vis.c revision 1.60 1 1.60 joerg /* $NetBSD: vis.c,v 1.60 2013/02/21 16:21:20 joerg Exp $ */
2 1.6 cgd
3 1.1 cgd /*-
4 1.6 cgd * Copyright (c) 1989, 1993
5 1.16 wennmach * The Regents of the University of California. All rights reserved.
6 1.1 cgd *
7 1.1 cgd * Redistribution and use in source and binary forms, with or without
8 1.1 cgd * modification, are permitted provided that the following conditions
9 1.1 cgd * are met:
10 1.1 cgd * 1. Redistributions of source code must retain the above copyright
11 1.1 cgd * notice, this list of conditions and the following disclaimer.
12 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright
13 1.1 cgd * notice, this list of conditions and the following disclaimer in the
14 1.1 cgd * documentation and/or other materials provided with the distribution.
15 1.29 lukem * 3. Neither the name of the University nor the names of its contributors
16 1.1 cgd * may be used to endorse or promote products derived from this software
17 1.1 cgd * without specific prior written permission.
18 1.1 cgd *
19 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 1.1 cgd * SUCH DAMAGE.
30 1.1 cgd */
31 1.1 cgd
32 1.26 agc /*-
33 1.31 lukem * Copyright (c) 1999, 2005 The NetBSD Foundation, Inc.
34 1.30 lukem * All rights reserved.
35 1.26 agc *
36 1.26 agc * Redistribution and use in source and binary forms, with or without
37 1.26 agc * modification, are permitted provided that the following conditions
38 1.26 agc * are met:
39 1.26 agc * 1. Redistributions of source code must retain the above copyright
40 1.26 agc * notice, this list of conditions and the following disclaimer.
41 1.26 agc * 2. Redistributions in binary form must reproduce the above copyright
42 1.26 agc * notice, this list of conditions and the following disclaimer in the
43 1.26 agc * documentation and/or other materials provided with the distribution.
44 1.26 agc *
45 1.30 lukem * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
46 1.30 lukem * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
47 1.30 lukem * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
48 1.30 lukem * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
49 1.30 lukem * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
50 1.30 lukem * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
51 1.30 lukem * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
52 1.30 lukem * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
53 1.30 lukem * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
54 1.30 lukem * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
55 1.30 lukem * POSSIBILITY OF SUCH DAMAGE.
56 1.26 agc */
57 1.26 agc
58 1.7 christos #include <sys/cdefs.h>
59 1.21 tv #if defined(LIBC_SCCS) && !defined(lint)
60 1.60 joerg __RCSID("$NetBSD: vis.c,v 1.60 2013/02/21 16:21:20 joerg Exp $");
61 1.21 tv #endif /* LIBC_SCCS and not lint */
62 1.46 christos #ifdef __FBSDID
63 1.46 christos __FBSDID("$FreeBSD$");
64 1.46 christos #define _DIAGASSERT(x) assert(x)
65 1.46 christos #endif
66 1.1 cgd
67 1.8 jtc #include "namespace.h"
68 1.1 cgd #include <sys/types.h>
69 1.59 christos #include <sys/param.h>
70 1.12 lukem
71 1.12 lukem #include <assert.h>
72 1.1 cgd #include <vis.h>
73 1.44 christos #include <errno.h>
74 1.22 christos #include <stdlib.h>
75 1.46 christos #include <wchar.h>
76 1.46 christos #include <wctype.h>
77 1.8 jtc
78 1.8 jtc #ifdef __weak_alias
79 1.18 mycroft __weak_alias(strvisx,_strvisx)
80 1.20 tv #endif
81 1.20 tv
82 1.24 pooka #if !HAVE_VIS || !HAVE_SVIS
83 1.20 tv #include <ctype.h>
84 1.20 tv #include <limits.h>
85 1.20 tv #include <stdio.h>
86 1.20 tv #include <string.h>
87 1.1 cgd
88 1.47 christos /*
89 1.47 christos * The reason for going through the trouble to deal with character encodings
90 1.47 christos * in vis(3), is that we use this to safe encode output of commands. This
91 1.47 christos * safe encoding varies depending on the character set. For example if we
92 1.47 christos * display ps output in French, we don't want to display French characters
93 1.47 christos * as M-foo.
