Avoid calls to strlen in font processing functions.

* font.c (font_parse_name, font_parse_xlfd, font_parse_fcname)
(font_open_by_name): Changed to use length argument.  Adjust
users accordingly.
* font.h (font_open_by_name, font_parse_xlfd): Adjust prototypes.
* xfont.c (xfont_decode_coding_xlfd): Changed to return ptrdiff_t.
(xfont_list_pattern, xfont_match): Use length returned by
xfont_decode_coding_xlfd.
* xfns.c (x_default_font_parameter): Omit useless xstrdup.

8 files changed, 39 insertions, 31 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 244ba0148ca..ed98c47d1cb 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,15 @@
+2012-07-11  Dmitry Antipov  <dmantipov@yandex.ru>
+
+        Avoid calls to strlen in font processing functions.
+        * font.c (font_parse_name, font_parse_xlfd, font_parse_fcname)
+        (font_open_by_name): Changed to use length argument.  Adjust
+        users accordingly.
+        * font.h (font_open_by_name, font_parse_xlfd): Adjust prototypes.
+        * xfont.c (xfont_decode_coding_xlfd): Changed to return ptrdiff_t.
+        (xfont_list_pattern, xfont_match): Use length returned by
+        xfont_decode_coding_xlfd.
+        * xfns.c (x_default_font_parameter): Omit useless xstrdup.
+
 2012-07-11  Glenn Morris  <rgm@gnu.org>
 
         * s/darwin.h, s/freebsd.h, s/netbsd.h:
diff --git a/src/font.c b/src/font.c
index ea6fc47884c..27abbe25786 100644
--- a/src/font.c
+++ b/src/font.c
@@ -739,7 +739,7 @@ font_put_extra (Lisp_Object font, Lisp_Object prop, Lisp_Object val)
 
 static int parse_matrix (const char *);
 static int font_expand_wildcards (Lisp_Object *, int);
-static int font_parse_name (char *, Lisp_Object);
+static int font_parse_name (char *, ptrdiff_t, Lisp_Object);
 
 /* An enumerator for each field of an XLFD font name.  */
 enum xlfd_field_index
@@ -1019,9 +1019,8 @@ font_expand_wildcards (Lisp_Object *field, int n)
    a fully specified XLFD.  */
 
 int
-font_parse_xlfd (char *name, Lisp_Object font)
+font_parse_xlfd (char *name, ptrdiff_t len, Lisp_Object font)
 {
-  ptrdiff_t len = strlen (name);
   int i, j, n;
   char *f[XLFD_LAST_INDEX + 1];
   Lisp_Object val;
@@ -1336,12 +1335,11 @@ font_unparse_xlfd (Lisp_Object font, int pixel_size, char *name, int nbytes)
    This function tries to guess which format it is.  */
 
 static int
-font_parse_fcname (char *name, Lisp_Object font)
+font_parse_fcname (char *name, ptrdiff_t len, Lisp_Object font)
 {
   char *p, *q;
   char *size_beg = NULL, *size_end = NULL;
   char *props_beg = NULL, *family_end = NULL;
-  ptrdiff_t len = strlen (name);
 
   if (len == 0)
     return -1;
@@ -1694,11 +1692,11 @@ font_unparse_fcname (Lisp_Object font, int pixel_size, char *name, int nbytes)
    0.  Otherwise return -1.  */
 
 static int
-font_parse_name (char *name, Lisp_Object font)
+font_parse_name (char *name, ptrdiff_t namelen, Lisp_Object font)
 {
   if (name[0] == '-' || strchr (name, '*') || strchr (name, '?'))
-    return font_parse_xlfd (name, font);
-  return font_parse_fcname (name, font);
+    return font_parse_xlfd (name, namelen, font);
+  return font_parse_fcname (name, namelen, font);
 }
 
 
@@ -2987,7 +2985,7 @@ font_spec_from_name (Lisp_Object font_name)
   Lisp_Object spec = Ffont_spec (0, NULL);
 
