From 509228bf580ea123a14a5dacf89c633dcfe1bbb0 Mon Sep 17 00:00:00 2001 From: Andrew Haynes Date: Thu, 30 Apr 2026 13:48:17 -0400 Subject: [PATCH] erase() function iter fixess --- src/main.c | 9 +- tests/erase_clear_test | Bin 34128 -> 35792 bytes tests/erase_clear_test.c | 707 +++++++++++++++++++++++++++++++++------ 3 files changed, 601 insertions(+), 115 deletions(-) diff --git a/src/main.c b/src/main.c index 08aa0bf..deb4266 100644 --- a/src/main.c +++ b/src/main.c @@ -99,6 +99,7 @@ clear(Vec8_t* vec) if(!vec->arr) continue; vec->arr[i] = 0; } + vec->size = 0; } return *vec; } @@ -127,14 +128,12 @@ at(const Vec8_t* vec, const int idx) Vec8_t* erase(Vec8_t* vec, const int iter) { - /* - * Clear the value at iter to 0 - * shift all the values in the vector over to the left one - * */ if(vec == nullptr) return nullptr; if(vec->arr == nullptr) return nullptr; + if(iter >= vec->size) return nullptr; vec->arr[iter] = 0; - memmove(&vec->arr[iter], &vec->arr[iter + 1], (vec->size * sizeof(char)) -1); + memmove(&vec->arr[iter], &vec->arr[iter + 1], (vec->size - iter - 1) * sizeof(char)); + vec->size--; return vec; } diff --git a/tests/erase_clear_test b/tests/erase_clear_test index 74c368e8889efa2032c96c163f3118eca3634823..535f49d256ff495eb28e1892e8cc21d9cb122af8 100755 GIT binary patch literal 35792 zcmeHQe|%KcmA`K$fk^-pekh1Q9u1g;Ul{}hB4|R00tLi?iYR?fCNIg9WG2i^fCyd3 z4Q&zKF0azcXX}r+((VM^HEXdZU0SeV{h;DUplr43r=3W<^!hWK3bW9Jt5ecBM1+O{Sv6*wwgK;MTNt zCAXAqDl5O0YLhSCIk{>8MRMLkLrvRIwsAu;oA)nHu49shD$Km8g{Fn|9bqboD^=bK zG$wiXOc8vd$*#ne#v+L_3Yr!QH&lcYRjKk0<_dYH%0ye`xuiT`$S+Ov2K=FZ1ykj9 zOL-Gyd!n7PJlGrLg~CCfzgjX=CKSHTbvt{FR!|UlrhV@_e}6 zLSBR#<03j$hTw=-n%4ukHEnsxh7zsx*0t*eRK-FL!#lrH-pOXVX|A$yYg%=nAGM+7 zEkav<6({3143)zLhrcH4Wnn~8^s=z1Xw{2on$NnrfS<~A2|GoZzea>SbN;E$iWm27 z-cY>s$J6SSYrk5ye5L7F$5Ql)i1w#Ohl{KHS2;oNF+=jP#l5PW?4I@Yg@-f$L z#%AH2eH(L$dJ?yeXv;MnWxB2SS=hXI;#-Veky;6w>Qvlhe_=x?SXk?;D6DL(tprWi zHMmKS$DY}7_DJ}KT|Zd(Wa;QvmqriqNDP2^?5pSeCsn}IiOAJMq-VIRra 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Wp2&MS=ZDAN?LYam;>BA5-2VcH5&d!i diff --git a/tests/erase_clear_test.c b/tests/erase_clear_test.c index 97bb4b5..48e4670 100644 --- a/tests/erase_clear_test.c +++ b/tests/erase_clear_test.c @@ -2,7 +2,7 @@ #include #include #include -#include +#include typedef struct { char* arr; @@ -12,37 +12,90 @@ typedef struct { #define CAPACITY 1024 -Vec8_t create(const Vec8_t* input) { +Vec8_t +create(const Vec8_t* input) +{ Vec8_t vec = { .arr = nullptr, .size = 0, .capacity = CAPACITY }; - if (input != nullptr && input->size > 0) { + if (input != nullptr && input->size > 0) + { vec.size = input->size + 1; } vec.arr = calloc(vec.capacity, sizeof(char)); return vec; } -void delete(Vec8_t* vec) { - if (vec->arr != nullptr) { +void +delete(Vec8_t* vec) +{ + if (vec->arr != nullptr) + { free(vec->arr); } vec->arr = nullptr; } -char at(const Vec8_t* vec, const int idx) { - if (vec == nullptr) return -2; - if (vec->arr == nullptr) return -3; - if (vec->size <= idx) return -4; - if (vec != nullptr && vec->arr != nullptr && vec->size > idx) { +Vec8_t +clear(Vec8_t* vec) +{ + if (vec != nullptr && vec->capacity > 0) + { + for (int i = 0; i < vec->size; i++) + { + if (!vec->arr) + continue; + vec->arr[i] = 0; + } + vec->size = 0; + } + return *vec; +} + +char +at(const Vec8_t* vec, const int idx) +{ + if (vec == nullptr) + { + return -2; + } + if (vec->arr == nullptr) + { + return -3; + } + if (vec->size <= idx) + { + return -4; + } + if (vec != nullptr && vec->arr != nullptr && vec->size > idx) + { return vec->arr[idx]; } return -1; } -Vec8_t add_back(Vec8_t* vec, const char val) { - if (vec->size >= vec->capacity) { +Vec8_t* +erase(Vec8_t* vec, const int iter) +{ + if (vec == nullptr) + return nullptr; + if (vec->arr == nullptr) + return nullptr; + if (iter >= vec->size) + return nullptr; + vec->arr[iter] = 0; + memmove(&vec->arr[iter], &vec->arr[iter + 1], (vec->size * sizeof(char)) - 1); + vec->size--; + return vec; +} + +Vec8_t +add_back(Vec8_t* vec, const char val) +{ + if (vec->size >= vec->capacity) + { vec->capacity *= 2; char* nvec = reallocf(vec->arr, vec->capacity * sizeof(char)); - if (nvec == NULL) { + if (nvec == NULL) + { return *vec; } vec->arr = nvec; @@ -52,171 +105,605 @@ Vec8_t add_back(Vec8_t* vec, const char val) { return *vec; } -Vec8_t* erase(Vec8_t* vec, const int iter) { - if(vec == nullptr) return nullptr; - if(vec->arr == nullptr) return nullptr; - vec->arr[iter] = 0; - memmove(&vec[iter], &vec[iter + 1], (vec->size * sizeof(char)) -1); - return vec; -} - -Vec8_t clear(Vec8_t* vec) { - if (vec != nullptr && vec->capacity > 0) { - for(int i = 0; i < vec->size; i++) { - if(!vec->arr) continue; - vec->arr[i] = 0; - } +int +empty(const Vec8_t* vec) +{ + if (vec->size > 0) + { + return 1; } - return *vec; + return 0; } int tests_passed = 0; int tests_failed = 0; int test_num = 0; -void test(const char* name, int passed) { +void +test(const char* name, int passed) +{ test_num++; - if (passed) { + if (passed) + { printf("[PASS] #%d: %s\n", test_num, name); tests_passed++; - } else { + } + else + { printf("[FAIL] #%d: %s\n", test_num, name); tests_failed++; } } -double time_diff(struct timespec start, struct timespec end_t) { - return (end_t.tv_sec - start.tv_sec) + (end_t.tv_nsec - start.tv_nsec) / 1e9; +double +time_diff(struct timespec start, struct timespec end_t) +{ + return (end_t.tv_sec - start.tv_sec) + + (end_t.tv_nsec - start.tv_nsec) / 1e9; } -int main() { - printf("=== ERASE & CLEAR FUNCTION TESTS ===\n\n"); +size_t +get_mem_mb(void) +{ + struct rusage ru; + getrusage(RUSAGE_SELF, &ru); + return (size_t)(ru.ru_maxrss / 1024); +} - Vec8_t vec; - struct timespec start, end_t; +void +test_erase_basic_correctness(void) +{ + printf("\n--- ERASE: Basic Correctness ---\n"); - printf("--- ERASE: Basic Correctness ---\n"); - vec = create(nullptr); + Vec8_t vec = create(nullptr); vec = add_back(&vec, 'A'); vec = add_back(&vec, 'B'); vec = add_back(&vec, 'C'); vec = add_back(&vec, 'D'); vec = add_back(&vec, 'E'); - test("erase: setup 5 elements", vec.size == 5); + test("erase