82 lines
3.5 KiB
Text
82 lines
3.5 KiB
Text
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small-sed
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by Eric S. Raymond, <esr@snark.thyrsus.com>
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and Rene Rebe <rene@exactcode.de>
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This is a smaller, cheaper, and faster SED utility. Minix uses it. GNU used
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to use it, until they built their own sed around an extended (some would
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say over-extended) regexp package and it is used for embedded tasks (for
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example by the T2 SDE - http://www.t2-project.org).
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The original sed 1.0 was written in three pieces; sed.h, sedcomp.c, sedexec.c.
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Some Minix hacker ran them together into a single-file version, mnsed.c which
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is not supported and shipped these days; if changes are needed for Minix please
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send a patch to the normal source.
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The 1.2 version (9 Oct 1996) add mnsed's support for detecting
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truncated hold spaces. The mnsed version is missing one feature in
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of the 1.2 version; support of +. Also, the multiple-file I/O is
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organized slightly differently.
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The 1.3 version added a bug fix by Tom Oehser, and the `L' command. Also
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this program is now distributed under GPL.
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The 1.5 version incooperated a lot of bug fixes by Rene Rebe as well as
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a real test suite. Also the function declaration and definition have been
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converted from the K&R C to ANSI C.
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The 1.6 version includes support for the n'th match for the substitude command
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as well as support for predefined character classes and only writes lines
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with newline if one was present in the input line (compatible with GNU sed).
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The 1.7 version fixed a segmentation fault with empty regular expressions,
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not to leak other buffer content for groups of commands and escaping
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numerical seperators in regular expressions by disabling obscure code.
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Additionally compilation with older compilers as well as warnings with the
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latest gcc versions have been corrected.
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The 1.8 version fixes matching of some escaped characters (a regression
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introduced with \+ star matching), \+ star matching to corretly copy
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and mark the internal bytecode representation, back references inside lhs
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regular expressions matching (to work at all) and marking the correct
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regular expression for star matches.
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The 1.9 version included a microoptimization shaving some bytes off the
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binary and some cpu cycles at run time, reusing the previous regular
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expressions for empty ones, predefined character classes with control
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characters, handling of escaped ampesands and support for backreference
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\0 and Kleene star operator on groups.
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The 1.10 version fixed a special case of grouped star matching where
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\+1..n overwrote the last match, not to infinite loop on certain zero match
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grouped star cases and not to crash on w(rite to file). The version also
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no longer falls into the conservative end-of-file matching mode when just
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end-of-line matching was used.
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The 1.11 version again fixed w(rite to file) handling to correctly honor
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/dev/stdout and /dev/stderr as GNU sed does and thus keep the streams in
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sync. Some unused variables have been removed and a two diagnostics
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fixed to be printed correctly.
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The 1.12 version fixed the l(ist) command to actually work, some tiny
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optimizations have been performed as well as some more compiler warnings
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fixed.
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Makefile -- how to build sed
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sed.h -- declarations and structures
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sedcomp.c -- sed pattern compilation
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sedexec.c -- sed program execution
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sed.1 -- source for the man page
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tests/ -- a small set of sed tests
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For some releases the man page in the man format.
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Surf to
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http://www.exactcode.de/oss/minised/
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http://www.catb.org/~esr/
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for updates of this software. There is a sed FAQ kept at these
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locations:
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http://www.dreamwvr.com/sed-info/sed-faq.html
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