427 lines
9.9 KiB
C
427 lines
9.9 KiB
C
#include "first.h"
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#include "array.h"
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#include "buffer.h"
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <errno.h>
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#include <assert.h>
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#define ARRAY_NOT_FOUND ((size_t)(-1))
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array *array_init(void) {
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array *a;
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a = calloc(1, sizeof(*a));
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force_assert(a);
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return a;
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}
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array *array_init_array(array *src) {
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size_t i;
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array *a = array_init();
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if (0 == src->size) return a;
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a->used = src->used;
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a->size = src->size;
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a->unique_ndx = src->unique_ndx;
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a->data = malloc(sizeof(*src->data) * src->size);
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force_assert(NULL != a->data);
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for (i = 0; i < src->size; i++) {
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if (src->data[i]) a->data[i] = src->data[i]->copy(src->data[i]);
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else a->data[i] = NULL;
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}
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a->sorted = malloc(sizeof(*src->sorted) * src->size);
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force_assert(NULL != a->sorted);
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memcpy(a->sorted, src->sorted, sizeof(*src->sorted) * src->size);
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return a;
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}
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void array_free(array *a) {
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size_t i;
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if (!a) return;
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for (i = 0; i < a->size; i++) {
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if (a->data[i]) a->data[i]->free(a->data[i]);
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}
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if (a->data) free(a->data);
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if (a->sorted) free(a->sorted);
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free(a);
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}
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void array_reset(array *a) {
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size_t i;
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if (!a) return;
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for (i = 0; i < a->used; i++) {
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a->data[i]->reset(a->data[i]);
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}
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a->used = 0;
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a->unique_ndx = 0;
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}
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data_unset *array_pop(array *a) {
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data_unset *du;
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force_assert(a->used != 0);
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a->used --;
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du = a->data[a->used];
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force_assert(a->sorted[a->used] == a->used); /* only works on "simple" lists */
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a->data[a->used] = NULL;
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return du;
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}
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/* returns index of element or ARRAY_NOT_FOUND
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* if rndx != NULL it stores the position in a->sorted[] where the key needs
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* to be inserted
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*/
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static size_t array_get_index(array *a, const char *key, size_t keylen, size_t *rndx) {
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/* invariant: [lower-1] < key < [upper]
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* "virtual elements": [-1] = -INFTY, [a->used] = +INFTY
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* also an invariant: 0 <= lower <= upper <= a->used
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*/
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size_t lower = 0, upper = a->used;
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force_assert(upper <= SSIZE_MAX); /* (lower + upper) can't overflow */
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while (lower != upper) {
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size_t probe = (lower + upper) / 2;
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int cmp = buffer_caseless_compare(key, keylen, CONST_BUF_LEN(a->data[a->sorted[probe]]->key));
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assert(lower < upper); /* from loop invariant (lower <= upper) + (lower != upper) */
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assert((lower <= probe) && (probe < upper)); /* follows from lower < upper */
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if (cmp == 0) {
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/* found */
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if (rndx) *rndx = probe;
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return a->sorted[probe];
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} else if (cmp < 0) {
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/* key < [probe] */
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upper = probe; /* still: lower <= upper */
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} else {
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/* key > [probe] */
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lower = probe + 1; /* still: lower <= upper */
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}
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}
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/* not found: [lower-1] < key < [upper] = [lower] ==> insert at [lower] */
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if (rndx) *rndx = lower;
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return ARRAY_NOT_FOUND;
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}
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data_unset *array_get_element(array *a, const char *key) {
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size_t ndx;
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force_assert(NULL != key);
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if (ARRAY_NOT_FOUND != (ndx = array_get_index(a, key, strlen(key), NULL))) {
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/* found, return it */
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return a->data[ndx];
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}
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return NULL;
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}
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data_unset *array_extract_element(array *a, const char *key) {
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size_t ndx, pos;
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force_assert(NULL != key);
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if (ARRAY_NOT_FOUND != (ndx = array_get_index(a, key, strlen(key), &pos))) {
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/* found */
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const size_t last_ndx = a->used - 1;
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data_unset *entry = a->data[ndx];
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/* now we need to swap it with the last element (if it isn't already the last element) */
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if (ndx != last_ndx) {
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/* to swap we also need to modify the index in a->sorted - find pos of last_elem there */
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size_t last_elem_pos;
