C Program Recursive function that searches for a given file in a given folder

C Program Recursive function that searches for a given file in a given folder

How to write a C Program to Recursive function that searches for a given file in a given folder in C Programming Language ?


Input: 
  1. Char pointer to the path folder.
  1. Char pointer to the target file name.
  1. Char pointer to the type of file to search for.
Solution:


/*
 * Recursive function that searches for a given file in a given folder.
 * input: Char pointer to the path folder.
 *        Char pointer to the target file name.
 *        Char pointer to the type of file to search for.
 */
void find_file(char* path, char* target, char typeValue){
    DIR *dir;
    struct dirent *entry;

    if (!(dir = opendir(path))){
        perror("Could not open directory.");
        return;
    }
    
    while ((entry = readdir( dir )) != NULL) {
        if ( !strcmp( entry->d_name, "."  )) continue;
        if ( !strcmp( entry->d_name, ".." )) continue;

        struct stat s;
        char fullpath[strlen(path) + strlen(entry->d_name) + 2];
        sprintf(fullpath, "%s/%s", path, entry->d_name);
        lstat(fullpath, &s);

        // If entry is a directory - add directory to list
        if (S_ISDIR(s.st_mode)) {
            addFolderToList(fullpath);
        }

        // Switch over type value, only print matches with correct type
        if (strcmp(target, entry->d_name) == 0) {
            switch (typeValue){
            case ('a'):
                    printf("%s \n", fullpath);
                    break;
            case ('d'):
                if (S_ISDIR(s.st_mode)) printf("%s \n", fullpath);
                break;
            case ('l'):
                if(S_ISLNK(s.st_mode)) printf("%s \n", fullpath);
                break;
            case ('f'):
                if(S_ISREG(s.st_mode)) printf("%s \n", fullpath);
                break;
            }
        }
    }
    closedir(dir);
}


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