94 1.47 christos */
95 1.47 christos
96 1.48 pooka static wchar_t *do_svis(wchar_t *, wint_t, int, wint_t, const wchar_t *);
97 1.37 dsl
98 1.15 wennmach #undef BELL
99 1.46 christos #define BELL L'\a'
100 1.15 wennmach
101 1.46 christos #define iswoctal(c) (((u_char)(c)) >= L'0' && ((u_char)(c)) <= L'7')
102 1.46 christos #define iswwhite(c) (c == L' ' || c == L'\t' || c == L'\n')
103 1.46 christos #define iswsafe(c) (c == L'\b' || c == BELL || c == L'\r')
104 1.46 christos #define xtoa(c) L"0123456789abcdef"[c]
105 1.46 christos #define XTOA(c) L"0123456789ABCDEF"[c]
106 1.16 wennmach
107 1.54 christos #define MAXEXTRAS 10
108 1.15 wennmach
109 1.60 joerg #if !HAVE_NBTOOL_CONFIG_H
110 1.59 christos #ifndef __NetBSD__
111 1.57 christos /*
112 1.57 christos * On NetBSD MB_LEN_MAX is currently 32 which does not fit on any integer
113 1.57 christos * integral type and it is probably wrong, since currently the maximum
114 1.57 christos * number of bytes and character needs is 6. Until this is fixed, the
115 1.57 christos * loops below are using sizeof(uint64_t) - 1 instead of MB_LEN_MAX, and
116 1.57 christos * the assertion is commented out.
117 1.57 christos */
118 1.59 christos #ifdef __FreeBSD__
119 1.59 christos /*
120 1.59 christos * On FreeBSD including <sys/systm.h> for CTASSERT only works in kernel
121 1.59 christos * mode.
122 1.59 christos */
123 1.59 christos #ifndef CTASSERT
124 1.59 christos #define CTASSERT(x) _CTASSERT(x, __LINE__)
125 1.59 christos #define _CTASSERT(x, y) __CTASSERT(x, y)
126 1.59 christos #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
127 1.57 christos #endif
128 1.59 christos #endif /* __FreeBSD__ */
129 1.59 christos CTASSERT(MB_LEN_MAX <= sizeof(uint64_t));
130 1.59 christos #endif /* !__NetBSD__ */
131 1.60 joerg #endif
132 1.57 christos
133 1.22 christos /*
134 1.37 dsl * This is do_hvis, for HTTP style (RFC 1808)
135 1.22 christos */
136 1.46 christos static wchar_t *
137 1.54 christos do_hvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
138 1.37 dsl {
139 1.46 christos if (iswalnum(c)
140 1.41 plunky /* safe */
141 1.46 christos || c == L'$' || c == L'-' || c == L'_' || c == L'.' || c == L'+'
142 1.41 plunky /* extra */
143 1.46 christos || c == L'!' || c == L'*' || c == L'\'' || c == L'(' || c == L')'
144 1.46 christos || c == L',')
145 1.54 christos dst = do_svis(dst, c, flags, nextc, extra);
146 1.46 christos else {
147 1.46 christos *dst++ = L'%';
148 1.37 dsl *dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
149 1.37 dsl *dst++ = xtoa((unsigned int)c & 0xf);
150 1.37 dsl }
151 1.41 plunky
152 1.37 dsl return dst;
153 1.37 dsl }
154 1.27 enami
155 1.15 wennmach /*
156 1.39 christos * This is do_mvis, for Quoted-Printable MIME (RFC 2045)
157 1.39 christos * NB: No handling of long lines or CRLF.
158 1.39 christos */
159 1.46 christos static wchar_t *
160 1.54 christos do_mvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
161 1.39 christos {
162 1.46 christos if ((c != L'\n') &&
163 1.39 christos /* Space at the end of the line */
164 1.46 christos ((iswspace(c) && (nextc == L'\r' || nextc == L'\n')) ||
165 1.39 christos /* Out of range */
166 1.46 christos (!iswspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) ||
167 1.55 christos /* Specific char to be escaped */
168 1.46 christos wcschr(L"#$@[\\]^`{|}~", c) != NULL)) {
169 1.46 christos *dst++ = L'=';
170 1.39 christos *dst++ = XTOA(((unsigned int)c >> 4) & 0xf);
171 1.39 christos *dst++ = XTOA((unsigned int)c & 0xf);
172 1.46 christos } else
173 1.54 christos dst = do_svis(dst, c, flags, nextc, extra);
174 1.39 christos return dst;
175 1.39 christos }
176 1.39 christos
177 1.39 christos /*
178 1.54 christos * Output single byte of multibyte character.
179 1.15 wennmach */
180 1.46 christos static wchar_t *
181 1.54 christos do_mbyte(wchar_t *dst, wint_t c, int flags, wint_t nextc, int iswextra)
182 1.37 dsl {
183 1.54 christos if (flags & VIS_CSTYLE) {
184 1.37 dsl switch (c) {
185 1.46 christos case L'\n':
186 1.46 christos *dst++ = L'\\'; *dst++ = L'n';
187 1.37 dsl return dst;
188 1.46 christos case L'\r':
189 1.46 christos *dst++ = L'\\'; *dst++ = L'r';
190 1.37 dsl return dst;
191 1.46 christos case L'\b':
192 1.46 christos *dst++ = L'\\'; *dst++ = L'b';
193 1.37 dsl return dst;
194 1.37 dsl case BELL:
195 1.46 christos *dst++ = L'\\'; *dst++ = L'a';
196 1.37 dsl return dst;
197 1.46 christos case L'\v':
198 1.46 christos *dst++ = L'\\'; *dst++ = L'v';
199 1.37 dsl return dst;
200 1.46 christos case L'\t':
201 1.46 christos *dst++ = L'\\'; *dst++ = L't';
202 1.37 dsl return dst;
203 1.46 christos case L'\f':
204 1.46 christos *dst++ = L'\\'; *dst++ = L'f';
205 1.37 dsl return dst;
206 1.46 christos case L' ':
207 1.46 christos *dst++ = L'\\'; *dst++ = L's';
208 1.37 dsl return dst;
209 1.46 christos case L'\0':
210 1.46 christos *dst++ = L'\\'; *dst++ = L'0';
211 1.46 christos if (iswoctal(nextc)) {
212 1.46 christos *dst++ = L'0';
213 1.46 christos *dst++ = L'0';
214 1.37 dsl }
215 1.37 dsl return dst;
216 1.37 dsl default:
217 1.46 christos if (iswgraph(c)) {
218 1.46 christos *dst++ = L'\\';
219 1.46 christos *dst++ = c;
220 1.37 dsl return dst;
221 1.37 dsl }
222 1.37 dsl }
223 1.37 dsl }
224 1.54 christos if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) {
225 1.46 christos *dst++ = L'\\';
226 1.46 christos *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + L'0';
227 1.46 christos *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + L'0';
228 1.46 christos *dst++ = (c & 07) + L'0';
229 1.37 dsl } else {
230 1.54 christos if ((flags & VIS_NOSLASH) == 0)
231 1.46 christos *dst++ = L'\\';
232 1.55 christos
233 1.37 dsl if (c & 0200) {
234 1.46 christos c &= 0177;
235 1.46 christos *dst++ = L'M';
236 1.37 dsl }
237 1.55 christos
238 1.46 christos if (iswcntrl(c)) {
239 1.46 christos *dst++ = L'^';
240 1.37 dsl if (c == 0177)
241 1.46 christos *dst++ = L'?';
242 1.37 dsl else
243 1.46 christos *dst++ = c + L'@';
244 1.37 dsl } else {
245 1.46 christos *dst++ = L'-';
246 1.46 christos *dst++ = c;
247 1.37 dsl }
248 1.37 dsl }
249 1.54 christos
250 1.54 christos return dst;
251 1.54 christos }
252 1.54 christos
253 1.54 christos /*
254 1.54 christos * This is do_vis, the central code of vis.
255 1.54 christos * dst: Pointer to the destination buffer
256 1.54 christos * c: Character to encode
257 1.59 christos * flags: Flags word
258 1.54 christos * nextc: The character following 'c'
259 1.54 christos * extra: Pointer to the list of extra characters to be
260 1.54 christos * backslash-protected.
261 1.54 christos */
262 1.54 christos static wchar_t *
263 1.54 christos do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
264 1.54 christos {
265 1.54 christos int iswextra, i, shft;
266 1.57 christos uint64_t bmsk, wmsk;
267 1.54 christos
268 1.54 christos iswextra = wcschr(extra, c) != NULL;
269 1.54 christos if (!iswextra && (iswgraph(c) || iswwhite(c) ||
270 1.54 christos ((flags & VIS_SAFE) && iswsafe(c)))) {
271 1.54 christos *dst++ = c;
272 1.54 christos return dst;
273 1.54 christos }
274 1.54 christos
275 1.54 christos /* See comment in istrsenvisx() output loop, below. */
276 1.54 christos wmsk = 0;
277 1.59 christos for (i = sizeof(wmsk) - 1; i >= 0; i--) {
278 1.54 christos shft = i * NBBY;
279 1.59 christos bmsk = (uint64_t)0xffLL << shft;
280 1.54 christos wmsk |= bmsk;
281 1.54 christos if ((c & wmsk) || i == 0)
282 1.54 christos dst = do_mbyte(dst, (wint_t)(
283 1.59 christos (uint64_t)(c & bmsk) >> shft),
284 1.54 christos flags, nextc, iswextra);
285 1.54 christos }
286 1.54 christos
287 1.37 dsl return dst;
288 1.37 dsl }
289 1.15 wennmach
290 1.46 christos typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *);
291 1.39 christos
292 1.39 christos /*
293 1.39 christos * Return the appropriate encoding function depending on the flags given.
294 1.39 christos */
295 1.39 christos static visfun_t
296 1.54 christos getvisfun(int flags)
297 1.39 christos {
298 1.54 christos if (flags & VIS_HTTPSTYLE)
299 1.39 christos return do_hvis;
300 1.54 christos if (flags & VIS_MIMESTYLE)
301 1.39 christos return do_mvis;
302 1.39 christos return do_svis;
303 1.39 christos }
304 1.15 wennmach
305 1.15 wennmach /*
306 1.54 christos * Expand list of extra characters to not visually encode.
307 1.54 christos */
308 1.54 christos static wchar_t *
309 1.54 christos makeextralist(int flags, const char *src)
310 1.54 christos {
311 1.54 christos wchar_t *dst, *d;
312 1.54 christos size_t len;
313 1.54 christos
314 1.54 christos len = strlen(src);
315 1.54 christos if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL)
316 1.54 christos return NULL;
317 1.54 christos
318 1.54 christos if (mbstowcs(dst, src, len) == (size_t)-1) {
319 1.58 tron size_t i;
320 1.58 tron for (i = 0; i < len; i++)
321 1.54 christos dst[i] = (wint_t)(u_char)src[i];
322 1.54 christos d = dst + len;
323 1.54 christos } else
324 1.54 christos d = dst + wcslen(dst);
325 1.54 christos
326 1.54 christos if (flags & VIS_GLOB) {
327 1.54 christos *d++ = L'*';
328 1.54 christos *d++ = L'?';
329 1.54 christos *d++ = L'[';
330 1.54 christos *d++ = L'#';
331 1.54 christos }
332 1.54 christos
333 1.55 christos if (flags & VIS_SP) *d++ = L' ';
334 1.55 christos if (flags & VIS_TAB) *d++ = L'\t';
335 1.54 christos if (flags & VIS_NL) *d++ = L'\n';
336 1.54 christos if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\';
337 1.54 christos *d = L'\0';
338 1.54 christos
339 1.54 christos return dst;
340 1.54 christos }
341 1.54 christos
342 1.54 christos /*
343 1.54 christos * istrsenvisx()
344 1.46 christos * The main internal function.
