libiberty: sync with gcc

This syncs binutils-gdb/libiberty with gcc/libiberty up to GCC commit
64028d626a50410dbf29.  This picks up the follow 3 GCC commits:

  ea238096883 (gcc-delete-unused-func) libiberty/argv.c: remove only_whitespace
  5e1d530da87 (gcc-buildargv) libiberty/buildargv: handle input consisting of only white space
  a87954610f5 libiberty/buildargv: POSIX behaviour for backslash handling

3 files changed, 221 insertions, 83 deletions

diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index cdcd4b3..949fec6 100644
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,24 @@
+2024-08-05  Andrew Burgess  <aburgess@redhat.com>
+
+	* argv.c (only_whitespace): Delete.
+
+2024-07-16  Andrew Burgess  <aburgess@redhat.com>
+
+	* argv.c (buildargv): Treat input of only whitespace as an empty
+	argument list.
+	(expandargv): Remove work around for intput that is only
+	whitespace.
+	* testsuite/test-expandargv.c: Add new tests 10, 11, and 12.
+	Extend testing to call buildargv in more cases.
+
+2024-07-16  Andrew Burgess  <aburgess@redhat.com>
+
+	* argv.c (buildargv): Backslashes within single quotes are
+	literal, backslashes only escape POSIX defined special characters
+	within double quotes, and backslashed newlines should act as line
+	continuations.
+	* testsuite/test-expandargv.c: Add new tests 7, 8, and 9.
+
 2024-04-02  Tom Tromey  <tom@tromey.com>
 
 	* cplus-dem.c (cplus_demangle): Try the D demangler with
diff --git a/libiberty/argv.c b/libiberty/argv.c
index 45f1685..f889432 100644
--- a/libiberty/argv.c
+++ b/libiberty/argv.c
@@ -124,15 +124,6 @@ consume_whitespace (const char **input)
     }
 }
 
-static int
-only_whitespace (const char* input)
-{
-  while (*input != EOS && ISSPACE (*input))
-    input++;
-
-  return (*input == EOS);
-}
-
 /*
 
 @deftypefn Extension char** buildargv (char *@var{sp})
@@ -212,67 +203,74 @@ char **buildargv (const char *input)
 	      argv[argc] = NULL;
 	    }
 	  /* Begin scanning arg */
-	  arg = copybuf;
-	  while (*input != EOS)
+	  if (*input != EOS)
 	    {
-	      if (ISSPACE (*input) && !squote && !dquote && !bsquote)
-		{
-		  break;
-		}
-	      else
+	      arg = copybuf;
+	      while (*input != EOS)
 		{
-		  if (bsquote)
-		    {
-		      bsquote = 0;
-		      *arg++ = *input;
-		    }
-		  else if (*input == '\\')
+		  if (ISSPACE (*input) && !squote && !dquote && !bsquote)
 		    {
-		      bsquote = 1;
-		    }
-		  else if (squote)
-		    {
-		      if (*input == '\'')
-			{
-			  squote = 0;
-			}
-		      else
-			{
-			  *arg++ = *input;
-			}
+		      break;
 		    }
-		  else if (dquote)
+		  else
 		    {
-		      if (*input == '"')
+		      if (bsquote)
 			{
-			  dquote = 0;
+			  bsquote = 0;
+			  if (*input != '\n')
+			    *arg++ = *input;
 			}
-		      else
+		      else if (*input == '\\'
+			       && !squote
+			       && (!dquote
+				   || strchr ("$`\"\\\n", *(input + 1)) != NULL))
 			{
-			  *arg++ = *input;
+			  bsquote = 1;
 			}
-		    }
-		  else
-		    {
-		      if (*input == '\'')
+		      else if (squote)
 			{
-			  squote = 1;
+			  if (*input == '\'')
+			    {
+			      squote = 0;
+			    }
+			  else
+			    {
+			      *arg++ = *input;
+			    }
 			}
-		      else if (*input == '"')
+		      else if (dquote)
 			{
-			  dquote = 1;
+			  if (*input == '"')
+			    {
+			      dquote = 0;
+			    }
+			  else
+			    {
+			      *arg++ = *input;
+			    }
 			}
 		      else
 			{
-			  *arg++ = *input;
+			  if (*input == '\'')
+			    {
+			      squote = 1;
+			    }
+			  else if (*input == '"')
+			    {
+			      dquote = 1;
+			    }
+			  else
+			    {
+			      *arg++ = *input;
+			    }
 			}
+		      input++;
 		    }
-		  input++;
 		}
+	      *arg = EOS;
+	      argv[argc] = xstrdup (copybuf);
+	      argc++;
 	    }
-	  *arg = EOS;
-	  argv[argc] = xstrdup (copybuf);
-	  argc++;
 	  argv[argc] = NULL;
 
