Values of array of structs suddenly change (?) - c

Question

So I've been looking to this code for hours and I can't seem to understand what is happening, despite my efforts to debug this with printf's everywhere. The following function is where my main problem is:
void drawFolders() {
printf("Going to call getSubFolder\n");
getSubFolders(".");
printf("DEBUG 1 - Return from getFolderName is: %s\n", getFolderName(3));
printf("DEBUG 2 - Return from getFolderName is: %s\n", getFolderName(5));
int k;
for(k = 0; k < getNumberFolders(); k++) {
printf("DEBUG INLOOP %d - Return from getFolderName is: %s\n",k, getFolderName(k));
draw_sprite(k*60 + 30, 50, folder);
//draw_string(temp[i].name,i*60 + 30, 50);
}
}
Basically, in DEBUG1 and DEBUG2 my function getFolderName() seems to work just fine, ie, a string is returned with no problems. However, when I try to call this function inside my for loop, all I get from getFolderName is garbage (except the first one) , even when k is 3 or 5 (cases which I've tested before the for loop and worked fine). k is not wrong, as I print it too. getFolderName does nothing to the array , here is the function :
char* getFolderName(int index) {
printf("Values inside getFolderName() function : %s\n", currentFolders[index].name);
return currentFolders[index].name ;
}
Also it might be important to show what currentFolders is:
typedef struct Directories {
char* name;
int active;
} Directory;
Directory currentFolders[30];
OUTPUT
Dec 20 22:18:48 192 kernel: Vai chamar o getSubFolder
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: .
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: ..
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: usr
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: lab4
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: proj
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: bin
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: boot
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: dev
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: etc
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: home
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: mnt
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: root
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: sbin
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: tmp
Dec 20 22:18:48 192 kernel: Values inside getSubFolders function: var
Dec 20 22:18:48 192 kernel: DEBUG 0Values inside getFolderName() function : lab4
Dec 20 22:18:48 192 kernel: DEBUG 1 - Return from getFolderName is: lab4
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function : bin
Dec 20 22:18:48 192 kernel: DEBUG 2 - Return from getFolderName is: bin
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function : .
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 0 - Return from getFolderName is: .
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 1 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 2 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 3 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 4 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 5 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 6 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 7 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 8 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 9 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 10 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 11 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 12 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 13 - Return from getFolderName is:
Dec 20 22:18:48 192 kernel: Values inside getFolderName() function :
Dec 20 22:18:48 192 kernel: DEBUG INLOOP 14 - Return from getFolderName is:
Other function called that isn't related to the problem, I think, but you might want to take a look so here it is anyway:
int getSubFolders(char* foldername) {
num_folders = 0;
struct dirent *de=NULL;
DIR *d=NULL;
d=opendir(foldername);
if(d == NULL) {
perror("Couldn't open directory");
return(2);
}
int i = 0;
// Loop while not NULL
while(de = readdir(d)) {
num_folders++;
Directory temp;
currentFolders[i].name = de->d_name;
strcpy( currentFolders[i].name, de->d_name);
// printf("nome %s\n",de->d_name);
//printf("temp.name %s\n",temp.name);
// currentFolders[i] = temp;
printf("Values inside getSubFolders function: %s\n",currentFolders[i].name);
i++;
}
printCurrentFolders();
closedir(d);
return(0);
}

Answer 1

Fix it this way, the struct declare it like this
typedef struct Directories {
char name[256];
int active;
} Directory;
and remove this line
currentFolders[i].name = de->d_name;
The problem is caused by closedir(d); cleaning up resources used by opendir, the struct dirent * being part of those resources.