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+Changes for CWEAVE for MSDOS and Borland C++ 3.1 using the following
+options (and perhaps others):
+
+ -mc -w-pro -Ff=5000 -Z- -O-p
+
+The options -Z- and -O-p explicitly turn off optimizations that break
+the code. (See makefile.bs.)
+
+The main purpose of these changes is to support MSDOS with full-size arrays
+by using "huge" pointers.
+
+This file contributed by Barry Schwartz, trashman@crud.mn.org, 28 Jun 94.
+(Includes workaround for compiler bug [pointers wrapping around at
+ segment boundaries], November 1993, contributed by Jorge Fernandez Arnaiz
+ -- arnaiz@redvax1.dgsca.unam.mx)
+(Last revised 5 Dec 94 with help of bob@microprograms.com.)
+
+
+@x Section 1.
+The ``banner line'' defined here should be changed whenever \.{CWEAVE}
+is modified.
+
+@d banner "This is CWEAVE (Version 3.64)\n"
+@y
+The ``banner line'' defined here should be changed whenever \.{CWEAVE}
+is modified.
+
+@d banner "This is CWEAVE (Version 3.64pc/big)\n"
+@z
+
+
+@x Section 9.
+@d chunk_marker 0
+
+@<Common code...@>=
+typedef struct name_info {
+ char *byte_start; /* beginning of the name in |byte_mem| */
+ struct name_info *link;
+ union {
+ struct name_info *Rlink; /* right link in binary search tree for section
+ names */
+ char Ilk; /* used by identifiers in \.{CWEAVE} only */
+ } dummy;
+ char *equiv_or_xref; /* info corresponding to names */
+} name_info; /* contains information about an identifier or section name */
+typedef name_info *name_pointer; /* pointer into array of \&{name\_info}s */
+typedef name_pointer *hash_pointer;
+extern char byte_mem[]; /* characters of names */
+extern char *byte_mem_end; /* end of |byte_mem| */
+extern name_info name_dir[]; /* information about names */
+extern name_pointer name_dir_end; /* end of |name_dir| */
+extern name_pointer name_ptr; /* first unused position in |name_dir| */
+extern char *byte_ptr; /* first unused position in |byte_mem| */
+extern name_pointer hash[]; /* heads of hash lists */
+extern hash_pointer hash_end; /* end of |hash| */
+extern hash_pointer h; /* index into hash-head array */
+extern name_pointer id_lookup(); /* looks up a string in the identifier table */
+extern name_pointer section_lookup(); /* finds section name */
+extern void print_section_name(), sprint_section_name();
+@y
+@d chunk_marker 0
+
+@f huge extern
+
+@<Common code...@>=
+typedef struct name_info {
+ char huge* byte_start; /* beginning of the name in |byte_mem| */
+ struct name_info *link;
+ union {
+ struct name_info *Rlink; /* right link in binary search tree for section
+ names */
+ char Ilk; /* used by identifiers in \.{CWEAVE} only */
+ } dummy;
+ union {
+ char *equiv_member;
+ char huge* xref_member;
+ } ptr_union; /* info corresponding to names */
+} name_info; /* contains information about an identifier or section name */
+typedef name_info *name_pointer; /* pointer into array of \&{name\_info}s */
+typedef name_pointer *hash_pointer;
+extern char huge byte_mem[]; /* characters of names */
+extern char huge* byte_mem_end; /* end of |byte_mem| */
+extern name_info name_dir[]; /* information about names */
+extern name_pointer name_dir_end; /* end of |name_dir| */
+extern name_pointer name_ptr; /* first unused position in |name_dir| */
+extern char huge* byte_ptr; /* first unused position in |byte_mem| */
+extern name_pointer hash[]; /* heads of hash lists */
+extern hash_pointer hash_end; /* end of |hash| */
+extern hash_pointer h; /* index into hash-head array */
+extern name_pointer id_lookup(); /* looks up a string in the identifier table */
+extern name_pointer section_lookup(); /* finds section name */
+extern void print_section_name(), sprint_section_name();
+@z
+
+
+@x Section 18.
+typedef struct xref_info {
+ sixteen_bits num; /* section number plus zero or |def_flag| */
+ struct xref_info *xlink; /* pointer to the previous cross-reference */
+} xref_info;
+typedef xref_info *xref_pointer;
+@y
+typedef struct xref_info {
+ sixteen_bits num; /* section number plus zero or |def_flag| */
+ struct xref_info huge* xlink; /* pointer to the previous cross-reference */
+} xref_info;
+typedef xref_info huge* xref_pointer;
+@z
+
+
+@x Section 19.
+xref_info xmem[max_refs]; /* contains cross-reference information */
+xref_pointer xmem_end = xmem+max_refs-1;
+@y
+xref_info huge xmem[max_refs]; /* contains cross-reference information */
+xref_pointer xmem_end;
+@z
+
+
+@x Section 20.
+@d xref equiv_or_xref
+@y
+@d xref ptr_union.xref_member
+@z
+
+
+@x Section 20.
+xref_ptr=xmem; name_dir->xref=(char*)xmem; xref_switch=0; section_xref_switch=0;
+xmem->num=0; /* sentinel value */
+@y
+xmem_end = xmem + max_refs - 1;
+xref_ptr=xmem; name_dir->xref=(char*)xmem; xref_switch=0; section_xref_switch=0;
+xmem->num=0; /* sentinel value */
+@z
+
+
+@x Section 21.
+ append_xref(m); xref_ptr->xlink=q; p->xref=(char*)xref_ptr;
+@y
+ append_xref(m); xref_ptr->xlink=q; p->xref=(char huge*)xref_ptr;
+@z
+
+
+@x Section 22.
