1 files changed, 42 insertions, 0 deletions
diff --git a/sys/mwcs/mwallocs.x b/sys/mwcs/mwallocs.x
new file mode 100644
index 00000000..6a9caf5b
--- /dev/null
+++ b/sys/mwcs/mwallocs.x
@@ -0,0 +1,42 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	"mwcs.h"
+
+# MW_ALLOCS -- Allocate space in the global string buffer.  The size of the
+# buffer is automatically increased if necessary.  Note that reallocation of
+# the buffer may cause it to move, hence all data items are referred to by
+# their offset in the buffer, rather than by an absolute pointer.  Since we
+# are allocating space for string data, a space for the EOS is automatically
+# allocated in addition to space for the indicated number of data chars.
+
+int procedure mw_allocs (mw, nchars)
+
+pointer	mw		#I pointer to MWCS descriptor
+int	nchars		#I number of chars to allocate space for
+
+int	sbufused, sbuflen, offset, nelem
+errchk	realloc
+
+begin
+	sbufused = MI_SBUFUSED(mw)
+	sbuflen  = MI_SBUFLEN(mw)
+	offset   = sbufused + 1
+	nelem	 = nchars + 1
+
+	# Increase buffer size?
+	if (sbufused + nelem > sbuflen) {
+	    sbuflen = sbuflen + INC_SZSBUF
+	    while (sbufused + nelem > sbuflen)
+		sbuflen = sbuflen + INC_SZSBUF
+
+	    call realloc (MI_SBUF(mw), sbuflen, TY_CHAR)
+	    call aclrc (S(mw,offset), sbuflen - offset + 1)
+	    MI_SBUFLEN(mw) = sbuflen
+	}
+
+	# Allocate the space in the buffer, and return the buffer offset
+	# of the allocated area.
+
+	MI_SBUFUSED(mw) = max (0, sbufused + nelem)
+	return (offset)
+end