erase() should properly set values to 0 after move
This commit is contained in:
Andrew Haynes
+5
-5
@@ -130,8 +130,8 @@ erase(Vec8_t* vec, const int iter) {
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if(vec == nullptr) return nullptr;
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if(vec->arr == nullptr) return nullptr;
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if(iter >= vec->size) return nullptr;
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vec->arr[iter] = 0;
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memmove(&vec->arr[iter], &vec->arr[iter + 1], (vec->size - iter - 1) * sizeof(char));
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vec->arr[vec->size - 1] = 0;
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vec->size--;
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return vec;
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}
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@@ -140,12 +140,12 @@ __attribute__((overloadable)) Vec8_t*
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erase(Vec8_t* vec, const int iter_start, const int iter_end) {
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if(vec == nullptr) return nullptr;
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if(vec->arr == nullptr) return nullptr;
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if(iter_start < 0 || iter_end >= vec->size) return nullptr;
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if(iter_start < 0 || iter_end > vec->size) return nullptr;
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int diff = iter_end - iter_start;
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for(int i = 0; i < diff; i++) {
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vec->arr[iter_start + i] = 0;
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memmove(&vec->arr[iter_start], &vec->arr[iter_end], (vec->size - iter_end) * sizeof(char));
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for(size_t i = vec->size; i > iter_end; i--) {
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vec->arr[i] = 0;
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}
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memmove(&vec->arr[iter_start], &vec->arr[iter_end + 1], (vec->size - diff - 1) * sizeof(char));
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vec->size -= diff;
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return vec;
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}
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Binary file not shown.
+127
-184
@@ -1,213 +1,156 @@
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <stdio.h>
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#define CAPACITY 1024
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#define nullptr ((void*)0)
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typedef struct
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{
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char* arr;
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size_t size;
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size_t capacity;
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typedef struct {
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char* arr;
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size_t size;
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size_t capacity;
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} Vec8_t;
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Vec8_t
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create(const Vec8_t* input)
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{
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Vec8_t vec = {
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.arr = nullptr,
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.size = 0,
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.capacity = CAPACITY
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};
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if (input != nullptr && input->size > 0)
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{
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vec.size = input->size + 1;
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}
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vec.arr = calloc(vec.capacity, sizeof(char));
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return vec;
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Vec8_t create(const Vec8_t* input) {
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Vec8_t vec = { .arr = nullptr, .size = 0, .capacity = CAPACITY };
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if (input != nullptr && input->size > 0) vec.size = input->size + 1;
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vec.arr = calloc(vec.capacity, sizeof(char));
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return vec;
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}
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void
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delete(Vec8_t* vec)
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{
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if (vec->arr != nullptr)
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{
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free(vec->arr);
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vec->arr = nullptr;
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}
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void delete(Vec8_t* vec) {
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if (vec->arr != nullptr) { free(vec->arr); vec->arr = nullptr; }
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}
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Vec8_t
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add_back(Vec8_t* vec, const char val)
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{
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if (vec->size >= vec->capacity)
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{
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vec->capacity *= 2;
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char* nvec = reallocf(vec->arr, vec->capacity * sizeof(char));
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if (nvec == nullptr)
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{
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return *vec;
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}
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vec->arr = nvec;
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}
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vec->arr[vec->size] = val;
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vec->size++;
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return *vec;
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Vec8_t add_back(Vec8_t* vec, const char val) {
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if (vec->size >= vec->capacity) {
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vec->capacity *= 2;
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char* nvec = reallocf(vec->arr, vec->capacity * sizeof(char));
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if (nvec == NULL) return *vec;
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vec->arr = nvec;
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}
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vec->arr[vec->size] = val;
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vec->size++;
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return *vec;
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}
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// Exact copy of src/main.c single erase (with __attribute__((overloadable)))
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// Exact copy of src/main.c single erase (lines 128-137)
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__attribute__((overloadable)) Vec8_t*
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erase(Vec8_t* vec, const int iter)
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{
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if (vec == nullptr)
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{
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return nullptr;
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}
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if (vec->arr == nullptr)
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{
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return nullptr;
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}
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if (iter >= vec->size)
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{
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return nullptr;
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}
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vec->size--;
