Make xml_escape_text return an std::string

This is a simple replacement, it allows removing some manual free'ing in
the callers.

gdb/ChangeLog:

	* common/buffer.c (buffer_xml_printf): Adjust.
	* common/xml-utils.c (xml_escape_text): Change return type to
	std::string, update code accordingly.
	* common/xml-utils.h (xml_escape_text): Change return type to
	std::string.
	* rs6000-aix-tdep.c (rs6000_aix_shared_library_to_xml): Adjust.
	* windows-tdep.c (windows_xfer_shared_library): Adjust.
	* unittests/xml-utils-selftests.c (test_xml_escape_text):
	Adjust.

gdb/gdbserver/ChangeLog:

	* linux-low.c (linux_qxfer_libraries_svr4): Adjust to change of
	return type of xml_escape_text.
	* server.c (emit_dll_description): Likewise.

10 files changed, 43 insertions, 66 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 21c3694..7d2fb49 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,17 @@
 2017-09-16  Simon Marchi  <simon.marchi@ericsson.com>
 
+	* common/buffer.c (buffer_xml_printf): Adjust.
+	* common/xml-utils.c (xml_escape_text): Change return type to
+	std::string, update code accordingly.
+	* common/xml-utils.h (xml_escape_text): Change return type to
+	std::string.
+	* rs6000-aix-tdep.c (rs6000_aix_shared_library_to_xml): Adjust.
+	* windows-tdep.c (windows_xfer_shared_library): Adjust.
+	* unittests/xml-utils-selftests.c (test_xml_escape_text):
+	Adjust.
+
+2017-09-16  Simon Marchi  <simon.marchi@ericsson.com>
+
 	* Makefile.in (SUBDIR_UNITTESTS_SRCS): Add new source file.
 	(SUBDIR_UNITTESTS_OBS): Add new object file.
 	* unittests/xml-utils-selftests.c: New file.
diff --git a/gdb/common/buffer.c b/gdb/common/buffer.c
index c5eb169..70d91e6 100644
--- a/gdb/common/buffer.c
+++ b/gdb/common/buffer.c
@@ -88,7 +88,6 @@ buffer_xml_printf (struct buffer *buffer, const char *format, ...)
       if (percent)
 	{
 	  char buf[32];
-	  char *p;
 	  char *str = buf;
 	  const char *f_old = f;
 	  
@@ -163,9 +162,8 @@ buffer_xml_printf (struct buffer *buffer, const char *format, ...)
 	  if (str)
 	    {
 	      buffer_grow (buffer, prev, f_old - prev - 1);
-	      p = xml_escape_text (str);
-	      buffer_grow_str (buffer, p);
-	      xfree (p);
+	      std::string p = xml_escape_text (str);
+	      buffer_grow_str (buffer, p.c_str ());
 	      prev = f + 1;
 	    }
 	  percent = 0;
diff --git a/gdb/common/xml-utils.c b/gdb/common/xml-utils.c
index b5fe442..c6dd2fb 100644
--- a/gdb/common/xml-utils.c
+++ b/gdb/common/xml-utils.c
@@ -20,64 +20,37 @@
 #include "common-defs.h"
 #include "xml-utils.h"
 
-/* Return a malloc allocated string with special characters from TEXT
-   replaced by entity references.  */
+/* Return a string with special characters from TEXT replaced by entity
+   references.  */
 
-char *
+std::string
 xml_escape_text (const char *text)
 {
-  char *result;
-  int i, special;
-
-  /* Compute the length of the result.  */
-  for (i = 0, special = 0; text[i] != '\0'; i++)
-    switch (text[i])
-      {
-      case '\'':
-      case '\"':
-	special += 5;
-	break;
-      case '&':
-	special += 4;
-	break;
-      case '<':
-      case '>':
-	special += 3;
-	break;
-      default:
-	break;
-      }
+  std::string result;
 
   /* Expand the result.  */
-  result = (char *) xmalloc (i + special + 1);
-  for (i = 0, special = 0; text[i] != '\0'; i++)
+  for (int i = 0; text[i] != '\0'; i++)
     switch (text[i])
       {
       case '\'':
-	strcpy (result + i + special, "&apos;");
-	special += 5;
+	result += "&apos;";
 	break;
       case '\"':
-	strcpy (result + i + special, "&quot;");
-	special += 5;
+	result += "&quot;";
 	break;
       case '&':
-	strcpy (result + i + special, "&amp;");
-	special += 4;
+	result += "&amp;";
 	break;
       case '<':
-	strcpy (result + i + special, "&lt;");
-	special += 3;
+	result += "&lt;";
 	break;
       case '>':
-	strcpy (result + i + special, "&gt;");
-	special += 3;
+	result += "&gt;";
 	break;
       default:
-	result[i + special] = text[i];
+	result += text[i];
 	break;
       }
-  result[i + special] = '\0';
 
   return result;
 }
diff --git a/gdb/common/xml-utils.h b/gdb/common/xml-utils.h
index d138bab..f69f5f5 100644
--- a/gdb/common/xml-utils.h
+++ b/gdb/common/xml-utils.h
@@ -23,6 +23,6 @@
 /* Return a malloc allocated string with special characters from TEXT
    replaced by entity references.  */
 
