sbase

commit 41883950c9421cdb8fac18f5dd3dab8f7e2463e5
parent 2544b70216bb71aec663a9657142e13ad0c6ac41
Author: Roberto E. Vargas Caballero <k0ga@shike2.net>
Date:   Sat, 17 Jan 2026 18:09:57 +0100

bc: Add -p to change the dc executable

This option is mainly added to make easier testing and enabling
using bc with custom dc versions.

Diffstat:
M
bc.1
 | 
9
++++++++-
M
bc.y
 | 
9
+++++++--
M
tests/0010-bc.sh
 | 
2
+-

3 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/bc.1 b/bc.1
@@ -1,4 +1,4 @@
-.Dd December 31, 2025
+.Dd December 17, 2026
 .Dt BC 1
 .Os sbase
 .Sh NAME
@@ -6,6 +6,7 @@
 .Nd arbitrary-precision arithmetic language
 .Sh SYNOPSIS
 .Nm
+.Op Fl p Ar dc
 .Op Fl cdls
 .Op Ar file ...
 .Sh DESCRIPTION
@@ -23,6 +24,12 @@ After all the files are loaded and executed then
 it reads from stdin.
 .Sh OPTIONS
 .Bl -tag -width Ds
+.It Fl p Ar dc
+Dc program spawned to run the translated code generated by
+.Ar bc .
+By default,
+it is
+.Ar dc .
 .It Fl c
 Compile only mode.
 Generate dc code without spawning a dc subprocess.
diff --git a/bc.y b/bc.y
@@ -59,6 +59,8 @@ static int nested, inhome;
 static Macro macros[NESTED_MAX];
 int cflag, dflag, lflag, sflag;
 
+static char *dcprog = "dc";
+
 %}
 
 %union {
@@ -803,7 +805,7 @@ spawn(void)
 		dup(fds[0]);
 		close(fds[0]);
 		close(fds[1]);
-		execlp("dc", "dc", (char *) NULL);
+		execlp(dcprog, "dc", (char *) NULL);
 
 		/* it shouldn't happen */
 		write(3, errmsg, sizeof(errmsg)-1);
@@ -848,13 +850,16 @@ bc(char *fname)
 static void
 usage(void)
 {
-	eprintf("usage: %s [-cdls]\n", argv0);
+	eprintf("usage: %s [-p dc][-cdls]\n", argv0);
 }
 
 int
 main(int argc, char *argv[])
 {
 	ARGBEGIN {
+	case 'p':
+		dcprog = EARGF(usage);
+		break;
 	case 'c':
 		cflag = 1;
 		break;
diff --git a/tests/0010-bc.sh b/tests/0010-bc.sh
@@ -21,7 +21,7 @@ cat <<EOF >$tmp
 .48609126058589107690
 EOF
 
-$EXEC ../bc ../bc.library <<EOF | diff -u $tmp -
+$EXEC ../bc -p ../dc ../bc.library <<EOF | diff -u $tmp -
 a(0)
 a(1)
 a(2)