From fe8804c8d8e649159bd0fd506785fe17c16119a9 Mon Sep 17 00:00:00 2001
From: Henrik Hautakoski <henrik.hautakoski@gmail.com>
Date: Wed, 31 Oct 2018 17:52:21 +0100
Subject: [PATCH] add program module

---
 src/program.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 src/program.h | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 77 insertions(+)
 create mode 100644 src/program.c
 create mode 100644 src/program.h

diff --git a/src/program.c b/src/program.c
new file mode 100644
index 0000000..975f5c0
--- /dev/null
+++ b/src/program.c
@@ -0,0 +1,45 @@
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include "program.h"
+
+int program_loadfromfile(struct program *prog, const char *filename) {
+
+	struct stat st;
+	ssize_t rc = -1;
+	int fd;
+
+	fd = open(filename, O_RDONLY);
+	if (fd < 0) {
+		fprintf(stderr, "Could not open file %s: %s\n",
+			filename, strerror(errno));
+		return -1;
+	}
+
+	if (fstat(fd, &st) < 0)
+		goto close_fd;
+
+	prog->len = st.st_size;
+	prog->instr = malloc(prog->len);
+	if (prog->instr == NULL)
+		goto close_fd;
+
+	rc = read(fd, prog->instr, prog->len);
+	if (rc < 0)
+		goto free_mem;
+	return rc;
+free_mem: free(prog->instr);
+close_fd: close(fd);
+	return rc;
+}
+
+void program_free(struct program *prog) {
+
+	free(prog->instr);
+	prog->len = 0;
+}
diff --git a/src/program.h b/src/program.h
new file mode 100644
index 0000000..3533d2d
--- /dev/null
+++ b/src/program.h
@@ -0,0 +1,32 @@
+/* program.h
+ *
+ *   Copyright (C) 2012,2014   Henrik Hautakoski <henrik.hautakoski@gmail.com>
+ *
+ *   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 2 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, write to the Free Software
+ *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ *   MA 02110-1301, USA.
+ */
+#ifndef LOADER_H
+#define LOADER_H
+
+struct program {
+	unsigned char *instr;
+	unsigned len;
+};
+
+int program_loadfromfile(struct program *prog, const char *filename);
+
+void program_free(struct program *prog);
+
+#endif /* LOADER_H */