git: f6d95a01103a - main - elftcl: add -i flag to ignore unknown flags

[Ed Maste]

The branch main has been updated by emaste:

URL: https://cgit.FreeBSD.org/src/commit/?id=f6d95a01103a49a94c876d5a51bb4be25c06d964

commit f6d95a01103a49a94c876d5a51bb4be25c06d964
Author:     Ed Maste <emaste at FreeBSD.org>
AuthorDate: 2021-01-13 03:24:52 +0000
Commit:     Ed Maste <emaste at FreeBSD.org>
CommitDate: 2021-01-13 05:10:13 +0000

    elftcl: add -i flag to ignore unknown flags
    
    This may allow an identical elfctl invocation to be used on multiple
    FreeBSD versions, with features not implemented on older releases being
    silently ignored.
    
    PR:             252629 (related)
    Reviewed by:    kib
    MFC after:      1 week
    Sponsored by:   The FreeBSD Foundation
    Differential Revision: https://reviews.freebsd.org/D28130
---
 usr.bin/elfctl/elfctl.1 |  6 +++++-
 usr.bin/elfctl/elfctl.c | 13 ++++++++++---
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/usr.bin/elfctl/elfctl.1 b/usr.bin/elfctl/elfctl.1
index 176c2c42b22a..f93b558fdf0d 100644
--- a/usr.bin/elfctl/elfctl.1
+++ b/usr.bin/elfctl/elfctl.1
@@ -26,7 +26,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd March 1, 2020
+.Dd January 12, 2021
 .Dt ELFCTL 1
 .Os
 .Sh NAME
@@ -35,6 +35,7 @@
 .Sh SYNOPSIS
 .Nm
 .Op Fl h | Fl -help
+.Op Fl i
 .Op Fl l
 .Op Fl e Ar featurelist
 .Ar
@@ -47,6 +48,9 @@ The options are as follows:
 .Bl -tag -width indent
 .It Fl h | Fl -help
 Print a usage message and exit.
+.It Fl i
+Ignore unknown feature flags in
+.Ar featurelist .
 .It Fl l
 List known ELF feature flags.
 .It Fl e Ar featurelist
diff --git a/usr.bin/elfctl/elfctl.c b/usr.bin/elfctl/elfctl.c
index e9b93e697ef7..9d75c002d82c 100644
--- a/usr.bin/elfctl/elfctl.c
+++ b/usr.bin/elfctl/elfctl.c
@@ -81,7 +81,9 @@ static struct option long_opts[] = {
 #else
 #define SUPPORTED_ENDIAN ELFDATA2MSB
 #endif
-		
+
+static bool iflag;
+
 int
 main(int argc, char **argv)
 {
@@ -100,8 +102,11 @@ main(int argc, char **argv)
 	if (elf_version(EV_CURRENT) == EV_NONE)
 		errx(EXIT_FAILURE, "elf_version error");
 
-	while ((ch = getopt_long(argc, argv, "hle:", long_opts, NULL)) != -1) {
+	while ((ch = getopt_long(argc, argv, "hile:", long_opts, NULL)) != -1) {
 		switch (ch) {
+		case 'i':
+			iflag = true;
+			break;
 		case 'l':
 			print_features();
 			lflag = true;
@@ -197,6 +202,7 @@ Usage: %s [options] file...\n\
   Set or display the control features for an ELF object.\n\n\
   Supported options are:\n\
   -l                        List known control features.\n\
+  -i                        Ignore unknown features.\n\
   -e [+-=]feature,list      Edit features from a comma separated list.\n\
   -h | --help               Print a usage message and exit.\n"
 
@@ -229,7 +235,8 @@ convert_to_feature_val(char *feature_str, uint32_t *feature_val)
 		}
 		if (i == len) {
 			warnx("%s is not a valid feature", feature);
-			return (false);
+			if (!iflag)
+				return (false);
 		}
 	}