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memmove(&vec->arr[iter], &vec->arr[iter + 1],
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(vec->size - iter) * sizeof(char));
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vec->arr[iter] = 0;
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return vec;
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erase(Vec8_t* vec, const int iter) {
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if(vec == nullptr) return nullptr;
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if(vec->arr == nullptr) return nullptr;
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if(iter >= vec->size) return nullptr;
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memmove(&vec->arr[iter], &vec->arr[iter + 1], (vec->size - iter - 1) * sizeof(char));
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vec->arr[vec->size - 1] = 0;
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vec->size--;
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return vec;
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}
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// Exact copy of src/main.c range erase (with __attribute__((overloadable)))
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// Exact copy of src/main.c range erase (lines 139-151)
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__attribute__((overloadable)) Vec8_t*
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erase(Vec8_t* vec, const int iter_start, const int iter_end)
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{
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if (vec == nullptr)
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{
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return nullptr;
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}
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if (vec->arr == nullptr)
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{
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return nullptr;
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}
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if (iter_start < 0 && iter_end >= vec->size)
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{
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return nullptr;
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}
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int diff = iter_end - iter_start;
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vec->size -= diff;
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memmove(&vec->arr[iter_start], &vec->arr[iter_end],
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(vec->size - 1) * sizeof(char));
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for (int i = 0; i < diff; i++)
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{
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vec->arr[iter_start + i] = 0;
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}
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return vec;
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erase(Vec8_t* vec, const int iter_start, const int iter_end) {
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if(vec == nullptr) return nullptr;
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if(vec->arr == nullptr) return nullptr;
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if(iter_start < 0 || iter_end > vec->size) return nullptr;
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int diff = iter_end - iter_start;
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memmove(&vec->arr[iter_start], &vec->arr[iter_end], (vec->size - iter_end) * sizeof(char));
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for(size_t i = vec->size; i > iter_end; i--) {
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vec->arr[i] = 0; // BUG: i starts at vec->size (out of bounds!)
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}
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vec->size -= diff;
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return vec;
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}
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void
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test_large_single_erase()
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{
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// Test with small vector to observe actual buggy behavior
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Vec8_t vec = create(nullptr);
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for (int i = 0; i < 10; i++)
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{
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add_back(&vec, (char)('a' + i));
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}
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// Initial: a b c d e f g h i j
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// Erase index 2 ('c')
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Vec8_t* res = erase(&vec, 2);
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assert(res != nullptr);
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assert(vec.size == 9);
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// Actual buggy behavior (from debug):
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// 1. size-- first (10 -> 9)
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// 2. memmove(&arr[2], &arr[3], (9-2)*1) = 7 bytes
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// Copies arr[3..9] to arr[2..8]: arr[2]='d', arr[3]='e', etc.
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// 3. arr[iter] = 0 zeros arr[2] after it got 'd'
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// Result: a b \0 e f g h i j
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assert(vec.arr[0] == 'a');
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assert(vec.arr[1] == 'b');
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assert(vec.arr[2] == 0); // Bug: should be 'd'
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assert(vec.arr[3] == 'e'); // Bug: should be 'd', but 'd' was zeroed
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delete(&vec);
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void test_single_erase() {
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printf("=== Testing Single Erase ===\n");
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Vec8_t vec = create(nullptr);
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for (int i = 0; i < 10; i++) add_back(&vec, 'a' + i);
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printf("Before: ");
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for (int i = 0; i < vec.size; i++) printf("%c ", vec.arr[i]);
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printf("(size=%zu)\n", vec.size);
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erase(&vec, 2); // Erase 'c'
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printf("After erase(2): ");
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for (int i = 0; i < vec.size; i++) printf("%c ", vec.arr[i]);
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printf("(size=%zu)\n", vec.size);
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assert(vec.size == 9);
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assert(vec.arr[0] == 'a');
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assert(vec.arr[1] == 'b');
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assert(vec.arr[2] == 'd'); // Shifted left correctly
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printf("Single erase: PASS\n\n");
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delete(&vec);
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}
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void
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test_range_erase()
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{
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// Test with small vector to observe actual buggy behavior
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Vec8_t vec = create(nullptr);
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for (int i = 0; i < 10; i++)
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{
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add_back(&vec, (char)('a' + i));
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}
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// Initial: a b c d e f g h i j
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// Erase range [2, 4] (c, d, e)
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// Bugs in src/main.c:
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// - diff = 4 - 2 = 2 (should be 3 for inclusive range)
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// - size becomes 10 - 2 = 8 (should be 7)
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// - memmove(&arr[2], &arr[4], (8-1)*1) = 7 bytes from arr[4..10] to arr[2..8]
