[U-Boot] [PATCH 6/9] mkenvimage: Use mmap() when reading from a regular file

[David Wagner <david.wagner@free-electrons.com>]

Signed-off-by: David Wagner <david.wagner@free-electrons.com>
---
 tools/mkenvimage.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/tools/mkenvimage.c b/tools/mkenvimage.c
index 86a4e05..74b296e 100644
--- a/tools/mkenvimage.c
+++ b/tools/mkenvimage.c
@@ -35,6 +35,7 @@
 #include "compiler.h"
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/mman.h>
 
 #include "u-boot/crc.h"
 
@@ -190,14 +191,16 @@ int main(int argc, char **argv)
 		}
 
 		filesize = txt_file_stat.st_size;
-		/* Read the raw input file and transform it */
-		filebuf = malloc(sizeof(*envptr) * filesize);
-		ret = read(txt_fd, filebuf, sizeof(*envptr) * filesize);
-		if (ret != sizeof(*envptr) * filesize) {
-			fprintf(stderr, "Can't read the whole input file\n");
+
+		filebuf = mmap(NULL, sizeof(*envptr) * filesize, PROT_READ,
+			       MAP_PRIVATE, txt_fd, 0);
+		ret = close(txt_fd);
+		if (filebuf == MAP_FAILED) {
+			fprintf(stderr, "mmap (%d bytes) failed: %s\n",
+					sizeof(*envptr) * filesize,
+					strerror(errno));
 			return EXIT_FAILURE;
 		}
-		ret = close(txt_fd);
 	}
 	/* The +1 is for the additionnal ending \0. See below. */
 	if (filesize + 1 > envsize) {
-- 
1.7.7.3