Commit Graph

13 Commits

Author SHA1 Message Date
Jung-uk Kim
6b7e592c21 lex: Do not let input() return 0 when end-of-file is reached
Importing flex 2.6.4 has introduced a regression: input() now returns 0
instead of EOF to indicate that the end of input was reached, just like
traditional AT&T and POSIX lex.  Note the behavior contradicts flex(1).
See "INCOMPATIBILITIES WITH LEX AND POSIX" section for information.
This incompatibility traces back to the original version and documented
in its manual page by the Vern Paxson.

Apparently, it has been reported in a few places, e.g.,

https://github.com/westes/flex/issues/448
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=911415

Unfortunately, this also breaks the scanner used by libdtrace and
dtrace is unable to resolve some probe argument types as a result.  See
PR253440 for more information.

Note the regression was introduced by the following upstream commit
without any explanation or documentation change:

f863c9490e

Now we restore the traditional flex behavior unless lex-compatibility
mode is set with "-l" option because I believe the author originally
wanted to make it more lex and POSIX compatible.

PR:		253440
Reported by:	markj
2021-02-17 02:22:47 -05:00
Jung-uk Kim
34e67bb597 lex: Use NULL instead of 0 for pointers
Note araujo tried to fix it in r298241 but he only touched generated
files for bootstrap.  This commit properly fixes the problem.
2021-02-11 18:31:53 -05:00
Adrian Chadd
85c9048573 [flex] Fix compilation issue under mips-gcc-6.4
This was triggering a pointer-losing-constness error.
2020-07-14 05:00:08 +00:00
Jung-uk Kim
b7cadce49a Remove the unnecessary configure.ac. 2020-06-18 18:16:13 +00:00
Jung-uk Kim
7e38239042 MFV: r362286
Merge flex 2.6.4.
2020-06-18 18:09:16 +00:00
Brooks Davis
7138c819c4 Terminate filter_create_ext() args with NULL, not 0.
filter_create_ext() is documented to take a NULL terminated set of
arguments.  0 is promoted to an int so this would fail on 64-bit
systems if the value was not passed in a register.  On all currently
supported 64-bit architectures it is.

Obtained from:	CheriBSD
Sponsored by:	DARPA, AFRL
2018-08-08 22:45:30 +00:00
Jung-uk Kim
aec5199f85 Enable GNU m4 compatibility mode. 2013-05-21 19:23:49 +00:00
Jung-uk Kim
a994b2242d Allow YY_NO_UNPUT to disable unput() for backward compatibility. 2013-05-21 19:22:42 +00:00
Jung-uk Kim
5ad5113ebd Define yy_current_buffer for backward compatibility. 2013-05-21 19:21:26 +00:00
Jung-uk Kim
fd3b3c3ae6 Do not use log10(3) to get rid of libm dependency. It is really not useful. 2013-05-21 19:20:03 +00:00
Jung-uk Kim
8acd331814 Reduce compiler warnings. 2013-05-21 19:17:02 +00:00
Jung-uk Kim
e1fc19713a Apply still relevant local changes.
r124183:	Work around a `label defined but not used' warning.
r179549:	De-register declarations.
r179657:	De-register declarations in non-dot-c files.
r181269:	Mark yy_fatal_error() as __dead2.
r228992:	Spelling fixes.
r240518:	Correct double "the the".
2013-05-21 19:11:11 +00:00
Jung-uk Kim
3e102307b7 Add flex 2.5.37 from flex.sourceforge.net to contrib. 2013-05-21 19:09:30 +00:00