filters: rewrite wrap in c

This utility introduced in commit c9524d265793 ("filters: add wrap
utility written in go") allows to reflow text to view emails that have
very long lines without breaking quotes, lists and indentation.

For such a simple task, go produces a binary that is 2.0M bytes on disk.
After stripping debugging symbols, it can be reduced to 1.2M bytes. All
of this for 267 lines of source code. This is a bit ridiculous, provided
people may load this binary into memory multiple times per minute. This
tool is a small side-project that seems not suitable for golang.

Rewrite it in C. It now only depends on a POSIX libc to run. It is safe
to assume that there is one available on all *NIX systems in the world
of 2023. The resulting binary is now 27K bytes (15K after stripping).

To build it, a C compiler and libc headers are required. These should
most likely be available since they are dependencies of the go compiler
toolchain.

I have tested compilation (with clang-analyzer and gcc -fanalyzer) and
basic operation on FreeBSD, Fedora (glibc) and Alpine (musl libc). More
tests would probably be required on MacOSX and older Linux distros.
I also added test vectors to give some confidence that this works as
expected.

Update CI with aggressive gcc hardening flags and to run these tests
with valgrind --leak-check=full.

Command line options are unchanged:

  usage: wrap [-h] [-w INT] [-r] [-l INT] [-f FILE]

  Wrap text without messing up email quotes.

  options:
    -h       show this help message
    -w INT   preferred wrap margin (default 80)
    -r       reflow all paragraphs even if no trailing space
    -l INT   minimum percentage of letters in a line to be considered
             a paragaph
    -f FILE  read from filename (default stdin)

Signed-off-by: Robin Jarry <robin@jarry.cc>
Tested-by: Bence Ferdinandy <bence@ferdinandy.com>
Tested-by: Maxwell G <gotmax@e.email>

1 files changed, 94 insertions, 0 deletions

diff --git a/filters/vectors/wrap-flowed.expected b/filters/vectors/wrap-flowed.expected
new file mode 100644
index 00000000..358b8109
--- /dev/null
+++ b/filters/vectors/wrap-flowed.expected
@@ -0,0 +1,94 @@
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+imperdiet ad, ad tritani deleniti duo? Vis id dicit inermis accumsan, ut
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+epicurei vim id. Posse consul philosophia vis cu, ea brute delectus eum!
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+animal, fugit scripserit ne eos. Ius delicata referrentur at? Vim id vidit
+feugiat comprehensam? At error expetendis vel, vim habeo perfecto complectitur
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+
+> > Mei malis choro dolores ne, eu erat vocibus denique has? Sed ea ullum
+> > deleniti, nam tritani aliquando complectitur ea! Mea no facer tempor
+> > alienum, fugit laoreet gloriatur eos cu. Ne mollis ceteros eum, eos an
+> > quodsi corpora. Modo ferri porro eu vis, putent dictas eloquentiam eos id.
+> > Ei eum odio possim definiebas, eum noster doctus ea. Exerci nemore
+> > gloriatur et vim! In torquatos sadipscing ius, ius ut debet dicant
+> > senserit. Eu mel omnes ubique, et consul hendrerit constituam mea, et has
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+> > intellegam quo an. Zril nonumes officiis te sed, pri harum luptatum
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+> > ei, cum tale natum illud in! Has ei ponderum posidonium, mundi feugiat
+> > ponderum at usu, ut vim dictas principes.
+> > 
+> 
+> Tantas fuisset adversarium eos ei, quas dolorum albucius sea ne. Mea eu
+> pertinax consequat, eu mei nostrud facilisis, ut denique sadipscing sed? Eu
+> fugit elitr pericula per, nemore disputando his et. Ei stet putent
+> instructior eam, id civibus similique vim, est suas postea audire te! Error
+> cetero et sed. Eu quis animal pertinax mei, an nec omittam hendrerit? Ut
+> melius utroque laboramus qui?
+
+Lorem ipsum dolor sit amet, no choro invidunt mel, an blandit eligendi
+maluisset eam. Ne eam splendide omittantur. Eu vix ferri appareat sententiae,
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+
+-  Ea insolens quaerendum mea. An pro viris quidam liberavisse, lorem facer
+   erroribus ad mel. At sea graece concludaturque, duo in impedit accumsan
+   consequat. Cu pri dolorum vituperata, et vis aliquando complectitur, elitr
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+   constituto. Et quo scripta aliquam gloriatur. At audiam dolorem ius, malis
+   omnes sensibus sit ut, eum quod euripidis ad. At nec verear senserit,
+   diceret honestatis et vel, quis conceptam et nec. Eam probo option ea.
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+-  Ius summo dolore te, in quo choro tritani atomorum? Esse putant nec te?
+   Consul iuvaret debitis vix ei. Sit dicta quando legere no, quas novum
+   adolescens at his, cu est mutat equidem. Ea mea tation bonorum, mel
+   complectitur deterruisset id. Vim ut dicunt tamquam, et his illud invenire.
+
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+   qui, vix no reque dolores necessitatibus, id fugit libris facilisis sit! Ne
+   ocurreret honestatis nam. Ex reque maluisset per, eam facer ludus dicam ad.
+   Eam modus impedit intellegat ei! Per no libris utamur nostrum, cu sed mollis
+   accusamus.
+
+-  Nam at nibh meis singulis, augue aliquando liberavisse eos ea. Audire
+   facilis perpetua mel ea. Vel te oportere indoctum volutpat, omittam eligendi
+   patrioque per an. Nec ut eirmod appetere deterruisset, dico insolens no pri,
+   solum liber vituperata at sit? Sea id ipsum fugit viris.
+
+
+
+-  Sea bonorum instructior consectetuer in. Eum ex impedit volutpat. Pro an
+   stet definiebas necessitatibus. Aperiam facilis his et! Ei vim labitur
+   petentium, illum contentiones duo in? Id sed sale scriptorem. Sed et tollit
+   albucius?
+