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Annotation of 43BSD/contrib/icon/functions/match.c, revision 1.1

1.1     ! root        1: #include "../h/rt.h"
        !             2: 
        !             3: /*
        !             4:  * match(s1,s2,i,j) - test if s1 is prefix of s2[i:j].
        !             5:  */
        !             6: Xmatch(nargs, arg4, arg3, arg2, arg1, arg0)
        !             7: int nargs;
        !             8: struct descrip arg4, arg3, arg2, arg1, arg0;
        !             9:    {
        !            10:    register int i;
        !            11:    register char *s1, *s2;
        !            12:    int j, t;
        !            13:    long l1, l2;
        !            14:    char sbuf1[MAXSTRING], sbuf2[MAXSTRING];
        !            15: 
        !            16:    /*
        !            17:     * s1 must be a string.  s2 defaults to &subject;  i defaults to &pos
        !            18:     *  if s defaulted, 1 otherwise; j defaults to 0.
        !            19:     */
        !            20:    if (cvstr(&arg1, sbuf1) == NULL)
        !            21:       runerr(103, &arg1);
        !            22:    if (defstr(&arg2, sbuf2, &k_subject))
        !            23:       defint(&arg3, &l1, k_pos);
        !            24:    else
        !            25:       defint(&arg3, &l1, 1);
        !            26:    defint(&arg4, &l2, 0);
        !            27: 
        !            28:    /*
        !            29:     * Convert i and j to absolute positions and then make i the smaller
        !            30:     *  of the two positions and make j the length of the substring.
        !            31:     */
        !            32:    i = cvpos(l1, STRLEN(arg2));
        !            33:    j = cvpos(l2, STRLEN(arg2));
        !            34:    if (i > j) {
        !            35:       t = i;
        !            36:       i = j;
        !            37:       j = t - j;
        !            38:       }
        !            39:    else
        !            40:       j = j - i;
        !            41: 
        !            42:    /*
        !            43:     * Can't match unless s1 is as long as s2[i:j].
        !            44:     */
        !            45:    if (j < STRLEN(arg1))
        !            46:       fail();
        !            47: 
        !            48:    /*
        !            49:     * Compare s1 with s2[i:j] for *s1 characters; fail if an inequality
        !            50:     *  if found.
        !            51:     */
        !            52:    s1 = STRLOC(arg1);
        !            53:    s2 = STRLOC(arg2) + i - 1;
        !            54:    for (j = STRLEN(arg1); j > 0; j--)
        !            55:       if (*s1++ != *s2++)
        !            56:          fail();
        !            57: 
        !            58:    /*
        !            59:     * Return position of end of matched string in s2.
        !            60:     */
        !            61:    arg0.type = D_INTEGER;
        !            62:    INTVAL(arg0) = i + STRLEN(arg1);
        !            63:    }
        !            64: 
        !            65: Procblock(match,4)

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