xref: /lighttpd1.4/src/array.c (revision 6e78c2c8)

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

#include <errno.h>
#include <assert.h>

#include "array.h"
#include "buffer.h"

array *array_init(void) {
	array *a;

	a = calloc(1, sizeof(*a));
	assert(a);

	a->next_power_of_2 = 1;

	return a;
}

array *array_init_array(array *src) {
	size_t i;
	array *a = array_init();

	a->used = src->used;
	a->size = src->size;
	a->next_power_of_2 = src->next_power_of_2;
	a->unique_ndx = src->unique_ndx;

	a->data = malloc(sizeof(*src->data) * src->size);
	for (i = 0; i < src->size; i++) {
		if (src->data[i]) a->data[i] = src->data[i]->copy(src->data[i]);
		else a->data[i] = NULL;
	}

	a->sorted = malloc(sizeof(*src->sorted)   * src->size);
	memcpy(a->sorted, src->sorted, sizeof(*src->sorted)   * src->size);
	return a;
}

void array_free(array *a) {
	size_t i;
	if (!a) return;

	for (i = 0; i < a->size; i++) {
		if (a->data[i]) a->data[i]->free(a->data[i]);
	}

	if (a->data) free(a->data);
	if (a->sorted) free(a->sorted);

	free(a);
}

void array_reset(array *a) {
	size_t i;
	if (!a) return;

	for (i = 0; i < a->used; i++) {
		a->data[i]->reset(a->data[i]);
	}

	a->used = 0;
}

data_unset *array_pop(array *a) {
	data_unset *du;

	assert(a->used != 0);

	a->used --;
	du = a->data[a->used];
	a->data[a->used] = NULL;

	return du;
}

static int array_get_index(array *a, const char *key, size_t keylen, int *rndx) {
	int ndx = -1;
	int i, pos = 0;

	if (key == NULL) return -1;

	/* try to find the string */
	for (i = pos = a->next_power_of_2 / 2; ; i >>= 1) {
		int cmp;

		if (pos < 0) {
			pos += i;
		} else if (pos >= (int)a->used) {
			pos -= i;
		} else {
			cmp = buffer_caseless_compare(key, keylen, a->data[a->sorted[pos]]->key->ptr, a->data[a->sorted[pos]]->key->used);

			if (cmp == 0) {
				/* found */
				ndx = a->sorted[pos];
				break;
			} else if (cmp < 0) {
				pos -= i;
			} else {
				pos += i;
			}
		}
		if (i == 0) break;
	}

	if (rndx) *rndx = pos;

	return ndx;
}

data_unset *array_get_element(array *a, const char *key) {
	int ndx;

	if (-1 != (ndx = array_get_index(a, key, strlen(key) + 1, NULL))) {
		/* found, leave here */

		return a->data[ndx];
	}

	return NULL;
}

data_unset *array_get_unused_element(array *a, data_type_t t) {
	data_unset *ds = NULL;

	UNUSED(t);

	if (a->size == 0) return NULL;

	if (a->used == a->size) return NULL;

	if (a->data[a->used]) {
		ds = a->data[a->used];

		a->data[a->used] = NULL;
	}

	return ds;
}

/* replace or insert data, return the old one with the same key */
data_unset *array_replace(array *a, data_unset *du) {
	int ndx;
	if (-1 == (ndx = array_get_index(a, du->key->ptr, du->key->used, NULL))) {
		array_insert_unique(a, du);
		return NULL;
	}
	else {
		data_unset *old = a->data[ndx];
		a->data[ndx] = du;
		return old;
	}
}

int array_insert_unique(array *a, data_unset *str) {
	int ndx = -1;
	int pos = 0;
	size_t j;

	/* generate unique index if neccesary */
	if (str->key->used == 0) {
		buffer_copy_long(str->key, a->unique_ndx++);
	}

	/* try to find the string */

	if (-1 != (ndx = array_get_index(a, str->key->ptr, str->key->used, &pos))) {
		/* found, leave here */
		if (a->data[ndx]->type == str->type) {
			str->insert_dup(a->data[ndx], str);
		} else {
			fprintf(stderr, "a\n");
		}
		return 0;
	}

	/* insert */

	if (a->used+1 > INT_MAX) {
		/* we can't handle more then INT_MAX entries: see array_get_index() */
		return -1;
	}

	if (a->size == 0) {
		a->size   = 16;
		a->data   = malloc(sizeof(*a->data)     * a->size);
		a->sorted = malloc(sizeof(*a->sorted)   * a->size);
		assert(a->data);
		assert(a->sorted);
		for (j = a->used; j < a->size; j++) a->data[j] = NULL;
	} else if (a->size == a->used) {
		a->size  += 16;
		a->data   = realloc(a->data,   sizeof(*a->data)   * a->size);
		a->sorted = realloc(a->sorted, sizeof(*a->sorted) * a->size);
		assert(a->data);
		assert(a->sorted);
		for (j = a->used; j < a->size; j++) a->data[j] = NULL;
	}

	ndx = (int) a->used;

	a->data[a->used++] = str;

	if (pos != ndx &&
	    ((pos < 0) ||
	     buffer_caseless_compare(str->key->ptr, str->key->used, a->data[a->sorted[pos]]->key->ptr, a->data[a->sorted[pos]]->key->used) > 0)) {
		pos++;
	}

	/* move everything on step to the right */
	if (pos != ndx) {
		memmove(a->sorted + (pos + 1), a->sorted + (pos), (ndx - pos) * sizeof(*a->sorted));
	}

	/* insert */
	a->sorted[pos] = ndx;

	if (a->next_power_of_2 == (size_t)ndx) a->next_power_of_2 <<= 1;

	return 0;
}

void array_print_indent(int depth) {
	int i;
	for (i = 0; i < depth; i ++) {
		fprintf(stderr, "  ");
	}
}

int array_print(array *a, int depth) {
	size_t i;

	for (i = 0; i < a->used; i++) {
		array_print_indent(depth);
		fprintf(stderr, "%d: ", i);
		a->data[i]->print(a->data[i], depth + 1);
		fprintf(stderr, "\n");
	}

	return 0;
}

#ifdef DEBUG_ARRAY
int main (int argc, char **argv) {
	array *a;
	data_string *ds;
	data_count *dc;

	UNUSED(argc);
	UNUSED(argv);

	a = array_init();

	ds = data_string_init();
	buffer_copy_string(ds->key, "abc");
	buffer_copy_string(ds->value, "alfrag");

	array_insert_unique(a, (data_unset *)ds);

	ds = data_string_init();
	buffer_copy_string(ds->key, "abc");
	buffer_copy_string(ds->value, "hameplman");

	array_insert_unique(a, (data_unset *)ds);

	ds = data_string_init();
	buffer_copy_string(ds->key, "123");
	buffer_copy_string(ds->value, "alfrag");

	array_insert_unique(a, (data_unset *)ds);

	dc = data_count_init();
	buffer_copy_string(dc->key, "def");

	array_insert_unique(a, (data_unset *)dc);

	dc = data_count_init();
	buffer_copy_string(dc->key, "def");

	array_insert_unique(a, (data_unset *)dc);

	array_print(a, 0);

	array_free(a);

	fprintf(stderr, "%d\n",
	       buffer_caseless_compare(CONST_STR_LEN("Content-Type"), CONST_STR_LEN("Content-type")));

	return 0;
}
#endif