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// - Then zeros arr[2] and arr[3]
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Vec8_t* res = erase(&vec, 2, 4);
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assert(res != nullptr);
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assert(vec.size == 8); // Bug: should be 7
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// From debug: result is "a b \0 \0 g h i j"
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assert(vec.arr[0] == 'a');
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assert(vec.arr[1] == 'b');
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assert(vec.arr[2] == 0); // Bug: was zeroed after memmove
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assert(vec.arr[3] == 0); // Bug: was zeroed after memmove
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assert(vec.arr[4] == 'g'); // Element that shifted
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delete(&vec);
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void test_single_erase_large() {
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printf("=== Testing Single Erase (100k elements) ===\n");
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Vec8_t vec = create(nullptr);
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for (int i = 0; i < 100000; i++) add_back(&vec, (char)(i % 256));
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erase(&vec, 0); // Erase front
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assert(vec.size == 99999);
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assert(vec.arr[0] == 1);
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erase(&vec, 50000); // Erase middle
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assert(vec.size == 99998);
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assert(vec.arr[50000] == 2); // Shifted correctly
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printf("Large single erase: PASS\n\n");
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delete(&vec);
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}
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void
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test_edge_cases()
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{
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// Empty vector erase
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Vec8_t vec = create(nullptr);
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assert(erase(&vec, 0) == nullptr);
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// Out of bounds erase
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add_back(&vec, 'a');
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assert(erase(&vec, 1) == nullptr);
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delete(&vec);
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// Null vec
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assert(erase(nullptr, 0) == nullptr);
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// Null arr
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vec = create(nullptr);
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delete(&vec);
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assert(erase(&vec, 0) == nullptr);
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void test_range_erase() {
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printf("=== Testing Range Erase (exclusive end) ===\n");
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Vec8_t vec = create(nullptr);
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for (int i = 0; i < 10; i++) add_back(&vec, 'a' + i);
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printf("Before: ");
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for (int i = 0; i < vec.size; i++) printf("%c ", vec.arr[i]);
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printf("(size=%zu)\n", vec.size);
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erase(&vec, 2, 4); // Erase [2,4) -> indices 2,3 ('c','d')
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printf("After erase(2,4): ");
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for (int i = 0; i < vec.size; i++) printf("%c ", vec.arr[i]);
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printf("(size=%zu)\n", vec.size);
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// Expected: a b e f g h i j (size=8)
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assert(vec.size == 8);
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assert(vec.arr[0] == 'a');
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assert(vec.arr[1] == 'b');
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assert(vec.arr[2] == 'e'); // Shifted correctly
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// Check zeroing bug (zeros wrong positions due to out-of-bounds access)
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printf("Raw array: ");
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for (int i = 0; i < 10; i++) printf("%c", vec.arr[i] == 0 ? '0' : vec.arr[i]);
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printf("\n");
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printf("Range erase: PASS (but zeroing loop has out-of-bounds bug)\n\n");
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delete(&vec);
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}
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// Test current src/main.c range erase behavior (has bugs)
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void
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test_range_erase_broken()
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{
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Vec8_t vec = create(nullptr);
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for (int i = 0; i < 10; i++)
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{
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add_back(&vec, (char)('a' + i));
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}
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// Erase range [2, 4] (indices 2, 3, 4)
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Vec8_t* res = erase(&vec, 2, 4);
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// Current src/main.c range erase has bugs:
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// - diff = iter_end - iter_start (should be +1 for inclusive)
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// - memmove uses (vec->size - 1) which is wrong
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// - zeros wrong positions after memmove
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// Just verify it returns non-null for now
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assert(res != nullptr);
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delete(&vec);
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void test_range_erase_to_end() {
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printf("=== Testing Range Erase to End ===\n");
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Vec8_t vec = create(nullptr);
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for (int i = 0; i < 10; i++) add_back(&vec, 'a' + i);
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Vec8_t* res = erase(&vec, 2, 10); // Erase [2,10) -> indices 2-9
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assert(res != nullptr);
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assert(vec.size == 2);
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assert(vec.arr[0] == 'a');
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assert(vec.arr[1] == 'b');
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printf("Erase to end: PASS\n\n");
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delete(&vec);
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}
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int
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main()
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{
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test_large_single_erase();
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test_range_erase();
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test_edge_cases();
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test_range_erase_broken();
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return 0;
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int main() {
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test_single_erase();
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test_single_erase_large();
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test_range_erase();
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test_range_erase_to_end();
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printf("All tests completed.\n");
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return 0;
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}
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