source: MondoRescue/branches/3.3/mindi-busybox/libbb/printable.c@ 3865

/* 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';
}