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/* 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';
}
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