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authorAndreas Scherer <andreas_tex@freenet.de>2020-05-04 09:24:50 +0000
committerAndreas Scherer <andreas_tex@freenet.de>2020-05-04 09:24:50 +0000
commit7e856ed3c574392e629b309f939f4306f45255a3 (patch)
tree967d9dd2d00254b3b697e6a2ead7e3e11dfc2c07 /Build/source/texk/web2c/tex.ch
parent124f8f40aba1a7ba62f5498895c0cbd5a47961b3 (diff)
Restore section numbering in TeX.
Move new material from §366 and §526 to the end. Sections with "System-dependent changes" start at §1379 again. Fix xetex.ch for modified/amended material. One change in 'xetex.ch' referred to the modified stuff for §526, now in §1407 (tex.web+tex.ch). git-svn-id: svn://tug.org/texlive/trunk@54999 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/texk/web2c/tex.ch')
-rw-r--r--Build/source/texk/web2c/tex.ch141
1 files changed, 70 insertions, 71 deletions
diff --git a/Build/source/texk/web2c/tex.ch b/Build/source/texk/web2c/tex.ch
index df6866a4385..ec383698fbd 100644
--- a/Build/source/texk/web2c/tex.ch
+++ b/Build/source/texk/web2c/tex.ch
@@ -1493,30 +1493,6 @@ aligning:begin print(" while scanning preamble"); info(p):=right_brace_token+"}"
absorbing:begin print(" while scanning text"); info(p):=right_brace_token+"}";
@z
-@x [25.366] expansion depth check
-The |expand| subroutine is used when |cur_cmd>max_command|. It removes a
-@y
-@ Sometimes, recursive calls to the following |expand| routine may
-cause exhaustion of the run-time calling stack, resulting in
-forced execution stops by the operating system. To diminish the chance
-of this happening, a counter is used to keep track of the recursion
-depth, in conjunction with a constant called |expand_depth|.
-
-This does not catch all possible infinite recursion loops, just the ones
-that exhaust the application calling stack. The actual maximum value of
-|expand_depth| is outside of our control, but the initial setting of
-|10000| should be enough to prevent problems.
-@^system dependencies@>
-
-@<Global...@>=
-expand_depth_count:integer;
-
-@ @<Set init...@>=
-expand_depth_count:=0;
-
-@ The |expand| subroutine is used when |cur_cmd>max_command|. It removes a
-@z
-
@x [25.366]
begin cv_backup:=cur_val; cvl_backup:=cur_val_level; radix_backup:=radix;
@y
@@ -1931,53 +1907,6 @@ end;
done: end_name; name_in_progress:=false;
warning_index := save_warning_index; {restore |warning_index|}
end;
-
-@ When |scan_file_name| starts it looks for a |left_brace|
-(skipping \.{\\relax}es, as other \.{\\toks}-like primitives).
-If a |left_brace| is found, then the procedure scans a file
-name contained in a balanced token list, expanding tokens as
-it goes. When the scanner finds the balanced token list, it
-is converted into a string and fed character-by-character to
-|more_name| to do its job the same as in the ``normal'' file
-name scanning.
-
-@p procedure scan_file_name_braced;
-var
- @!save_scanner_status: small_number; {|scanner_status| upon entry}
- @!save_def_ref: pointer; {|def_ref| upon entry, important if inside `\.{\\message}}
- @!save_cur_cs: pointer;
- @!s: str_number; {temp string}
- @!p: pointer; {temp pointer}
- @!i: integer; {loop tally}
- @!save_stop_at_space: boolean; {this should be in tex.ch}
- @!dummy: boolean;
- {Initialising}
-begin save_scanner_status := scanner_status; {|scan_toks| sets |scanner_status| to |absorbing|}
- save_def_ref := def_ref; {|scan_toks| uses |def_ref| to point to the token list just read}
- save_cur_cs := cur_cs; {we set |cur_cs| back a few tokens to use in runaway errors}
- {Scanning a token list}
- cur_cs := warning_index; {for possible runaway error}
- {mimick |call_func| from pdfTeX}
- if scan_toks(false, true) <> 0 then do_nothing; {actually do the scanning}
- {|s := tokens_to_string(def_ref);|}
- old_setting := selector; selector:=new_string;
- show_token_list(link(def_ref),null,pool_size-pool_ptr);
- selector := old_setting;
- s := make_string;
- {turns the token list read in a string to input}
- {Restoring some variables}
- delete_token_ref(def_ref); {remove the token list from memory}
- def_ref := save_def_ref; {and restore |def_ref|}
- cur_cs := save_cur_cs; {restore |cur_cs|}
- scanner_status := save_scanner_status; {restore |scanner_status|}
- {Passing the read string to the input machinery}
- save_stop_at_space := stop_at_space; {save |stop_at_space|}
- stop_at_space := false; {set |stop_at_space| to false to allow spaces in file names}
- begin_name;
- for i:=str_start[s] to str_start[s+1]-1 do
- dummy := more_name(str_pool[i]); {add each read character to the current file name}
- stop_at_space := save_stop_at_space; {restore |stop_at_space|}
-end;
@z
@x [29.530] l.10245 - prompt_file_name: prevent empty filenames.