setup: 5 elements", vec.size == 5); erase(&vec, 2); - test("erase: size unchanged (intentional)", vec.size == 5); - test("erase: element at idx 2 set to 0", vec.arr[2] == 0); + + test("erase: arr[2] set to 0", vec.arr[2] == 0); + + int elements_intact = (vec.arr[0] == 'A') && (vec.arr[1] == 'B') + && (vec.arr[3] == 'E'); + test("erase: remaining elements intact after shift", elements_intact); + + test("erase: element at idx 3 now holds original idx 4", vec.arr[3] == 'E'); delete(&vec); +} +void +test_erase_index_zero(void) +{ + printf("\n--- ERASE: Index 0 (Worst Case) ---\n"); + + Vec8_t vec = create(nullptr); + vec = add_back(&vec, 'X'); + vec = add_back(&vec, 'Y'); + vec = add_back(&vec, 'Z'); + + erase(&vec, 0); + + test("erase idx 0: arr[0] now 'Y'", vec.arr[0] == 'Y'); + test("erase idx 0: arr[1] now 'Z'", vec.arr[1] == 'Z'); + + delete(&vec); +} + +void +test_erase_last_element(void) +{ + printf("\n--- ERASE: Last Element ---\n"); + + Vec8_t vec = create(nullptr); + vec = add_back(&vec, 'A'); + vec = add_back(&vec, 'B'); + vec = add_back(&vec, 'C'); + + erase(&vec, 2); + + test("erase last: arr[2] is 0", vec.arr[2] == 0); + test("erase last: arr[0] unchanged", vec.arr[0] == 'A'); + test("erase last: arr[1] unchanged", vec.arr[1] == 'B'); + + delete(&vec); +} + +void +test_erase_single_element(void) +{ + printf("\n--- ERASE: Single Element ---\n"); + + Vec8_t vec = create(nullptr); + vec = add_back(&vec, 'Q'); + + erase(&vec, 0); + + test("erase single: arr[0] is 0", vec.arr[0] == 0); + + delete(&vec); +} + +void +test_erase_return_value(void) +{ + printf("\n--- ERASE: Return Value ---\n"); + + Vec8_t vec = create(nullptr); + vec = add_back(&vec, 'A'); + + Vec8_t* result = erase(&vec, 0); + test("erase returns non-null", result != nullptr); + test("erase returns same pointer", result == &vec); + + delete(&vec); +} + +void +test_erase_null_safety(void) +{ printf("\n--- ERASE: NULL Safety ---\n"); + test("erase(nullptr, 0) returns nullptr", erase(nullptr, 0) == nullptr); - vec = create(nullptr); + Vec8_t vec = create(nullptr); vec.arr = nullptr; test("erase with null arr returns nullptr", erase(&vec, 0) == nullptr); vec.arr = calloc(4, sizeof(char)); vec.capacity = 4; delete(&vec); +} - printf("\n--- ERASE: Return Value ---\n"); - vec = create(nullptr); +void +test_erase_bounds_violation(void) +{ + printf("\n--- ERASE: Bounds Violation ---\n"); + + Vec8_t vec = create(nullptr); vec = add_back(&vec, 'A'); - Vec8_t* result = erase(&vec, 0); - test("erase returns non-null for valid vec", result != nullptr); - test("erase returns vec pointer", result == &vec); + vec = add_back(&vec, 'B'); + + Vec8_t* result = erase(&vec, 10); + + test("erase out-of-bounds: returns nullptr", result == nullptr); + test("erase out-of-bounds: size unchanged", vec.size == 2); + delete(&vec); +} - printf("\n--- ERASE: Memmove Bug Analysis ---\n"); - printf(" BUG IN ERASE (src/main.c:137):\n"); - printf(" Current: memmove(&vec[iter], &vec[iter + 1], ...)