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+% $Id$
+% Public domain. See ../pdftexdir/char-warning-pdftex.ch for basic info.
+% In addition to the basic change, we also define a new procedure
+% print_ucs_code to print in the format U+.... for system fonts.
+%
+% To test:
+% xetex -ini
+% \font\x=/usr/local/texlive/2020/texmf-dist/fonts/tfm/public/knuth-lib/logo10.tfm
+% \tracinglostchars=3 \x \char99\end
+% should get:
+% ! Missing character: There is no c ("63) in font logo10.
+% And:
+% \font\y="Nimbus Mono" \tracinglostchars=3 \y \char43981\end
+% should get:
+% ! Missing character: There is no ꯍ (U+ABCD) in font Nimbus Mono Regular!.
+% Assuming that font is findable as a system font, e.g., shown by
+% fc-list :scalable=true family
+
+@x [30] If \tracinglostchars > 2, then promote to full error.
+procedure char_warning(@!f:internal_font_number;@!c:integer);
+var old_setting: integer; {saved value of |tracing_online|}
+begin if tracing_lost_chars>0 then
+ begin old_setting:=tracing_online;
+ if eTeX_ex and(tracing_lost_chars>1) then tracing_online:=1;
+ begin begin_diagnostic;
+ print_nl("Missing character: There is no ");
+@.Missing character@>
+ if c < @"10000 then print_ASCII(c)
+ else print_char(c); {non-Plane 0 Unicodes can't be sent through |print_ASCII|}
+ print(" in font ");
+ slow_print(font_name[f]); print_char("!"); end_diagnostic(false);
+ end;
+ tracing_online:=old_setting;
+ end;
+end;
+@y
+procedure print_ucs_code(@!n: UnicodeScalar); { cf.~|print_hex| }
+ var k: 0..22; {index to current digit; we assume that $0\L n<16^{22}$}
+ begin
+ k := 0;
+ print("U+"); { prefix with U+ instead of " }
+ repeat
+ dig[k] := n mod 16;
+ n := n div 16;
+ incr(k);
+ until n = 0;
+ { pad to at least 4 hex digits }
+ while k < 4 do
+ begin
+ dig[k] := 0;
+ incr(k);
+ end;
+ print_the_digs(k);
+end;
+
+procedure char_warning(@!f:internal_font_number;@!c:integer);
+var old_setting: integer; {saved value of |tracing_online|}
+begin if tracing_lost_chars>0 then
+ begin old_setting:=tracing_online;
+ if eTeX_ex and(tracing_lost_chars>1) then tracing_online:=1;
+ if tracing_lost_chars > 2 then
+ print_err("Missing character: There is no ")
+ else begin
+ begin_diagnostic;
+ print_nl("Missing character: There is no ")
+ end;
+@.Missing character@>
+ if c < @"10000 then print_ASCII(c)
+ else print_char(c); {non-Plane 0 Unicodes can't be sent through |print_ASCII|}
+ print(" (");
+ if is_native_font(f) then print_ucs_code(c)
+ else print_hex(c);
+ print(")");
+ print(" in font ");
+ slow_print(font_name[f]);
+ if tracing_lost_chars < 3 then print_char("!");
+ tracing_online:=old_setting;
+ if tracing_lost_chars > 2 then begin
+ help0;
+ error;
+ end else end_diagnostic(false);
+ end; {of |tracing_lost_chars>0|}
+end; {of procedure}
+@z