/* grow a String's allocation by at least `incr' bytes */
extern String*
s_grow(String *s, int incr)
{
char *cp;
int size;
if(s->fixed)
sysfatal("s_grow of constant string");
s = s_unique(s);
/*
* take a larger increment to avoid mallocing too often
*/
size = s->end-s->base;
if(size/2 < incr)
size += incr;
else
size += size/2;
cp = realloc(s->base, size);
if (cp == 0)
sysfatal("s_grow: %r");
s->ptr = (s->ptr - s->base) + cp;
s->end = cp + size;
s->base = cp;
return s;
}
String*
s_restart(String *s)
{
s = s_unique(s);
s->ptr = s->base;
return s;
}
String*
s_reset(String *s)
{
if(s != nil){
s = s_unique(s);
s->ptr = s->base;
*s->ptr = '\0';
} else
s = s_new();
return s;
}
