29 lines
865 B
Diff
29 lines
865 B
Diff
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From 67b3e448727da3093cdc6f0ca7fd151fbf3c10ad Mon Sep 17 00:00:00 2001
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From: jannick0 <jannick0@users.noreply.github.com>
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Date: Sun, 7 Jan 2018 21:34:32 +0100
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Subject: [PATCH] scanner: fix default of yy_top_state()
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For an _empty_ state stack the top of the state stack defaults to the state as if no state stack were present.
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NB: sanity check for `yy_start_stack_ptr` could be added in `yy_top_state()`.
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---
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src/flex.skl | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/flex.skl b/src/flex.skl
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index 1043238..05729df 100644
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--- a/src/flex.skl
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+++ b/src/flex.skl
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@@ -2465,7 +2465,7 @@ m4_ifdef( [[M4_YY_NO_TOP_STATE]],,
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%endif
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{
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M4_YY_DECL_GUTS_VAR();
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- return YY_G(yy_start_stack)[YY_G(yy_start_stack_ptr) - 1];
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+ return yy_start_stack_ptr > 0 ? YY_G(yy_start_stack)[YY_G(yy_start_stack_ptr) - 1] : YY_START;
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}
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]])
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--
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1.8.3.1
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