From 7f6002caba3f0a6749820c2772161caf55b8d267 Mon Sep 17 00:00:00 2001
From: neonloop
Date: Fri, 7 May 2021 20:00:12 +0000
Subject: Initial commit (uqm-0.8.0)

---
 src/libs/file/files.c | 165 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100644 src/libs/file/files.c

(limited to 'src/libs/file/files.c')

diff --git a/src/libs/file/files.c b/src/libs/file/files.c
new file mode 100644
index 0000000..5ce7dac
--- /dev/null
+++ b/src/libs/file/files.c
@@ -0,0 +1,165 @@
+/*
+ *  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.
+ */
+
+// Contains code handling files
+
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include "port.h"
+#include "libs/uio.h"
+#include "config.h"
+#include "types.h"
+#include "filintrn.h"
+#include "libs/memlib.h"
+#include "libs/log.h"
+
+static int copyError(uio_Handle *srcHandle, uio_Handle *dstHandle,
+		uio_DirHandle *unlinkHandle, const char *unlinkPath, uint8 *buf);
+
+bool
+fileExists (const char *name)
+{
+	return access (name, F_OK) == 0;
+}
+
+bool
+fileExists2(uio_DirHandle *dir, const char *fileName)
+{
+	uio_Stream *stream;
+
+	stream = uio_fopen (dir, fileName, "rb");
+	if (stream == NULL)
+		return 0;
+
+	uio_fclose (stream);
+	return 1;
+}
+
+/*
+ * Copy a file with path srcName to a file with name newName.
+ * If the destination already exists, the operation fails.
+ * Links are followed.
+ * Special files (fifos, char devices, block devices, etc) will be
+ * read as long as there is data available and the destination will be
+ * a regular file with that data.
+ * The new file will have the same permissions as the old.
+ * If an error occurs during copying, an attempt will be made to
+ * remove the copy.
+ */
+int
+copyFile (uio_DirHandle *srcDir, const char *srcName,
+		uio_DirHandle *dstDir, const char *newName)
+{
+	uio_Handle *src, *dst;
+	struct stat sb;
+#define BUFSIZE 65536
+	uint8 *buf, *bufPtr;
+	ssize_t numInBuf, numWritten;
+	
+	src = uio_open (srcDir, srcName, O_RDONLY
+#ifdef WIN32
+			| O_BINARY
+#endif
+			, 0);
+	if (src == NULL)
+		return -1;
+	
+	if (uio_fstat (src, &sb) == -1)
+		return copyError (src, NULL, NULL, NULL, NULL);
+	
+	dst = uio_open (dstDir, newName, O_WRONLY | O_CREAT | O_EXCL
+#ifdef WIN32
+			| O_BINARY
+#endif
+			, sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO));
+	if (dst == NULL)
+		return copyError (src, NULL, NULL, NULL, NULL);
+	
+	buf = HMalloc(BUFSIZE);
+			// This was originally a statically allocated buffer,
+			// but as this function might be run from a thread with
+			// a small stack, this is better.
+	while (1)
+	{
+		numInBuf = uio_read (src, buf, BUFSIZE);
+		if (numInBuf == -1)
+		{
+			if (errno == EINTR)
+				continue;
+			return copyError (src, dst, dstDir, newName, buf);
+		}
+		if (numInBuf == 0)
+			break;
+		
+		bufPtr = buf;
+		do
+		{
+			numWritten = uio_write (dst, bufPtr, numInBuf);
+			if (numWritten == -1)
+			{
+				if (errno == EINTR)
+					continue;
+				return copyError (src, dst, dstDir, newName, buf);
+			}
+			numInBuf -= numWritten;
+			bufPtr += numWritten;
+		} while (numInBuf > 0);
+	}
+	
+	HFree (buf);
+	uio_close (src);
+	uio_close (dst);
+	errno = 0;
+	return 0;
+}
+
+/*
+ * Closes srcHandle if it's not -1.
+ * Closes dstHandle if it's not -1.
+ * Removes unlinkpath from the unlinkHandle dir if it's not NULL.
+ * Frees 'buf' if not NULL.
+ * Always returns -1.
+ * errno is what was before the call.
+ */
+static int
+copyError(uio_Handle *srcHandle, uio_Handle *dstHandle,
+		uio_DirHandle *unlinkHandle, const char *unlinkPath, uint8 *buf)
+{
+	int savedErrno;
+
+	savedErrno = errno;
+
+	log_add (log_Debug, "Error while copying: %s", strerror (errno));
+
+	if (srcHandle != NULL)
+		uio_close (srcHandle);
+	
+	if (dstHandle != NULL)
+		uio_close (dstHandle);
+	
+	if (unlinkPath != NULL)
+		uio_unlink (unlinkHandle, unlinkPath);
+	
+	if (buf != NULL)
+		HFree(buf);
+	
+	errno = savedErrno;
+	return -1;
+}
+
-- 
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