+ if (r==xmem) p->xref=(char*)xref_ptr;
+@y
+ if (r==xmem) p->xref=(char huge*)xref_ptr;
+@z
+
+
+@x Section 23.
+ q=(xref_pointer)p->xref;
+ if (q->num==file_flag) return;
+ append_xref(file_flag);
+ xref_ptr->xlink = q;
+ p->xref = (char *)xref_ptr;
+@y
+ q=(xref_pointer)p->xref;
+ if (q->num==file_flag) return;
+ append_xref(file_flag);
+ xref_ptr->xlink = q;
+ p->xref = (char huge*)xref_ptr;
+@z
+
+@x Section 25. (to please Borland's C++, version 4.02)
+token tok_mem[max_toks]; /* tokens */
+token_pointer tok_mem_end = tok_mem+max_toks-1; /* end of |tok_mem| */
+token_pointer tok_start[max_texts]; /* directory into |tok_mem| */
+token_pointer tok_ptr; /* first unused position in |tok_mem| */
+text_pointer text_ptr; /* first unused position in |tok_start| */
+text_pointer tok_start_end = tok_start+max_texts-1; /* end of |tok_start| */
+token_pointer max_tok_ptr; /* largest value of |tok_ptr| */
+@y
+token tok_mem[max_toks]; /* tokens */
+token_pointer tok_mem_end; /* end of |tok_mem| */
+token_pointer tok_start[max_texts]; /* directory into |tok_mem| */
+token_pointer tok_ptr; /* first unused position in |tok_mem| */
+text_pointer text_ptr; /* first unused position in |tok_start| */
+text_pointer tok_start_end; /* end of |tok_start| */
+token_pointer max_tok_ptr; /* largest value of |tok_ptr| */
+@z
+
+@x Section 26. (goes with the previous change)
+tok_start[1]=tok_mem+1;
+max_tok_ptr=tok_mem+1; max_text_ptr=tok_start+1;
+@y
+tok_start[1]=tok_mem+1;
+tok_mem_end=tok_mem+max_toks-1;
+tok_start_end=tok_start+max_texts-1;
+max_tok_ptr=tok_mem+1; max_text_ptr=tok_start+1;
+@z
+
+
+@x Section 27.
+ p->ilk=t; p->xref=(char*)xmem;
+@y
+ p->ilk=t; p->xref=(char huge*)xmem;
+@z
+
+
+@x Section 27.
+ p->xref=(char*)xmem;
+@y
+ p->xref=(char huge*)xmem;
+@z
+
+
+@x Section 70.
+ if (unindexed(lhs)) { /* retain only underlined entries */
+ xref_pointer q,r=NULL;
+ for (q=(xref_pointer)lhs->xref;q>xmem;q=q->xlink)
+ if (q->num<def_flag)
+ if (r) r->xlink=q->xlink;
+ else lhs->xref=(char*)q->xlink;
+ else r=q;
+ }
+@y
+ if (unindexed(lhs)) { /* retain only underlined entries */
+ xref_pointer q,r=NULL;
+ for (q=(xref_pointer)lhs->xref;q>xmem;q=q->xlink)
+ if (q->num<def_flag)
+ if (r) r->xlink=q->xlink;
+ else lhs->xref=(char huge*)q->xlink;
+ else r=q;
+ }
+@z
+
+
+@x Section 87.
+ char *k, *k_end=(p+1)->byte_start; /* pointers into |byte_mem| */
+ out('{');
+ for (k=p->byte_start; k<k_end; k++) {
+@y
+ char huge* k, huge* k_end=(p+1)->byte_start; /* pointers into |byte_mem| */
+ out('{');
+ for (k=p->byte_start; k<k_end; k++) {
+@z
+
+
+@x Section 116.
+ append_xref(0); /* this number doesn't matter */
+ xref_ptr->xlink=(xref_pointer)p->xref; r=xref_ptr;
+ p->xref=(char*)xref_ptr;
+ while (r->xlink!=q) {r->num=r->xlink->num; r=r->xlink;}
+ r->num=m; /* everything from |q| on is left undisturbed */
+@y
+ append_xref(0); /* this number doesn't matter */
+ xref_ptr->xlink=(xref_pointer)p->xref; r=xref_ptr;
+ p->xref=(char huge*)xref_ptr;
+ while (r->xlink!=q) {r->num=r->xlink->num; r=r->xlink;}
+ r->num=m; /* everything from |q| on is left undisturbed */
+@z
+
+
+@x Section 163.
+@ @<Change |pp| to $\max...@>=
+@y
+@ @<Change |pp| to $\max...@>=
+#ifdef __MSDOS__
+if (d<0 && pp+d>pp) pp=scrap_base; /* segmented architecture caused wrap */
+else
+#endif
+@z
+
+
+@x Section 194.
+ char *p; /* index into |byte_mem| */
+@y
+ char huge *p; /* index into |byte_mem| */
+@z
+
+
+@x Section 229.
+ if (cur_name->xref!=(char*)xmem) {
+@y
+ if (cur_name->xref!=(char huge*)xmem) {
+@z
+
+
+@x Section 232.
+char *cur_byte; /* index into |byte_mem| */
+@y
+char huge* cur_byte; /* index into |byte_mem| */
+@z
+
+
+@x Section 241.
+switch (cur_name->ilk) {
+ case normal: if (is_tiny(cur_name)) out_str("\\|");
+ else {char *j;
+@y
+switch (cur_name->ilk) {
+ case normal: if (is_tiny(cur_name)) out_str("\\|");
+ else {char huge* j;
+@z
+
+
+@x Section 241.
+ case custom: case quoted: {char *j; out_str("$\\");
+@y
+ case custom: case quoted: {char huge* j; out_str("$\\");
+@z
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