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 GPL version 2, see file LICENSE in this tarball for details.
   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        static char *saved[4];
  15        static unsigned cur_saved; /* = 0 */
  16
  17        char *dst;
  18        const char *s;
  19
  20        s = str;
  21        while (1) {
  22                unsigned char c = *s;
  23                if (c == '\0') {
  24                        /* 99+% of inputs do not need conversion */
  25                        if (stats) {
  26                                stats->byte_count = (s - str);
  27                                stats->unicode_count = (s - str);
  28                                stats->unicode_width = (s - str);
  29                        }
  30                        return str;
  31                }
  32                if (c < ' ')
  33                        break;
  34                if (c >= 0x7f)
  35                        break;
  36                s++;
  37        }
  38
  39#if ENABLE_UNICODE_SUPPORT
  40        dst = unicode_conv_to_printable(stats, str);
  41#else
  42        {
  43                char *d = dst = xstrdup(str);
  44                while (1) {
  45                        unsigned char c = *d;
  46                        if (c == '\0')
  47                                break;
  48                        if (c < ' ' || c >= 0x7f)
  49                                *d = '?';
  50                        d++;
  51                }
  52                if (stats) {
  53                        stats->byte_count = (d - dst);
  54                        stats->unicode_count = (d - dst);
  55                        stats->unicode_width = (d - dst);
  56                }
  57        }
  58#endif
  59
  60        free(saved[cur_saved]);
  61        saved[cur_saved] = dst;
  62        cur_saved = (cur_saved + 1) & (ARRAY_SIZE(saved)-1);
  63
  64        return dst;
  65}
  66