40 lines
1.0 KiB
C
40 lines
1.0 KiB
C
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/*
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* Copyright (c) 1993 by the University of Southern California
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*
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* For copying and distribution information, please see the file
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* <usc-license.h>.
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*/
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#include <usc-license.h>
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#include <pfs.h> /* assert, internal_error, prototypes */
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/* Generate a unique magic number (positive long). This is based upon hashing
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the vlink VL's HSONAME field. */
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long
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generate_magic(VLINK vl)
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{
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long retval = 0L;
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int n = p_bstlen(vl->hsoname);
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int rvoffset = 0; /* offset for xoring with the return value. */
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while(n--) {
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rvoffset += 8;
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if (rvoffset >= 8 * sizeof retval) rvoffset = 0;
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retval ^= ((vl->hsoname[n]) << rvoffset);
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}
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if (retval < 0) return ~retval;
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if (retval == 0) return 1;
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return retval;
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}
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/* Is the magic number MAGIC anywhere in use in the list of vlinks LINKS? */
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int
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magic_no_in_list(long magic, VLINK links)
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{
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for ( ;links ; links = links->next) {
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if (links->f_magic_no == magic) return TRUE;
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}
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return FALSE;
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}
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