Return to lexeq.c CVS log

Up to [CSRG BSD Unix] / 43BSD / contrib / icon / operators

Annotation of 43BSD/contrib/icon/operators/lexeq.c, revision 1.1

1.1     ! root        1: #include "../h/rt.h"
        !             2: 
        !             3: /*
        !             4:  * x == y - test if x is lexically equal to y.
        !             5:  */
        !             6: 
        !             7: lexeq(nargs, arg2, arg1, arg0)
        !             8: int nargs;
        !             9: struct descrip arg2, arg1, arg0;
        !            10:    {
        !            11:    DclSave
        !            12:    register int t, i;
        !            13:    register char *s1, *s2;
        !            14:    char sbuf1[MAXSTRING], sbuf2[MAXSTRING];
        !            15:    extern char *alcstr();
        !            16: 
        !            17:    SetBound;
        !            18:    /*
        !            19:     * x and y must be strings.  Save the cvstr return value for y because
        !            20:     *  y is the result (if any).
        !            21:     */
        !            22:    if (cvstr(&arg1, sbuf1) == NULL)
        !            23:       runerr(103, &arg1);
        !            24:    if ((t = cvstr(&arg2, sbuf2)) == NULL)
        !            25:       runerr(103, &arg2);
        !            26: 
        !            27:    /*
        !            28:     * If the strings have different lengths they can't be equal
        !            29:     */
        !            30:    if (STRLEN(arg1) != STRLEN(arg2))
        !            31:       fail();
        !            32: 
        !            33:    /*
        !            34:     * compare the strings
        !            35:     */
        !            36:    i = STRLEN(arg1);
        !            37:    s1 = STRLOC(arg1);
        !            38:    s2 = STRLOC(arg2);
        !            39:    while (i--)
        !            40:       if (*s1++ != *s2++)
        !            41:          fail();
        !            42: 
        !            43:    /*
        !            44:     * Return y as the result of the comparison.  If y was converted to
        !            45:     *  a string, a copy of it is allocated.
        !            46:     */
        !            47:    arg0 = arg2;
        !            48:    if (t == 1)
        !            49:       STRLOC(arg0) = alcstr(STRLOC(arg0), STRLEN(arg0));
        !            50:    ClearBound;
        !            51:    }
        !            52: 
        !            53: Opblock(lexeq,2,"==")

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.