bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Rodrigo Morales]

I used the font "Unifont" to reproduce this issue: I downloaded
the font from https://unifoundry.com/unifont/index.html . The file was
called =unifont-15.1.05.bdf.gz=. I decompressed the file using gunzip
and copied the file to ~/.fonts. Afterwards, I executed "fc-cache -f".

To reproduce this issue, I did not start Emacs using "emacs -Q", but I
deleted the file ~/.config/emacs/init.el and I only added the
following sexp to ~/.config/emacs/init.el

#+HEADER: :tangle ~/.config/emacs/init.el
#+BEGIN_SRC elisp
(add-to-list 'default-frame-alist '(font . "Unifont"))
#+END_SRC

I launched Emacs without the =-Q= flag so that the file
~/.config/emacs/init.el . When the Emacs window opened, the modeline
and the sentence "For information about GNU Emacs and the GNU system,
type C-h C-a" which is shown in the minibuffer was shown using
"Unifont" (the C-h C-a was shown using other font).

I pressed C-s and the following error was shown in the minibuffer:

#+BEGIN_SRC text
window-max-chars-per-line: Invalid font name: -GNU-Unifont-medium-normal-normal-Sans-Serif-16-*-*-*-c-80-iso10646-1
#+END_SRC

I enabled =toggle-debug-on-error= and the following was shown in the
buffer *Backtrace*:

#+BEGIN_SRC text
Debugger entered--Lisp error: (error "Invalid font name: -GNU-Unifont-medium-normal-norm...")
  window-font-width(nil nil)
  window-max-chars-per-line()
  isearch-update()
  isearch-mode(t nil nil nil)
  isearch-forward(nil 1)
  funcall-interactively(isearch-forward nil 1)
  command-execute(isearch-forward)
#+END_SRC

In GNU Emacs 29.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41,
cairo version 1.18.0)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Ubuntu 22.04.4 LTS

Configured using:
 'configure
 CONFIG_SHELL=/gnu/store/v9p25q9l5nnaixkhpap5rnymmwbhf9rp-bash-minimal-5.1.16/bin/bash
 SHELL=/gnu/store/v9p25q9l5nnaixkhpap5rnymmwbhf9rp-bash-minimal-5.1.16/bin/bash
 --prefix=/gnu/store/bpalqnfh1y0hy1921lpxx5a6yr6b5ksi-emacs-29.3
 --enable-fast-install --with-cairo --with-modules
 --with-native-compilation=aot --disable-build-details'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3
THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER X11 XDBE XIM XINPUT2 XPM
GTK3 ZLIB

Important settings:
  value of $EMACSLOADPATH: /home/rodrigo/.guix-home/profile/share/emacs/site-lisp:/gnu/store/bpalqnfh1y0hy1921lpxx5a6yr6b5ksi-emacs-29.3/share/emacs/29.3/lisp:/gnu/store/bpalqnfh1y0hy1921lpxx5a6yr6b5ksi-emacs-29.3/share/emacs/29.3/lisp:/gnu/store/bpalqnfh1y0hy1921lpxx5a6yr6b5ksi-emacs-29.3/share/emacs/29.3/lisp
  value of $EMACSNATIVELOADPATH: /home/rodrigo/.guix-home/profile/lib/emacs/native-site-lisp
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  cl-old-struct-compat-mode: 1
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  buffer-read-only: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Eli Zaretskii]

> Date: Thu, 16 May 2024 13:39:26 -0500
> From: Rodrigo Morales <me@rodrigomorales.site>
> 
> 
> I used the font "Unifont" to reproduce this issue: I downloaded
> the font from https://unifoundry.com/unifont/index.html . The file was
> called =unifont-15.1.05.bdf.gz=. I decompressed the file using gunzip
> and copied the file to ~/.fonts. Afterwards, I executed "fc-cache -f".
> 
> To reproduce this issue, I did not start Emacs using "emacs -Q", but I
> deleted the file ~/.config/emacs/init.el and I only added the
> following sexp to ~/.config/emacs/init.el
> 
> #+HEADER: :tangle ~/.config/emacs/init.el
> #+BEGIN_SRC elisp
> (add-to-list 'default-frame-alist '(font . "Unifont"))
> #+END_SRC
> 
> I launched Emacs without the =-Q= flag so that the file
> ~/.config/emacs/init.el . When the Emacs window opened, the modeline
> and the sentence "For information about GNU Emacs and the GNU system,
> type C-h C-a" which is shown in the minibuffer was shown using
> "Unifont" (the C-h C-a was shown using other font).

