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sortix--sortix/utils/stat.cpp
Jonas 'Sortie' Termansen 9d6bd9b830 Add stat(1).
2015-12-12 19:28:07 +01:00

215 lines
5.6 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2015.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
stat.cpp
Display file status.
*******************************************************************************/
#include <sys/stat.h>
#include <sys/types.h>
#include <err.h>
#include <grp.h>
#include <locale.h>
#include <pwd.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
char file_type_character(mode_t mode)
{
if ( S_ISBLK(mode) )
return 'b';
if ( S_ISCHR(mode) )
return 'c';
if ( S_ISDIR(mode) )
return 'd';
if ( S_ISFIFO(mode) )
return 'p';
if ( S_ISLNK(mode) )
return 'l';
if ( S_ISREG(mode) )
return '-';
if ( S_ISSOCK(mode) )
return 's';
return '?';
}
static void render_perms(char perms[11], mode_t mode)
{
perms[0] = file_type_character(mode);
const char flagnames[] = { 'x', 'w', 'r' };
for ( size_t i = 0; i < 9; i++ )
{
perms[9-i] = mode & 1 << i ? flagnames[i % 3] : '-';
}
if ( mode & S_ISUID )
perms[3] = mode & 0100 ? 's' : 'S';
if ( mode & S_ISGID )
perms[6] = mode & 0010 ? 's' : 'S';
if ( mode & S_ISVTX )
perms[9] = mode & 0001 ? 't' : 'T';
perms[10] = 0;
}
static void display_status(struct stat* st, const char* path)
{
printf("File: `%s'", path);
if ( S_ISLNK(st->st_mode) && (uintmax_t) st->st_size < (uintmax_t) SIZE_MAX )
{
size_t target_size = (size_t) st->st_size;
char* target = (char*) malloc(target_size + 1);
ssize_t target_read;
if ( target && 0 <= (target_read = readlink(path, target, target_size)) )
{
target[target_read] = '\0';
printf(" -> `%s'", target);
}
free(target);
}
printf("\n");
printf("Size: %" PRIiOFF "\n", st->st_size);
char perms[11];
render_perms(perms, st->st_mode);
printf("Mode: %" PRIoMODE "/%s", st->st_mode, perms);
printf("\n");
printf("Device: 0x%" PRIXDEV "\n", st->st_dev);
printf("Inode: %" PRIuINO "\n", st->st_ino);
printf("Links: %" PRIuNLINK "\n", st->st_nlink);
printf("UID: %" PRIuUID "", st->st_uid);
struct passwd* pwd = getpwuid(st->st_uid);
if ( pwd )
printf("/%s", pwd->pw_name);
printf("\n");
printf("GID: %" PRIuGID "", st->st_gid);
struct group* grp = getgrgid(st->st_gid);
if ( grp )
printf("/%s", grp->gr_name);
printf("\n");
struct tm tm;
localtime_r(&st->st_atim.tv_sec, &tm);
printf("Access: %i-%02i-%02i %02i:%02i:%02i.%09li\n",
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec, st->st_atim.tv_nsec);
localtime_r(&st->st_mtim.tv_sec, &tm);
printf("Modify: %i-%02i-%02i %02i:%02i:%02i.%09li\n",
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec, st->st_mtim.tv_nsec);
localtime_r(&st->st_ctim.tv_sec, &tm);
printf("Change: %i-%02i-%02i %02i:%02i:%02i.%09li\n",
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec, st->st_ctim.tv_nsec);
printf("Blocksize: %" PRIiBLKSIZE "\n", st->st_blksize);
printf("Blocks: %" PRIiBLKCNT "\n", st->st_blocks);
}
static void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
static void help(FILE* fp, const char* argv0)
{
fprintf(fp, "Usage: %s [OPTION]...\n", argv0);
fprintf(fp, "List processes.\n");
}
static void version(FILE* fp, const char* argv0)
{
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
}
int main(int argc, char* argv[])
{
setlocale(LC_ALL, "");
bool dereference = false;
const char* argv0 = argv[0];
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' || !arg[1] )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
{
while ( char c = *++arg ) switch ( c )
{
case 'L': dereference = true; break;
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
}
}
else if ( !strcmp(arg, "--help") )
help(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--version") )
version(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--dereference") )
dereference = true;
else
{
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
help(stderr, argv0);
exit(1);
}
}
compact_arguments(&argc, &argv);
int result = 0;
if ( argc <= 1 )
{
struct stat st;
if ( fstat(0, &st) < 0 )
err(1, "fstat: %s", "<stdin>");
display_status(&st, "<stdin>");
}
else for ( int i = 1; i < argc; i++ )
{
struct stat st;
if ( (dereference ? stat : lstat)(argv[i], &st) < 0 )
{
warn("fstat: %s", argv[i]);
result = 1;
continue;
}
display_status(&st, argv[i]);
}
return ferror(stdout) || fflush(stdout) == EOF ? 1 : result;
}