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* doc/autoconf.texi: Mention that if (i in a) doesn't work with traditional Awk.

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Paul Eggert 2006-11-21 20:54:35 +00:00
parent 1dff385e02
commit d352fa108d
2 changed files with 11 additions and 7 deletions
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@ -4,6 +4,7 @@
that traditional Awk lacks 3-arg "split". It has it.
Mention that FS must be a single character, and a few other
99-byte limits of traditional Awk.
Mention that if (i in a) doesn't work with traditional Awk.
2006-11-18 Paul Eggert <eggert@cs.ucla.edu>

17
doc/autoconf.texi
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@ -13046,23 +13046,26 @@ Traditional Awk supports only the predefined functions @code{exp},
Traditional Awk @code{getline} is not at all compatible with Posix;
avoid it.
In traditional Awk, @code{FS} must be a string containing just one
ordinary character, and similarly for the field-separator argument to
@code{split}.
Traditional Awk has @code{for (i in a) @dots{}} but no other uses of the
@code{in} keyword. For example, it lacks @code{if (i in a) @dots{}}.
In code portable to both traditional and modern Awk, @code{FS} must be a
string containing just one ordinary character, and similarly for the
field-separator argument to @code{split}.
Traditional Awk has a limit of 99
fields in a record. You may be able to circumvent this problem by using
@code{split}.
Traditional Awk has a limit of at most 99 bytes in a number formatted by
@code{OFMT}; for example, @code{OFMT="%.300e"; print 0.1;} typically
dumps core.
The original version of Awk had a limit of at most 99 bytes per
@code{split} field, 99 bytes per @code{substr} substring, and 99 bytes
per run of non-special characters in a @code{printf} format, but these
bugs have been fixed on all practical hosts that we know of.
Traditional Awk has a limit of at most 99 bytes in a number formatted by
@code{OFMT}; for example, @code{OFMT="%.300e"; print 0.1;} will dump
core.
@item @command{basename}
@c ---------------------
@prindex @command{basename}