Return to right.c CVS log

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

Annotation of 43BSD/contrib/icon/functions/right.c, revision 1.1.1.1

1.1       root        1: #include "../h/rt.h"
                      2: 
                      3: /*
                      4:  * right(s1,n,s2) - pad s1 on left with s2 to length n.
                      5:  */
                      6: 
                      7: Xright(nargs, arg3, arg2, arg1, arg0)
                      8: int nargs;
                      9: struct descrip arg3, arg2, arg1, arg0;
                     10:    {
                     11:    register char *s, *st;
                     12:    int cnt, slen;
                     13:    char *sbuf, *s3, sbuf1[MAXSTRING], sbuf2[MAXSTRING];
                     14:    extern char *alcstr();
                     15: 
                     16:    /*
                     17:     * s1 must be a string.  n must be a non-negative integer and defaults
                     18:     *  to 1.  s2 must be a string and defaults to a blank.
                     19:     */
                     20:    if (cvstr(&arg1, sbuf1) == NULL)
                     21:       runerr(103, &arg1);
                     22:    defshort(&arg2, 1);
                     23:    if ((cnt = INTVAL(arg2)) < 0)
                     24:       runerr(205, &arg2);
                     25:    defstr(&arg3, sbuf2, &blank);
                     26: 
                     27:    sneed(cnt);
                     28: 
                     29:    if (STRLEN(arg3) == 0) {
                     30:       /*
                     31:        * The padding string is null, make it a blank.
                     32:        */
                     33:       slen = 1;
                     34:       s3 = " ";
                     35:       }
                     36:    else {
                     37:       slen = STRLEN(arg3);
                     38:       s3 = STRLOC(arg3);
                     39:       }
                     40: 
                     41:    /*
                     42:     * Get n bytes of string space.  Start at the left end of the new
                     43:     *  string and copy s2 into the new string as many times as it fits.
                     44:     */
                     45:    sbuf = alcstr(NULL, cnt);
                     46:    s = sbuf;
                     47:    while (s < sbuf + cnt) {
                     48:       st = s3;
                     49:       while (st < s3 + slen && s < sbuf + cnt)
                     50:          *s++ = *st++;
                     51:       }
                     52: 
                     53:    /*
                     54:     * Copy s1 into the new string, starting at the right end and copying
                     55:     *  s2 from right to left.  If *s1 > n, only copy n bytes.
                     56:     */
                     57:    s = sbuf + cnt;
                     58:    slen = STRLEN(arg1);
                     59:    st = STRLOC(arg1) + slen;
                     60:    if (slen > cnt)
                     61:       slen = cnt;
                     62:    while (slen-- > 0)
                     63:       *--s = *--st;
                     64: 
                     65:    /*
                     66:     * Return the new string.
                     67:     */
                     68:    STRLEN(arg0) = cnt;
                     69:    STRLOC(arg0) = sbuf;
                     70:    }
                     71: 
                     72: Procblock(right,3)

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