[RFA 03/23] Use gdb_file_up in find_and_open_script

[Tom Tromey <tom@tromey.com>]

This changes find_and_open_script to return a gdb_file_up.  The result
is also used to indicate whether the function succeeded, so the patch
also removes the "streamp" argument; and finally, the type of the
"full_path" argument is changed to remove more cleanups from the
callers.

ChangeLog
2017-05-02  Tom Tromey  <tom@tromey.com>

	* cli/cli-cmds.c (find_and_open_script): Return gdb_file_p.
	Remove "streamp" argument.  Change "full_path" to a
	unique_xmalloc_ptr.
	(source_script_with_search): Update.
	* auto-load.c (source_script_file): Update.
	* cli/cli-cmds.h (find_and_open_script): Change type.
---
 gdb/ChangeLog      |  9 +++++++++
 gdb/auto-load.c    | 32 ++++++++++++++------------------
 gdb/cli/cli-cmds.c | 35 +++++++++++++++--------------------
 gdb/cli/cli-cmds.h |  7 +++++--
 4 files changed, 43 insertions(+), 40 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 2bda6ff..76c53be 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,14 @@
 2017-05-02  Tom Tromey  <tom@tromey.com>
 
+	* cli/cli-cmds.c (find_and_open_script): Return gdb_file_p.
+	Remove "streamp" argument.  Change "full_path" to a
+	unique_xmalloc_ptr.
+	(source_script_with_search): Update.
+	* auto-load.c (source_script_file): Update.
+	* cli/cli-cmds.h (find_and_open_script): Change type.
+
+2017-05-02  Tom Tromey  <tom@tromey.com>
+
 	* xml-support.c (xml_fetch_content_from_file): Update.
 	* ui-file.c (stdio_file::open): Update.
 	* tracefile-tfile.c (tfile_start): Update.
diff --git a/gdb/auto-load.c b/gdb/auto-load.c
index 292f2ae..dc1bb5d 100644
--- a/gdb/auto-load.c
+++ b/gdb/auto-load.c
@@ -928,10 +928,7 @@ source_script_file (struct auto_load_pspace_info *pspace_info,
 		    const char *section_name, unsigned int offset,
 		    const char *file)
 {
-  FILE *stream;
-  char *full_path;
-  int opened, in_hash_table;
-  struct cleanup *cleanups;
+  int opened = 0, in_hash_table;
   objfile_script_sourcer_func *sourcer;
 
   /* Skip this script if support is not compiled in.  */
@@ -953,26 +950,27 @@ source_script_file (struct auto_load_pspace_info *pspace_info,
       return;
     }
 
-  opened = find_and_open_script (file, 1 /*search_path*/,
-				 &stream, &full_path);
+  gdb::unique_xmalloc_ptr<char> full_path;
+  gdb_file_up stream = find_and_open_script (file, 1 /*search_path*/,
+					     &full_path);
+  const char *path_ptr = full_path.get ();
 
-  cleanups = make_cleanup (null_cleanup, NULL);
-  if (opened)
+  if (stream)
     {
-      make_cleanup_fclose (stream);
-      make_cleanup (xfree, full_path);
-
-      if (!file_is_auto_load_safe (full_path,
+      if (!file_is_auto_load_safe (full_path.get (),
 				   _("auto-load: Loading %s script "
 				     "\"%s\" from section \"%s\" of "
 				     "objfile \"%s\".\n"),
-				   ext_lang_name (language), full_path,
+				   ext_lang_name (language),
+				   full_path.get (),
 				   section_name, objfile_name (objfile)))
 	opened = 0;
+      else
+	opened = 1;
     }
   else
     {
-      full_path = NULL;
+      path_ptr = NULL;
 
       /* If one script isn't found it's not uncommon for more to not be
 	 found either.  We don't want to print a message for each script,
@@ -986,14 +984,12 @@ source_script_file (struct auto_load_pspace_info *pspace_info,
 					    section_name, offset);
     }
 
-  in_hash_table = maybe_add_script_file (pspace_info, opened, file, full_path,
+  in_hash_table = maybe_add_script_file (pspace_info, opened, file, path_ptr,
 					 language);
 
   /* If this file is not currently loaded, load it.  */
   if (opened && !in_hash_table)
-    sourcer (language, objfile, stream, full_path);
-
-  do_cleanups (cleanups);
+    sourcer (language, objfile, stream.get (), path_ptr);
 }
 
 /* Subroutine of source_section_scripts to simplify it.
diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index 2a5b128..c75dd16 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -495,17 +495,16 @@ show_script_ext_mode (struct ui_file *file, int from_tty,
 
 /* Try to open SCRIPT_FILE.
    If successful, the full path name is stored in *FULL_PATHP,
-   the stream is stored in *STREAMP, and return 1.
-   The caller is responsible for freeing *FULL_PATHP.
-   If not successful, return 0; errno is set for the last file
+   and the stream is returned.
+   If not successful, return NULL; errno is set for the last file
    we tried to open.
 
