Traversing a Path in c - c

Question

I am writing a program in c that takes a path name and traverses that path, and prints out all file paths it comes across and the size of that file in blocks and then if it is a dir it prints out the dir pathname and size in blocks.
The code is ending up in an infinate loop and keeps saying "Failed to get status:too many files open."
#include <dirent.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
int main( int argc, char **argv ){
struct stat statbuf;
struct dirent *direntp;
DIR *dirp;
if(stat(argv[1], &statbuf) == -1){
perror("Failed to get file status");
return 1;
}
else if(argc != 2){
perror("Invalid amount of arguments, showtreesize requires 1 pathname");
return 1;
}
else{
if(S_ISDIR(statbuf.st_mode) || S_ISREG(statbuf.st_mode)){
printf("%s %d", argv[1], depthfirstapply(argv[1], sizepathfun(argv[1])));
}
else{
if(S_ISCHR(statbuf.st_mode)){
printf("%s is a character special file.", argv[1]);
}
if(S_ISBLK(statbuf.st_mode)){
printf("%s is a block special file", argv[1]);
}
if(S_ISFIFO(statbuf.st_mode)){
printf("%s is a FIFO special file", argv[1]);
}
else{
printf("%s is not a valid filetype", argv[1]);
}
}
return 0;
}
}
int sum = 0;
int levelcount = 0;
int isDirectory(char *path){
struct stat statbuf;
if(stat(path, &statbuf) == -1)
return 0;
else
return S_ISDIR(statbuf.st_mode);
}
int depthfirstapply(char *path, int pathfun(char *path1)){
struct dirent *direntp;
DIR *dirp;
if(isDirectory(path)){
printf("%s\n", path);
if((dirp = opendir(path)) == NULL){
perror ("Failed to open directory");
return -1;
}
else{
while((direntp = readdir(dirp)) != NULL) {
if(isDirectory(direntp->d_name)){
int result = depthfirstapply(direntp->d_name, pathfun);
if (result > 0){
sum += result;
}
}
else{
if(pathfun(direntp->d_name) >= 0){
sum += pathfun(direntp->d_name);
}
}
}
while ((closedir(dirp) == -1) && (errno == EINTR)) ;
}
}
else{
sum += pathfun(path);
}
return sum;
}
int sizepathfun(char *path){
struct stat statbuf;
if(stat(path, &statbuf) == -1){
perror("Failed to get file status");
return -1;
}
if(S_ISREG(statbuf.st_mode) == 0){
return -1;
}
else{
printf("%s %d", path, statbuf.st_blocks);
return statbuf.st_blocks;
}
}

Answer 1

Several problems:
You need to skip the . and .. entries. Otherwise, you'll keep looping on the same directory.
Use lstat() rather than stat() in isDirectory. Otherwise, you'll recurse into symbolic links to directories, which could cause a loop.
As you go down each directory level, you need to concatenate the directory components to the names.
The 2nd argument to depthfirstapply is supposed to be a function. But in main() you call it with sizepathfun(argv[1)), which returns an integer. The argument should just be sizepathfun. You should be getting a compilation warning because of the type mismatch.
POSIX provides a standard set of functions for this, fts_XXX().