What does the below show after you start Emacs?

  M-: (face-font 'default) RET

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Rodrigo Morales]

Eli Zaretskii <eliz@gnu.org> writes:

> What does the below show after you start Emacs?
>
>   M-: (face-font 'default) RET

"-GNU-Unifont-medium-normal-normal-Sans-Serif-16-*-*-*-c-80-iso10646-1"

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Eli Zaretskii]

> From: Rodrigo Morales <me@rodrigomorales.site>
> CC: <70989@debbugs.gnu.org>
> Date: Thu, 16 May 2024 15:09:14 -0500
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > What does the below show after you start Emacs?
> >
> >   M-: (face-font 'default) RET
> 
> "-GNU-Unifont-medium-normal-normal-Sans-Serif-16-*-*-*-c-80-iso10646-1"

That "Sans-Serif" part is the problem: it shouldn't have the dash.

Po Lu, any idea where does that get appended to the font's name, and
why?

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Rodrigo Morales <me@rodrigomorales.site>
>> CC: <70989@debbugs.gnu.org>
>> Date: Thu, 16 May 2024 15:09:14 -0500
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > What does the below show after you start Emacs?
>> >
>> >   M-: (face-font 'default) RET
>> 
>> "-GNU-Unifont-medium-normal-normal-Sans-Serif-16-*-*-*-c-80-iso10646-1"
>
> That "Sans-Serif" part is the problem: it shouldn't have the dash.
>
> Po Lu, any idea where does that get appended to the font's name, and
> why?

Rodrigo, would you please let us know which font driver this font is
loaded by?  Please type M-x describe-char RET with point on a character
in the default font, and respond with the output of the Help buffer.

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Rodrigo Morales]

Po Lu <luangruo@yahoo.com> writes:

> Rodrigo, would you please let us know which font driver this font is
> loaded by?  Please type M-x describe-char RET with point on a character
> in the default font, and respond with the output of the Help buffer.

I emptied the file =~/.config/emacs/init.el= and inserted the
following sexp.

#+HEADER: :tangle ~/.config/emacs/init.el
#+BEGIN_SRC elisp
(add-to-list 'default-frame-alist '(font . "Unifont"))
#+END_SRC

I launched emacs without using the =-Q= flag so that
=~/.config/emacs/init.el= is read. I switched to the buffer
=*scratch*= buffer because the buffer =*GNU Emacs*= used other
fonts. See [[http://web.archive.org/web/20240517150825/http://0x0.st/XPqZ.png][this screenshot]] (note that modeline uses =Unifont= but the
buffer =*GNU Emacs*= uses other fonts). The =*scratch*= buffer used
Unifont.

Here's the content of =*Help*= buffer which was opened when I run =M-x
describe-char= in the =;= which is shown as the first character in the
=*scratch*= buffer.

#+BEGIN_SRC text
             position: 1 of 145 (0%), column: 0
            character: ; (displayed as ;) (codepoint 59, #o73, #x3b)
              charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x3B
               script: latin
               syntax: < 	which means: comment
             category: .:Base, a:ASCII, l:Latin, r:Roman
             to input: type "C-x 8 RET 3b" or "C-x 8 RET SEMICOLON"
          buffer code: #x3B
            file code: #x3B (encoded by coding system utf-8-unix)
              display: by this font (glyph code):
    ftcrhb:-GNU-Unifont-medium-normal-normal-Sans-Serif-16-*-*-*-c-80-iso10646-1 (#x3C)

Character code properties: customize what to show
  name: SEMICOLON
  general-category: Po (Punctuation, Other)
  decomposition: (59) (';')

There are text properties here:
  face                 font-lock-comment-delimiter-face
  fontified            t

[back]
#+END_SRC

Feel free to ask for more information if needed.

