Split file read/write functions out of ectool.c

ectool.c has gotten monstrously huge.  Refactor out some utility functions.

This is precursor work to refactoring out a lower-level flash
read/write interface.

BUG=chrome-os-partner:20571
BRANCH=none
TEST=ectool flashread 0x20000 0x80 /tmp foo -> works

Change-Id: I26dae609a73e54e8adaec56edbdce6a0bb4b8758
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/60265
Reviewed-by: Vic Yang <victoryang@chromium.org>

1 files changed, 83 insertions, 0 deletions

diff --git a/util/misc_util.c b/util/misc_util.c
new file mode 100644
index 0000000000..8410f03cfa
--- /dev/null
+++ b/util/misc_util.c
@@ -0,0 +1,83 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <ctype.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "misc_util.h"
+
+int write_file(const char *filename, const char *buf, int size)
+{
+	FILE *f;
+	int i;
+
+	/* Write to file */
+	f = fopen(filename, "wb");
+	if (!f) {
+		perror("Error opening output file");
+		return -1;
+	}
+	i = fwrite(buf, 1, size, f);
+	fclose(f);
+	if (i != size) {
+		perror("Error writing to file");
+		return -1;
+	}
+
+	return 0;
+}
+
+char *read_file(const char *filename, int *size)
+{
+	FILE *f = fopen(filename, "rb");
+	char *buf;
+	int i;
+
+	if (!f) {
+		perror("Error opening input file");
+		return NULL;
+	}
+
+	fseek(f, 0, SEEK_END);
+	*size = ftell(f);
+	rewind(f);
+	if (*size > 0x100000) {
+		fprintf(stderr, "File seems unreasonably large\n");
+		fclose(f);
+		return NULL;
+	}
+
+	buf = (char *)malloc(*size);
+	if (!buf) {
+		fprintf(stderr, "Unable to allocate buffer.\n");
+		fclose(f);
+		return NULL;
+	}
+
+	printf("Reading %d bytes from %s...\n", *size, filename);
+	i = fread(buf, 1, *size, f);
+	fclose(f);
+	if (i != *size) {
+		perror("Error reading file");
+		free(buf);
+		return NULL;
+	}
+
+	return buf;
+}
+
+int is_string_printable(const char *buf)
+{
+	while (*buf) {
+		if (!isprint(*buf))
+			return 0;
+		buf++;
+	}
+
+	return 1;
+}