-extern char *xml_escape_text (const char *text);
+extern std::string xml_escape_text (const char *text);
 
 #endif
diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 61b2e06..49a76c9 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,5 +1,11 @@
 2017-09-16  Simon Marchi  <simon.marchi@ericsson.com>
 
+	* linux-low.c (linux_qxfer_libraries_svr4): Adjust to change of
+	return type of xml_escape_text.
+	* server.c (emit_dll_description): Likewise.
+
+2017-09-16  Simon Marchi  <simon.marchi@ericsson.com>
+
 	* server.c (captured_main): Accept argument for --selftest.
 	Update run_tests call.
 	* linux-x86-tdesc-selftest.c (initialize_low_tdesc): Add names
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index 1d96ec2..1bc8f38 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -7288,7 +7288,6 @@ linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf,
 	    {
 	      /* 6x the size for xml_escape_text below.  */
 	      size_t len = 6 * strlen ((char *) libname);
-	      char *name;
 
 	      if (!header_done)
 		{
@@ -7307,12 +7306,11 @@ linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf,
 		  p = document + document_len;
 		}
 
-	      name = xml_escape_text ((char *) libname);
+	      std::string name = xml_escape_text ((char *) libname);
 	      p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" "
 			    "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
-			    name, (unsigned long) lm_addr,
+			    name.c_str (), (unsigned long) lm_addr,
 			    (unsigned long) l_addr, (unsigned long) l_ld);
-	      free (name);
 	    }
 	}
 
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index 99dedb2..92943e2 100644
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -1532,13 +1532,11 @@ emit_dll_description (struct inferior_list_entry *inf, void *arg)
   struct dll_info *dll = (struct dll_info *) inf;
   char **p_ptr = (char **) arg;
   char *p = *p_ptr;
-  char *name;
 
   strcpy (p, "  <library name=\"");
   p = p + strlen (p);
-  name = xml_escape_text (dll->name);
-  strcpy (p, name);
-  free (name);
+  std::string name = xml_escape_text (dll->name);
+  strcpy (p, name.c_str ());
   p = p + strlen (p);
   strcpy (p, "\"><segment address=\"");
   p = p + strlen (p);
diff --git a/gdb/rs6000-aix-tdep.c b/gdb/rs6000-aix-tdep.c
index f4f3eb7..fc37d6c 100644
--- a/gdb/rs6000-aix-tdep.c
+++ b/gdb/rs6000-aix-tdep.c
@@ -908,20 +908,16 @@ static void
 rs6000_aix_shared_library_to_xml (struct ld_info *ldi,
 				  struct obstack *obstack)
 {
-  char *p;
-
   obstack_grow_str (obstack, "<library name=\"");
-  p = xml_escape_text (ldi->filename);
-  obstack_grow_str (obstack, p);
-  xfree (p);
+  std::string p = xml_escape_text (ldi->filename);
+  obstack_grow_str (obstack, p.c_str ());
   obstack_grow_str (obstack, "\"");
 
   if (ldi->member_name[0] != '\0')
     {
       obstack_grow_str (obstack, " member=\"");
       p = xml_escape_text (ldi->member_name);
-      obstack_grow_str (obstack, p);
-      xfree (p);
+      obstack_grow_str (obstack, p.c_str ());
       obstack_grow_str (obstack, "\"");
     }
 
diff --git a/gdb/unittests/xml-utils-selftests.c b/gdb/unittests/xml-utils-selftests.c
index 21b506a..e4ab483 100644
--- a/gdb/unittests/xml-utils-selftests.c
+++ b/gdb/unittests/xml-utils-selftests.c
@@ -28,11 +28,9 @@ static void test_xml_escape_text ()
 {
   const char *input = "<this isn't=\"xml\"> &";
   const char *expected_output = "&lt;this isn&apos;t=&quot;xml&quot;&gt; &amp;";
-  char *actual_output = xml_escape_text (input);
+  std::string actual_output = xml_escape_text (input);
 
-  SELF_CHECK (strcmp (actual_output, expected_output) == 0);
-
-  xfree (actual_output);
+  SELF_CHECK (actual_output == expected_output);
 }
 
 }
diff --git a/gdb/windows-tdep.c b/gdb/windows-tdep.c
index 886c4ec..197d779 100644
--- a/gdb/windows-tdep.c
+++ b/gdb/windows-tdep.c
@@ -371,13 +371,11 @@ void
 windows_xfer_shared_library (const char* so_name, CORE_ADDR load_addr,
 			     struct gdbarch *gdbarch, struct obstack *obstack)
 {
-  char *p;
   CORE_ADDR text_offset;
 
   obstack_grow_str (obstack, "<library name=\"");
-  p = xml_escape_text (so_name);
-  obstack_grow_str (obstack, p);
-  xfree (p);
+  std::string p = xml_escape_text (so_name);
+  obstack_grow_str (obstack, p.c_str ());
   obstack_grow_str (obstack, "\"><segment address=\"");
   gdb_bfd_ref_ptr dll (gdb_bfd_open (so_name, gnutarget, -1));
   /* The following calls are OK even if dll is NULL.