I’m Tryng to write a code that have to expand the memory of a malloc array of 1 for some cicles of a loop (i need to store the zeros of a function). but after compiling this error occurs: realloc(): invalid next size Aborted (core dumped) have someone an idea of the reasons of this… Read More realloc() : invalid next size Aborted (core dumped)

I’m attempting to write a PE parser, and my program contains two loops as shown below: size_t i = 0; while (condition_1) { struct _IMAGE_IMPORT_DESCRIPTOR64 *importDescriptorArray = malloc(sizeof(struct _IMAGE_IMPORT_DESCRIPTOR64)); struct _IMAGE_THUNK_DATA64 *originalFirstThunkArray = malloc(sizeof(struct _IMAGE_THUNK_DATA64)); size_t originalFirstThunkArrayIndex = 0; originalFirstThunkArray[originalFirstThunkArrayIndex].u1.ordinal = some_value; //set to a computed value while (condition_2) { originalFirstThunkArrayIndex++; originalFirstThunkArray = realloc(originalFirstThunkArray, originalFirstThunkArrayIndex… Read More Undefined Behavior on inner realloc()

I am using the editline library to get user input and hand that input to a scanner. The scanner requires any valid input to end with a newline character to unambiguously indicate the end of the last token. However, the input returned by the readline function doesn’t end with a newline character. What is the… Read More How do you add a newline to the end of a string in C?

How to shrink at runtime a struct matrix (using reallocate() for example) I have a struct matrix which I use to set a vector of size 3 with entries (1,2,3). How is it possible to shrink the size of the vector to retain the 2 first elements and remove the third one (the 3)? I… Read More How to shrink at runtime a struct matrix (using realloc() for example)

I’m trying to write a dynamic array (dynamic in size and type) in C. First I wrote a function to initialize the array. Input is a enum (TYPE) and according to value of this parameter I allocate memory for corresponding type. This is how I initialize the array: … typedef enum { CHAR, INT, FLOAT,… Read More C dynamic array interrupted by signal SIGSEGV

Someone said that using the original malloc()/calloc() pointer as the variable that holds the return value of realloc() is wrong. Here is an example: #include <stdlib.h> int main() { int *malloc_ptr = malloc(5 * sizeof(int)); malloc_ptr = realloc(malloc_ptr, 10 * sizeof(int)); return 0; } Their reasoning was that if realloc() failed it would return NULL… Read More Confusion about using malloc/calloc pointer to hold the return value of realloc

void inf_int::Sub(const char num, const unsigned int index) { if (this->length < index) { char* tmp = (char*)realloc(this->digits, index + 1); if (tmp == NULL) { cout << "Memory reallocation failed, the program will terminate." << endl; free(this->digits);// provided that the destructor does not call free itself exit(0); } this->digits = tmp; this->length = index;… Read More Realloc throws stack overflow sporadically in program that calculates large integers

When doing my project I’ve came across to a problem. I It seems like realloc is not copying all data from original array. This is what I’m dealing with (code still missing error checking, I know) : char ** dictionary = (char**) malloc(512 * sizeof(char*)); for (int i = 0; i < 256; i++) {… Read More Realloc not copying old values

I have this function split_text that takes in a char array text and attempts to split it into sub-arrays using the token as the split value, res is an array of pointers to each of the sub-strings int split_text(char * text, char * token, char ** res) { int x =0; char * tmp =… Read More Invalid write,read when allocating memory in c