85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
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/*
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* Copyright (c) 2023 DTB <trinity@trinity.moe>
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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 <errno.h> /* errno */
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#include <stdio.h> /* fprintf(3), stderr */
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#include <stdlib.h> /* strtol(3), size_t */
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#ifndef EX_USAGE
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# include <sysexits.h> /* EX_USAGE */
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#endif
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#include <unistd.h> /* getopt(3), optind */
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/* 0b00? */ /* Equal | -e | 0b001 | 1 */
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#define EQUAL 0x01 /* Greater | -g | 0b010 | 2 */
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/* 0b0?0 */ /* Greater or Equal | -ge | 0b011 | 3 */
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#define GREATER 0x02 /* Less | -l | 0b100 | 4 */
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/* 0b?00 */ /* Less or Equal | -le | 0b101 | 5 */
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#define LESS 0x04 /* Inequal (Greater or Less) | -gl | 0b110 | 6 */
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static char *program_name = "intcmp";
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int main(int argc, char *argv[]){
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int c;
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size_t i;
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unsigned char mode;
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int r; /* reference integer */
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mode = 0;
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if(argc < 3)
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goto usage;
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while((c = getopt(argc, argv, "egl")) != -1)
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switch(c){
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case 'e': mode |= EQUAL; break;
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case 'g': mode |= GREATER; break;
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case 'l': mode |= LESS; break;
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default: goto usage;
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}
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if(optind + 2 /* ref cmp */ > argc){
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usage: fprintf(stderr,
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"Usage: %s (-eghl) [integer] [integer...]\n",
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argv[0] == NULL ? program_name : argv[0]);
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return EX_USAGE;
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}
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i = optind;
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do{ r = c;
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c = strtol(argv[i], &argv[i], 10);
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if(*argv[i] != '\0' || errno != 0){
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fprintf(stderr, "%s: argument #%d: Invalid integer\n",
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argv[0], (int)i);
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return EX_USAGE;
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}
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if(i == optind)
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continue;
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/* rule enforcement; if a mode isn't permitted and the numbers
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* correspond to it, return 1 */
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if( (!(mode & EQUAL) && r == c)
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|| (!(mode & GREATER) && r > c)
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|| (!(mode & LESS) && r < c))
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return 1;
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}while(++i < argc);
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return 0;
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}
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