From 89304337fba2cda5a823bbfd724a5bc572ea34dd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Tue, 10 Nov 2020 21:21:20 +0100
Subject: first commit

---
 rf.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 rf.c

diff --git a/rf.c b/rf.c
new file mode 100644
index 0000000..6067373
--- /dev/null
+++ b/rf.c
@@ -0,0 +1,120 @@
+#include <ctype.h>
+#include <err.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define DEFMAX 300
+
+struct ref {
+	char *a;
+	char *y;
+	char *t;
+	char *q;
+	char *d;
+	char *c;
+	char *p;
+	char *w;
+};
+
+char format_extra[DEFMAX+1];
+char format_full[DEFMAX+1];
+char format_list[DEFMAX+1];
+int refs_s;
+struct ref *refs;
+
+void record(char *dest) {
+	char c;
+	int i;
+	i = 0;
+	while (read(STDIN_FILENO, &c, 1) != 0 && isspace(c))
+		;
+	while (read(STDIN_FILENO, &c, 1) != 0)
+		dest[i++] = c;
+	dest[i] = '\0';
+}
+
+int main() {
+	char c, *buf, last[4];
+	int i, buf_s, ref_i;
+
+	buf_s = 200;
+	buf = malloc((buf_s+1) * sizeof(char));
+	if (buf == NULL) err(1, "malloc");
+
+#define reset(n) do { \
+	strncpy(last, "    ", 4); \
+	i =- n; \
+	buf[i] = '\0'; \
+} while (0)
+
+	i = 0;
+	ref_i = -1;
+
+next:
+	while (read(STDIN_FILENO, &c, 1) != 0) {
+		if (strncmp(last, "\n.F", 3) != 0)
+			goto ref;
+
+		/* record format def */
+		switch (last[4]) {
+		case 'f':
+			record(format_full);
+			break;
+		case 'x':
+			record(format_extra);
+			break;
+		case 'l':
+			record(format_list);
+			break;
+		default:
+			goto add;
+		}
+		reset(3);
+		goto next;
+
+ref:
+		if (strncmp(last, "\n.R", 3) != 0)
+			goto add;
+
+		/* record reference def */
+		switch(last[4]) {
+		case 'a':
+			reset(3);
+			if (ref_i+1 > refs_s) {
+				refs_s += 10;
+				refs = realloc(refs, refs_s*sizeof(struct ref));
+				if (refs == NULL) err(1, "realloc");
+			}
+			ref_i++;
+			refs[ref_i].a = malloc((DEFMAX+1) * sizeof(char));
+			if (refs[ref_i].a == NULL) err(1, "malloc");
+			record(refs[ref_i].a);
+			break;
+		case 'y':
+			break;
+		default:
+			goto add;
+		}
+		reset(3);
+		goto next;
+
+add:
+		/* add to buffer */
+		if (i+1 > buf_s) {
+			buf_s += 100;
+			buf = realloc(buf, (buf_s+1) * sizeof(char));
+			if (buf == NULL) err(1, "realloc");
+		}
+		buf[i++] = c;
+
+		/* keep track of last 4 characters */
+		if (i <= 4) last[i] = c;
+		else {
+			memmove(last, last+1, 3);
+			last[3] = c;
+		}
+	}
+}
-- 
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