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101 lines
3.3 KiB
101 lines
3.3 KiB
#include <limits.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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#include "file.h"
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/*
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BSD 3-Clause License
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Copyright (c) 2021, Ruthenic
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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static int concatFileToStdoutWithOptions(char *file, bool showLineEnds) {
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FILE *fp;
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fp = fopen(file, "r");
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if (fp == NULL) {
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printf("failed to open '%s'. perhaps the path doesn't exist?\n", file);
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exit(1);
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}
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char *contents = malloc(2);
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while (fgets(contents, 2, fp) != NULL) {
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if (showLineEnds == true && contents[0] == '\n') {
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printf("$");
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}
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printf("%s", contents);
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}
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free(contents);
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fclose(fp);
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return 0;
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}
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int cat(int argc, char **argv) {
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if (argc == 1) {
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char ch;
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while (read(STDIN_FILENO, &ch, 1) > 0) {
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printf("%c", ch);
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}
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return 0;
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} else {
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bool showLineEnds = false;
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for (int i = 1; i < argc; i++) {
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char *arg = argv[i];
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if (!strcmp(arg, "--help")) {
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char *help =
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"Drake's Epic Coreutils (working title) " DRAKECU_VERSION "\n"
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"cat - concatenate file to stdout.\n"
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"Usage:\n"
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" cat [options] [FILE]\n"
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"Available arguments:\n"
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" --help: show this help message\n"
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" --version: show the version of the "
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"program\n"
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" --show-ends, --show-line-ends, -E: print '$' at the end of "
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"lines.\n"
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"Notes:\n"
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" If no file is specified, FILE will be stdin.";
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printf("%s\n", help);
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return 0;
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} else if (!strcmp(arg, "--version")) {
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printf("%s\n", DRAKECU_VERSION);
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return 0;
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} else if (!strcmp(arg, "--show-ends") ||
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!strcmp(arg, "--show-line-ends") || !strcmp(arg, "-E")) {
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showLineEnds = true;
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} else {
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concatFileToStdoutWithOptions(arg, showLineEnds);
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}
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}
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return 0;
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}
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}
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