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/* last element must be present at the expected position */
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force_assert(last_ndx == array_get_index(a, CONST_BUF_LEN(a->data[last_ndx]->key), &last_elem_pos));
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/* move entry from last_ndx to ndx */
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a->data[ndx] = a->data[last_ndx];
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a->data[last_ndx] = NULL;
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/* fix index entry for moved entry */
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a->sorted[last_elem_pos] = ndx;
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} else {
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a->data[ndx] = NULL;
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}
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/* remove entry in a->sorted: move everything after pos one step to the left */
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if (pos != last_ndx) {
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memmove(a->sorted + pos, a->sorted + pos + 1, (last_ndx - pos) * sizeof(*a->sorted));
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}
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a->sorted[last_ndx] = ARRAY_NOT_FOUND;
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--a->used;
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return entry;
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}
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return NULL;
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}
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data_unset *array_get_unused_element(array *a, data_type_t t) {
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data_unset *ds = NULL;
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unsigned int i;
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for (i = a->used; i < a->size; i++) {
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if (a->data[i] && a->data[i]->type == t) {
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ds = a->data[i];
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/* make empty slot at a->used for next insert */
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a->data[i] = a->data[a->used];
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a->data[a->used] = NULL;
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return ds;
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}
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}
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return NULL;
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}
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void array_set_key_value(array *hdrs, const char *key, size_t key_len, const char *value, size_t val_len) {
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data_string *ds_dst;
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if (NULL != (ds_dst = (data_string *)array_get_element(hdrs, key))) {
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buffer_copy_string_len(ds_dst->value, value, val_len);
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return;
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}
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if (NULL == (ds_dst = (data_string *)array_get_unused_element(hdrs, TYPE_STRING))) {
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ds_dst = data_string_init();
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}
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buffer_copy_string_len(ds_dst->key, key, key_len);
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buffer_copy_string_len(ds_dst->value, value, val_len);
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array_insert_unique(hdrs, (data_unset *)ds_dst);
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}
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/* if entry already exists return pointer to existing entry, otherwise insert entry and return NULL */
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static data_unset **array_find_or_insert(array *a, data_unset *entry) {
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size_t ndx, pos, j;
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/* generate unique index if neccesary */
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if (buffer_is_empty(entry->key) || entry->is_index_key) {
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buffer_copy_int(entry->key, a->unique_ndx++);
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entry->is_index_key = 1;
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force_assert(0 != a->unique_ndx); /* must not wrap or we'll get problems */
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}
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/* try to find the entry */
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if (ARRAY_NOT_FOUND != (ndx = array_get_index(a, CONST_BUF_LEN(entry->key), &pos))) {
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/* found collision, return it */
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return &a->data[ndx];
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}
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/* insert */
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/* there couldn't possibly be enough memory to store so many entries */
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force_assert(a->used + 1 <= SSIZE_MAX);
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if (a->size == 0) {
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a->size = 16;
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a->data = malloc(sizeof(*a->data) * a->size);
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a->sorted = malloc(sizeof(*a->sorted) * a->size);
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force_assert(a->data);
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force_assert(a->sorted);
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for (j = a->used; j < a->size; j++) a->data[j] = NULL;
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} else if (a->size == a->used) {
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a->size += 16;
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a->data = realloc(a->data, sizeof(*a->data) * a->size);
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a->sorted = realloc(a->sorted, sizeof(*a->sorted) * a->size);
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force_assert(a->data);
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force_assert(a->sorted);
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for (j = a->used; j < a->size; j++) a->data[j] = NULL;
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}
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ndx = a->used;
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/* make sure there is nothing here */
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if (a->data[ndx]) a->data[ndx]->free(a->data[ndx]);
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a->data[a->used++] = entry;
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/* move everything one step to the right */
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if (pos != ndx) {
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memmove(a->sorted + (pos + 1), a->sorted + (pos), (ndx - pos) * sizeof(*a->sorted));
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}
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/* insert */
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a->sorted[pos] = ndx;
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return NULL;
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}
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/* replace or insert data (free existing entry) */
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void array_replace(array *a, data_unset *entry) {
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data_unset **old;
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force_assert(NULL != entry);
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if (NULL != (old = array_find_or_insert(a, entry))) {
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force_assert(*old != entry);
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(*old)->free(*old);
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*old = entry;
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}
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}
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void array_insert_unique(array *a, data_unset *entry) {
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data_unset **old;
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force_assert(NULL != entry);