345 1.46 christos * All user-visible functions call this one.
346 1.15 wennmach */
347 1.46 christos static int
348 1.54 christos istrsenvisx(char *mbdst, size_t *dlen, const char *mbsrc, size_t mblength,
349 1.54 christos int flags, const char *mbextra, int *cerr_ptr)
350 1.15 wennmach {
351 1.54 christos wchar_t *dst, *src, *pdst, *psrc, *start, *extra;
352 1.50 christos size_t len, olen;
353 1.57 christos uint64_t bmsk, wmsk;
354 1.57 christos wint_t c;
355 1.39 christos visfun_t f;
356 1.56 riz int clen = 0, cerr = 0, error = -1, i, shft;
357 1.54 christos ssize_t mbslength, maxolen;
358 1.46 christos
359 1.46 christos _DIAGASSERT(mbdst != NULL);
360 1.46 christos _DIAGASSERT(mbsrc != NULL);
361 1.46 christos _DIAGASSERT(mbextra != NULL);
362 1.46 christos
363 1.53 christos /*
364 1.53 christos * Input (mbsrc) is a char string considered to be multibyte
365 1.53 christos * characters. The input loop will read this string pulling
366 1.53 christos * one character, possibly multiple bytes, from mbsrc and
367 1.53 christos * converting each to wchar_t in src.
368 1.53 christos *
369 1.53 christos * The vis conversion will be done using the wide char
370 1.53 christos * wchar_t string.
371 1.53 christos *
372 1.53 christos * This will then be converted back to a multibyte string to
373 1.53 christos * return to the caller.
374 1.53 christos */
375 1.53 christos
376 1.53 christos /* Allocate space for the wide char strings */
377 1.54 christos psrc = pdst = extra = NULL;
378 1.46 christos if (!mblength)
379 1.46 christos mblength = strlen(mbsrc);
380 1.46 christos if ((psrc = calloc(mblength + 1, sizeof(*psrc))) == NULL)
381 1.46 christos return -1;
382 1.46 christos if ((pdst = calloc((4 * mblength) + 1, sizeof(*pdst))) == NULL)
383 1.46 christos goto out;
384 1.46 christos dst = pdst;
385 1.46 christos src = psrc;
386 1.46 christos
387 1.59 christos /* Use caller's multibyte conversion error flag. */
388 1.54 christos if (cerr_ptr)
389 1.54 christos cerr = *cerr_ptr;
390 1.54 christos
391 1.53 christos /*
392 1.53 christos * Input loop.
393 1.53 christos * Handle up to mblength characters (not bytes). We do not
394 1.53 christos * stop at NULs because we may be processing a block of data
395 1.54 christos * that includes NULs.
396 1.53 christos */
397 1.50 christos mbslength = (ssize_t)mblength;
398 1.53 christos /*
399 1.53 christos * When inputing a single character, must also read in the
400 1.53 christos * next character for nextc, the look-ahead character.
401 1.53 christos */
402 1.53 christos if (mbslength == 1)
403 1.53 christos mbslength++;
404 1.53 christos while (mbslength > 0) {
405 1.53 christos /* Convert one multibyte character to wchar_t. */
406 1.54 christos if (!cerr)
407 1.54 christos clen = mbtowc(src, mbsrc, MB_LEN_MAX);
408 1.54 christos if (cerr || clen < 0) {
409 1.53 christos /* Conversion error, process as a byte instead. */
410 1.54 christos *src = (wint_t)(u_char)*mbsrc;
411 1.50 christos clen = 1;
412 1.54 christos cerr = 1;
413 1.51 christos }
414 1.50 christos if (clen == 0)
415 1.53 christos /*
416 1.53 christos * NUL in input gives 0 return value. process
417 1.54 christos * as single NUL byte and keep going.
