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