[LTP] [PATCH v1] nm01: Fix BSD vs POSIX format comparison failure on Power

[Wei Gao]

On Power architecture, symbol names can contain hex-like prefixes such
as "0000003e.plt_call.__gmon_start__".

In our openqa specific power system, the gensub seems has some
compatible issue which you can see following trace, the BSD format's
symbol name was incorrectly trimmed to ".plt_call.__gmon_start__"
(losing the "3e"), while the POSIX format kept it as
"3e.plt_call.__gmon_start__".

Example failure from a Power machine:
--- DEBUG nm01_sh ---
--- RAW BSD ---
00000000000005e0 t 0000003e.plt_call.__gmon_start__
--- RAW POSIX ---
0000003e.plt_call.__gmon_start__ t 5e0
--- REPRO LTP LOGIC ---
--- TRIMMED BSD ---
5e0 t .plt_call.__gmon_start__
--- TRIMMED POSIX ---
3e.plt_call.__gmon_start__ t 5e0
--- REORDERED BSD (nm1) ---
.plt_call.__gmon_start__t5e0
--- REORDERED POSIX (nm2) ---
3e.plt_call.__gmon_start__t5e0
--- DIFF RESULT ---
--- /tmp/dbg_nm1	2026-05-11 22:33:54.754648941 -0400
+++ /tmp/dbg_nm2	2026-05-11 22:33:54.761924742 -0400
@@ -1,7 +1,7 @@
-.plt_call.__gmon_start__t5e0
+3e.plt_call.__gmon_start__t5e0
--- END DEBUG ---

Replace the global gensub to simple sub approach with targeted field processing in awk
can fix the issue.

Signed-off-by: Wei Gao <wegao@suse.com>
---
 testcases/commands/nm/nm01.sh | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/testcases/commands/nm/nm01.sh b/testcases/commands/nm/nm01.sh
index c795d47ff..2ca73c4ea 100755
--- a/testcases/commands/nm/nm01.sh
+++ b/testcases/commands/nm/nm01.sh
@@ -83,17 +83,28 @@ test5()
 	EXPECT_PASS $NM -f bsd $TST_DATAROOT/f1 \> nm_bsd.out
 	EXPECT_PASS $NM -f posix $TST_DATAROOT/f1 \> nm_posix.out
 
-	ROD awk '{print gensub(/\y(0+)([0-9a-fA-F]+)\y/, "\\2", "g")}' nm_bsd.out \> trimmed_nm_bsd.out
-	ROD awk '{print gensub(/\y(0+)([0-9a-fA-F]+)\y/, "\\2", "g")}' nm_posix.out \> trimmed_nm_posix.out
-
-	ROD awk '{print $3 $2 $1}' trimmed_nm_bsd.out \> nm1.out
-	ROD awk '{print $1 $2 $3}' trimmed_nm_posix.out \> nm2.out
+	ROD awk '{
+		if (NF == 2) { val = "0"; type = $1; name = $2; }
+		else { val = $1; type = $2; name = $3; }
+		sub(/^0+/, "", val); if (val == "") val = "0";
+		sub(/^0+/, "", name);
+		print name type val
+	}' nm_bsd.out \> nm1.out
+
+	ROD awk '{
+		val = $3; type = $2; name = $1;
+		sub(/^0+/, "", val); if (val == "") val = "0";
+		sub(/^0+/, "", name);
+		print name type val
+	}' nm_posix.out \> nm2.out
 
 	if diff nm1.out nm2.out > /dev/null; then
 		tst_res TPASS "Got BSD format with -f bsd"
 	else
 		tst_res TFAIL "Got wrong format with -f bsd"
 		cat nm_bsd.out
+		cat nm_posix.out
+		diff -u nm1.out nm2.out
 	fi
 }
 
-- 
2.52.0