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Rodrigo Morales <me@rodrigomorales.site> writes:

> #+BEGIN_SRC text
>              position: 1 of 145 (0%), column: 0
>             character: ; (displayed as ;) (codepoint 59, #o73, #x3b)
>               charset: ascii (ASCII (ISO646 IRV))
> code point in charset: 0x3B
>                script: latin
>                syntax: < 	which means: comment
>              category: .:Base, a:ASCII, l:Latin, r:Roman
>              to input: type "C-x 8 RET 3b" or "C-x 8 RET SEMICOLON"
>           buffer code: #x3B
>             file code: #x3B (encoded by coding system utf-8-unix)
>               display: by this font (glyph code):
>     ftcrhb:-GNU-Unifont-medium-normal-normal-Sans-Serif-16-*-*-*-c-80-iso10646-1 (#x3C)

Thanks.  The field in question is the adstyle produced from an
FcPattern's FC_STYLE attribute by get_adstyle_property in the ftfont
driver.  What are the chances that a font will define two adstyles that
collide when dashes (and other characters not representable in an XLFD)
in one are replaced with a substitute?  I expect that they are
negligible, and as such it should suffice to substitute some fixed
alternative for such characters where they appear in adstyles and
perhaps other fields also, if it should ever come to that.

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  <70989@debbugs.gnu.org>
> Date: Sat, 18 May 2024 20:25:06 +0800
> 
> Rodrigo Morales <me@rodrigomorales.site> writes:
> 
> > #+BEGIN_SRC text
> >              position: 1 of 145 (0%), column: 0
> >             character: ; (displayed as ;) (codepoint 59, #o73, #x3b)
> >               charset: ascii (ASCII (ISO646 IRV))
> > code point in charset: 0x3B
> >                script: latin
> >                syntax: < 	which means: comment
> >              category: .:Base, a:ASCII, l:Latin, r:Roman
> >              to input: type "C-x 8 RET 3b" or "C-x 8 RET SEMICOLON"
> >           buffer code: #x3B
> >             file code: #x3B (encoded by coding system utf-8-unix)
> >               display: by this font (glyph code):
> >     ftcrhb:-GNU-Unifont-medium-normal-normal-Sans-Serif-16-*-*-*-c-80-iso10646-1 (#x3C)
> 
> Thanks.  The field in question is the adstyle produced from an
> FcPattern's FC_STYLE attribute by get_adstyle_property in the ftfont
> driver.  What are the chances that a font will define two adstyles that
> collide when dashes (and other characters not representable in an XLFD)
> in one are replaced with a substitute?  I expect that they are
> negligible, and as such it should suffice to substitute some fixed
> alternative for such characters where they appear in adstyles and
> perhaps other fields also, if it should ever come to that.

Sorry, can you elaborate a bit, please?  Specifically:

  . which code in get_adstyle_property does this, and how?
  . what is your idea for a fix, which led you to ask about "the
    chances that a font will define two adstyles that collide"?

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

> Sorry, can you elaborate a bit, please?  Specifically:
>
>   . which code in get_adstyle_property does this, and how?

Not "which code", but "the code", in that the function doesn't actively
generate adstyles inappropriate for XLFDs, but duly returns such
adstyles when Fontconfig reports the same.

>   . what is your idea for a fix, which led you to ask about "the
>     chances that a font will define two adstyles that collide"?

Replacing instances of "-" with "_" in adstyles.

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: me@rodrigomorales.site,  70989@debbugs.gnu.org
> Date: Sun, 19 May 2024 08:15:14 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Sorry, can you elaborate a bit, please?  Specifically:
> >
> >   . which code in get_adstyle_property does this, and how?
> 
> Not "which code", but "the code", in that the function doesn't actively
> generate adstyles inappropriate for XLFDs, but duly returns such
> adstyles when Fontconfig reports the same.

