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Annotation of 41BSD/lib/libpc/PACK.c, revision 1.1

1.1     ! root        1: /* Copyright (c) 1979 Regents of the University of California */
        !             2: 
        !             3: static char sccsid[] = "@(#)PACK.c 1.1 10/29/80";
        !             4: 
        !             5: #include "h01errs.h"
        !             6: 
        !             7: /*
        !             8:  * pack(a,i,z)
        !             9:  *
        !            10:  * with:       a: array[m..n] of t
        !            11:  *     z: packed array[u..v] of t
        !            12:  *
        !            13:  * semantics:  for j := u to v do
        !            14:  *                     z[j] := a[j-u+i];
        !            15:  *
        !            16:  * need to check:
        !            17:  *     1. i >= m
        !            18:  *     2. i+(v-u) <= n         (i.e. i-m <= (n-m)-(v-u))
        !            19:  *
        !            20:  * on stack:   lv(z), lv(a), rv(i) (len 4)
        !            21:  *
        !            22:  * move w(t)*(v-u+1) bytes from lv(a)+w(t)*(i-m) to lv(z)
        !            23:  */
        !            24: 
        !            25: PACK(i, a, z, size_a, lb_a, ub_a, size_z)
        !            26: 
        !            27:        int     i;      /* subscript into a to begin packing */
        !            28:        char    *a;     /* pointer to structure a */
        !            29:        char    *z;     /* pointer to structure z */
        !            30:        int     size_a; /* sizeof(a_type) */
        !            31:        int     lb_a;   /* lower bound of structure a */
        !            32:        int     ub_a;   /* (upper bound of a) - (lb_a + sizeof(z_type)) */
        !            33:        int     size_z; /* sizeof(z_type) */
        !            34: {
        !            35:        int             subscr;
        !            36:        register char   *cp;
        !            37:        register char   *zp = z;
        !            38:        register char   *limit;
        !            39: 
        !            40:        subscr = i - lb_a;
        !            41:        if (subscr < 0 || subscr > ub_a) {
        !            42:                ERROR(EPACK, i);
        !            43:                return;
        !            44:        }
        !            45:        cp = &a[subscr * size_a];
        !            46:        limit = cp + size_z;
        !            47:        do      {
        !            48:                *zp++ = *cp++;
        !            49:        } while (cp < limit);
        !            50: }

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