58 lines
999 B
C
58 lines
999 B
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 2007 Denys Vlasenko
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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void FAST_FUNC fputc_printable(int ch, FILE *file)
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{
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if ((ch & (0x80 + PRINTABLE_META)) == (0x80 + PRINTABLE_META)) {
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fputs("M-", file);
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ch &= 0x7f;
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}
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ch = (unsigned char) ch;
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if (ch == 0x9b) {
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/* VT100's CSI, aka Meta-ESC, is not printable on vt-100 */
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ch = '{';
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goto print_caret;
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}
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if (ch < ' ') {
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ch += '@';
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goto print_caret;
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}
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if (ch == 0x7f) {
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ch = '?';
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print_caret:
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fputc('^', file);
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}
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fputc(ch, file);
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}
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void FAST_FUNC visible(unsigned ch, char *buf, int flags)
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{
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if (ch == '\t' && !(flags & VISIBLE_SHOW_TABS)) {
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goto raw;
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}
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if (ch == '\n') {
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if (flags & VISIBLE_ENDLINE)
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*buf++ = '$';
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} else {
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if (ch >= 128) {
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ch -= 128;
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*buf++ = 'M';
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*buf++ = '-';
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}
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if (ch < 32 || ch == 127) {
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*buf++ = '^';
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ch ^= 0x40;
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}
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}
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raw:
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*buf++ = ch;
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*buf = '\0';
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}
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