free() an array of char**

Question

I have this :

struct Library {
    char letter;
    int capacity;
    int size;
    char** words;
};
typedef struct Library Lib;

Initialize the array of Library:

void InitLibrary(Program* startup) {
    char alphabet[26] = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
    startup->dictionary = malloc(sizeof(Lib) * 26);
    int i;
    for (i = 0; i < 26; i++) {
        startup->dictionary[i].letter = alphabet[i];
        startup->dictionary[i].capacity = INIT_CAPACITY;
        startup->dictionary[i].size = 0;
        startup->dictionary[i].words = malloc(sizeof(char*) * startup->dictionary[i].capacity);
    }
}

Here i populate the array words :

void FillDicoFromFile(Program* startup){
    while((!feof(startup->f) && !ferror(startup->f))){
        char* word = malloc(sizeof(char) * 30);
        fscanf(startup->f, "%s", word);
        ToLowerCase(word);
        int indexLib = word[0] - 97;
        int sizeLib = startup->dictionary[indexLib].size;
        startup->dictionary[indexLib].words[sizeLib] = word;
        startup->dictionary[indexLib].size++;
    }
    CountTotalWords(startup);
    rewind(startup->f);
}

and a function like this :

void CleanDico(Program* startup){
    int i = 0;
    for(; i < startup->dictionary[i].size; i++){
        int j = 0;
        for(; j < startup->dictionary[i].size; i++){
            free(startup->dictionary[i].words[j]);
            startup->dictionary[i].words[j] = NULL;
        }
        startup->dictionary[i].size = 0;
    }
    startup->totalWords = 0;
}

I got the size of my array on my struct to get the limit of my array, and freed all used cells, but each time I call CleanDico, the code crashes. Any suggestions?

I've already asked a question on a problem with a char array. Now I want to free() the array. I've read plenty of posts here and there and tested a lot of solutions but none helped me to resolve my problem.

I get a SEGMENTATION_FAULT on CleanDico, and I don't have any other informations about the error. Debug mod on Code::Blocks are poor with error messages.

Answer 1

I think on your second for you meant to do

for(; j < startup->dictionary[j].size; j++){

instead of

for(; i < startup->dictionary[i].size; i++){