Relocate source files to an src/ sub directory

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/fsendfile.c

@@ -0,0 +1,85 @@
+/* Copy data between file streams
+ *
+ * Copyright (c) 2013  Tobias Waldekranz <tobias@waldekranz.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+
+/**
+ * fsendfile - copy data between file streams
+ * @src: Source stream
+ * @dst: Destination stream
+ * @len: Number of bytes to copy
+ *
+ * @dst may be %NULL, in which case @len bytes are read and discarded
+ * from @src.  This can be useful for streams where seeking is not
+ * permitted.  Additionally, @len may be the special value zero (0), in
+ * which case fsendfile() will copy until %EOF is seen on @src.
+ *
+ * Returns:
+ * The number of bytes copied.  If an error is detected -1 is returned
+ * and @errno will be set accordingly.
+ */
+ssize_t fsendfile(FILE *src, FILE *dst, size_t len)
+{
+	char *buf;
+	size_t tot = 0;
+	ssize_t blk = BUFSIZ, num = 0;
+
+        if (!src) {
+                errno = EINVAL;
+                return -1;
+        }
+                
+	buf = (char *)malloc(BUFSIZ);
+	if (!buf)
+		return -1;
+
+	while (!len || tot < len) {
+		if (len && ((len - tot) < BUFSIZ))
+			blk = len - tot;
+
+		num = fread(buf, 1, blk, src);
+		if (num == 0)
+			break;
+
+		if (dst && (fwrite(buf, num, 1, dst) != 1)) {
+			num = -1;
+			break;
+		}
+
+		tot += num;
+	}
+
+	free(buf);
+
+	return (num == -1) ? -1 : (ssize_t)tot;
+}
+
+/**
+ * Local Variables:
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */