108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/*
|
||
* Copyright (c) 2023–2024 DTB <trinity@trinity.moe>
|
||
* Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
|
||
* SPDX-License-Identifier: AGPL-3.0-or-later
|
||
*
|
||
* This program is free software: you can redistribute it and/or modify it under
|
||
* the terms of the GNU Affero 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 Affero General Public License for more
|
||
* details.
|
||
*
|
||
* You should have received a copy of the GNU Affero General Public License
|
||
* along with this program. If not, see https://www.gnu.org/licenses/.
|
||
*/
|
||
|
||
#include <stdio.h> /* fprintf(3), stderr, NULL */
|
||
#include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS */
|
||
#include <string.h> /* memset(3), strchr(3) */
|
||
#ifndef EX_USAGE
|
||
# include <sysexits.h>
|
||
#endif
|
||
#include <unistd.h> /* access(3), getopt(3), F_OK, R_OK, W_OK, X_OK */
|
||
#include <sys/stat.h> /* lstat(3), stat struct, S_ISBLK, S_ISCHR, S_ISDIR,
|
||
* S_ISFIFO, S_ISGID, S_ISREG, S_ISLNK, S_ISSOCK,
|
||
* S_ISUID, S_ISVTX */
|
||
|
||
static char args[] = "bcdefghkprsuwxLS";
|
||
static char ops[(sizeof args) / (sizeof *args)];
|
||
static char *program_name = "scrut";
|
||
|
||
int main(int argc, char *argv[]){
|
||
struct stat buf;
|
||
int c;
|
||
size_t i;
|
||
char *p;
|
||
|
||
if(argc < 2)
|
||
goto usage;
|
||
|
||
memset(ops, '\0', sizeof ops);
|
||
while((c = getopt(argc, argv, args)) != -1)
|
||
if((p = strchr(args, c)) == NULL)
|
||
goto usage;
|
||
else
|
||
ops[p - args] = c;
|
||
/* straighten out ops */
|
||
for(i = 0, p = ops; i < (sizeof ops) / (sizeof *ops); ++i)
|
||
if(ops[i] != '\0'){
|
||
*p = ops[i];
|
||
if(&ops[i] != p++)
|
||
ops[i] = '\0';
|
||
}
|
||
|
||
if(optind == argc)
|
||
goto usage;
|
||
|
||
argv += optind;
|
||
do{ if(access(*argv, F_OK) != 0 || lstat(*argv, &buf) == -1)
|
||
return EXIT_FAILURE; /* doesn't exist or isn't stattable */
|
||
|
||
for(i = 0; ops[i] != '\0'; ++i)
|
||
if(ops[i] == 'e')
|
||
continue;
|
||
else if(ops[i] == 'h'){
|
||
usage: fprintf(stderr, "Usage: %s [-%s] file...\n",
|
||
argv[0] == NULL
|
||
? program_name
|
||
: argv[0],
|
||
args);
|
||
|
||
return EX_USAGE;
|
||
}else if(
|
||
(ops[i] == 'b'
|
||
&& !S_ISBLK(buf.st_mode))
|
||
|| (ops[i] == 'c'
|
||
&& !S_ISCHR(buf.st_mode))
|
||
|| (ops[i] == 'd'
|
||
&& !S_ISDIR(buf.st_mode))
|
||
|| (ops[i] == 'f'
|
||
&& !S_ISREG(buf.st_mode))
|
||
|| (ops[i] == 'g'
|
||
&& !(buf.st_mode & S_ISGID))
|
||
|| (ops[i] == 'k'
|
||
&& !(buf.st_mode & S_ISVTX))
|
||
|| (ops[i] == 'p'
|
||
&& !S_ISFIFO(buf.st_mode))
|
||
|| (ops[i] == 'r'
|
||
&& access(*argv, R_OK) != 0)
|
||
|| (ops[i] == 'u'
|
||
&& !(buf.st_mode & S_ISUID))
|
||
|| (ops[i] == 'w'
|
||
&& access(*argv, W_OK) != 0)
|
||
|| (ops[i] == 'x'
|
||
&& access(*argv, X_OK) != 0)
|
||
|| (ops[i] == 'L'
|
||
&& !S_ISLNK(buf.st_mode))
|
||
|| (ops[i] == 'S'
|
||
&& !S_ISSOCK(buf.st_mode)))
|
||
return EXIT_FAILURE;
|
||
}while(*++argv != NULL);
|
||
|
||
return EXIT_SUCCESS;
|
||
}
|