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| author | jannick0 <jannick0@users.noreply.github.com> | 2018-01-07 21:34:32 +0100 |
|---|---|---|
| committer | Will Estes <westes575@gmail.com> | 2018-03-13 10:45:16 -0400 |
| commit | 67b3e448727da3093cdc6f0ca7fd151fbf3c10ad (patch) | |
| tree | 3b313351dfa014815d1900e52b1e32ad1cc031f0 | |
| parent | 6a6e69af761801aedeab0264246772cf60810246 (diff) | |
| download | flex-git-67b3e448727da3093cdc6f0ca7fd151fbf3c10ad.tar.gz | |
scanner: fix default of yy_top_state()
For an _empty_ state stack the top of the state stack defaults to the state as if no state stack were present.
NB: sanity check for `yy_start_stack_ptr` could be added in `yy_top_state()`.
| -rw-r--r-- | src/flex.skl | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/flex.skl b/src/flex.skl index 1043238..05729df 100644 --- a/src/flex.skl +++ b/src/flex.skl @@ -2465,7 +2465,7 @@ m4_ifdef( [[M4_YY_NO_TOP_STATE]],, %endif { M4_YY_DECL_GUTS_VAR(); - return YY_G(yy_start_stack)[YY_G(yy_start_stack_ptr) - 1]; + return yy_start_stack_ptr > 0 ? YY_G(yy_start_stack)[YY_G(yy_start_stack_ptr) - 1] : YY_START; } ]]) |