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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
static const char *const JUST_CURRENT_DIRECTORY[] = {".", NULL};
// Like readdir(3), but resets errno(3) before the call to make it easy to
// check.
static struct dirent *readdir2(DIR *const dirp)
{
errno = 0;
return readdir(dirp);
}
// Like realloc(3), but exits the binary in an out-of-memory situation.
static void *realloc2(void *ptr, const size_t size)
{
if (!(ptr = realloc(ptr, size))) {
perror("realloc");
exit(EXIT_FAILURE);
}
return ptr;
}
static void strcpy3(char *dest, const char *s1, const char *s2, const char *s3)
{
stpcpy(stpcpy(stpcpy(dest, s1), s2), s3);
}
// Walks the directory named dirname, printing the names of all files it
// contains (but not the name of the directory itself). Returns 2 if dirname is
// not a directory and 1 if another error occurs.
static int walk(const char dirname[])
{
DIR *const dir = opendir(dirname);
if (!dir) {
if (errno != ENOTDIR) {
perror(dirname);
return 1;
}
return 2;
}
int r = 0;
char *filename = NULL;
for (const struct dirent *f = readdir2(dir); f; f = readdir2(dir)) {
if (strcmp(f->d_name, ".") == 0
|| strcmp(f->d_name, "..") == 0)
continue;
filename = realloc2(filename,
strlen(dirname) + 1 + strlen(f->d_name) + 1);
strcpy3(filename, dirname, "/", f->d_name);
// TODO(bbaren): Emulate Plan 9's cleanname(3).
puts(filename);
// Walk the file if we can successfully open it as a directory.
// Don't worry about it if it's not one (walk(filename) == 2).
if ((f->d_type == DT_DIR || f->d_type == DT_UNKNOWN)
&& walk(filename) == 1)
r = 1;
}
if (errno) { // from readdir
perror(dirname);
r = 1;
}
free(filename);
if (closedir(dir)) {
perror(dirname);
r = 1;
}
return r;
}
int main(const int argc, const char *const argv[])
{
int r = 0;
const char *const *const dirs =
argc == 1 ? JUST_CURRENT_DIRECTORY : argv + 1;
for (int i = 0; dirs[i]; ++i) {
puts(dirs[i]);
r |= walk(dirs[i]);
}
return r;
}
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