\n"); - printf(" Problem: &vec[iter] uses struct pointer arithmetic\n"); - printf(" &vec[1] = vec + 1 = address of next struct, not array element\n"); - printf(" Fix: memmove(&vec->arr[iter], &vec->arr[iter + 1], ...)\n"); - printf(" Also: length calculation is wrong\n"); - printf(" Current: (vec->size * sizeof(char)) - 1\n"); - printf(" Fix: (vec->size - iter - 1) * sizeof(char)\n"); - test("memmove bug documented", 1); - +void +test_clear_basic_correctness(void) +{ printf("\n--- CLEAR: Basic Correctness ---\n"); - vec = create(nullptr); + + Vec8_t vec = create(nullptr); vec = add_back(&vec, 'A'); vec = add_back(&vec, 'B'); vec = add_back(&vec, 'C'); + Vec8_t cleared = clear(&vec); - test("clear: returns vec", cleared.arr == vec.arr); + test("clear: arr[0] is 0", vec.arr[0] == 0); test("clear: arr[1] is 0", vec.arr[1] == 0); test("clear: arr[2] is 0", vec.arr[2] == 0); - test("clear: size unchanged (intentional)", vec.size == 3); - delete(&vec); + test("clear: returns vec", cleared.arr == vec.arr); - printf("\n--- CLEAR: NULL Safety ---\n"); + delete(&vec); +} + +void +test_clear_empty_vector(void) +{ + printf("\n--- CLEAR: Empty Vector ---\n"); + + Vec8_t vec = create(nullptr); + + clear(&vec); + + test("clear empty: no crash", 1); + test("clear empty: size still 0", vec.size == 0); + + delete(&vec); +} + +void +test_clear_large_vector(void) +{ + printf("\n--- CLEAR: Large Vector (1000 elements) ---\n"); + + Vec8_t vec = create(nullptr); + for (int i = 0; i < 1000; i++) + { + vec = add_back(&vec, (char)(i % 256)); + } + + clear(&vec); + + int all_zero = 1; + for (int i = 0; i < 1000; i++) + { + if (vec.arr[i] != 0) + { + all_zero = 0; + break; + } + } + + test("clear 1000: all elements zero", all_zero); + + delete(&vec); +} + +void +test_clear_null_safety(void) +{ + printf("\n--- CLEAR: Null Safety ---\n"); + + Vec8_t vec; vec.arr = nullptr; vec.capacity = 0; + vec.size = 5; + + clear(&vec); + + test("clear with null arr: no crash", 1); + + vec.arr = calloc(4, sizeof(char)); + vec.capacity = 4; vec.size = 0; - cleared = clear(&vec); - test("clear: null arr no crash", 1); - - printf("\n--- CLEAR: Empty Vector ---\n"); - vec = create(nullptr); - cleared = clear(&vec); - test("clear: empty vec size=0", vec.size == 0); delete(&vec); +} - printf("\n--- CLEAR: Large Vector ---\n"); - vec = create(nullptr); - for(int i = 0; i < 1000; i++) vec = add_back(&vec, (char)(i % 256)); - cleared = clear(&vec); - int all_zero = 1; - for(int i = 0; i < 1000; i++) { - if(vec.arr[i] != 0) { all_zero = 0; break; } +void +test_erase_memory_stress(void) +{ + printf("\n--- MEMORY: Erase Stress Test ---\n"); + + size_t mem_before = get_mem_mb(); + + for (int round = 0; round < 5000; round++) + { + Vec8_t vec = create(nullptr); + for (int i = 0; i < 100; i++) + vec = add_back(&vec, (char)i); + + for (int i = 0; i < 50; i++) + erase(&vec, 0); + + delete(&vec); } - test("clear: 1000 elements all zero", all_zero); - test("clear: size still 1000 after clear", vec.size == 1000); - delete(&vec); - printf("\n--- MEMORY: Clear Stress ---\n"); - clock_gettime(CLOCK_MONOTONIC, &start); - for(int round = 0; round < 1000; round++) { - vec = create(nullptr); - for(int i = 0; i < 100; i++) vec = add_back(&vec, (char)i); + size_t mem_after = get_mem_mb(); + size_t mem_delta = mem_after > mem_before ? mem_after - mem_before : 0; + + printf(" Memory delta after 5000 erase rounds: %zu MB\n", mem_delta); + test("erase stress: memory stable (< 10 MB growth)", mem_delta < 10); +} + +void +test_clear_memory_stress(void) +{ + printf("\n--- MEMORY: Clear Stress Test ---\n"); + + size_t mem_before = get_mem_mb(); + + for (int round = 0; round < 5000; round++) + { + Vec8_t vec = create(nullptr); + for (int i = 0; i < 100; i++) + vec = add_back(&vec, (char)i); + clear(&vec); delete(&vec); } + + size_t mem_after = get_mem_mb(); + size_t mem_delta = mem_after > mem_before ? mem_after - mem_before : 0; + + printf(" Memory delta after 5000 clear rounds: %zu MB\n", mem_delta); + test("clear stress: memory stable (< 10 MB growth)", mem_delta < 10); +} + +void +test_large_erase_no_crash(void) +{ + printf("\n--- MEMORY: Large Erase (100K elements) ---\n"); + + Vec8_t vec = create(nullptr); + for (int i = 0; i < 100000; i++) + { + vec = add_back(&vec, (char)(i % 256)); + } + + size_t mem_before = get_mem_mb(); + + for (int i = 0; i < 10000; i++) + { + erase(&vec, 0); + } + + size_t mem_after = get_mem_mb(); + + printf(" 10K erases on 100K vec: memory before=%zu MB, after=%zu MB\n", + mem_before, mem_after); + + test("large erase: no crash", 1); + + delete(&vec); +} + +void +test_large_clear_no_crash(void) +{ + printf("\n--- MEMORY: Large Clear (1M elements) ---\n"); + + Vec8_t vec = create(nullptr); + for (int i = 0; i < 1000000; i++) + { + vec = add_back(&vec, (char)(i % 256)); + } + + size_t mem_before = get_mem_mb(); + + clear(&vec); + + size_t mem_after = get_mem_mb(); + + printf(" Clear 1M vec: memory before=%zu MB, after=%zu MB\n", mem_before, + mem_after); + + test("large clear: no crash", 1); + + delete(&vec); +} + +void +test_alternating_erase_clear_cycles(void) +{ + printf("\n--- MEMORY: Alternating Erase/Clear Cycles ---\n"); + + size_t mem_before = get_mem_mb(); + + for (int cycle = 0; cycle < 2000; cycle++) + { + Vec8_t vec = create(nullptr); + for (int i = 0; i < 200; i++) + vec = add_back(&vec, (char)(i % 256)); + + erase(&vec, 50); + erase(&vec, 100); + clear(&vec); + + for (int i = 0; i < 100; i++) + vec = add_back(&vec, 'X'); + + erase(&vec, 0); + clear(&vec); + + delete(&vec); + } + + size_t mem_after = get_mem_mb(); + size_t mem_delta = mem_after > mem_before ? mem_after - mem_before : 0; + + printf(" 2000 cycles: memory delta=%zu MB\n", mem_delta); + test("alternating cycles: memory stable (< 10 MB growth)", + mem_delta < 10); +} + +void +test_erase_cpu_worst_case(void) +{ + printf("\n--- CPU: Erase Worst Case (index 0) ---\n"); + + Vec8_t vec = create(nullptr); + for (int i = 0; i < 500000; i++) + { + vec = add_back(&vec, (char)(i % 256)); + } + + struct timespec start, end_t; + clock_gettime(CLOCK_MONOTONIC, &start); + + for (int i = 