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Annotation of 43BSD/contrib/icon/operators/lexeq.c, revision 1.1.1.1

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,"==")

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