Export mbox files

1 files changed, 54 insertions, 0 deletions

diff --git a/mbox.c b/mbox.c
new file mode 100644
index 0000000..f8684de
--- /dev/null
+++ b/mbox.c
@@ -0,0 +1,54 @@
+/* Copyright (C) 2020  C. McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+
+#include "archive.h"
+
+int mboxFrom(FILE *file) {
+	int n = fprintf(file, "From mboxrd@z Thu Jan  1 00:00:00 1970\n");
+	return (n < 0 ? n : 0);
+}
+
+int mboxHeader(FILE *file, char *header) {
+	for (char *crlf; (crlf = strstr(header, "\r\n")); header = &crlf[2]) {
+		*crlf = '\0';
+		int n = fprintf(file, "%s\n", header);
+		if (n < 0) return n;
+	}
+	return 0;
+}
+
+int mboxBody(FILE *file, char *body) {
+	int n;
+	for (char *crlf; (crlf = strstr(body, "\r\n")); body = &crlf[2]) {
+		*crlf = '\0';
+		char *from = body;
+		while (*from == '>') from++;
+		if (!strncmp(from, "From ", 5)) {
+			n = fprintf(file, ">%s\n", body);
+		} else {
+			n = fprintf(file, "%s\n", body);
+		}
+		if (n < 0) return n;
+	}
+	n = fprintf(file, "\n");
+	return (n < 0 ? n : 0);
+}