[PATCH] @file command-file bug fix

[Daniel Gutson <dgutson at codesourcery dot com>]

Hi,
   the attached libiberty patch fixes a bug in the processing of @file 
command-line options, that caused any options in @file following a blank 
line to be ignored.

I added some test cases to test-expandargv in order to cover the failing 
cases.

Please let me know if OK to commit.

Thanks!
	Daniel.

---
2009-10-07  Daniel Gutson  <dgutson@codesourcery.com>
        Daniel Jacobowitz  <dan@codesourcery.com>
        Pedro Alves  <pedro@codesourcery.com>

    libiberty/
    * argv.c (consume_whitespace): New function.
    (only_whitespace): New function.
    (buildargv): Always use ISSPACE by calling consume_whitespace.
    (expandargv): Skip empty files.  Do not stop at the first empty
    argument (calling only_whitespace)..
    * testsuite/test-expandargv.c: (test_data): Test empty lines
    and empty arguments.
    (run_tests): Fix false positives due to shorter arguments.


--
Daniel Gutson
CodeSourcery
www.codesourcery.com

Index: libiberty/testsuite/test-expandargv.c
===================================================================
--- libiberty/testsuite/test-expandargv.c	(revision 152543)
+++ libiberty/testsuite/test-expandargv.c	(working copy)
@@ -107,6 +107,38 @@ const char *test_data[] = {
   ARGV0,
   0,
 
+  /* Test 4 - Check for options beginning with an empty line.  */
+  "\na\nb",	/* Test 4 data */
+  ARGV0,
+  "@test-expandargv-4.lst",
+  0,
+  ARGV0,
+  "a",
+  "b",
+  0,
+
+  /* Test 5 - Check for options containing an empty argument.  */
+  "a\n''\nb",    /* Test 5 data */
+  ARGV0,
+  "@test-expandargv-5.lst",
+  0,
+  ARGV0,
+  "a",
+  "",
+  "b",
+  0,
+
+  /* Test 6 - Check for options containing a quoted newline.  */
+  "a\n'a\n\nb'\nb",    /* Test 6 data */
+  ARGV0,
+  "@test-expandargv-6.lst",
+  0,
+  ARGV0,
+  "a",
+  "a\n\nb",
+  "b",
+  0,
+
   0 /* Test done marker, don't remove. */
 };
 
@@ -246,7 +278,7 @@ run_tests (const char **test_data)
       /* Compare each of the argv's ... */
       else
         for (k = 0; k < argc_after; k++)
-          if (strncmp (argv_before[k], argv_after[k], strlen(argv_after[k])) != 0)
+          if (strcmp (argv_before[k], argv_after[k]) != 0)
             {
               printf ("FAIL: test-expandargv-%d. Arguments don't match.\n", i);
               failed++;
Index: libiberty/argv.c
===================================================================
--- libiberty/argv.c	(revision 152543)
+++ libiberty/argv.c	(working copy)
@@ -119,6 +119,24 @@ void freeargv (char **vector)
     }
 }
 
+static void
+consume_whitespace (const char **input)
+{
+  while (ISSPACE (**input))
+    {
+      (*input)++;
+    }
+}
+
+static int
+only_whitespace (const char* input)
+{
+  while (*input != EOS && ISSPACE (*input))
+    input++;
+
+  return (*input == EOS);
+}
+
 /*
 
 @deftypefn Extension char** buildargv (char *@var{sp})
@@ -179,10 +197,8 @@ char **buildargv (const char *input)
       do
 	{
 	  /* Pick off argv[argc] */
-	  while (ISBLANK (*input))
-	    {
-	      input++;
-	    }
+	  consume_whitespace (&input);
+
 	  if ((maxargc == 0) || (argc >= (maxargc - 1)))
 	    {
 	      /* argv needs initialization, or expansion */
@@ -278,10 +294,7 @@ char **buildargv (const char *input)
 	  argc++;
 	  argv[argc] = NULL;
 
-	  while (ISSPACE (*input))
-	    {
-	      input++;
-	    }
+	  consume_whitespace (&input);
 	}
       while (*input != EOS);
     }
@@ -420,8 +433,17 @@ expandargv (int *argcp, char ***argvp)
 	goto error;
       /* Add a NUL terminator.  */
       buffer[len] = '\0';
-      /* Parse the string.  */
-      file_argv = buildargv (buffer);
+      /* 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 **) malloc (sizeof (char *));
+	  file_argv[0] = NULL;
+	}
+      else
+	/* Parse the string.  */
+	file_argv = buildargv (buffer);
       /* If *ARGVP is not already dynamically allocated, copy it.  */
       if (!argv_dynamic)
 	{
@@ -434,7 +456,7 @@ expandargv (int *argcp, char ***argvp)
 	}
       /* Count the number of arguments.  */
       file_argc = 0;
-      while (file_argv[file_argc] && *file_argv[file_argc])
+      while (file_argv[file_argc])
 	++file_argc;
       /* Now, insert FILE_ARGV into ARGV.  The "+1" below handles the
 	 NULL terminator at the end of ARGV.  */