[PATCH v4 3/9] gdbsupport: Let construct_inferior_arguments take gdb::array_view param

[Michael Weghorn <m.weghorn@posteo.de>]

Adapt the construct_inferior_arguments function to
take a gdb::array_view<char * const> parameter instead
of a char * array and an int indicating the length
and adapt the only call site.

This will allow calling it more simply in a follow-up
patch introducing more uses of the function.

gdbsupport/ChangeLog:

2020-05-13  Michael Weghorn  <m.weghorn@posteo.de>

        * common-inferior.cc, common-inferior.h (construct_inferior_arguments):
        Adapt to take a gdb::array_view<char * const> parameter.
        Adapt call site.
---
 gdb/infcmd.c                  |  5 +++--
 gdbsupport/common-inferior.cc | 16 +++++++---------
 gdbsupport/common-inferior.h  |  5 ++++-
 3 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/gdb/infcmd.c b/gdb/infcmd.c
index a7c037837c..14066eaae1 100644
--- a/gdb/infcmd.c
+++ b/gdb/infcmd.c
@@ -151,8 +151,9 @@ get_inferior_args (void)
 {
   if (current_inferior ()->argc != 0)
     {
-      std::string n = construct_inferior_arguments (current_inferior ()->argc,
-					            current_inferior ()->argv);
+      gdb::array_view<char * const> args (current_inferior ()->argv,
+                                          current_inferior ()->argc);
+      std::string n = construct_inferior_arguments (args);
       set_inferior_args (n.c_str ());
     }
 
diff --git a/gdbsupport/common-inferior.cc b/gdbsupport/common-inferior.cc
index aa8be14c74..a67d1740a2 100644
--- a/gdbsupport/common-inferior.cc
+++ b/gdbsupport/common-inferior.cc
@@ -28,10 +28,8 @@ bool startup_with_shell = true;
 /* See common-inferior.h.  */
 
 std::string
-construct_inferior_arguments (int argc, char * const *argv)
+construct_inferior_arguments (gdb::array_view<char * const> argv)
 {
-  gdb_assert (argc >= 0);
-
   std::string result;
 
   if (startup_with_shell)
@@ -48,7 +46,7 @@ construct_inferior_arguments (int argc, char * const *argv)
       static const char special[] = "\"!#$&*()\\|[]{}<>?'`~^; \t\n";
       static const char quote = '\'';
 #endif
-      for (int i = 0; i < argc; ++i)
+      for (int i = 0; i < argv.size (); ++i)
 	{
 	  if (i > 0)
 	    result += ' ';
@@ -103,19 +101,19 @@ construct_inferior_arguments (int argc, char * const *argv)
     {
       /* In this case we can't handle arguments that contain spaces,
 	 tabs, or newlines -- see breakup_args().  */
-      for (int i = 0; i < argc; ++i)
+      for (char *arg : argv)
 	{
-	  char *cp = strchr (argv[i], ' ');
+	  char *cp = strchr (arg, ' ');
 	  if (cp == NULL)
-	    cp = strchr (argv[i], '\t');
+	    cp = strchr (arg, '\t');
 	  if (cp == NULL)
-	    cp = strchr (argv[i], '\n');
+	    cp = strchr (arg, '\n');
 	  if (cp != NULL)
 	    error (_("can't handle command-line "
 		     "argument containing whitespace"));
 	}
 
-      for (int i = 0; i < argc; ++i)
+      for (int i = 0; i < argv.size (); ++i)
 	{
 	  if (i > 0)
 	    result += " ";
diff --git a/gdbsupport/common-inferior.h b/gdbsupport/common-inferior.h
index 5e9fc8b0b9..4362934cef 100644
--- a/gdbsupport/common-inferior.h
+++ b/gdbsupport/common-inferior.h
@@ -21,6 +21,8 @@
 #ifndef COMMON_COMMON_INFERIOR_H
 #define COMMON_COMMON_INFERIOR_H
 
+#include "gdbsupport/array-view.h"
+
 /* Return the exec wrapper to be used when starting the inferior, or NULL
    otherwise.  */
 extern const char *get_exec_wrapper ();
@@ -60,6 +62,7 @@ extern bool startup_with_shell;
 
 /* Compute command-line string given argument vector. This does the
    same shell processing as fork_inferior.  */
-extern std::string construct_inferior_arguments (int, char * const *);
+extern std::string
+construct_inferior_arguments (gdb::array_view<char * const>);
 
 #endif /* COMMON_COMMON_INFERIOR_H */
-- 
2.26.2