Created
August 28, 2015 22:09
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
typedef struct { | |
char **data; | |
size_t used; | |
size_t size; | |
} Array; | |
void initArray(Array *array, size_t initialSize); | |
void insertElement(Array *array, char *element); | |
void freeArray(Array *array); | |
void initArray(Array *array, size_t initialSize) { | |
array->data = malloc(initialSize * sizeof(char *)); | |
if (array->data == NULL) { | |
printf("ERROR: Memory allocation failure!\n"); | |
exit(1); | |
} | |
array->used = 0; | |
array->size = initialSize; | |
} | |
void insertElement(Array *array, char *element) { | |
if (array->used == array->size) { | |
void *pointer; | |
array->size *= 2; | |
pointer = realloc(array->data, array->size * sizeof(char *)); | |
if (array->data == NULL) { | |
freeArray(array); | |
printf("ERROR: Memory allocation failure!\n"); | |
exit(1); | |
} | |
array->data = pointer; | |
} | |
/* if the string passed is not NULL, copy it */ | |
if (element != NULL) { | |
size_t length; | |
length = strlen(element); | |
array->data[array->used] = malloc(1 + length); | |
if (array->data[array->used] != NULL) | |
strcpy(array->data[array->used++], element); | |
} | |
else | |
array->data[array->used++] = NULL; | |
} | |
void freeArray(Array *array) { | |
size_t i; | |
/* Free all the copies of the strings */ | |
for (i = 0; i < array->used; ++i) | |
free(array->data[i]); | |
free(array->data); | |
free(array); | |
} | |
int main(void) { | |
Array *array = NULL; | |
array = malloc(sizeof(Array)); | |
if (array == NULL) { | |
printf("Memory allocation issues\n"); | |
return -1; | |
} | |
initArray(array, 5); /* 5 lines */ | |
insertElement(array, "Test1"); | |
insertElement(array, "Test2"); | |
insertElement(array, "Test3"); | |
insertElement(array, "Test4"); | |
printf("%s\n", array->data[0]); | |
printf("%s\n", array->data[1]); | |
printf("%s\n", array->data[2]); | |
printf("%s\n", array->data[3]); | |
freeArray(array); | |
return 0; | |
} |
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