LXR busybox/libbb/printable.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Utility routines.
   4 *
   5 * Copyright (C) 2007 Denys Vlasenko
   6 *
   7 * Licensed under GPLv2, see file LICENSE in this source tree.
   8 */
   9#include "libbb.h"
  10
  11void FAST_FUNC fputc_printable(int ch, FILE *file)
  12{
  13        if ((ch & (0x80 + PRINTABLE_META)) == (0x80 + PRINTABLE_META)) {
  14                fputs("M-", file);
  15                ch &= 0x7f;
  16        }
  17        ch = (unsigned char) ch;
  18        if (ch == 0x9b) {
  19                /* VT100's CSI, aka Meta-ESC, is not printable on vt-100 */
  20                ch = '{';
  21                goto print_caret;
  22        }
  23        if (ch < ' ') {
  24                ch += '@';
  25                goto print_caret;
  26        }
  27        if (ch == 0x7f) {
  28                ch = '?';
  29 print_caret:
  30                fputc('^', file);
  31        }
  32        fputc(ch, file);
  33}
  34
  35void FAST_FUNC visible(unsigned ch, char *buf, int flags)
  36{
  37        if (ch == '\t' && !(flags & VISIBLE_SHOW_TABS)) {
  38                goto raw;
  39        }
  40        if (ch == '\n') {
  41                if (flags & VISIBLE_ENDLINE)
  42                        *buf++ = '$';
  43        } else {
  44                if (ch >= 128) {
  45                        ch -= 128;
  46                        *buf++ = 'M';
  47                        *buf++ = '-';
  48                }
  49                if (ch < 32 || ch == 127) {
  50                        *buf++ = '^';
  51                        ch ^= 0x40;
  52                }
  53        }
  54 raw:
  55        *buf++ = ch;
  56        *buf = '\0';
  57}
  58