LXR busybox/libbb/printable

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Unicode support routines.
   4 *
   5 * Copyright (C) 2010 Denys Vlasenko
   6 *
   7 * Licensed under GPLv2, see file LICENSE in this source tree.
   8 */
   9#include "libbb.h"
  10#include "unicode.h"
  11
  12const char* FAST_FUNC printable_string(uni_stat_t *stats, const char *str)
  13{
  14        char *dst;
  15        const char *s;
  16
  17        s = str;
  18        while (1) {
  19                unsigned char c = *s;
  20                if (c == '\0') {
  21                        /* 99+% of inputs do not need conversion */
  22                        if (stats) {
  23                                stats->byte_count = (s - str);
  24                                stats->unicode_count = (s - str);
  25                                stats->unicode_width = (s - str);
  26                        }
  27                        return str;
  28                }
  29                if (c < ' ')
  30                        break;
  31                if (c >= 0x7f)
  32                        break;
  33                s++;
  34        }
  35
  36#if ENABLE_UNICODE_SUPPORT
  37        dst = unicode_conv_to_printable(stats, str);
  38#else
  39        {
  40                char *d = dst = xstrdup(str);
  41                while (1) {
  42                        unsigned char c = *d;
  43                        if (c == '\0')
  44                                break;
  45                        if (c < ' ' || c >= 0x7f)
  46                                *d = '?';
  47                        d++;
  48                }
  49                if (stats) {
  50                        stats->byte_count = (d - dst);
  51                        stats->unicode_count = (d - dst);
  52                        stats->unicode_width = (d - dst);
  53                }
  54        }
  55#endif
  56        return auto_string(dst);
  57}
  58