106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
/*
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* Copyright (c) 2023 YAC
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*
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* This file is part of YAC coreutils.
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*
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* YAC coreutils is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Affero General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* YAC coreutils 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>
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#include <fcntl.h>
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#include <sysexits.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int main(int argc, char *argv[]) {
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int i = 1;
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bool u = false;
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char *usage_text = "(-u) [file...]";
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int buf_size = strlen(argv[0]) + strlen("Usage: ") + strlen(usage_text) + 3;
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char *usage = calloc(buf_size, buf_size);
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if ((
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snprintf(usage, buf_size, "Usage: %s (-u) [file...]\n", argv[0])
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) < 0 ) {}
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int opt;
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while ((opt = getopt(argc, argv, "u")) != -1) {
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switch(opt) {
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/*
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* From cat(1p):
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*
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* -u Write bytes from the input file to the standard output
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* without delay as each is read.
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*/
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case 'u':
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i = 2;
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u = true;
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break;
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default:
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break;
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}
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}
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FILE *file;
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for (; i <= (argc - 1); i++) {
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/*
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* From cat(1p):
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*
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* file A pathname of an input file. If no file operands are
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* specified, the standard input shall be used. If a file is
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* '-', the cat utility shall read from the standard input at
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* that point in the sequence. The cat utility shall not close
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* and reopen standard input when it is referenced in this way,
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* but shall accept multiple occurrences of '-' as a file
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* operand.
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*/
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printf("argv[%d]: %s\n", i, argv[i]);
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if (argv[i] == "-" || u && (argc - 1) == 1 || !u && argc == 1) {
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file = fdopen(0, "r");
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} else if ((file = fopen(argv[i], "r")) == NULL) {
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// TODO: Add error handling
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fputs(usage, stderr);
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return EX_NOINPUT;
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}
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int byte = 0;
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if (u) {
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while (byte != EOF) {
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byte = fgetc(file);
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putchar(byte);
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}
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} else {
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char *buf = calloc(1, 4096);
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while (byte != EOF) {
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byte = fgetc(file);
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fputc(byte, fdopen(1, "r"));
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}
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}
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if (fclose(file) == -1) {
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fprintf(stderr, "%s: %s: Error closing file.\n", argv[0], argv[i]);
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return EX_OSERR;
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}
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}
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return EX_OK;
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}
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