418 1.53 christos */
419 1.50 christos clen = 1;
420 1.54 christos /* Advance buffer character pointer. */
421 1.50 christos src++;
422 1.53 christos /* Advance input pointer by number of bytes read. */
423 1.50 christos mbsrc += clen;
424 1.54 christos /* Decrement input byte count. */
425 1.50 christos mbslength -= clen;
426 1.46 christos }
427 1.55 christos len = src - psrc;
428 1.50 christos src = psrc;
429 1.53 christos /*
430 1.53 christos * In the single character input case, we will have actually
431 1.53 christos * processed two characters, c and nextc. Reset len back to
432 1.53 christos * just a single character.
433 1.53 christos */
434 1.53 christos if (mblength < len)
435 1.53 christos len = mblength;
436 1.46 christos
437 1.53 christos /* Convert extra argument to list of characters for this mode. */
438 1.54 christos extra = makeextralist(flags, mbextra);
439 1.54 christos if (!extra) {
440 1.44 christos if (dlen && *dlen == 0) {
441 1.44 christos errno = ENOSPC;
442 1.46 christos goto out;
443 1.44 christos }
444 1.54 christos *mbdst = '\0'; /* can't create extra, return "" */
445 1.46 christos error = 0;
446 1.46 christos goto out;
447 1.31 lukem }
448 1.46 christos
449 1.53 christos /* Look up which processing function to call. */
450 1.54 christos f = getvisfun(flags);
451 1.46 christos
452 1.53 christos /*
453 1.53 christos * Main processing loop.
454 1.53 christos * Call do_Xvis processing function one character at a time
455 1.53 christos * with next character available for look-ahead.
456 1.53 christos */
457 1.46 christos for (start = dst; len > 0; len--) {
458 1.46 christos c = *src++;
459 1.54 christos dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra);
460 1.46 christos if (dst == NULL) {
461 1.46 christos errno = ENOSPC;
462 1.46 christos goto out;
463 1.46 christos }
464 1.46 christos }
465 1.46 christos
466 1.54 christos /* Terminate the string in the buffer. */
467 1.54 christos *dst = L'\0';
468 1.54 christos
469 1.54 christos /*
470 1.54 christos * Output loop.
471 1.54 christos * Convert wchar_t string back to multibyte output string.
472 1.54 christos * If we have hit a multi-byte conversion error on input,
473 1.54 christos * output byte-by-byte here. Else use wctomb().
474 1.54 christos */
475 1.54 christos len = wcslen(start);
476 1.54 christos maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1);
477 1.54 christos olen = 0;
478 1.54 christos for (dst = start; len > 0; len--) {
479 1.54 christos if (!cerr)
480 1.54 christos clen = wctomb(mbdst, *dst);
481 1.54 christos if (cerr || clen < 0) {
482 1.54 christos /*
483 1.54 christos * Conversion error, process as a byte(s) instead.