   CHECK_STRING (font_name);
-  if (font_parse_name (SSDATA (font_name), spec) == -1)
+  if (font_parse_name (SSDATA (font_name), SBYTES (font_name), spec) == -1)
     return Qnil;
   font_put_extra (spec, QCname, font_name);
   font_put_extra (spec, QCuser_spec, font_name);
@@ -3359,13 +3357,13 @@ font_open_by_spec (FRAME_PTR f, Lisp_Object spec)
    found, return Qnil.  */
 
 Lisp_Object
-font_open_by_name (FRAME_PTR f, const char *name)
+font_open_by_name (FRAME_PTR f, const char *name, ptrdiff_t len)
 {
   Lisp_Object args[2];
   Lisp_Object spec, ret;
 
   args[0] = QCname;
-  args[1] = make_unibyte_string (name, strlen (name));
+  args[1] = make_unibyte_string (name, len);
   spec = Ffont_spec (2, args);
   ret = font_open_by_spec (f, spec);
   /* Do not lose name originally put in.  */
@@ -3872,7 +3870,7 @@ usage: (font-spec ARGS...)  */)
       if (EQ (key, QCname))
         {
           CHECK_STRING (val);
-          font_parse_name (SSDATA (val), spec);
+          font_parse_name (SSDATA (val), SBYTES (val), spec);
           font_put_extra (spec, key, val);
         }
       else
@@ -4887,7 +4885,7 @@ If the named font is not yet loaded, return nil.  */)
 
       if (fontset >= 0)
         name = fontset_ascii (fontset);
-      font_object = font_open_by_name (f, SSDATA (name));
+      font_object = font_open_by_name (f, SSDATA (name), SBYTES (name));
     }
   else if (FONT_OBJECT_P (name))
     font_object = name;
diff --git a/src/font.h b/src/font.h
index adb2566327c..11329daa6e7 100644
--- a/src/font.h
+++ b/src/font.h
@@ -771,7 +771,7 @@ extern void font_prepare_for_face (FRAME_PTR f, struct face *face);
 extern void font_done_for_face (FRAME_PTR f, struct face *face);
 
 extern Lisp_Object font_open_by_spec (FRAME_PTR f, Lisp_Object spec);
-extern Lisp_Object font_open_by_name (FRAME_PTR f, const char *name);
+extern Lisp_Object font_open_by_name (FRAME_PTR f, const char *name, ptrdiff_t len);
 
 extern Lisp_Object font_intern_prop (const char *str, ptrdiff_t len,
                                      int force_symbol);
@@ -781,7 +781,7 @@ extern void font_parse_family_registry (Lisp_Object family,
                                         Lisp_Object registry,
                                         Lisp_Object spec);
 
-extern int font_parse_xlfd (char *name, Lisp_Object font);
+extern int font_parse_xlfd (char *name, ptrdiff_t len, Lisp_Object font);
 extern int font_unparse_xlfd (Lisp_Object font, int pixel_size,
                               char *name, int bytes);
 extern int font_unparse_fcname (Lisp_Object font, int pixel_size,
diff --git a/src/fontset.c b/src/fontset.c
index 056ef31e4f1..3397502a2fd 100644
--- a/src/fontset.c
+++ b/src/fontset.c
@@ -1646,7 +1646,7 @@ FONT-SPEC is a vector, a cons, or a string.  See the documentation of
       char xlfd[256];
       int len;
 
-      if (font_parse_xlfd (SSDATA (name), font_spec) < 0)
+      if (font_parse_xlfd (SSDATA (name), SBYTES (name), font_spec) < 0)
         error ("Fontset name must be in XLFD format");
       short_name = AREF (font_spec, FONT_REGISTRY_INDEX);
       if (strncmp (SSDATA (SYMBOL_NAME (short_name)), "fontset-", 8)
diff --git a/src/frame.c b/src/frame.c
index 8d7981777bf..8f4bdc84a31 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -3167,7 +3167,7 @@ x_set_font (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
       fontset = fs_query_fontset (arg, 0);
       if (fontset < 0)
         {
-          font_object = font_open_by_name (f, SSDATA (arg));
+          font_object = font_open_by_name (f, SSDATA (arg), SBYTES (arg));
           if (NILP (font_object))
             error ("Font `%s' is not defined", SSDATA (arg));
           arg = AREF (font_object, FONT_NAME_INDEX);
@@ -3176,7 +3176,7 @@ x_set_font (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
         {
           Lisp_Object ascii_font = fontset_ascii (fontset);
 
