finely-honed sense of purity. So, out goes the assertion in dictionaryWord ::exportToBinaryFile which guards against any programmer accidentally using outCount to write a value which may be larger than 255. Suppose you want to initialise a character class or translation table. What could be more natural than to write, say, “ctab[’.’] = CC_PUNCT”? Well, not if you have to compile with gcc 3.3.1 which deems using a char as a subscript a distinctly unnatural act meriting a compile-time warning. I added a dumb macro to wrap static cast〈int〉( ) around the character table entries initialised in this way in base64MIMEdecoder ::initialiseDecodingTable , tokenDefinition ::setISO 8859defaults , and tokenDefinition ::setUS ASCIIdefaults . Ooooh, that’s soooooh much cleaner now! 2004 March 23 Added a kludge attempt to work around the messages which have begun to arrive with no blank line after the header, which runs directly into the first MIME header. At the moment, the code is just hammered into mailFolder ::nextLine conditionally compiled on SLOPPY_HEADERS. If it does the job, I will make it a proper option and add it to the documentation. 2004 March 30 When configured for a system with HAVE_MKSTEMP, PDF decoding left a file descriptor pointing to each temporary file it created open. The error was due to mkstemp’s returning a handle to the open file as well as the file name. The code in 〈 Transcribe PDF document to temporary file 127 〉 went ahead and opened the file on its own, as is done after obtaining a name from tmpnam . I modified the code to use the open file handle from mkstemp and ensure it’s closed when we’re done writing the file. Of course this puts us right on the tracks where the HAVE_FDSTREAM_COMPATIBILITY locomotive is bearing down on us, necessitating conditionals all around to handle the removal of file handle I/O from fstream in later GCC libraries. Release 1.0c. 2004 August 4 The latest twist of the knife by the GCC priesthood in G++ 3.4 struck the dataTable template class in statlib.w. The “enhancement” which torpedoed this code which previously compiled without warnings in −Wall mode is “described” by this fine piece of gibberish from the G++ documentation. After you’ve sorted through all the scholasticism, the bottom line is that any template class you define which is derived from an STL template such as vector and innocently uses methods from the parent class such as size , begin , or end , will now blow off with a compile error unless you qualify each of these method references with this ⃗ or vector〈T 〉::. How I regret ever getting involved with this crap-bag language and compiler! The latest version of the the macros for CWEB, cweb/cwebmac.tex fails with TEX 3.14159 (Web2C 7.3.1) because pdfURL is defined inside a block of code which is only processed by pdfTEX. I moved the definition down to the bottom of the file, and now everything seems to work OK. To eliminate the need to install cwebmac.tex in the TEX directory tree and avoid possible version incompatibilities, I added an environment variable set to the invocations of TEX and pdfTEX in Makefile.in to force the copy in our own cweb directory to be used.
§256 ANNOYANCE-FILTER DEVELOPMENT LOG 227 Rebuilt configure using Autoconf 2.59, which corrects the idiotic char function type in the AC_CHECK_FUNCS macro which was causing mkstemp and system not to be detected even on systems on which they are present. Promoted the SLOPPY_HEADERS code to a full-fledged option, −−sloppyheaders. By default, it is off. To enable parsing of MIME headers with missing blank separators, specify the option both when training and testing messages. Release 1.0d.
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§1 ANNOYANCE-FILTER INTRODUCTION 1
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§3 ANNOYANCE-FILTER GETTING STARTE
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§4 ANNOYANCE-FILTER OPTIONS 5 4. O
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§4 ANNOYANCE-FILTER OPTIONS 7 −
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