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#include <dirent.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
static int do_ls(const char *dir)
{
int fd;
struct dirent *dirent;
int nbytes;
char tmpbuf[256];
stat_t sbuf;
union {
struct dirent dirent;
char buf[4096];
} lsb;
fd = open(dir, O_RDONLY, 0600);
if (fd < 0)
{
fprintf(stderr, "ls: unable to open \"%s\": errno %d\n", dir, errno);
return 1;
}
while ((nbytes = getdents(fd, &lsb.dirent, sizeof(lsb))) > 0)
{
dirent = &lsb.dirent;
if (nbytes % sizeof(struct dirent))
{
fprintf(stderr,
"ls: incorrect return value from getdents (%d):"
" not a multiple of sizeof(struct dirent) (%ld)\n",
nbytes, sizeof(struct dirent));
return 1;
}
do
{
int reclen;
int size;
snprintf(tmpbuf, sizeof(tmpbuf), "%s/%s", dir, dirent->d_name);
if (0 == stat(tmpbuf, &sbuf))
{
size = sbuf.st_size;
}
else
{
size = 0;
}
reclen = sizeof(struct dirent);
fprintf(stdout, "%7d %-20s %d\n", size, dirent->d_name,
dirent->d_ino);
dirent = (struct dirent *)(((char *)dirent) + reclen);
nbytes -= reclen;
} while (nbytes);
}
if (nbytes < 0)
{
if (errno == ENOTDIR)
{
fprintf(stdout, "%s\n", dir);
}
else
{
fprintf(stderr, "ls: couldn't list %s: errno %d\n", dir, errno);
}
}
if (close(fd) < 0)
{
fprintf(stderr, "ls: close %s: errno %d\n", dir, errno);
}
return 0;
}
int main(int argc, char **argv)
{
int ret;
if (argc < 2)
{
ret = do_ls(".");
}
else if (argc < 3)
{
ret = do_ls(argv[1]);
}
else
{
int error;
int argn;
error = 0;
for (argn = 1; argn < argc; argn++)
{
fprintf(stdout, "%s:\n", argv[argn]);
error += do_ls(argv[argn]);
fprintf(stdout, "\n");
}
ret = error;
}
return ret;
}
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