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/* http://www.martinbroadhurst.com/dynamic-array-in-c.html */
#include <viv/dynamic_array.h>
#include <stdlib.h>
#include <string.h>
#define START_SIZE 4 /* Initial buffer size if not specified */
VIV_DYNAMIC_ARRAY_dynamic_array *VIV_DYNAMIC_ARRAY_create(unsigned int size) {
VIV_DYNAMIC_ARRAY_dynamic_array *array = malloc(
sizeof(VIV_DYNAMIC_ARRAY_dynamic_array)
);
if (array != NULL) {
if (size) {
array->buffer = malloc(size * sizeof(void *));
if (array->buffer) {
array->size = size;
} else {
free(array);
array = NULL;
}
} else {
array->buffer = NULL;
array->size = 0;
}
array->count = 0;
}
return array;
}
void VIV_DYNAMIC_ARRAY_empty(VIV_DYNAMIC_ARRAY_dynamic_array *array) {
array->count = 0;
}
void VIV_DYNAMIC_ARRAY_delete(VIV_DYNAMIC_ARRAY_dynamic_array *array) {
if (array) {
free(array->buffer);
free(array);
}
}
void VIV_DYNAMIC_ARRAY_add_tail(
VIV_DYNAMIC_ARRAY_dynamic_array *array,
void *data
) {
if (array->count == array->size) {
/* No more space */
if (array->buffer != NULL) {
void **buffer = realloc(
array->buffer,
array->size * 2 * sizeof(void *)
);
array->buffer = buffer;
array->size *= 2;
} else {
array->buffer = malloc(START_SIZE * sizeof(void *));
array->size = START_SIZE;
}
}
if (array->buffer != NULL) {
array->buffer[array->count] = data;
array->count++;
}
}
void VIV_DYNAMIC_ARRAY_add_head(
VIV_DYNAMIC_ARRAY_dynamic_array *array,
void *data
) {
if (array->count == array->size) {
/* No more space */
if (array->buffer != NULL) {
void **temp = malloc(array->size * 2 * sizeof(void *));
if (temp) {
/* Copy the elements one space to the right */
memcpy(temp + 1, array->buffer, array->count * sizeof(void *));
free(array->buffer);
array->buffer = temp;
array->size *= 2;
}
} else {
array->buffer = malloc(START_SIZE * sizeof(void *));
if (array->buffer) {
array->size = START_SIZE;
}
}
} else {
/* Move the elements one space to the right */
memmove(
array->buffer + 1,
array->buffer,
array->count * sizeof(void *)
);
}
if (array->buffer != NULL) {
array->buffer[0] = data;
array->count++;
}
}
void *VIV_DYNAMIC_ARRAY_remove_tail(VIV_DYNAMIC_ARRAY_dynamic_array *array) {
void *data = NULL;
if (array->count > 0) {
data = array->buffer[array->count - 1];
array->count--;
}
return data;
}
void *VIV_DYNAMIC_ARRAY_remove_head(VIV_DYNAMIC_ARRAY_dynamic_array *array) {
void *data = NULL;
if (array->count > 0) {
data = array->buffer[0];
/* Move the elements one space to the left */
memmove(
array->buffer,
array->buffer + 1,
(array->count - 1) * sizeof(void *)
);
array->count--;
}
return data;
}
void VIV_DYNAMIC_ARRAY_insert(
VIV_DYNAMIC_ARRAY_dynamic_array *array,
unsigned int pos,
void *data
) {
if (pos == 0) {
VIV_DYNAMIC_ARRAY_add_head(array, data);
} else if (pos == array->count) {
VIV_DYNAMIC_ARRAY_add_tail(array, data);
} else if (pos < array->count) {
/* unsigned int i; */
if (array->count == array->size) {
/* Reallocate the buffer and copy, leaving a space */
void **temp = malloc(array->size * 2 * sizeof(void *));
if (temp) {
memcpy(temp, array->buffer, pos * sizeof(void *));
memcpy(
temp + pos + 1,
array->buffer + pos,
(array->count - pos) * sizeof(void *)
);
free(array->buffer);
array->buffer = temp;
array->size *= 2;
}
} else {
/* Move the elements after to the right */
memmove(
array->buffer + pos + 1, array->buffer + pos,
(array->count - pos) *sizeof(void *)
);
}
array->buffer[pos] = data;
array->count++;
}
}
void *VIV_DYNAMIC_ARRAY_remove(
VIV_DYNAMIC_ARRAY_dynamic_array *array,
unsigned int pos
) {
void *data;
if (array->count < pos + 1) {
data = NULL;
} else if (pos == 0) {
data = VIV_DYNAMIC_ARRAY_remove_head(array);
} else if (pos == array->count - 1) {
data = VIV_DYNAMIC_ARRAY_remove_tail(array);
} else {
/* unsigned int i; */
data = array->buffer[pos];
/* Move the following elements left */
memmove(
array->buffer + pos, array->buffer + pos + 1,
(array->count - pos - 1) * sizeof(void *)
);
array->count--;
}
return data;
}
void *VIV_DYNAMIC_ARRAY_get(
const VIV_DYNAMIC_ARRAY_dynamic_array *array,
unsigned int pos
) {
void *data = NULL;
if (pos < array->count) {
data = array->buffer[pos];
}
return data;
}
void *VIV_DYNAMIC_ARRAY_set(
VIV_DYNAMIC_ARRAY_dynamic_array *array,
unsigned int pos,
void *data
) {
void *temp = NULL;
if (pos == array->count) {
VIV_DYNAMIC_ARRAY_add_tail(array, data);
} else if (pos < array->count) {
temp = array->buffer[pos];
array->buffer[pos] = data;
}
return temp;
}
void VIV_DYNAMIC_ARRAY_set_size(
VIV_DYNAMIC_ARRAY_dynamic_array *array,
unsigned int size
) {
array->buffer = realloc(array->buffer, size);
if (array->buffer) {
array->size = size;
if (array->size < array->count) {
array->count = array->size;
}
} else {
array->size = 0;
array->count = 0;
}
}
void VIV_DYNAMIC_ARRAY_for_each(
const VIV_DYNAMIC_ARRAY_dynamic_array *array,
VIV_DYNAMIC_ARRAY_for_function function
) {
unsigned int i;
for (i = 0; i < array->count; ++i) {
function(array->buffer[i]);
}
}
unsigned int VIV_DYNAMIC_ARRAY_get_count(
const VIV_DYNAMIC_ARRAY_dynamic_array *array
) {
return array->count;
}
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