 	  consume_whitespace (&input);
@@ -435,17 +433,8 @@ expandargv (int *argcp, char ***argvp)
 	}
       /* Add a NUL terminator.  */
       buffer[len] = '\0';
-      /* If the file is empty or contains only whitespace, buildargv would
-	 return a single empty argument.  In this context we want no arguments,
-	 instead.  */
-      if (only_whitespace (buffer))
-	{
-	  file_argv = (char **) xmalloc (sizeof (char *));
-	  file_argv[0] = NULL;
-	}
-      else
-	/* Parse the string.  */
-	file_argv = buildargv (buffer);
+      /* Parse the string.  */
+      file_argv = buildargv (buffer);
       /* If *ARGVP is not already dynamically allocated, copy it.  */
       if (*argvp == original_argv)
 	*argvp = dupargv (*argvp);
diff --git a/libiberty/testsuite/test-expandargv.c b/libiberty/testsuite/test-expandargv.c
index 1e9cb0a..ca7031e 100644
--- a/libiberty/testsuite/test-expandargv.c
+++ b/libiberty/testsuite/test-expandargv.c
@@ -142,6 +142,64 @@ const char *test_data[] = {
   "b",
   0,
 
+  /* Test 7 - No backslash removal within single quotes.  */
+  "'a\\$VAR' '\\\"'",    /* Test 7 data */
+  ARGV0,
+  "@test-expandargv-7.lst",
+  0,
+  ARGV0,
+  "a\\$VAR",
+  "\\\"",
+  0,
+
+  /* Test 8 - Remove backslash / newline pairs.  */
+  "\"ab\\\ncd\" ef\\\ngh",    /* Test 8 data */
+  ARGV0,
+  "@test-expandargv-8.lst",
+  0,
+  ARGV0,
+  "abcd",
+  "efgh",
+  0,
+
+  /* Test 9 - Backslash within double quotes.  */
+  "\"\\$VAR\" \"\\`\" \"\\\"\" \"\\\\\" \"\\n\" \"\\t\"",    /* Test 9 data */
+  ARGV0,
+  "@test-expandargv-9.lst",
+  0,
+  ARGV0,
+  "$VAR",
+  "`",
+  "\"",
+  "\\",
+  "\\n",
+  "\\t",
+  0,
+
+  /* Test 10 - Mixed white space characters.  */
+  "\t \n \t ",		/* Test 10 data */
+  ARGV0,
+  "@test-expandargv-10.lst",
+  0,
+  ARGV0,
+  0,
+
+  /* Test 11 - Single ' ' character.  */
+  " ",		/* Test 11 data */
+  ARGV0,
+  "@test-expandargv-11.lst",
+  0,
+  ARGV0,
+  0,
+
+  /* Test 12 - Multiple ' ' characters.  */
+  "   ",		/* Test 12 data */
+  ARGV0,
+  "@test-expandargv-12.lst",
+  0,
+  ARGV0,
+  0,
+
   0 /* Test done marker, don't remove. */
 };
 
@@ -231,6 +289,78 @@ erase_test (int test)
     fatal_error (__LINE__, "Failed to erase test file.", errno);
 }
 