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if (NULL != (old = array_find_or_insert(a, entry))) {
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force_assert((*old)->type == entry->type);
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entry->insert_dup(*old, entry);
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}
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}
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void array_print_indent(int depth) {
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int i;
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for (i = 0; i < depth; i ++) {
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fprintf(stdout, " ");
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}
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}
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size_t array_get_max_key_length(array *a) {
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size_t maxlen, i;
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maxlen = 0;
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for (i = 0; i < a->used; i ++) {
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data_unset *du = a->data[i];
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size_t len = strlen(du->key->ptr);
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if (len > maxlen) {
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maxlen = len;
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}
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}
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return maxlen;
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}
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int array_print(array *a, int depth) {
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size_t i;
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size_t maxlen;
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int oneline = 1;
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if (a->used > 5) {
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oneline = 0;
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}
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for (i = 0; i < a->used && oneline; i++) {
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data_unset *du = a->data[i];
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if (!du->is_index_key) {
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oneline = 0;
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break;
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}
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switch (du->type) {
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case TYPE_INTEGER:
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case TYPE_STRING:
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case TYPE_COUNT:
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break;
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default:
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oneline = 0;
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break;
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}
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}
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if (oneline) {
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fprintf(stdout, "(");
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for (i = 0; i < a->used; i++) {
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data_unset *du = a->data[i];
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if (i != 0) {
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fprintf(stdout, ", ");
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}
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du->print(du, depth + 1);
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}
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fprintf(stdout, ")");
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return 0;
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}
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maxlen = array_get_max_key_length(a);
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fprintf(stdout, "(\n");
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for (i = 0; i < a->used; i++) {
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data_unset *du = a->data[i];
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array_print_indent(depth + 1);
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if (!du->is_index_key) {
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int j;
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if (i && (i % 5) == 0) {
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fprintf(stdout, "# %zd\n", i);
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array_print_indent(depth + 1);
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}
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fprintf(stdout, "\"%s\"", du->key->ptr);
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for (j = maxlen - strlen(du->key->ptr); j > 0; j --) {
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fprintf(stdout, " ");
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}
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fprintf(stdout, " => ");
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}
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du->print(du, depth + 1);
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fprintf(stdout, ",\n");
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}
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if (!(i && (i - 1 % 5) == 0)) {
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array_print_indent(depth + 1);
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fprintf(stdout, "# %zd\n", i);
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}
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array_print_indent(depth);
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fprintf(stdout, ")");
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return 0;
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}
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#ifdef DEBUG_ARRAY
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int main (int argc, char **argv) {
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array *a;
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data_string *ds;
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data_count *dc;
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UNUSED(argc);
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UNUSED(argv);
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a = array_init();
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ds = data_string_init();
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buffer_copy_string_len(ds->key, CONST_STR_LEN("abc"));
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buffer_copy_string_len(ds->value, CONST_STR_LEN("alfrag"));
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array_insert_unique(a, (data_unset *)ds);
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ds = data_string_init();
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buffer_copy_string_len(ds->key, CONST_STR_LEN("abc"));
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buffer_copy_string_len(ds->value, CONST_STR_LEN("hameplman"));
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array_insert_unique(a, (data_unset *)ds);
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ds = data_string_init();
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buffer_copy_string_len(ds->key, CONST_STR_LEN("123"));
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buffer_copy_string_len(ds->value, CONST_STR_LEN("alfrag"));
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array_insert_unique(a, (data_unset *)ds);
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dc = data_count_init();
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buffer_copy_string_len(dc->key, CONST_STR_LEN("def"));
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array_insert_unique(a, (data_unset *)dc);
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dc = data_count_init();
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buffer_copy_string_len(dc->key, CONST_STR_LEN("def"));
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array_insert_unique(a, (data_unset *)dc);
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array_print(a, 0);
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array_free(a);
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fprintf(stderr, "%d\n",
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buffer_caseless_compare(CONST_STR_LEN("Content-Type"), CONST_STR_LEN("Content-type")));
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return 0;
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}
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#endif
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