How do I loop through all files in a folder using C?

Question

I want to remove a particular substring from all the file names in a directory:

-- like \'XYZ.com\' from \'Futurama s1e20 - [XYZ.com].avi\' --

Answer 1

The key functions are _findfirst, _findnext and _findclose

struct _finddata_t file_info;
char discard[] = "XYZ.com";
char dir[256] = "c:\\folder\\";
char old_path[256];
char new_path[256];
intptr_t handle = 0;

memset(&file_info,0,sizeof(file_info));

strcpy(old_path,dir);
strcat(old_path,"*.avi");

handle = _findfirst(old_path,&file_info);
if (handle != -1)
{
    do
    {
        char *new_name = NULL;
        char *found = NULL;
        new_name = strdup(file_info.name);
        while ((found = strstr(new_name,discard)) != 0)
        {
            int pos = found - new_name;
            char* temp = (char*)malloc(strlen(new_name));
            char* remain = found+strlen(discard);
            temp[pos] = '\0';
            memcpy(temp,new_name,pos);
            strcat(temp+pos,remain);
            memcpy(new_name,temp,strlen(new_name));
            free(temp);
        }
        strcpy(old_path,dir);
        strcat(old_path,file_info.name);
        strcpy(new_path,dir);
        strcat(new_path,new_name);
        rename(old_path,new_path);
        free(new_name);
    }while(_findnext(handle,&file_info) != -1);
}
    _findclose(handle);