+/* compare_argv:
+     TEST is the current test number, and NAME is a short string to identify
+     which libibery function is being tested.  ARGC_A and ARGV_A describe an
+     argument array, and this is compared to ARGC_B and ARGV_B, return 0 if
+     the two arrays match, otherwise return 1.  */
+
+static int
+compare_argv (int test, const char *name, int argc_a, char *argv_a[],
+	      int argc_b, char *argv_b[])
+{
+  int failed = 0, k;
+
+  if (argc_a != argc_b)
+    {
+      printf ("FAIL: test-%s-%d.  Argument count didn't match\n", name, test);
+      failed = 1;
+    }
+  /* Compare each of the argv's ... */
+  else
+    for (k = 0; k < argc_a; k++)
+      if (strcmp (argv_a[k], argv_b[k]) != 0)
+	{
+	  printf ("FAIL: test-%s-%d. Arguments don't match.\n", name, test);
+	  failed = 1;
+	  break;
+	}
+
+  if (!failed)
+    printf ("PASS: test-%s-%d.\n", name, test);
+
+  return failed;
+}
+
+/* test_buildargv
+     Test the buildargv function from libiberty.  TEST is the current test
+     number and TEST_INPUT is the string to pass to buildargv (after calling
+     run_replaces on it).  ARGC_AFTER and ARGV_AFTER are the expected
+     results.  Return 0 if the test passes, otherwise return 1.  */
+
+static int
+test_buildargv (int test, const char * test_input, int argc_after,
+		char *argv_after[])
+{
+  char * input, ** argv;
+  size_t len;
+  int argc, failed;
+
+  /* Generate RW copy of data for replaces */
+  len = strlen (test_input);
+  input = malloc (sizeof (char) * (len + 1));
+  if (input == NULL)
+    fatal_error (__LINE__, "Failed to malloc buildargv input buffer.", errno);
+
+  memcpy (input, test_input, sizeof (char) * (len + 1));
+  /* Run all possible replaces */
+  run_replaces (input);
+
+  /* Split INPUT into separate arguments.  */
+  argv = buildargv (input);
+
+  /* Count the arguments we got back.  */
+  argc = 0;
+  while (argv[argc])
+    ++argc;
+
+  failed = compare_argv (test, "buildargv", argc_after, argv_after, argc, argv);
+
+  free (input);
+  freeargv (argv);
+
+  return failed;
+}
 
 /* run_tests:
     Run expandargv
@@ -242,12 +372,16 @@ run_tests (const char **test_data)
 {
   int argc_after, argc_before;
   char ** argv_before, ** argv_after;
-  int i, j, k, fails, failed;
+  int i, j, k, fails;
+  const char * input_str;
 
   i = j = fails = 0;
   /* Loop over all the tests */
   while (test_data[j])
     {
+      /* Save original input in case we run a buildargv test.  */
+      input_str = test_data[j];
+
       /* Write test data */
       writeout_test (i, test_data[j++]);
       /* Copy argv before */
@@ -271,29 +405,23 @@ run_tests (const char **test_data)
       for (k = 0; k < argc_after; k++)
         run_replaces (argv_after[k]);
 
+      /* If the test input is just a file to expand then we can also test
+	 calling buildargv directly as the expected output is equivalent to
+	 calling buildargv on the contents of the file.
+
+	 The results of calling buildargv will not include the ARGV0 constant,
+	 which is why we pass 'argc_after - 1' and 'argv_after + 1', this skips
+	 over the ARGV0 in the expected results.  */
+      if (argc_before == 2)
+	fails += test_buildargv (i, input_str, argc_after - 1, argv_after + 1);
+      else
+	printf ("SKIP: test-buildargv-%d.  This test isn't for buildargv\n", i);
+
       /* Run test: Expand arguments */
       expandargv (&argc_before, &argv_before);
 
-      failed = 0;
-      /* Compare size first */
-      if (argc_before != argc_after)
-        {
-          printf ("FAIL: test-expandargv-%d. Number of arguments don't match.\n", i);
-	  failed++;
-        }
-      /* Compare each of the argv's ... */
-      else
-        for (k = 0; k < argc_after; k++)
-          if (strcmp (argv_before[k], argv_after[k]) != 0)
-            {
-              printf ("FAIL: test-expandargv-%d. Arguments don't match.\n", i);
-              failed++;
-            }
-
-      if (!failed)
-        printf ("PASS: test-expandargv-%d.\n", i);
-      else
-        fails++;
+      fails += compare_argv (i, "expandargv", argc_before, argv_before,
+			     argc_after, argv_after);
 
       freeargv (argv_before);
       freeargv (argv_after);