    If SEARCH_PATH is non-zero, and the file isn't found in cwd,
    search for it in the source search path.  */
 
-int
+gdb_file_up
 find_and_open_script (const char *script_file, int search_path,
-		      FILE **streamp, char **full_pathp)
+		      gdb::unique_xmalloc_ptr<char> *full_pathp)
 {
   char *file;
   int fd;
@@ -520,8 +519,10 @@ find_and_open_script (const char *script_file, int search_path,
 
   /* Search for and open 'file' on the search path used for source
      files.  Put the full location in *FULL_PATHP.  */
+  char *temp_path;
   fd = openp (source_path, search_flags,
-	      file, O_RDONLY, full_pathp);
+	      file, O_RDONLY, &temp_path);
+  full_pathp->reset (temp_path);
 
   if (fd == -1)
     {
@@ -533,19 +534,16 @@ find_and_open_script (const char *script_file, int search_path,
 
   do_cleanups (old_cleanups);
 
-  *streamp = fdopen (fd, FOPEN_RT);
-  if (*streamp == NULL)
+  FILE *result = fdopen (fd, FOPEN_RT);
+  if (result == NULL)
     {
       int save_errno = errno;
 
       close (fd);
-      if (full_pathp)
-	xfree (*full_pathp);
       errno = save_errno;
-      return 0;
     }
 
-  return 1;
+  return gdb_file_up (result);
 }
 
 /* Load script FILE, which has already been opened as STREAM.
@@ -596,14 +594,13 @@ source_script_from_stream (FILE *stream, const char *file,
 static void
 source_script_with_search (const char *file, int from_tty, int search_path)
 {
-  FILE *stream;
-  char *full_path;
-  struct cleanup *old_cleanups;
 
   if (file == NULL || *file == 0)
     error (_("source command requires file name of file to source."));
 
-  if (!find_and_open_script (file, search_path, &stream, &full_path))
+  gdb::unique_xmalloc_ptr<char> full_path;
+  gdb_file_up stream = find_and_open_script (file, search_path, &full_path);
+  if (!stream)
     {
       /* The script wasn't found, or was otherwise inaccessible.
          If the source command was invoked interactively, throw an
@@ -618,15 +615,13 @@ source_script_with_search (const char *file, int from_tty, int search_path)
 	}
     }
 
-  old_cleanups = make_cleanup (xfree, full_path);
-  make_cleanup_fclose (stream);
   /* The python support reopens the file, so we need to pass full_path here
      in case the file was found on the search path.  It's useful to do this
      anyway so that error messages show the actual file used.  But only do
      this if we (may have) used search_path, as printing the full path in
      errors for the non-search case can be more noise than signal.  */
-  source_script_from_stream (stream, file, search_path ? full_path : file);
-  do_cleanups (old_cleanups);
+  source_script_from_stream (stream.get (), file,
+			     search_path ? full_path.get () : file);
 }
 
 /* Wrapper around source_script_with_search to export it to main.c
diff --git a/gdb/cli/cli-cmds.h b/gdb/cli/cli-cmds.h
index 7ff1fca..6e3b3d9 100644
--- a/gdb/cli/cli-cmds.h
+++ b/gdb/cli/cli-cmds.h
@@ -17,6 +17,8 @@
 #if !defined (CLI_CMDS_H)
 #define CLI_CMDS_H 1
 
+#include "common/filestuff.h"
+
 /* Chain containing all defined commands.  */
 
 extern struct cmd_list_element *cmdlist;
@@ -117,8 +119,9 @@ extern void source_script (const char *, int);
 
 /* Exported to objfiles.c.  */
 
-extern int find_and_open_script (const char *file, int search_path,
-				 FILE **streamp, char **full_path);
+extern gdb_file_up
+    find_and_open_script (const char *file, int search_path,
+			  gdb::unique_xmalloc_ptr<char> *full_path);
 
 /* Command tracing state.  */
 
-- 
2.9.3