int createPath( int index, ino_t iNodeRoot, char* path){ 30 struct stat buff; 31 int i; 32 DIR * dirp; 33 struct dirent *dp; 34 i = stat(".", &buff); 35 if(i != 0){ 36 perror("cwd error"); 37 exit(0); 38 } 39 if(iNodeRoot == buff.st_ino){ 40 /* printf("%s ", path); */ 41 return index; 42 } 43 if ((dirp = opendir("..")) == NULL) { 44 perror("couldn't open '.'"); 45 exit(0); 46 } 47 do { 48 errno = 0; 49 if ((dp = readdir(dirp)) != NULL) { 50 /* (void) printf("found %s ", dp->d_name); */ 51 if(buff.st_ino == dp->d_ino){ 52 index = prepend(index, path, dp->d_name); 53 chdir(".."); 54 index = createPath(index, iNodeRoot, path); 55 } 56 } 57 } while (dp != NULL); 58 (void) closedir(dirp); 59 return index; 60 } 61 62 int prepend(int index, char* path, char* dir){ 63 int len, plen, c; 64 len = strlen(dir); 65 if(len > index + 1){ 66 perror("path too long"); 67 return 0; 68 } 69 plen = path + strlen(path) - len; 70 71 if(plen + len + 1 > PATH_MAX){ 72 perror("path too long"); 73 return 0; 74 } 75 memmove(path + len + 1, path, plen + 1); 76 memcpy(path, dir, len); 77 path[len] = '/'; 78 /* dont copy null terminator*/ 79 /*think about / in paths*/ 80 index += len + 1; 81 return index; 82 }

I am trying to print out a path to my root directory, similar to what /bin/pwd would produce, without using the getcwd(3) command. I believe I have an issue with line 69, finding the path length, as we dont care about the first part of the string, which has been initialized to char path[PATH_MAX], we only care about the later portion where we are prepending the path string. Any help would be appreciated. all main does is call create path, and prints path at index.