--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netdiff/match/rdpass.c	Mon Sep 07 04:57:37 2020 +0000
@@ -0,0 +1,123 @@
+#include <ctype.h>
+#include <string.h>
+#include <strings.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "struct.h"
+
+extern char *infnames[2];
+extern struct pin_info *database;
+
+#define	MAX_FIELDS	2
+
+static int pass;
+static FILE *inf;
+static char linebuf[512];
+static int lineno;
+static char *fields[MAX_FIELDS];
+static unsigned nfields;
+
+static void
+parse_into_fields()
+{
+	char *cp;
+
+	nfields = 0;
+	for (cp = linebuf; ; ) {
+		while (isspace(*cp))
+			cp++;
+		if (*cp == '\0' || *cp == '#')
+			break;
+		if (nfields >= MAX_FIELDS) {
+			fprintf(stderr, "%s line %d: too many fields\n",
+				infnames[pass], lineno);
+			exit(1);
+		}
+		fields[nfields++] = cp;
+		while (*cp && !isspace(*cp))
+			cp++;
+		if (*cp)
+			*cp++ = '\0';
+	}
+}
+
+static void
+existing_pin(p, netname)
+	struct pin_info *p;
+	char *netname;
+{
+	char *dp;
+
+	if (p->netnames[pass]) {
+		fprintf(stderr, "%s line %d: multiple nets to pin %s\n",
+			infnames[pass], lineno, p->pin_name);
+		exit(1);
+	}
+	dp = malloc(strlen(netname) + 1);
+	if (!dp) {
+		perror("malloc");
+		exit(1);
+	}
+	strcpy(dp, netname);
+	p->netnames[pass] = dp;
+}
+
+static void
+process_connect(netname, pinname)
+	char *netname, *pinname;
+{
+	struct pin_info *p, **pp;
+	char *dp;
+
+	for (pp = &database; p = *pp; pp = &p->next) {
+		if (!strcmp(p->pin_name, pinname)) {
+			existing_pin(p, netname);
+			return;
+		}
+	}
+	p = malloc(sizeof(struct pin_info) + strlen(netname) + strlen(pinname)
+			+ 2);
+	if (!p) {
+		perror("malloc");
+		exit(1);
+	}
+	bzero(p, sizeof(struct pin_info));
+	dp = (char *)(p + 1);
+	p->pin_name = dp;
+	strcpy(dp, pinname);
+	dp += strlen(pinname) + 1;
+	p->netnames[pass] = dp;
+	strcpy(dp, netname);
+	*pp = p;
+}
+
+static void
+process_line()
+{
+	parse_into_fields();
+	if (!nfields)
+		return;
+	if (nfields != 2) {
+		fprintf(stderr, "%s line %d: expected 2 fields\n",
+			infnames[pass], lineno);
+		exit(1);
+	}
+	process_connect(fields[0], fields[1]);
+}
+
+read_pass(pass_no)
+{
+	pass = pass_no;
+	inf = fopen(infnames[pass], "r");
+	if (!inf) {
+		perror(infnames[pass]);
+		exit(1);
+	}
+	lineno = 0;
+	while (fgets(linebuf, sizeof linebuf, inf)) {
+		lineno++;
+		process_line();
+	}
+	fclose(inf);
+	return 0;
+}