--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/miscutil/protel-parts-condense.c	Sun Sep 20 02:40:23 2020 +0000
@@ -0,0 +1,202 @@
+/*
+ * This program reads a Protel netlist (exported from Altium), extracts
+ * the component list portion and emits it in a condensed form.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+
+static char *infname;
+static FILE *inf;
+static char linebuf[80], savebuf[6][80];
+static int lineno;
+
+static
+get_line()
+{
+	char *cp;
+
+	if (!fgets(linebuf, sizeof linebuf, inf))
+		return(0);
+	lineno++;
+	cp = index(linebuf, '\n');
+	if (!cp) {
+		fprintf(stderr, "%s line %d: missing newline\n",
+			infname, lineno);
+		exit(1);
+	}
+	*cp = '\0';
+	if (cp > linebuf && cp[-1] == '\r')
+		*--cp = '\0';
+	return(1);
+}
+
+static void
+get_line_notfirst()
+{
+	if (!get_line()) {
+		fprintf(stderr, "error: unexpected EOF in input\n");
+		exit(1);
+	}
+	if (!strcmp(linebuf, "[")) {
+		fprintf(stderr, "%s line %d: [ NOT expected\n",
+			infname, lineno);
+		exit(1);
+	}
+	if (!strcmp(linebuf, "(")) {
+		fprintf(stderr, "%s line %d: ( NOT expected\n",
+			infname, lineno);
+		exit(1);
+	}
+}
+
+static void
+check_line_for_nonprint_chars()
+{
+	char *cp;
+	int c;
+
+	for (cp = linebuf; *cp; cp++) {
+		c = *cp;
+		if ((c < ' ' || c > '~') && c != '\t') {
+			fprintf(stderr, "%s line %d: non-printable char\n",
+				infname, lineno);
+			exit(1);
+		}
+	}
+}
+
+static int
+item_needs_quoting(str)
+	char *str;
+{
+	char *cp;
+	int c;
+
+	if (!str[0])
+		return(1);
+	for (cp = str; *cp; cp++) {
+		c = *cp;
+		if (c == '\t' || c == ' ' || c == '\"' || c == '\\')
+			return(1);
+	}
+	return(0);
+}
+
+static void
+print_item_quoted(str)
+	char *str;
+{
+	char *cp;
+	int c;
+
+	putchar('\"');
+	for (cp = str; *cp; cp++) {
+		c = *cp;
+		if (c == '\t') {
+			putchar('\\');
+			putchar('t');
+			continue;
+		}
+		if (c == '\"' || c == '\\')
+			putchar('\\');
+		putchar(c);
+	}
+	putchar('\"');
+}
+
+static void
+print_item(str)
+	char *str;
+{
+	if (item_needs_quoting(str))
+		print_item_quoted(str);
+	else
+		fputs(str, stdout);
+}
+
+static void
+process_component_block()
+{
+	int i;
+
+	for (i = 0; i < 6; i++) {
+		get_line_notfirst();
+		if (!strcmp(linebuf, "]")) {
+			fprintf(stderr, "%s line %d: ] NOT expected\n",
+				infname, lineno);
+			exit(1);
+		}
+		if (!strcmp(linebuf, ")")) {
+			fprintf(stderr, "%s line %d: ) NOT expected\n",
+				infname, lineno);
+			exit(1);
+		}
+		check_line_for_nonprint_chars();
+		strcpy(savebuf[i], linebuf);
+	}
+	get_line_notfirst();
+	if (strcmp(linebuf, "]")) {
+		fprintf(stderr, "%s line %d: expected ]\n", infname, lineno);
+		exit(1);
+	}
+	print_item(savebuf[0]);
+	putchar(' ');
+	print_item(savebuf[1]);
+	putchar(' ');
+	print_item(savebuf[2]);
+	putchar(' ');
+	print_item(savebuf[3]);
+	putchar(' ');
+	print_item(savebuf[4]);
+	putchar(' ');
+	print_item(savebuf[5]);
+	putchar('\n');
+}
+
+static void
+skip_net_block()
+{
+	for (;;) {
+		get_line_notfirst();
+		if (!strcmp(linebuf, "]")) {
+			fprintf(stderr, "%s line %d: ] NOT expected\n",
+				infname, lineno);
+			exit(1);
+		}
+		if (!strcmp(linebuf, ")"))
+			break;
+	}
+}
+
+main(argc, argv)
+	char **argv;
+{
+	if (argc != 2) {
+		fprintf(stderr, "usage: %s protel-netlist-file\n", argv[0]);
+		exit(1);
+	}
+	infname = argv[1];
+	inf = fopen(infname, "r");
+	if (!inf) {
+		perror(infname);
+		exit(1);
+	}
+	for (;;) {
+		if (!get_line())
+			break;
+		if (!strcmp(linebuf, "["))
+			process_component_block();
+		else if (!strcmp(linebuf, "("))
+			skip_net_block();
+		else {
+			fprintf(stderr,
+				"%s line %d: expected beginning of block\n",
+				infname, lineno);
+			exit(1);
+		}
+	}
+	exit(0);
+}