Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include "String.h"

/* 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;
}