--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/f-demime/attach_out.c	Sat May 06 06:14:03 2023 +0000
@@ -0,0 +1,57 @@
+/*
+ * This module contains code for creating (writing) secondary output files
+ * intended for storing attached base64 blobs.
+ */
+
+#include <sys/file.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <unistd.h>
+#include "defs.h"
+
+extern char *att_filename_buf, *att_filename_tail;
+extern void (*dec_outf)();
+
+static unsigned att_count;
+static FILE *att_outf;
+static int giveup_flag;
+
+static void
+output_func(ch)
+{
+	putc(ch, att_outf);
+}
+
+init_attach_out()
+{
+	int fd;
+
+	if (giveup_flag)
+		return(-1);
+	for (;;) {
+		if (att_count >= 10000) {
+			giveup_flag = 1;
+			return(-1);
+		}
+		sprintf(att_filename_tail, "%04u", att_count++);
+		fd = open(att_filename_buf, O_WRONLY|O_CREAT|O_EXCL, 0644);
+		if (fd >= 0)
+			break;
+	}
+	att_outf = fdopen(fd, "w");
+	if (!att_outf) {
+		perror("fdopen");
+		close(fd);
+		return(-1);
+	}
+	dec_outf = output_func;
+	return(0);
+}
+
+void
+attach_out_finish()
+{
+	fclose(att_outf);
+}