Newly created files

git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@2765 8092fc87-c524-0410-9efc-e669fe64eaf9
2007-05-31 02:03:10 +00:00
parent 2e2d793569
commit 6db566e8a8
4 changed files with 628 additions and 0 deletions
@@ -0,0 +1,117 @@
+/*
+ *  By Serge van den Boom (svdb@stack.nl)
+ *
+ *  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
+ */
+
+#include "util.h"
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+// Post: errno is in the state it was before the call.
+void
+vLogError(bool useErrno, const char *format, va_list args) {
+	FILE *out = stderr;
+	int savedErrno = errno;
+
+	(void) fprintf(out, "Error: ");
+	(void) vfprintf(out, format, args);
+	if (useErrno)
+		(void) fprintf(out, "Errno: %s\n", strerror(savedErrno));
+	errno = savedErrno;
+}
+
+// Post: errno is in the state it was before the call.
+void
+logError(bool useErrno, const char *format, ...) {
+	va_list args;
+
+	va_start(args, format);
+	vLogError(useErrno, format, args);
+	va_end(args);
+}
+
+void
+fatal(bool useErrno, const char *format, ...) {
+	va_list args;
+
+	va_start(args, format);
+	vLogError(useErrno, format, args);
+	va_end(args);
+
+	exit(EXIT_FAILURE);
+}
+
+int
+mmapOpen(const char *fileName, int flags, void **buf, size_t *len) {
+	int fd = -1;
+
+	if (((flags & O_ACCMODE) != O_RDONLY && (flags & O_ACCMODE) != O_RDWR)
+			|| (flags & ~O_ACCMODE) != 0) {
+		logError(false, "Invalid flags to mmapOpen.\n");
+		errno = EINVAL;
+		goto err;
+	}
+
+	fd = open(fileName, flags);
+	if (fd == -1) {
+		logError(true, "Failed to open() file '%s'.\n", fileName);
+		goto err;
+	}
+
+	struct stat statBuf;
+	if (fstat(fd, &statBuf) == -1) {
+		logError(true, "Failed to fstat() file '%s'.\n", fileName);
+		goto err;
+	}
+
+	int prot;
+	if ((flags & O_ACCMODE) == O_RDWR) {
+		prot = PROT_READ | PROT_WRITE;
+	} else
+		prot = PROT_READ;
+	void *mapAddr = mmap(NULL, (size_t) statBuf.st_size, prot, MAP_SHARED,
+			fd, 0);
+	if (mapAddr == MAP_FAILED) {
+		logError(true, "Failed to mmap() file '%s'.\n", fileName);
+		return -1;
+	}
+	
+	(void) close(fd);
+
+	*buf = mapAddr;
+	*len = (size_t) statBuf.st_size;
+	return 0;
+
+err:
+	if (fd != -1) {
+		int savedErrno = errno;
+		(void) close(fd);
+		errno = savedErrno;
+	}
+	return -1;
+}
+
+