Initial commit

1 files changed, 54 insertions, 0 deletions

diff --git a/sys/symtab/symtab.h b/sys/symtab/symtab.h
new file mode 100644
index 00000000..25f30ace
--- /dev/null
+++ b/sys/symtab/symtab.h
@@ -0,0 +1,54 @@
+# SYMTAB definitions.
+
+define	MAX_HASHCHARS	18		# max characters used in hash function
+define	SZ_ASCII	128		# max possible character values
+define	INC_START	0.50		# used in overflow algorithm
+define	INC_GROW	2		# growing factor for increment
+define	MAX_INCREMENT	32768		# max sbuf or stab increment
+define	MAX_SZKEY	256		# arbitrarily large number
+
+# Symbol table descriptor.
+
+define	LEN_SYMTAB	256
+define	MAGIC		0123124B
+
+define	ST_MAGIC	Memi[$1]	# for error checking
+define	ST_NAME		Memi[$1+1]	# optional name for symbol table
+define	ST_LASTSYMBOL	Memi[$1+2]	# last element entered
+define	ST_NSYMBOLS	Memi[$1+3]	# number of symbols in table
+			# (extra space)
+define	ST_INDEX	Memi[$1+5]	# pointer to buffer of thread indices
+define	ST_INDEXLEN	Memi[$1+6]	# length of index
+			# (extra space)
+define	ST_SBUFP	Memi[$1+10]	# string buffer
+define	ST_SBUFLEN	Memi[$1+11]	# current size of string buffer
+define	ST_SBUFOP	Memi[$1+12]	# next location in string buffer
+define	ST_SBUFINC	Memi[$1+13]	# increment if overflow occurs
+define	ST_SBUFNGROW	Memi[$1+14]	# number of reallocs of sbuf
+			# (extra space)
+define	ST_STABP	Memi[$1+20]	# symbol table
+define	ST_STABLEN	Memi[$1+21]	# symbol table length
+define	ST_STABOP	Memi[$1+22]	# next location in symbol table
+define	ST_STABINC	Memi[$1+23]	# increment if overflow occurs
+define	ST_STABNGROW	Memi[$1+24]	# number of reallocs of stab
+			# (extra space)
+define	ST_ASCII	Memi[($1+30)+$2]
+
+# Symstruct.  STAB contains an array of these, each of which is linked both
+# on a thread and on the global lifo list.
+
+define	LEN_SYMSTRUCT	4
+
+define	E_NEXTHASH	Memi[$1]	# next element on thread
+define	E_NEXTGLOB	Memi[$1+1]	# next element on global list
+define	E_THREAD	Memi[$1+2]	# index of thread in INDEX array
+define	E_KEY		Memi[$1+3]	# index of key name
+
+define	E_USERFIELDS	($1+LEN_SYMSTRUCT)
+define	E_BASE		($1-LEN_SYMSTRUCT)
+
+# Magic marker structure (for mark/free).
+
+define	LEN_MARKER	2
+define	M_SBUFOP	Memi[$1]	# saved string buffer offset
+define	M_NSYMBOLS	Memi[$1+1]	# nsymbols in table below marker