1 files changed, 76 insertions, 0 deletions
diff --git a/src/cmd/eqn/pile.c b/src/cmd/eqn/pile.c
new file mode 100644
index 00000000..a2d16239
--- /dev/null
+++ b/src/cmd/eqn/pile.c
@@ -0,0 +1,76 @@
+#include "e.h"
+#include "y.tab.h"
+
+void pile(int oct)
+{
+	int i, nlist, nlist2, mid;
+	double bi, h, b, gap, sb;
+	extern double Pilegap, Pilebase;
+	int type, p1, p2;
+
+	yyval = salloc();
+	type = lp[oct];
+	p1 = oct + 3;		/* first entry */
+	p2 = p1 + lp[oct+1];	/* 1 after last */
+	gap = lp[oct+2];
+	if (gap != DEFGAP)
+		gap = EM(gap/100.0, ps);
+	else if (type == COL)
+		gap = 0;
+	else
+		gap = EM(Pilegap, ps);	/* 0.4 m between LCOL, etc. */
+	nlist = p2 - p1;
+	nlist2 = (nlist+1)/2;
+	mid = p1 + nlist2 - 1;
+	h = 0;
+	for (i = p1; i < p2; i++)
+		h += eht[lp[i]];
+	eht[yyval] = h + (nlist-1)*gap;
+	b = 0;
+	for (i = p2-1; i > mid; i--)
+		b += eht[lp[i]] + gap;
+	ebase[yyval] = (nlist%2) ? b + ebase[lp[mid]]
+			: b - EM(Pilebase, ps) - gap;
+	if (dbg) {
+		printf(".\tS%d <- %d pile of:", yyval, type);
+		for (i = p1; i < p2; i++)
+			printf(" S%d", lp[i]);
+		printf("; h=%g b=%g\n", eht[yyval], ebase[yyval]);
+	}
+	nrwid(lp[p1], ps, lp[p1]);
+	printf(".nr %d \\n(%d\n", yyval, lp[p1]);
+	for (i = p1+1; i < p2; i++) {
+		nrwid(lp[i], ps, lp[i]);
+		printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", 
+			lp[i], yyval, yyval, lp[i]);
+	}
+	printf(".ds %d \\v'%gm'\\h'%du*\\n(%du'\\\n", yyval, REL(ebase[yyval],ps), 
+		type==RCOL ? 1 : 0, yyval);
+	sb = 0;		/* sum of box hts */
+	for (i = p2-1; i >= p1; i--) {
+		bi = sb + ebase[lp[i]];
+		switch (type) {
+		case LCOL:
+			printf("\\v'%gm'\\*(%d\\h'-\\n(%du'\\v'%gm'\\\n", 
+				REL(-bi,ps), lp[i], lp[i], REL(bi,ps));
+			break;
+		case RCOL:
+			printf("\\v'%gm'\\h'-\\n(%du'\\*(%d\\v'%gm'\\\n", 
+				REL(-bi,ps), lp[i], lp[i], REL(bi,ps));
+			break;
+		case CCOL:
+		case COL:
+			printf("\\v'%gm'\\h'\\n(%du-\\n(%du/2u'\\*(%d", 
+				REL(-bi,ps), yyval, lp[i], lp[i]);
+			printf("\\h'-\\n(%du-\\n(%du/2u'\\v'%gm'\\\n", 
+				yyval, lp[i], REL(bi,ps));
+			break;
+		}
+		sb += eht[lp[i]] + gap;
+	}
+	printf("\\v'%gm'\\h'%du*\\n(%du'\n", REL(-ebase[yyval],ps), 
+		type!=RCOL ? 1 : 0, yyval);
+	for (i = p1; i < p2; i++)
+		sfree(lp[i]);
+	lfont[yyval] = rfont[yyval] = 0;
+}