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# 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
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