sbase/du.c

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2.6 KiB
C
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/* See LICENSE file for copyright and license details. */
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include <limits.h>
#include "util.h"
static long blksize = 512;
static char file[PATH_MAX];
static bool aflag = false;
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static bool sflag = false;
static bool kflag = false;
static long du(const char *);
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static void print(long n, char *path);
static void
usage(void)
{
eprintf("usage: %s [-a | -s] [-k] [file...]\n", argv0);
}
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static char *
xrealpath(const char *pathname, char *resolved)
{
char *r;
r = realpath(pathname, resolved);
if (!r)
eprintf("realpath: %s:");
return r;
}
int
main(int argc, char *argv[])
{
char *bsize;
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long n;
ARGBEGIN {
case 'a':
aflag = true;
break;
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case 's':
sflag = true;
break;
case 'k':
kflag = true;
break;
default:
usage();
} ARGEND;
if (aflag && sflag)
usage();
bsize = getenv("BLOCKSIZE");
if (bsize)
blksize = estrtol(bsize, 0);
if (kflag)
blksize = 1024;
if (argc < 1) {
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n = du(".");
if (sflag)
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print(n, xrealpath(".", file));
} else {
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for (; argc > 0; argc--, argv++) {
n = du(argv[0]);
if (sflag)
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print(n, xrealpath(argv[0], file));
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}
}
return EXIT_SUCCESS;
}
static void
print(long n, char *path)
{
printf("%lu\t%s\n", n, path);
}
static char *
push(const char *path)
{
char *cwd;
cwd = agetcwd();
if (chdir(path) < 0)
eprintf("chdir: %s:", path);
return cwd;
}
static void
pop(char *path)
{
if (chdir(path) < 0)
eprintf("chdir: %s:", path);
free(path);
}
static long
nblks(struct stat *st)
{
return (512 * st->st_blocks + blksize - 1) / blksize;
}
static long
du(const char *path)
{
DIR *dp;
char *cwd;
struct dirent *dent;
struct stat st;
long n = 0, m;
if (lstat(path, &st) < 0)
eprintf("stat: %s:", path);
n = nblks(&st);
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if (!S_ISDIR(st.st_mode))
goto done;
dp = opendir(path);
if (!dp) {
weprintf("opendir %s:", path);
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goto done;
}
cwd = push(path);
while ((dent = readdir(dp))) {
if (strcmp(dent->d_name, ".") == 0 ||
strcmp(dent->d_name, "..") == 0)
continue;
if (lstat(dent->d_name, &st) < 0)
eprintf("stat: %s:", dent->d_name);
if (S_ISDIR(st.st_mode)) {
n += du(dent->d_name);
continue;
}
m = nblks(&st);
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n += m;
if (aflag && !sflag) {
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if (S_ISLNK(st.st_mode)) {
if (snprintf(file, sizeof(file), "%s/%s",
cwd, dent->d_name) >= sizeof(file))
eprintf("path too long\n");
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} else {
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xrealpath(dent->d_name, file);
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}
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print(m, file);
}
}
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pop(cwd);
closedir(dp);
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done:
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if (!sflag)
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print(n, xrealpath(path, file));
return n;
}