bc: Force a unwind string in every function - sbase - suckless unix tools
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---
DIR commit c00921a3a3eabb3f908fc22eff9189c756274742
DIR parent 1c79098178db0f6c26bf4459902000b81c098dd0
HTML Author: Roberto E. Vargas Caballero <k0ga@shike2.net>
Date: Sun, 18 Jan 2026 11:26:26 +0100
bc: Force a unwind string in every function
The code in funcode() assumes that the string unwind has a
value but it didn't happen in the case of a function without
parameters or local variables.
Diffstat:
M bc.y | 4 ++--
A tests/0046-bc.sh | 19 +++++++++++++++++++
2 files changed, 21 insertions(+), 2 deletions(-)
---
DIR diff --git a/bc.y b/bc.y
@@ -356,6 +356,7 @@ macro(int op)
inhome = 1;
break;
case DEF:
+ unwind = estrdup("");
inhome = 0;
d->id = funid(yytext);
d->flowid = macros[0].flowid;
@@ -391,8 +392,7 @@ decl(int type, char *list, char *id)
i2 = estrdup(id);
free(id);
- if (!unwind)
- unwind = estrdup("");
+ unwind = estrdup("");
if (!list)
list = estrdup("");
DIR diff --git a/tests/0046-bc.sh b/tests/0046-bc.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+tmp=$$.tmp
+
+trap 'rm -f $tmp' EXIT
+trap 'exit $?' HUP INT TERM
+
+cat <<'EOF' > $tmp
+0
+0
+EOF
+
+$EXEC ../bc -p ../dc <<'EOF' | diff -u - $tmp
+define a() {
+0
+}
+
+a()
+EOF