79 lines
1.6 KiB
C
79 lines
1.6 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2013-2018 K. Lange
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*
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* echo - Print arguments to stdout.
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*
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* Prints arguments to stdout, possibly interpreting escape
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* sequences in the arguments.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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void show_usage(char * argv[]) {
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printf(
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"echo - print arguments\n"
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"\n"
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"usage: %s [-ne] ARG...\n"
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"\n"
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" -n \033[3mdo not output a new line at the end\033[0m\n"
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" -e \033[3mprocess escape sequences\033[0m\n"
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" -? \033[3mshow this help text\033[0m\n"
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"\n", argv[0]);
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}
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int main(int argc, char ** argv) {
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int use_newline = 1;
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int process_escapes = 0;
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int opt;
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while ((opt = getopt(argc, argv, "enh?")) != -1) {
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switch (opt) {
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case '?':
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case 'h':
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show_usage(argv);
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return 1;
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case 'n':
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use_newline = 0;
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break;
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case 'e':
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process_escapes = 1;
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break;
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}
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}
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for (int i = optind; i < argc; ++i) {
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if (process_escapes) {
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for (int j = 0; j < (int)strlen(argv[i]) - 1; ++j) {
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if (argv[i][j] == '\\') {
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if (argv[i][j+1] == 'e') {
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argv[i][j] = '\033';
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for (int k = j + 1; k < (int)strlen(argv[i]); ++k) {
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argv[i][k] = argv[i][k+1];
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}
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}
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if (argv[i][j+1] == 'n') {
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argv[i][j] = '\n';
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for (int k = j + 1; k < (int)strlen(argv[i]); ++k) {
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argv[i][k] = argv[i][k+1];
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}
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}
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}
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}
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}
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printf("%s",argv[i]);
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if (i != argc - 1) {
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printf(" ");
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}
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}
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if (use_newline) {
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printf("\n");
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}
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fflush(stdout);
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return 0;
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}
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