1 /* $NetBSD: util.c,v 1.34 2011/08/29 14:44:21 joerg Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Michael Fischbein. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)util.c 8.5 (Berkeley) 4/28/95"; 39 #else 40 __RCSID("$NetBSD: util.c,v 1.34 2011/08/29 14:44:21 joerg Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/stat.h> 46 47 #include <err.h> 48 #include <fts.h> 49 #include <limits.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <vis.h> 54 #include <wchar.h> 55 #include <wctype.h> 56 57 #include "ls.h" 58 #include "extern.h" 59 60 int 61 safe_print(const char *src) 62 { 63 size_t len; 64 char *name; 65 int flags; 66 67 flags = VIS_NL | VIS_OCTAL | VIS_WHITE; 68 if (f_octal_escape) 69 flags |= VIS_CSTYLE; 70 71 len = strlen(src); 72 if (len != 0 && SIZE_T_MAX/len <= 4) { 73 errx(EXIT_FAILURE, "%s: name too long", src); 74 /* NOTREACHED */ 75 } 76 77 name = (char *)malloc(4*len+1); 78 if (name != NULL) { 79 len = strvis(name, src, flags); 80 (void)printf("%s", name); 81 free(name); 82 return len; 83 } else 84 errx(EXIT_FAILURE, "out of memory!"); 85 /* NOTREACHED */ 86 } 87 88 /* 89 * The reasons why we don't use putwchar(wc) here are: 90 * - If wc == L'\0', we need to restore the initial shift state, but 91 * the C language standard doesn't say that putwchar(L'\0') does. 92 * - It isn't portable to mix a wide-oriented function (i.e. getwchar) 93 * with byte-oriented functions (printf et al.) in same FILE. 94 */ 95 static int 96 printwc(wchar_t wc, mbstate_t *pst) 97 { 98 size_t size; 99 char buf[MB_LEN_MAX]; 100 101 size = wcrtomb(buf, wc, pst); 102 if (size == (size_t)-1) /* This shouldn't happen, but for sure */ 103 return 0; 104 if (wc == L'\0') { 105 /* The following condition must be always true, but for sure */ 106 if (size > 0 && buf[size - 1] == '\0') 107 --size; 108 } 109 if (size > 0) 110 fwrite(buf, 1, size, stdout); 111 return wc == L'\0' ? 0 : wcwidth(wc); 112 } 113 114 int 115 printescaped(const char *src) 116 { 117 int n = 0; 118 mbstate_t src_state, stdout_state; 119 /* The following +1 is to pass '\0' at the end of src to mbrtowc(). */ 120 const char *endptr = src + strlen(src) + 1; 121 122 /* 123 * We have to reset src_state each time in this function, because 124 * the codeset of src pathname may not match with current locale. 125 * Note that if we pass NULL instead of src_state to mbrtowc(), 126 * there is no way to reset the state. 127 */ 128 memset(&src_state, 0, sizeof(src_state)); 129 memset(&stdout_state, 0, sizeof(stdout_state)); 130 while (src < endptr) { 131 wchar_t wc; 132 size_t rv, span = endptr - src; 133 134 #if 0 135 /* 136 * XXX - we should fix libc instead. 137 * Theoretically this should work, but our current 138 * implementation of iso2022 module doesn't actually work 139 * as expected, if there are redundant escape sequences 140 * which exceed 32 bytes. 141 */ 142 if (span > MB_CUR_MAX) 143 span = MB_CUR_MAX; 144 #endif 145 rv = mbrtowc(&wc, src, span, &src_state); 146 if (rv == 0) { /* assert(wc == L'\0'); */ 147 /* The following may output a shift sequence. */ 148 n += printwc(wc, &stdout_state); 149 break; 150 } 151 if (rv == (size_t)-1) { /* probably errno == EILSEQ */ 152 n += printwc(L'?', &stdout_state); 153 /* try to skip 1byte, because there is no better way */ 154 src++; 155 memset(&src_state, 0, sizeof(src_state)); 156 } else if (rv == (size_t)-2) { 157 if (span < MB_CUR_MAX) { /* incomplete char */ 158 n += printwc(L'?', &stdout_state); 159 break; 160 } 161 src += span; /* a redundant shift sequence? */ 162 } else { 163 n += printwc(iswprint(wc) ? wc : L'?', &stdout_state); 164 src += rv; 165 } 166 } 167 return n; 168 } 169
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