/*      $NetBSD: util.c,v 1.34 2011/08/29 14:44:21 joerg Exp $  */

/*
 * Copyright (c) 1989, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Michael Fischbein.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)util.c      8.5 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: util.c,v 1.34 2011/08/29 14:44:21 joerg Exp $");
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>

#include <err.h>
#include <fts.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vis.h>
#include <wchar.h>
#include <wctype.h>

#include "ls.h"
#include "extern.h"

int
safe_print(const char *src)
{
        size_t len;
        char *name;
        int flags;

        flags = VIS_NL | VIS_OCTAL | VIS_WHITE;
        if (f_octal_escape)
                flags |= VIS_CSTYLE;

        len = strlen(src);
        if (len != 0 && SIZE_T_MAX/len <= 4) {
                errx(EXIT_FAILURE, "%s: name too long", src);
                /* NOTREACHED */
        }

        name = (char *)malloc(4*len+1);
        if (name != NULL) {
                len = strvis(name, src, flags);
                (void)printf("%s", name);
                free(name);
                return len;
        } else
                errx(EXIT_FAILURE, "out of memory!");
                /* NOTREACHED */
}

/*
 * The reasons why we don't use putwchar(wc) here are:
 * - If wc == L'\0', we need to restore the initial shift state, but
 *   the C language standard doesn't say that putwchar(L'\0') does.
 * - It isn't portable to mix a wide-oriented function (i.e. getwchar)
 *   with byte-oriented functions (printf et al.) in same FILE.
 */
static int
printwc(wchar_t wc, mbstate_t *pst)
{
        size_t size;
        char buf[MB_LEN_MAX];

        size = wcrtomb(buf, wc, pst);
        if (size == (size_t)-1) /* This shouldn't happen, but for sure */
                return 0;
        if (wc == L'\0') {
                /* The following condition must be always true, but for sure */
                if (size > 0 && buf[size - 1] == '\0')
                        --size;
        }
        if (size > 0)
                fwrite(buf, 1, size, stdout);
        return wc == L'\0' ? 0 : wcwidth(wc);
}

int
printescaped(const char *src)
{
        int n = 0;
        mbstate_t src_state, stdout_state;
        /* The following +1 is to pass '\0' at the end of src to mbrtowc(). */
        const char *endptr = src + strlen(src) + 1;

        /*
         * We have to reset src_state each time in this function, because
         * the codeset of src pathname may not match with current locale.
         * Note that if we pass NULL instead of src_state to mbrtowc(),
         * there is no way to reset the state.
         */
        memset(&src_state, 0, sizeof(src_state));
        memset(&stdout_state, 0, sizeof(stdout_state));
        while (src < endptr) {
                wchar_t wc;
                size_t rv, span = endptr - src;

#if 0
                /*
                 * XXX - we should fix libc instead.
                 * Theoretically this should work, but our current
                 * implementation of iso2022 module doesn't actually work
                 * as expected, if there are redundant escape sequences
                 * which exceed 32 bytes.
                 */
                if (span > MB_CUR_MAX)
                        span = MB_CUR_MAX;
#endif
                rv = mbrtowc(&wc, src, span, &src_state);
                if (rv == 0) { /* assert(wc == L'\0'); */
                        /* The following may output a shift sequence. */
                        n += printwc(wc, &stdout_state);
                        break;
                }
                if (rv == (size_t)-1) { /* probably errno == EILSEQ */
                        n += printwc(L'?', &stdout_state);
                        /* try to skip 1byte, because there is no better way */
                        src++;
                        memset(&src_state, 0, sizeof(src_state));
                } else if (rv == (size_t)-2) {
                        if (span < MB_CUR_MAX) { /* incomplete char */
                                n += printwc(L'?', &stdout_state);
                                break;
                        }
                        src += span; /* a redundant shift sequence? */
                } else {
                        n += printwc(iswprint(wc) ? wc : L'?', &stdout_state);
                        src += rv;
                }
        }
        return n;
}