* [9fans] forgotten rc hack
@ 2008-07-02 1:00 erik quanstrom
0 siblings, 0 replies; only message in thread
From: erik quanstrom @ 2008-07-02 1:00 UTC (permalink / raw)
To: 9fans
some time ago, i had a want for es-style subscripting like
; x=(1 2 3)
; echo $x(1-2)
1 2
; echo $x(2-)
2 3
; x = $x(2-) # shift x
i'd forgotten all about it. the following replacement for
exec.c:subwords() is all that you need to enable this.
- erik
----
word*
copynwords(word *a, word *tail, int n)
{
word *v = 0, **end;
for(end=&v;a && n-- != 0;a = a->next,end=&(*end)->next)
*end = newword(a->word, 0);
*end = tail;
return v;
}
word*
subwords(word *val, int len, word *sub, word *a)
{
int n, m;
char *s;
if(!sub)
return a;
s = sub->word;
deglob(s);
a = subwords(val, len, sub->next, a);
n = 0; m = 0;
while('0'<=*s && *s<='9') n = n*10+ *s++ -'0';
if(*s++ == '-'){
if(*s) while('0'<=*s && *s<='9') m = m*10+ *s++ -'0';
else m = len;
m -= n;
}
if(n<1 || len<n)
return a;
while(--n) val = val->next;
return copynwords(val, a, m+1);
}
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