Initial commit

1 files changed, 69 insertions, 0 deletions

diff --git a/sys/symtab/strestore.x b/sys/symtab/strestore.x
new file mode 100644
index 00000000..b3989d2b
--- /dev/null
+++ b/sys/symtab/strestore.x
@@ -0,0 +1,69 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	"symtab.h"
+
+# STRESTORE -- Restore to memory a symbol table previously saved in a file
+# with STSAVE.  The file must be positioned to the correct offset before
+# we are called.  STRESTORE is called in place of STOPEN and returns a
+# symtab descriptor pointer as the function value.  The symbol table is
+# restored to exactly the state it was in when STSAVE was called.  Note
+# that since SYMTAB symbol tables use only relative offsets internally,
+# the data structures may be relocated anywhere in memory when they are
+# read back from the file.  The symbol table is stored externally in a
+# machine independent binary file.
+
+pointer procedure strestore (fd)
+
+int	fd			# file from which symbol table is to be read
+
+int	nelem
+pointer	stp, stab, sbuf, index
+int	miireadc(), miireadi()
+errchk	miireadc, miireadi
+define	readerr_ 91
+
+begin
+	index = NULL
+	stab  = NULL
+	sbuf  = NULL
+
+	# Read symbol table descriptor.
+	call malloc (stp, LEN_SYMTAB, TY_STRUCT)
+	if (miireadi (fd, Memi[stp], LEN_SYMTAB) < LEN_SYMTAB)
+	    goto readerr_
+
+	if (ST_MAGIC(stp) != MAGIC)
+	    call error (1, "strestore: bad magic in save file")
+
+	# Read the hash table index.
+	nelem = ST_INDEXLEN(stp)
+	call malloc (index, nelem, TY_INT)
+	if (miireadi (fd, Memi[index], nelem) < nelem)
+	    goto readerr_
+
+	# Read the symbol table data.
+	nelem = ST_STABLEN(stp)
+	call malloc (stab, nelem, TY_STRUCT)
+	if (miireadi (fd, Memi[stab], nelem) < nelem)
+	    goto readerr_
+
+	# Read the string buffer.
+	nelem = ST_SBUFLEN(stp)
+	call malloc (sbuf, nelem, TY_CHAR)
+	if (miireadc (fd, Memc[sbuf], nelem) < nelem)
+	    goto readerr_
+
+	ST_INDEX(stp) = index
+	ST_SBUFP(stp) = sbuf
+	ST_STABP(stp) = stab
+
+	return (stp)
+
+readerr_
+	call mfree (sbuf,  TY_CHAR)
+	call mfree (stab,  TY_STRUCT)
+	call mfree (index, TY_INT)
+	call mfree (stp,   TY_STRUCT)
+
+	call error (2, "strestore: unexpected EOF")
+end