source: MondoRescue/branches/3.2/mindi-busybox/libbb/printable_string.c@ 3186

/* vi: set sw=4 ts=4: */
/*
 * Unicode support routines.
 *
 * Copyright (C) 2010 Denys Vlasenko
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */
#include "libbb.h"
#include "unicode.h"

const char* FAST_FUNC printable_string(uni_stat_t *stats, const char *str)
{
    static char *saved[4];
    static unsigned cur_saved; /* = 0 */

    char *dst;
    const char *s;

    s = str;
    while (1) {
        unsigned char c = *s;
        if (c == '\0') {
            /* 99+% of inputs do not need conversion */
            if (stats) {
                stats->byte_count = (s - str);
                stats->unicode_count = (s - str);
                stats->unicode_width = (s - str);
            }
            return str;
        }
        if (c < ' ')
            break;
        if (c >= 0x7f)
            break;
        s++;
    }

#if ENABLE_UNICODE_SUPPORT
    dst = unicode_conv_to_printable(stats, str);
#else
    {
        char *d = dst = xstrdup(str);
        while (1) {
            unsigned char c = *d;
            if (c == '\0')
                break;
            if (c < ' ' || c >= 0x7f)
                *d = '?';
            d++;
        }
        if (stats) {
            stats->byte_count = (d - dst);
            stats->unicode_count = (d - dst);
            stats->unicode_width = (d - dst);
        }
    }
#endif

    free(saved[cur_saved]);
    saved[cur_saved] = dst;
    cur_saved = (cur_saved + 1) & (ARRAY_SIZE(saved)-1);

    return dst;
}