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/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
*/
#define import_spp
#define import_knames
#include <iraf.h>
/* CHRUPK -- Unpack a byte string into XCHAR. This routine does not
* know about EOS terminators. The input and output arrays may be the same.
* Note that while XCHAR is signed, the signedness of the C char is unspecified,
* hence we pack the chars into unsigned bytes and restore the sign explicitly.
*/
CHRUPK (a, a_off, b, b_off, nchars)
XCHAR *a, *b;
XINT *a_off, *b_off, *nchars;
{
register unsigned char *ip;
register XCHAR *op;
register int n, ch;
/* Set pointers to last char plus one so that we can unpack the array
* in the reverse direction.
*/
n = *nchars;
ip = &((unsigned char *)a)[*a_off-1+n];
op = &b[*b_off-1+n];
/* Unpack string from right to left.
*/
while (--n >= 0)
*--op = ((ch = *--ip) <= 127) ? ch : ch - 256;
}
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