@@ -4991,5 +4920,75 @@ begin
get_nullstr := "";
end;
+
+@* \[54/web2c] More changes for Web2c.
+% Related to [25.366] expansion depth check
+Sometimes, recursive calls to the |expand| routine may
+cause exhaustion of the run-time calling stack, resulting in
+forced execution stops by the operating system. To diminish the chance
+of this happening, a counter is used to keep track of the recursion
+depth, in conjunction with a constant called |expand_depth|.
+
+This does not catch all possible infinite recursion loops, just the ones
+that exhaust the application calling stack. The actual maximum value of
+|expand_depth| is outside of our control, but the initial setting of
+|10000| should be enough to prevent problems.
+@^system dependencies@>
+
+@<Global...@>=
+expand_depth_count:integer;
+
+@ @<Set init...@>=
+expand_depth_count:=0;
+
+@ % Related to [29.526] expansion depth check
+When |scan_file_name| starts it looks for a |left_brace|
+(skipping \.{\\relax}es, as other \.{\\toks}-like primitives).
+If a |left_brace| is found, then the procedure scans a file
+name contained in a balanced token list, expanding tokens as
+it goes. When the scanner finds the balanced token list, it
+is converted into a string and fed character-by-character to
+|more_name| to do its job the same as in the ``normal'' file
+name scanning.
+
+@p procedure scan_file_name_braced;
+var
+ @!save_scanner_status: small_number; {|scanner_status| upon entry}
+ @!save_def_ref: pointer; {|def_ref| upon entry, important if inside `\.{\\message}}
+ @!save_cur_cs: pointer;
+ @!s: str_number; {temp string}
+ @!p: pointer; {temp pointer}
+ @!i: integer; {loop tally}
+ @!save_stop_at_space: boolean; {this should be in tex.ch}
+ @!dummy: boolean;
+ {Initialising}
+begin save_scanner_status := scanner_status; {|scan_toks| sets |scanner_status| to |absorbing|}
+ save_def_ref := def_ref; {|scan_toks| uses |def_ref| to point to the token list just read}
+ save_cur_cs := cur_cs; {we set |cur_cs| back a few tokens to use in runaway errors}
+ {Scanning a token list}
+ cur_cs := warning_index; {for possible runaway error}
+ {mimick |call_func| from pdfTeX}
+ if scan_toks(false, true) <> 0 then do_nothing; {actually do the scanning}
+ {|s := tokens_to_string(def_ref);|}
+ old_setting := selector; selector:=new_string;
+ show_token_list(link(def_ref),null,pool_size-pool_ptr);
+ selector := old_setting;
+ s := make_string;
+ {turns the token list read in a string to input}
+ {Restoring some variables}
+ delete_token_ref(def_ref); {remove the token list from memory}
+ def_ref := save_def_ref; {and restore |def_ref|}
+ cur_cs := save_cur_cs; {restore |cur_cs|}
+ scanner_status := save_scanner_status; {restore |scanner_status|}
+ {Passing the read string to the input machinery}
+ save_stop_at_space := stop_at_space; {save |stop_at_space|}
+ stop_at_space := false; {set |stop_at_space| to false to allow spaces in file names}
+ begin_name;
+ for i:=str_start[s] to str_start[s+1]-1 do
+ dummy := more_name(str_pool[i]); {add each read character to the current file name}
+ stop_at_space := save_stop_at_space; {restore |stop_at_space|}
+end;
+
+
@* \[55] Index.
@z