Sorry, I still don't understand what you are saying.  Could you please
talk me through the code in that function, and tell where does
"Sans-Serif" come from and how is it "injected" into the font's
attributes?

What I see there is the call to fond_intern_prop, and if the result is
accepted by font_style_to_value as a valid value of FONT_WIDTH_INDEX,
it is returned.  But "Sans-Serif" is not supposed to be a valid width
of a font, so I'm confused.

> >   . what is your idea for a fix, which led you to ask about "the
> >     chances that a font will define two adstyles that collide"?
> 
> Replacing instances of "-" with "_" in adstyles.

In what string or symbol name that is being processed in
get_adstyle_property?

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

> Sorry, I still don't understand what you are saying.  Could you please
> talk me through the code in that function, and tell where does
> "Sans-Serif" come from and how is it "injected" into the font's
> attributes?
>
> What I see there is the call to fond_intern_prop, and if the result is
> accepted by font_style_to_value as a valid value of FONT_WIDTH_INDEX,
> it is returned.  But "Sans-Serif" is not supposed to be a valid width
> of a font, so I'm confused.

Where does FONT_WIDTH_INDEX come into play?  The attribute responsible
is FONT_ADSTYLE_INDEX, which is set to "Sans-Serif" by:

	 font. */
      FT_Face ft_face;

      ASET (entity, FONT_ADSTYLE_INDEX, get_adstyle_property (p));
      if ((ft_library || FT_Init_FreeType (&ft_library) == 0)

in ftfont_pattern_entity.  The XLFD generated from a font with such an
adstyle is not parsable, the character `-' being the field separator in
XLFDs, and gives rise to parser errors such as Rodrigo encountered when
I-search, by proxy, attempted to deconstruct the XLFD back into a font
spec.

> In what string or symbol name that is being processed in
> get_adstyle_property?

Its return value.

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: me@rodrigomorales.site,  70989@debbugs.gnu.org
> Date: Sun, 19 May 2024 15:37:09 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > What I see there is the call to fond_intern_prop, and if the result is
> > accepted by font_style_to_value as a valid value of FONT_WIDTH_INDEX,
> > it is returned.  But "Sans-Serif" is not supposed to be a valid width
> > of a font, so I'm confused.
> 
> Where does FONT_WIDTH_INDEX come into play?

Inside get_adstyle_property:

  adstyle = font_intern_prop (str, end - str, 1);
  if (font_style_to_value (FONT_WIDTH_INDEX, adstyle, 0) >= 0)
    return Qnil;
  return adstyle;

> The attribute responsible is FONT_ADSTYLE_INDEX, which is set to
> "Sans-Serif" by:
> 
> 	 font. */
>       FT_Face ft_face;
> 
>       ASET (entity, FONT_ADSTYLE_INDEX, get_adstyle_property (p));
>       if ((ft_library || FT_Init_FreeType (&ft_library) == 0)
> 
> in ftfont_pattern_entity.  The XLFD generated from a font with such an
> adstyle is not parsable, the character `-' being the field separator in
> XLFDs, and gives rise to parser errors such as Rodrigo encountered when
> I-search, by proxy, attempted to deconstruct the XLFD back into a font
> spec.

Yes, I understand all that.  That was not my question.

So what is the patch you'd propose.

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Po Lu <luangruo@yahoo.com>
>> Cc: me@rodrigomorales.site,  70989@debbugs.gnu.org
>> Date: Sun, 19 May 2024 15:37:09 +0800
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > What I see there is the call to fond_intern_prop, and if the result is
>> > accepted by font_style_to_value as a valid value of FONT_WIDTH_INDEX,
>> > it is returned.  But "Sans-Serif" is not supposed to be a valid width
>> > of a font, so I'm confused.
>> 
>> Where does FONT_WIDTH_INDEX come into play?
>
> Inside get_adstyle_property:
>
>   adstyle = font_intern_prop (str, end - str, 1);
>   if (font_style_to_value (FONT_WIDTH_INDEX, adstyle, 0) >= 0)
>     return Qnil;
>   return adstyle;

This tests whether the adstyle duplicates information that the pattern
might provide as the font width, since if so, the adstyle is entirely
redundant.  You'll observe that font_style_to_value returning >= 0
indicates that the adstyle is a valid width, and therefore the function
rejects, and does not validate, width values.