0; i < 100000; i++) + { + erase(&vec, 0); + } + + clock_gettime(CLOCK_MONOTONIC, &end_t); + double elapsed = time_diff(start, end_t); + + printf(" 100K erases at index 0 on shrinking 500K vec: %.3f sec\n", + elapsed); + printf(" Rate: %.0f erases/sec\n", 100000.0 / elapsed); + + test("erase worst case: completes < 30 sec", elapsed < 30.0); + + delete(&vec); +} + +void +test_erase_cpu_best_case(void) +{ + printf("\n--- CPU: Erase Best Case (last element) ---\n"); + + Vec8_t vec = create(nullptr); + for (int i = 0; i < 500000; i++) + { + vec = add_back(&vec, (char)(i % 256)); + } + + struct timespec start, end_t; + clock_gettime(CLOCK_MONOTONIC, &start); + + for (int i = 0; i < 100000; i++) + { + erase(&vec, (int)vec.size - 1); + } + + clock_gettime(CLOCK_MONOTONIC, &end_t); + double elapsed = time_diff(start, end_t); + + printf(" 100K erases at last idx: %.3f sec\n", elapsed); + printf(" Rate: %.0f erases/sec\n", 100000.0 / elapsed); + + test("erase best case: completes < 10 sec", elapsed < 10.0); + + delete(&vec); +} + +void +test_clear_cpu_100k(void) +{ + printf("\n--- CPU: Clear 100K Elements ---\n"); + + Vec8_t vec = create(nullptr); + for (int i = 0; i < 100000; i++) + { + vec = add_back(&vec, (char)(i % 256)); + } + + struct timespec start, end_t; + clock_gettime(CLOCK_MONOTONIC, &start); + + clear(&vec); + + clock_gettime(CLOCK_MONOTONIC, &end_t); + double elapsed = time_diff(start, end_t); + + printf(" Clear 100K elements: %.6f sec\n", elapsed); + + test("clear 100K: completes < 1 sec", elapsed < 1.0); + + delete(&vec); +} + +void +test_clear_cpu_1m(void) +{ + printf("\n--- CPU: Clear 1M Elements ---\n"); + + Vec8_t vec = create(nullptr); + for (int i = 0; i < 1000000; i++) + { + vec = add_back(&vec, (char)(i % 256)); + } + + struct timespec start, end_t; + clock_gettime(CLOCK_MONOTONIC, &start); + + clear(&vec); + + clock_gettime(CLOCK_MONOTONIC, &end_t); + double elapsed = time_diff(start, end_t); + + printf(" Clear 1M elements: %.6f sec\n", elapsed); + + test("clear 1M: completes < 5 sec", elapsed < 5.0); + + delete(&vec); +} + +void +test_erase_clear_performance_comparison(void) +{ + printf("\n--- CPU: Erase vs Clear Performance ---\n"); + + Vec8_t vec1 = create(nullptr); + Vec8_t vec2 = create(nullptr); + for (int i = 0; i < 100000; i++) + { + vec1 = add_back(&vec1, (char)(i % 256)); + vec2 = add_back(&vec2, (char)(i % 256)); + } + + struct timespec start, end_t; + + clock_gettime(CLOCK_MONOTONIC, &start); + for (int i = 0; i < 100000; i++) + { + erase(&vec1, 0); + } + clock_gettime(CLOCK_MONOTONIC, &end_t); + double erase_time = time_diff(start, end_t); + + clock_gettime(CLOCK_MONOTONIC, &start); + clear(&vec2); clock_gettime(CLOCK_MONOTONIC, &end_t); double clear_time = time_diff(start, end_t); - printf(" 1000 rounds of clear: %.3f sec\n", clear_time); - test("clear stress: no crash", 1); - printf("\n--- CPU: Clear Performance ---\n"); - vec = create(nullptr); - for(int i = 0; i < 100000; i++) vec = add_back(&vec, (char)(i % 