1 files changed, 48 insertions, 0 deletions
diff --git a/unix/boot/spp/rpp/rpprat/caslab.r b/unix/boot/spp/rpp/rpprat/caslab.r
new file mode 100644
index 00000000..12d3c0da
--- /dev/null
+++ b/unix/boot/spp/rpp/rpprat/caslab.r
@@ -0,0 +1,48 @@
+include  defs
+
+# caslab - get one case label
+
+integer function caslab (n, t)
+
+integer n, t
+character tok(MAXTOK)
+integer i, s, lev
+integer gnbtok, ctoi
+
+	t = gnbtok (tok, MAXTOK)
+	while (t == NEWLINE)
+	    t = gnbtok (tok, MAXTOK)
+
+	if (t == EOF)
+	    return (t)
+
+	for (lev=0;  t == LPAREN;  t = gnbtok (tok, MAXTOK))
+	    lev = lev + 1
+
+	if (t == MINUS)
+	    s = -1
+	else
+	    s = +1
+	if (t == MINUS | t == PLUS)
+	    t = gnbtok (tok, MAXTOK)
+
+	if (t != DIGIT)
+	    goto 99
+	else {
+	    i = 1
+	    n = s * ctoi (tok, i)
+	}
+
+	for (t=gnbtok(tok,MAXTOK);  t == RPAREN;  t=gnbtok(tok,MAXTOK))
+	    lev = lev - 1
+	if (lev != 0)
+	    goto 99
+
+	while (t == NEWLINE)
+	    t = gnbtok (tok, MAXTOK)
+
+	return
+
+ 99	call synerr ("Invalid case label.")
+	n = 0
+end