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#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
struct options
{
unsigned int skip_dots:1;
unsigned int skip_self_and_up:1;
};
struct options defaults = {
.skip_dots = 1,
.skip_self_and_up = 1,
};
int ls(const char * path, struct options opts)
{
DIR * dir;
if (NULL == (dir = opendir(path))) {
perror(path);
return 1;
}
struct dirent * entry;
while (NULL != (entry = readdir(dir))) {
const unsigned int is_dot = '.' == entry->d_name[0];
if (opts.skip_dots && is_dot)
continue;
const unsigned int is_self = is_dot && 0 == entry->d_name[1];
const unsigned int is_up = is_dot && '.' == entry->d_name[1];
if (opts.skip_self_and_up && (is_self || is_up))
continue;
printf("%s\n", entry->d_name);
}
closedir(dir);
return 0;
}
int main(int argc, char * argv[])
{
int opt;
struct options opts = defaults;
while (-1 != (opt = getopt(argc, argv, "aA"))) {
switch (opt) {
case 'a':
opts.skip_self_and_up = 0;
// fall-through
case 'A':
opts.skip_dots = 0;
break;
default:
dprintf(2, "Usage: %s [-aA] [file...]\n", argv[0]);
return 1;
}
}
int res = 0;
if (optind >= argc)
res |= ls(".", opts);
for (int i = optind; i < argc; ++i)
res |= ls(argv[i], opts);
return res;
}
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