#include "charvec.h"

static const char rcsid[]=
    "$Id: charvec.c 142 2008-11-12 18:55:23Z rico $";

/* This implementation uses a "growable array" abstraction */

int charvec_fini(charvec_t *t) {
    if (t->a && t->free) {
        t->free(t->a);
        t->a = 0;
        t->max = 0;
    }
    t->len = 0;
    return 1;
}

#ifndef BASE_ALLOC
#define BASE_ALLOC 30
#endif
enum { BASE = BASE_ALLOC };

int charvec_need(charvec_t *t, unsigned int n) {
    if (t->a == 0) {
        t->len = 0;
        t->max = n;
        t->a = t->alloc(0, n * sizeof(char));
        return t->a != 0;
    }

    if (n > t->max) {
        unsigned int i = BASE + n + (n >> 3);
        void *p = t->alloc(t->a, i * sizeof(char));
        if (!p)
            return 0;
        t->max = i;
        t->a = p;
    }
    return 1;
}

int charvec_more(charvec_t *t, unsigned int n) {
    return charvec_need(t, n + t->len);
}

int charvec_append(charvec_t *t, char e) {
    if (!charvec_more(t, 1))
        return 0;
    t->a[t->len++] = e;
    return 1;
}

int charvec_fit(charvec_t *t) {
    unsigned int i = t->len;
    void *p = t->alloc(t->a, i * sizeof(char));
    if (!p)
        return 0;
    t->max = i;
    t->a = p;
    return 1;
}