[gPXE] fix pxecall to load tftp files

[Frediano Ziglio]

Hi,
  if file name has a # inside the name (or other special characters) pxe
code that stay resident does not encode name leading to an incorrect
URI. This patch fix the issue encoding file name.

--- a/src/arch/i386/interface/pxe/pxe_tftp.c	Tue Jan 17 13:36:37 2012 +0000
+++ b/src/arch/i386/interface/pxe/pxe_tftp.c	Wed Jan 18 16:45:21 2012 +0000
@@ -30,6 +30,8 @@
 #include <byteswap.h>
 #include <gpxe/uaccess.h>
 #include <gpxe/in.h>
+#include <gpxe/uri.h>
+#include <gpxe/vsprintf.h>
 #include <gpxe/tftp.h>
 #include <gpxe/xfer.h>
 #include <gpxe/open.h>
@@ -168,6 +170,7 @@
 			   const unsigned char *filename, size_t blksize,
 			   int sizeonly ) {
 	char uri_string[PXE_TFTP_URI_LEN];
+	ssize_t len;
 	struct in_addr address;
 	int rc;
 
@@ -182,11 +185,13 @@
 		port = htons ( TFTP_PORT );
 	if ( blksize < TFTP_DEFAULT_BLKSIZE )
 		blksize = TFTP_DEFAULT_BLKSIZE;
-	snprintf ( uri_string, sizeof ( uri_string ),
-		   "tftp%s://%s:%d%s%s?blksize=%zd",
+	len = ssnprintf ( uri_string, sizeof ( uri_string ),
+		   "tftp%s://%s:%d%s",
 		   sizeonly ? "size" : "",
 		   inet_ntoa ( address ), ntohs ( port ),
-		   ( ( filename[0] == '/' ) ? "" : "/" ), filename, blksize );
+		   ( ( filename[0] == '/' ) ? "" : "/" ));
+	len += uri_encode( filename, uri_string + len, sizeof ( uri_string ) - len, URI_PATH);
+	ssnprintf(uri_string + len, sizeof ( uri_string ) - len, "?blksize=%zd", blksize );
 	DBG ( " %s", uri_string );
 
 	/* Open PXE TFTP connection */


Regards
  Frediano