From e7d6d472c21aa80c28be01c0d6dcbfd250d57a25 Mon Sep 17 00:00:00 2001
From: nima <nima@abc39116-655e-4be6-ad55-d661dc543056>
Date: Mon, 30 Jun 2008 12:08:58 +0000
Subject: First commit to SVN.

git-svn-id: svn://svn.autonomy.net.au/python-dmidecode@1 abc39116-655e-4be6-ad55-d661dc543056
---
 util.c | 165 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100644 util.c

(limited to 'util.c')

diff --git a/util.c b/util.c
new file mode 100644
index 0000000..9eda714
--- /dev/null
+++ b/util.c
@@ -0,0 +1,165 @@
+/*
+ * Common "util" functions
+ * This file is part of the dmidecode project.
+ *
+ *   (C) 2002-2005 Jean Delvare <khali@linux-fr>
+ *
+ *   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ *   For the avoidance of doubt the "preferred form" of this code is one which
+ *   is in an open unpatent encumbered format. Where cryptographic key signing
+ *   forms part of the process of creating an executable the information 
+ *   including keys needed to generate an equivalently functional executable
+ *   are deemed to be part of the source code.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include "config.h"
+
+#ifdef USE_MMAP
+#include <sys/mman.h>
+#ifndef MAP_FAILED
+#define MAP_FAILED ((void *) -1)
+#endif /* !MAP_FAILED */
+#endif /* USE MMAP */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "types.h"
+#include "util.h"
+
+#ifndef USE_MMAP
+static int myread(int fd, u8 *buf, size_t count, const char *prefix)
+{
+	ssize_t r=1;
+	size_t r2=0;
+	
+	while(r2!=count && r!=0)
+	{
+		r=read(fd, buf+r2, count-r2);
+		if(r==-1)
+		{
+			if(errno!=EINTR)
+			{
+				close(fd);
+				perror(prefix);
+				return -1;
+			}
+		}
+		else
+			r2+=r;
+	}
+	
+	if(r2!=count)
+	{
+		close(fd);
+		fprintf(stderr, "%s: Unexpected end of file\n", prefix);
+		return -1;
+	}
+	
+	return 0;
+}
+#endif
+
+int checksum(const u8 *buf, size_t len)
+{
+	u8 sum=0;
+	size_t a;
+	
+	for(a=0; a<len; a++)
+		sum+=buf[a];
+	return (sum==0);
+}
+
+/*
+ * Copy a physical memory chunk into a memory buffer.
+ * This function allocates memory.
+ */
+void *mem_chunk(size_t base, size_t len, const char *devmem)
+{
+	void *p;
+	int fd;
+#ifdef USE_MMAP
+	size_t mmoffset;
+	void *mmp;
+#endif
+	
+	if((fd=open(devmem, O_RDONLY))==-1)
+	{
+		perror(devmem);
+		return NULL;
+	}
+	
+	if((p=malloc(len))==NULL)
+	{
+		perror("malloc");
+		return NULL;
+	}
+	
+#ifdef USE_MMAP
+#ifdef _SC_PAGESIZE
+	mmoffset=base%sysconf(_SC_PAGESIZE);
+#else
+	mmoffset=base%getpagesize();
+#endif /* _SC_PAGESIZE */
+	/*
+	 * Please note that we don't use mmap() for performance reasons here,
+	 * but to workaround problems many people encountered when trying
+	 * to read from /dev/mem using regular read() calls.
+	 */
+	mmp=mmap(0, mmoffset+len, PROT_READ, MAP_SHARED, fd, base-mmoffset);
+	if(mmp==MAP_FAILED)
+	{
+		fprintf(stderr, "%s: ", devmem);
+		perror("mmap");
+		free(p);
+		return NULL;
+	}
+	
+	memcpy(p, (u8 *)mmp+mmoffset, len);
+	
+	if(munmap(mmp, mmoffset+len)==-1)
+	{
+		fprintf(stderr, "%s: ", devmem);
+		perror("munmap");
+	}
+#else /* USE_MMAP */
+	if(lseek(fd, base, SEEK_SET)==-1)
+	{
+		fprintf(stderr, "%s: ", devmem);
+		perror("lseek");
+		free(p);
+		return NULL;
+	}
+	
+	if(myread(fd, p, len, devmem)==-1)
+	{
+		free(p);
+		return NULL;
+	}
+#endif /* USE_MMAP */
+	
+	if(close(fd)==-1)
+		perror(devmem);
+	
+	return p;
+}
-- 
cgit