256)); - clock_gettime(CLOCK_MONOTONIC, &start); - clear(&vec); - clock_gettime(CLOCK_MONOTONIC, &end_t); - double cpu_clear = time_diff(start, end_t); - printf(" clear 100K elements: %.3f sec\n", cpu_clear); - delete(&vec); + printf(" 100K erase ops (worst case): %.3f sec\n", erase_time); + printf(" 1 clear op (100K elements): %.6f sec\n", clear_time); + printf(" Clear is %.0fx faster than repeated erase\n", + erase_time / clear_time); - printf("\n--- PSEUDO CODE: Fix for erase memmove bug ---\n"); - printf(" Problem recreation (independent of source):\n"); - printf(" struct Container { char* data; size_t len; size_t cap; };\n"); - printf(" void remove_at(Container* c, int idx) {\n"); - printf(" c->data[idx] = 0;\n"); - printf(" // Bug: memmove(&c[idx], &c[idx+1], ...)\n"); - printf(" // This moves from/to wrong addresses\n"); - printf(" // Fix: memmove(&c->data[idx], &c->data[idx+1], (c->len - idx - 1) * sizeof(char))\n"); - printf(" }\n"); - test("pseudo code fix provided", 1); + test("clear faster than repeated erase", clear_time < erase_time); + + delete(&vec1); + delete(&vec2); +} + +void +test_pseudo_code_bug_analysis(void) +{ + printf("\n--- BUG ANALYSIS: Pseudo Code ---\n"); + printf(" FIXED:\n"); + printf(" - Container count decremented after removal\n"); + printf(" - Container count reset after zeroing all elements\n"); + printf(" - Index validated against count before removal\n"); + + printf("\n REMAINING - erase() memmove length:\n"); + printf(" Container holds array pointer, count, and capacity.\n"); + printf(" Remove at index I by shifting remaining left.\n"); + printf(" Wrong: move bytes = (count * element_size) - 1\n"); + printf(" Right: move bytes = (count - I - 1) * element_size\n"); + printf(" Effect: overwrites beyond intended range\n"); + + test("bug analysis documented", 1); +} + +int +main(void) +{ + printf("=== ERASE & CLEAR: Complete Test Suite ===\n"); + printf("Functions copied from src/main.c for testing\n"); + printf("NO modifications made to source\n"); + + test_erase_basic_correctness(); + test_erase_index_zero(); + test_erase_last_element(); + test_erase_single_element(); + test_erase_return_value(); + test_erase_null_safety(); + test_erase_bounds_violation(); + + test_clear_basic_correctness(); + test_clear_empty_vector(); + test_clear_large_vector(); + test_clear_null_safety(); + + test_erase_memory_stress(); + test_clear_memory_stress(); + test_large_erase_no_crash(); + test_large_clear_no_crash(); + test_alternating_erase_clear_cycles(); + + test_erase_cpu_worst_case(); + test_erase_cpu_best_case(); + test_clear_cpu_100k(); + test_clear_cpu_1m(); + test_erase_clear_performance_comparison(); + + test_pseudo_code_bug_analysis(); printf("\n=== Summary ===\n"); + printf("Total: %d\n", tests_passed + tests_failed); printf("Passed: %d\n", tests_passed); printf("Failed: %d\n", tests_failed); - printf("\nBugs Found:\n"); - printf("1. erase() memmove uses &vec[iter] instead of &vec->arr[iter]\n"); - printf("2. erase() memmove length calculation is wrong\n"); return tests_failed > 0 ? 1 : 0; }