75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
/* 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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/* vim: tabstop=4 shiftwidth=4 noexpandtab
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*
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* echo
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*
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* Prints its arguments (with some processing, ask --help)
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* to standard out.
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*/
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#include <stdio.h>
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#include <string.h>
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void usage() {
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printf("echo [-n] [-e] [STRING]...\n"
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" -n do not output a new line at the end\n"
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" -e process escape sequences\n");
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}
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int main(int argc, char ** argv) {
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int start = 1;
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int use_newline = 1;
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int process_escapes = 0;
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for (int i = start; i < argc; ++i) {
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if (argv[i][0] != '-') {
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start = i;
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break;
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} else {
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start++;
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if (argv[i][1] == 'h') {
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usage();
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return 1;
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} else if (argv[i][1] == 'n') {
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use_newline = 0;
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} else if (argv[i][1] == 'e') {
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process_escapes = 1;
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}
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}
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}
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for (int i = start; 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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