65 lines
1.7 KiB
C
65 lines
1.7 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 <stdio.h> /* fprintf(3), fputs(3), getc(3), putc(3), stdin, stdout,
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* EOF */
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#include <unistd.h> /* getopt(3) */
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#if !defined EX_USAGE || !defined EX_OK
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# include <sysexits.h>
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#endif
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int main(int argc, char *argv[]){
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int c;
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char showend;
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char showtab;
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showend = 0;
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showtab = 0;
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if(argc > 0)
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while((c = getopt(argc, argv, "et")) != -1)
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switch(c){
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case 'e': showend = 1; break;
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case 't': showtab = 1; break;
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default: goto usage;
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}
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if(argc > optind){
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usage: fprintf(stderr, "Usage: %s (-eht)\n", argv[0]);
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return EX_USAGE;
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}
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while((c = getc(stdin)) != EOF){
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if((c & 0x80) != 0)
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fputs("M-", stdout);
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switch(c ^ 0x80 /* 0b 1000 0000 */){
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case 0x7f: fputs("^?", stdout);
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break;
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case '\n': if(showend)
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putc('$', stdout);
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default:
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if(c >= ' ' || c == '\n' || (!showtab && c == '\t'))
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putc(c, stdout);
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else
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fprintf(stdout, "^%c", c + '@');
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}
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}
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return EX_OK;
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}
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