[S] Change in coreboot[master]: util/amdfwtool/amdfwread: Fix incorrect option index

[Martin L Roth (Code Review)]

Martin L Roth has submitted this change. ( https://review.coreboot.org/c/coreboot/+/66553 )

(

6 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: util/amdfwtool/amdfwread: Fix incorrect option index
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util/amdfwtool/amdfwread: Fix incorrect option index

index I/O argument to getopt_long is not the index to argv. Instead it
is an index into the optlong array corresponding to the parsed option.
Also getopt() uses a global variable optind to track the index of the
next argument to be processed. Use the optindex variable as an index to
extract the filename from argv.

BUG=None
TEST=Build and use amdfwread to read the Soft-fuse bits from Guybrush
BIOS image. Observed no changes before and after the changes.

Change-Id: I33c74a0c8e12c5af76954524cf7294b7541d286b
Signed-off-by: Karthikeyan Ramasubramanian 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66553
Reviewed-by: Robert Zieba 
Reviewed-by: Raul Rangel 
Tested-by: build bot (Jenkins) 
---
M util/amdfwtool/amdfwread.c
1 file changed, 29 insertions(+), 6 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Raul Rangel: Looks good to me, approved
  Robert Zieba: Looks good to me, but someone else must approve

diff --git a/util/amdfwtool/amdfwread.c b/util/amdfwtool/amdfwread.c
index 1a95c5c..c9da3d8 100644
--- a/util/amdfwtool/amdfwread.c
+++ b/util/amdfwtool/amdfwread.c
@@ -179,19 +179,18 @@
    char *fw_file = NULL;

int selected_functions = 0;
-	int index = 0;
    while (1) {
-		int opt = getopt_long(argc, argv, optstring, long_options, &index);
+		int opt = getopt_long(argc, argv, optstring, long_options, NULL);

if (opt == -1) {
-			index++;
-			if (index >= argc) {
-				/* Print usage if we didn't get any arguments */
+			if (optind != (argc - 1)) {
+				/* Print usage if one and only one option i.e. filename is
+				   not found. */
    			print_usage();
    			return 0;
    		}

-			fw_file = argv[index];
+			fw_file = argv[optind];
    		break;
    	}