Fixes a bug where calling yyless() to unput all the chars before a newline would not reset the beginning of line marker. Otherwise, flex won't match rules that start with a caret (^) after calling yyless() in thise case. AT&T lex behaves correctly.
Upstream PR: https://github.com/westes/flex/pull/452 - todd Index: usr.bin/lex/flex.skl =================================================================== RCS file: /cvs/src/usr.bin/lex/flex.skl,v retrieving revision 1.16 diff -u -p -u -r1.16 flex.skl --- usr.bin/lex/flex.skl 2 May 2017 19:16:19 -0000 1.16 +++ usr.bin/lex/flex.skl 4 Aug 2020 16:01:22 -0000 @@ -532,6 +532,9 @@ m4_ifdef( [[M4_YY_NOT_IN_HEADER]], YY_RESTORE_YY_MORE_OFFSET \ YY_G(yy_c_buf_p) = yy_cp = yy_bp + yyless_macro_arg - YY_MORE_ADJ; \ YY_DO_BEFORE_ACTION; /* set up yytext again */ \ + if ( yyleng > 0 ) \ + YY_CURRENT_BUFFER_LVALUE->yy_at_bol = \ + (yytext[yyleng - 1] == '\n'); \ } \ while ( 0 ) ]])
