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Adding Features to malloc_playground #175

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Add features to malloc playground
lafreuxpabo Apr 9, 2024
20c6c95
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lafreuxpabo Apr 9, 2024
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94 changes: 80 additions & 14 deletions malloc_playground.c
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Original file line number Diff line number Diff line change
Expand Up @@ -21,38 +21,103 @@ void report_mcheck_fail(enum mcheck_status s)
}
#endif


#define MAX_PTR_NUM 20;

char **ptrArray;

int main(int argc, char ** argv) {

int ptrNumber = -1;
int maxPtr = MAX_PTR_NUM;
fprintf(stderr, "pid: %d\n", getpid());

ptrArray = malloc(sizeof(char*) * 20);
for (int i = 0; i < maxPtr; i++){
ptrArray[i] = 0;
}
char buffer[1000];
while (1) {
fprintf(stderr, "> ");
fgets(buffer, sizeof(buffer), stdin);
char cmd[1000];
intptr_t arg1, arg2;
int num = sscanf(buffer, "%s %"SCNiPTR" %"SCNiPTR, cmd, &arg1, &arg2);
char arg1[100] = {0};
char arg2[100] = {0};
int num = sscanf(buffer, "%s %s %s\n", cmd, arg1, arg2);
if (strcmp(cmd, "malloc") == 0) {
void* result = malloc(arg1);
fprintf(stderr, "==> %p\n", result);
int tmpArg = atoi((const char *) &arg1);
void *result = malloc(tmpArg);
ptrNumber++;
ptrArray[ptrNumber] = result;
strcpy(result, "none");
fprintf(stderr, "==> OK, %p\n", result);
} else if (strcmp(cmd, "free") == 0) {
free((void*) arg1);
fprintf(stderr, "==> ok\n");
} else if (strcmp(cmd, "show") == 0) {
if (num == 2) {
arg2 = 1;
if (num == 1){
free((void*) ptrArray[ptrNumber]);
fprintf(stderr, "==> ok\n");
ptrNumber -= 1;
}
else if (num == 2){
if (ptrNumber > -1){
int tmpArg = atoi((const char *) &arg1);
ptrArray[tmpArg] = 0;
free((void *) ptrArray[tmpArg]);
ptrNumber -= 1;
}
else{
printf("List Empty :/");
}
}
long * src = (long*) arg1;
for (int i = 0; i < arg2; i++) {
fprintf(stderr, "%p: %#16.0lx\n", &src[i], src[i]);
} else if (strcmp(cmd, "write") == 0) {
if (num == 1){
printf("write: write value [pointer index]\n");
}
else if (num == 2){
int len = strlen((const char *) &arg1);
strcpy(ptrArray[ptrNumber], (const char *) &arg1);
fprintf(stderr, "==> ok, wrote %s\n", ptrArray[ptrNumber]);
}
else if (num == 3){
int len = strlen((const char *) &arg1);
int tmpArg2 = atoi((const char *) &arg2);
if (tmpArg2 > ptrNumber){
strcpy(ptrArray[tmpArg2], (const char *) &arg1);
fprintf(stderr, "==> ok, wrote %s\n", ptrArray[tmpArg2]);
}
else{
printf("Invalid Index\n");
}
}
} else if (strcmp(cmd, "listp") == 0) {
int tmpIndex = 0;
printf("\n");
while(ptrArray[tmpIndex]){
printf("%d - %p - %s\n", tmpIndex, ptrArray[tmpIndex], ptrArray[tmpIndex]);
tmpIndex++;
}
fprintf(stderr, "==> ok\n");
} else if (strcmp(cmd, "listpall") == 0) {
int tmpIndex = 0;
printf("\n");
for (int i=0; i < maxPtr; i++){
printf("%d - %p - %s\n", tmpIndex, ptrArray[tmpIndex], ptrArray[tmpIndex]);
tmpIndex++;
}
fprintf(stderr, "==> ok\n");
} else if (strcmp(cmd, "clearArray") == 0) {
ptrNumber = -1;
for (int i = 0; i < maxPtr; i++){
free(ptrArray[i]);
ptrArray[i] = 0;
}
fprintf(stderr, "==> ok, array cleared\n");
#ifdef __GLIBC__
} else if (strcmp(cmd, "usable") == 0) {
fprintf(stderr, "usable size: %zu\n", malloc_usable_size((void*) arg1));
} else if (strcmp(cmd, "stats") == 0) {
malloc_stats();
} else if (strcmp(cmd, "info") == 0) {
malloc_info(0, stdout);
printf("Ptrptr %d\n", ptrNumber);
} else if (strcmp(cmd, "mcheck") == 0) {
fprintf(stderr, "==> %s\n", mcheck(report_mcheck_fail) == 0 ? "OK" : "ERROR");
} else if (strcmp(cmd, "mcheck_pedantic") == 0) {
Expand All @@ -66,7 +131,8 @@ int main(int argc, char ** argv) {
}
#endif
} else {
puts("Commands: malloc n, free p, show p [n], usable p, stats, info, mprobe [p], mcheck, mcheck_pedantic");
puts("Commands: malloc n, free p, usable p, stats, info, mprobe [p], mcheck, mcheck_pedantic, ");
puts("Commands: [BETA] write str, listp, listpall, clearArray\n");
}
}
}