OpenCellular/util/misc_util.c

/* 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;
}