1 files changed, 60 insertions, 0 deletions
diff --git a/sys/symtab/stopen.x b/sys/symtab/stopen.x
new file mode 100644
index 00000000..ede4f727
--- /dev/null
+++ b/sys/symtab/stopen.x
@@ -0,0 +1,60 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	"symtab.h"
+
+# STOPEN -- Create and initialize a new symbol table.  The size of the table
+# and the size of the hash index are user defined.  Any number of symbol
+# tables may be open simultaneously.  LEN_SYMBTAB is the initial length of
+# the symbol table in struct units.  LEN_INDEX is the number of hash threads;
+# a good choice for this value is twice the expected number of symbols in the
+# table, but good performance can be expected even if the number of symbols
+# is several times the size of the index.  The index consumes SZ_INT chars per
+# index element.
+
+pointer	procedure stopen (name, len_index, len_stab, sz_sbuf)
+
+char	name[ARB]		# symbol table name (optional)
+int	len_index		# number of hash threads in index
+int	len_stab		# initial length of STAB
+int	sz_sbuf			# initial size of string buffer
+
+pointer	stp
+int	stpstr()
+
+begin
+	# Allocate symtab descriptor.
+	call calloc (stp, LEN_SYMTAB, TY_STRUCT)
+	ST_MAGIC(stp) = MAGIC
+
+	# Allocate index.
+	call calloc (ST_INDEX(stp), len_index, TY_INT)
+	ST_INDEXLEN(stp) = len_index
+
+	# Allocate string buffer.  The first char of storage, at offset 0,
+	# is set to EOS so that offset 0 may be used to reference the null
+	# string.
+
+	call malloc (ST_SBUFP(stp), sz_sbuf, TY_CHAR)
+	ST_SBUFINC(stp) = max (1, nint (sz_sbuf * INC_START))
+	ST_SBUFLEN(stp) = sz_sbuf
+	ST_SBUFOP(stp)  = 1
+	ST_SBUFNGROW(stp) = 0
+	Memc[ST_SBUFP(stp)] = EOS
+
+	# Allocate symbol table.  The initial STABOP (offset into STAB) is set
+	# to 1 rather than 0 since 0 as an STAB offset is used to mark the end
+	# of a list.
+
+	call malloc (ST_STABP(stp), len_stab, TY_STRUCT)
+	ST_STABINC(stp) = max (1, nint (len_stab * INC_START))
+	ST_STABLEN(stp) = len_stab
+	ST_STABOP(stp)  = 1
+	ST_STABNGROW(stp) = 0
+
+	# Save the symbol table name in the string buffer.  This name is
+	# for documentation purposes only (it is printed by STINFO).
+
+	ST_NAME(stp) = stpstr (stp, name, 0)
+
+	return (stp)
+end