forked from bonsai/harakit
63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/*
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* Copyright (c) 2023 DTB <trinity@trinity.moe>
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* Copyright (c) 2023–2024 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), perror(3), stderr */
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#include <sysexits.h> /* EX_OK, EX_OSERR, EX_USAGE */
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#ifdef __OpenBSD__
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# include <unistd.h> /* pledge(2) */
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#endif
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char *program_name = "strcmp";
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int main(int argc, char *argv[]) {
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unsigned int i;
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#ifdef __OpenBSD__
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if (pledge("stdio", NULL) == -1) {
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perror(argv[0] == NULL ? program_name : argv[0]);
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return EX_OSERR;
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}
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#endif
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if (argc < 3) {
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(void)fprintf(
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stderr,
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"Usage: %s string string...\n",
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argv[0] == NULL ? program_name : argv[0]
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);
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return EX_USAGE;
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}
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for (; *argv[1] != '\0'; ++argv[1]) {
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for (i = 2; i < argc; ++i) {
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/* a former string has a greater byte value */
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if (*argv[i-1] > *argv[i]) {
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return 1;
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/* a latter string has a greater byte value */
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} else if (*argv[i-1] < *argv[i]++) {
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return -1; /* actually 255 */
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}
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}
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}
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return EX_OK;
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}
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