gas strncpy warning

Avoid a warning that the buffer may not be zero terminated.

	* read.c (read_a_source_file): Call strncpy with length one
	less than size of original_case_string.

2 files changed, 7 insertions, 1 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index d00fb87..001af54 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,5 +1,10 @@
 2020-02-26  Alan Modra  <amodra@gmail.com>
 
+	* read.c (read_a_source_file): Call strncpy with length one
+	less than size of original_case_string.
+
+2020-02-26  Alan Modra  <amodra@gmail.com>
+
 	* config/obj-elf.c: Indent labels correctly.
 	* config/obj-macho.c: Likewise.
 	* config/tc-aarch64.c: Likewise.
diff --git a/gas/read.c b/gas/read.c
index e603099..784d6a8 100644
--- a/gas/read.c
+++ b/gas/read.c
@@ -1052,7 +1052,8 @@ read_a_source_file (const char *name)
 		  {
 		    char *s2 = s;
 
-		    strncpy (original_case_string, s2, sizeof (original_case_string));
+		    strncpy (original_case_string, s2,
+			     sizeof (original_case_string) - 1);
 		    original_case_string[sizeof (original_case_string) - 1] = 0;
 
 		    while (*s2)