>> The attribute responsible is FONT_ADSTYLE_INDEX, which is set to
>> "Sans-Serif" by:
>> 
>> 	 font. */
>>       FT_Face ft_face;
>> 
>>       ASET (entity, FONT_ADSTYLE_INDEX, get_adstyle_property (p));
>>       if ((ft_library || FT_Init_FreeType (&ft_library) == 0)
>> 
>> in ftfont_pattern_entity.  The XLFD generated from a font with such an
>> adstyle is not parsable, the character `-' being the field separator in
>> XLFDs, and gives rise to parser errors such as Rodrigo encountered when
>> I-search, by proxy, attempted to deconstruct the XLFD back into a font
>> spec.
>
> Yes, I understand all that.  That was not my question.
>
> So what is the patch you'd propose.

diff --git a/src/ftfont.c b/src/ftfont.c
index 2e37b62ea35..efb6bf668bb 100644
--- a/src/ftfont.c
+++ b/src/ftfont.c
@@ -149,7 +149,8 @@ matching_prefix (char const *str, ptrdiff_t len, char const *pat)
 get_adstyle_property (FcPattern *p)
 {
   FcChar8 *fcstr;
-  char *str, *end;
+  char *str, *end, *tmp;
+  size_t i;
   Lisp_Object adstyle;
 
 #ifdef FC_FONTFORMAT
@@ -168,7 +169,18 @@ get_adstyle_property (FcPattern *p)
       || matching_prefix (str, end - str, "Oblique")
       || matching_prefix (str, end - str, "Italic"))
     return Qnil;
-  adstyle = font_intern_prop (str, end - str, 1);
+  /* The characters `-', `?', `*', and `"' are not representable in XLFDs
+     and therefore must be replaced by substitutes.  (bug#70989) */
+  USE_SAFE_ALLOCA;
+  tmp = SAFE_ALLOCA (end - str);
+  for (i = 0; i < end - str; ++i)
+    tmp[i] = (str[i] == '-'
+	      ? '_' : ((str[i] != '?'
+			&& str[i] != '*'
+			&& str[i] != '"')
+		       ? str[i] : ' '));
+  adstyle = font_intern_prop (tmp, end - str, 1);
+  SAFE_FREE ();
   if (font_style_to_value (FONT_WIDTH_INDEX, adstyle, 0) >= 0)
     return Qnil;
   return adstyle;

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: me@rodrigomorales.site,  70989@debbugs.gnu.org
> Date: Sun, 19 May 2024 19:13:32 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> From: Po Lu <luangruo@yahoo.com>
> >> Cc: me@rodrigomorales.site,  70989@debbugs.gnu.org
> >> Date: Sun, 19 May 2024 15:37:09 +0800
> >> 
> >> Eli Zaretskii <eliz@gnu.org> writes:
> >> 
> >> > What I see there is the call to fond_intern_prop, and if the result is
> >> > accepted by font_style_to_value as a valid value of FONT_WIDTH_INDEX,
> >> > it is returned.  But "Sans-Serif" is not supposed to be a valid width
> >> > of a font, so I'm confused.
> >> 
> >> Where does FONT_WIDTH_INDEX come into play?
> >
> > Inside get_adstyle_property:
> >
> >   adstyle = font_intern_prop (str, end - str, 1);
> >   if (font_style_to_value (FONT_WIDTH_INDEX, adstyle, 0) >= 0)
> >     return Qnil;
> >   return adstyle;
> 
> This tests whether the adstyle duplicates information that the pattern
> might provide as the font width, since if so, the adstyle is entirely
> redundant.  You'll observe that font_style_to_value returning >= 0
> indicates that the adstyle is a valid width, and therefore the function
> rejects, and does not validate, width values.

