108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/*
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* Copyright (c) 2023–2024 DTB <trinity@trinity.moe>
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* Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*
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* This program is free software: you can redistribute it and/or modify it under
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* the terms of the GNU Affero General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see https://www.gnu.org/licenses/.
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*/
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#include <stdio.h> /* fprintf(3), stderr, NULL */
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#include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS */
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#include <string.h> /* memset(3), strchr(3) */
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#ifndef EX_USAGE
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# include <sysexits.h>
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#endif
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#include <unistd.h> /* access(3), getopt(3), F_OK, R_OK, W_OK, X_OK */
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#include <sys/stat.h> /* lstat(3), stat struct, S_ISBLK, S_ISCHR, S_ISDIR,
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* S_ISFIFO, S_ISGID, S_ISREG, S_ISLNK, S_ISSOCK,
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* S_ISUID, S_ISVTX */
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static char args[] = "bcdefghkprsuwxLS";
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static char ops[(sizeof args) / (sizeof *args)];
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static char *program_name = "scrut";
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int main(int argc, char *argv[]){
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struct stat buf;
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int c;
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size_t i;
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char *p;
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if(argc < 2)
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goto usage;
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memset(ops, '\0', sizeof ops);
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while((c = getopt(argc, argv, args)) != -1)
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if((p = strchr(args, c)) == NULL)
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goto usage;
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else
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ops[p - args] = c;
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/* straighten out ops */
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for(i = 0, p = ops; i < (sizeof ops) / (sizeof *ops); ++i)
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if(ops[i] != '\0'){
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*p = ops[i];
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if(&ops[i] != p++)
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ops[i] = '\0';
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}
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if(optind == argc)
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goto usage;
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argv += optind;
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do{ if(access(*argv, F_OK) != 0 || lstat(*argv, &buf) == -1)
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return EXIT_FAILURE; /* doesn't exist or isn't stattable */
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for(i = 0; ops[i] != '\0'; ++i)
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if(ops[i] == 'e')
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continue;
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else if(ops[i] == 'h'){
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usage: fprintf(stderr, "Usage: %s (-%s) [file...]\n",
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argv[0] == NULL
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? program_name
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: argv[0],
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args);
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return EX_USAGE;
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}else if(
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(ops[i] == 'b'
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&& !S_ISBLK(buf.st_mode))
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|| (ops[i] == 'c'
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&& !S_ISCHR(buf.st_mode))
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|| (ops[i] == 'd'
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&& !S_ISDIR(buf.st_mode))
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|| (ops[i] == 'f'
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&& !S_ISREG(buf.st_mode))
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|| (ops[i] == 'g'
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&& !(buf.st_mode & S_ISGID))
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|| (ops[i] == 'k'
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&& !(buf.st_mode & S_ISVTX))
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|| (ops[i] == 'p'
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&& !S_ISFIFO(buf.st_mode))
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|| (ops[i] == 'r'
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&& access(*argv, R_OK) != 0)
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|| (ops[i] == 'u'
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&& !(buf.st_mode & S_ISUID))
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|| (ops[i] == 'w'
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&& access(*argv, W_OK) != 0)
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|| (ops[i] == 'x'
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&& access(*argv, X_OK) != 0)
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|| (ops[i] == 'L'
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&& !S_ISLNK(buf.st_mode))
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|| (ops[i] == 'S'
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&& !S_ISSOCK(buf.st_mode)))
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return EXIT_FAILURE;
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}while(*++argv != NULL);
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return EXIT_SUCCESS;
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}
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