1 files changed, 101 insertions, 0 deletions
diff --git a/sys/boot/common/load.c b/sys/boot/common/load.c
new file mode 100644
index 0000000..d59fdf3
--- /dev/null
+++ b/sys/boot/common/load.c
@@ -0,0 +1,101 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	$Id$
+ */
+
+#include <stand.h>
+
+#define LOAD_TINYBUF	2048
+
+/*
+ * Attempt to load the file at (path) into an allocated
+ * area on the heap, return a pointer to it or NULL
+ * on failure.
+ *
+ * Because in many cases it is impossible to determine the
+ * true size of a file without reading it, we do just that.
+ */
+char *
+filedup(const char *path, int flags)
+{
+    char	*buf;
+    int		fd;
+    size_t	size, result;
+    
+    if ((fd = open(path, F_READ | flags)) == -1)
+	return(NULL);
+    
+    printf("%s open, flags 0x%x\n", path, files[fd].f_flags);
+    buf = alloc(LOAD_TINYBUF);
+
+    /* Read the first buffer-full */
+    size = read(fd, buf, LOAD_TINYBUF);
+    if (size < 1) {
+	free(buf, LOAD_TINYBUF);
+	close(fd);
+	return(NULL);
+    }
+    /* If it all fitted, then just return the buffer straight out */
+    if (size < LOAD_TINYBUF) {
+	close(fd);
+	buf[size] = 0;
+	return(buf);
+    }
+
+    printf("tinybuf loaded, size %d\n", size);
+    getchar();
+    
+    
+    /* Read everything until we know how big it is */
+    for (;;) {
+	result = read(fd, buf, LOAD_TINYBUF);
+	if (size == -1) {
+	    free(buf, LOAD_TINYBUF);
+	    close(fd);
+	    return(NULL);
+	}
+	if (result == 0)
+	    break;
+	size += result;
+    }
+    
+    /* discard the old buffer, close the file */
+    free(buf, LOAD_TINYBUF);
+    close(fd);
+
+    /* reopen the file, realloc the buffer */
+    if ((fd = open(path, F_READ | flags)) == -1)
+	return(NULL);
+    buf = alloc(size);
+    result = read(fd, buf, size);
+    close(fd);
+    if (result != size) {
+	free(buf, size);
+	return(NULL);
+    }
+    return(buf);
+}
+