Thanks.

> >> The attribute responsible is FONT_ADSTYLE_INDEX, which is set to
> >> "Sans-Serif" by:
> >> 
> >> 	 font. */
> >>       FT_Face ft_face;
> >> 
> >>       ASET (entity, FONT_ADSTYLE_INDEX, get_adstyle_property (p));
> >>       if ((ft_library || FT_Init_FreeType (&ft_library) == 0)
> >> 
> >> in ftfont_pattern_entity.  The XLFD generated from a font with such an
> >> adstyle is not parsable, the character `-' being the field separator in
> >> XLFDs, and gives rise to parser errors such as Rodrigo encountered when
> >> I-search, by proxy, attempted to deconstruct the XLFD back into a font
> >> spec.
> >
> > Yes, I understand all that.  That was not my question.
> >
> > So what is the patch you'd propose.
> 
> diff --git a/src/ftfont.c b/src/ftfont.c
> index 2e37b62ea35..efb6bf668bb 100644
> --- a/src/ftfont.c
> +++ b/src/ftfont.c
> @@ -149,7 +149,8 @@ matching_prefix (char const *str, ptrdiff_t len, char const *pat)
>  get_adstyle_property (FcPattern *p)
>  {
>    FcChar8 *fcstr;
> -  char *str, *end;
> +  char *str, *end, *tmp;
> +  size_t i;
>    Lisp_Object adstyle;
>  
>  #ifdef FC_FONTFORMAT
> @@ -168,7 +169,18 @@ get_adstyle_property (FcPattern *p)
>        || matching_prefix (str, end - str, "Oblique")
>        || matching_prefix (str, end - str, "Italic"))
>      return Qnil;
> -  adstyle = font_intern_prop (str, end - str, 1);
> +  /* The characters `-', `?', `*', and `"' are not representable in XLFDs
> +     and therefore must be replaced by substitutes.  (bug#70989) */
> +  USE_SAFE_ALLOCA;
> +  tmp = SAFE_ALLOCA (end - str);
> +  for (i = 0; i < end - str; ++i)
> +    tmp[i] = (str[i] == '-'
> +	      ? '_' : ((str[i] != '?'
> +			&& str[i] != '*'
> +			&& str[i] != '"')
> +		       ? str[i] : ' '));
> +  adstyle = font_intern_prop (tmp, end - str, 1);
> +  SAFE_FREE ();
>    if (font_style_to_value (FONT_WIDTH_INDEX, adstyle, 0) >= 0)
>      return Qnil;
>    return adstyle;

Thanks, but why not replace all of those with a SPC?  It's simpler, I
think.

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

> Thanks, but why not replace all of those with a SPC?  It's simpler, I
> think.

No reason in particular, I simply thought it would be more elegant to
replace the other special characters with a different placeholder.

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: me@rodrigomorales.site,  70989@debbugs.gnu.org
> Date: Sun, 19 May 2024 21:00:30 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Thanks, but why not replace all of those with a SPC?  It's simpler, I
> > think.
> 
> No reason in particular, I simply thought it would be more elegant to
> replace the other special characters with a different placeholder.

I'd prefer to replace all the characters we cannot use there with a
SPC, for consistency.

Otherwise, I'm okay with the patch; please feel free to install.

bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Po Lu <luangruo@yahoo.com>
>> Cc: me@rodrigomorales.site,  70989@debbugs.gnu.org
>> Date: Sun, 19 May 2024 21:00:30 +0800
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > Thanks, but why not replace all of those with a SPC?  It's simpler, I
>> > think.
>> 
>> No reason in particular, I simply thought it would be more elegant to
>> replace the other special characters with a different placeholder.
>
> I'd prefer to replace all the characters we cannot use there with a
> SPC, for consistency.
>
> Otherwise, I'm okay with the patch; please feel free to install.

Now done.  Rodrigo, please test and ack, and thanks.