-          font_object = font_open_by_name (f, SSDATA (ascii_font));
+          font_object = font_open_by_name (f, SSDATA (ascii_font), SBYTES (ascii_font));
           if (NILP (font_object))
             error ("Font `%s' is not defined", SDATA (arg));
           arg = AREF (font_object, FONT_NAME_INDEX);
diff --git a/src/w32fns.c b/src/w32fns.c
index 825f9815482..dac83ab6ae1 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -4036,7 +4036,7 @@ x_default_font_parameter (struct frame *f, Lisp_Object parms)
 
       for (i = 0; names[i]; i++)
         {
-          font = font_open_by_name (f, names[i]);
+          font = font_open_by_name (f, names[i], strlen (names[i]));
           if (! NILP (font))
             break;
         }
diff --git a/src/xfns.c b/src/xfns.c
index ad3fff85f30..a0229919aa0 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -2956,11 +2956,7 @@ x_default_font_parameter (struct frame *f, Lisp_Object parms)
          read yet.  */
       const char *system_font = xsettings_get_system_font ();
       if (system_font)
-        {
-          char *name = xstrdup (system_font);
-          font = font_open_by_name (f, name);
-          xfree (name);
-        }
+        font = font_open_by_name (f, system_font, strlen (system_font));
     }
 
   if (NILP (font))
@@ -2990,7 +2986,7 @@ x_default_font_parameter (struct frame *f, Lisp_Object parms)
 
       for (i = 0; names[i]; i++)
         {
-          font = font_open_by_name (f, names[i]);
+          font = font_open_by_name (f, names[i], strlen (names[i]));
           if (! NILP (font))
             break;
         }
diff --git a/src/xfont.c b/src/xfont.c
index b7a1e06199e..2ba7941c9cb 100644
--- a/src/xfont.c
+++ b/src/xfont.c
@@ -174,7 +174,7 @@ compare_font_names (const void *name1, const void *name2)
    XLFD is NULL terminated.  The caller must assure that OUTPUT is at
    least twice (plus 1) as large as XLFD.  */
 
-static int
+static ptrdiff_t
 xfont_decode_coding_xlfd (char *xlfd, int len, char *output)
 {
   char *p0 = xlfd, *p1 = output;
@@ -397,13 +397,14 @@ xfont_list_pattern (Display *display, const char *pattern,
 
       for (i = 0; i < num_fonts; i++)
         {
+          ptrdiff_t len;
           Lisp_Object entity;
 
           if (i > 0 && xstrcasecmp (indices[i - 1], indices[i]) == 0)
             continue;
           entity = font_make_entity ();
-          xfont_decode_coding_xlfd (indices[i], -1, buf);
-          if (font_parse_xlfd (buf, entity) < 0)
+          len = xfont_decode_coding_xlfd (indices[i], -1, buf);
+          if (font_parse_xlfd (buf, len, entity) < 0)
             continue;
           ASET (entity, FONT_TYPE_INDEX, Qx);
           /* Avoid auto-scaled fonts.  */
@@ -604,10 +605,11 @@ xfont_match (Lisp_Object frame, Lisp_Object spec)
              string.  We must avoid such a name.  */
           if (*s)
             {
+              ptrdiff_t len;
               entity = font_make_entity ();
               ASET (entity, FONT_TYPE_INDEX, Qx);
-              xfont_decode_coding_xlfd (s, -1, name);
-              if (font_parse_xlfd (name, entity) < 0)
+              len = xfont_decode_coding_xlfd (s, -1, name);
+              if (font_parse_xlfd (name, len, entity) < 0)
                 entity = Qnil;
             }
           XFree (s);
@@ -796,7 +798,7 @@ xfont_open (FRAME_PTR f, Lisp_Object entity, int pixel_size)
   ASET (font_object, FONT_TYPE_INDEX, Qx);
   if (STRINGP (fullname))
     {
-      font_parse_xlfd (SSDATA (fullname), font_object);
+      font_parse_xlfd (SSDATA (fullname), SBYTES (fullname), font_object);
       ASET (font_object, FONT_NAME_INDEX, fullname);
     }
   else