484 1.54 christos * Examine each byte and higher-order bytes for
485 1.55 christos * data. E.g.,
486 1.59 christos * 0x000000000000a264 -> a2 64
487 1.59 christos * 0x000000001f00a264 -> 1f 00 a2 64
488 1.54 christos */
489 1.54 christos clen = 0;
490 1.54 christos wmsk = 0;
491 1.59 christos for (i = sizeof(wmsk) - 1; i >= 0; i--) {
492 1.54 christos shft = i * NBBY;
493 1.59 christos bmsk = (uint64_t)0xffLL << shft;
494 1.54 christos wmsk |= bmsk;
495 1.54 christos if ((*dst & wmsk) || i == 0)
496 1.59 christos mbdst[clen++] = (char)(
497 1.59 christos (uint64_t)(*dst & bmsk) >>
498 1.59 christos shft);
499 1.54 christos }
500 1.54 christos cerr = 1;
501 1.54 christos }
502 1.54 christos /* If this character would exceed our output limit, stop. */
503 1.54 christos if (olen + clen > (size_t)maxolen)
504 1.54 christos break;
505 1.54 christos /* Advance output pointer by number of bytes written. */
506 1.54 christos mbdst += clen;
507 1.54 christos /* Advance buffer character pointer. */
508 1.54 christos dst++;
509 1.54 christos /* Incrment output character count. */
510 1.54 christos olen += clen;
511 1.54 christos }
512 1.54 christos
513 1.53 christos /* Terminate the output string. */
514 1.54 christos *mbdst = '\0';
515 1.46 christos
516 1.59 christos /* Pass conversion error flag out. */
517 1.54 christos if (cerr_ptr)
518 1.54 christos *cerr_ptr = cerr;
519 1.46 christos
520 1.46 christos free(extra);
521 1.46 christos free(pdst);
522 1.46 christos free(psrc);
523 1.46 christos
524 1.46 christos return (int)olen;
525 1.46 christos out:
526 1.46 christos free(extra);
527 1.46 christos free(pdst);
528 1.46 christos free(psrc);
529 1.46 christos return error;
530 1.15 wennmach }
531 1.46 christos #endif
532 1.46 christos
533 1.46 christos #if !HAVE_SVIS
534 1.46 christos /*
535 1.46 christos * The "svis" variants all take an "extra" arg that is a pointer
536 1.46 christos * to a NUL-terminated list of characters to be encoded, too.
537 1.46 christos * These functions are useful e. g. to encode strings in such a
538 1.46 christos * way so that they are not interpreted by a shell.
539 1.46 christos */
540 1.15 wennmach
541 1.44 christos char *
542 1.54 christos svis(char *mbdst, int c, int flags, int nextc, const char *mbextra)
543 1.44 christos {
544 1.46 christos char cc[2];
545 1.46 christos int ret;
546 1.46 christos
547 1.46 christos cc[0] = c;
548 1.46 christos cc[1] = nextc;
549 1.46 christos
550 1.54 christos ret = istrsenvisx(mbdst, NULL, cc, 1, flags, mbextra, NULL);
551 1.46 christos if (ret < 0)
552 1.46 christos return NULL;
553 1.46 christos return mbdst + ret;
554 1.44 christos }
555 1.44 christos
556 1.44 christos char *
557 1.54 christos snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra)
558 1.44 christos {
559 1.46 christos char cc[2];
560 1.46 christos int ret;
561 1.44 christos
562 1.46 christos cc[0] = c;
563 1.46 christos cc[1] = nextc;
564 1.15 wennmach
565 1.54 christos ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, mbextra, NULL);
566 1.46 christos if (ret < 0)
567 1.46 christos return NULL;
568 1.46 christos return mbdst + ret;
569 1.15 wennmach }
570 1.15 wennmach
571 1.44 christos int
572 1.54 christos strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra)
573 1.44 christos {
574 1.54 christos return istrsenvisx(mbdst, NULL, mbsrc, 0, flags, mbextra, NULL);
575 1.44 christos }
576 1.15 wennmach
577 1.15 wennmach int
578 1.54 christos strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra)
579 1.44 christos {
580 1.54 christos return istrsenvisx(mbdst, &dlen, mbsrc, 0, flags, mbextra, NULL);
581 1.15 wennmach }
582 1.44 christos
583 1.44 christos int
584 1.54 christos strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra)
585 1.44 christos {
586 1.54 christos return istrsenvisx(mbdst, NULL, mbsrc, len, flags, mbextra, NULL);
587 1.44 christos }
588 1.44 christos
589 1.44 christos int
590 1.54 christos strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
591 1.46 christos const char *mbextra)
592 1.44 christos {
593 1.54 christos return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, NULL);
594 1.54 christos }
595 1.54 christos
596 1.54 christos int
597 1.54 christos strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
598 1.54 christos const char *mbextra, int *cerr_ptr)
599 1.54 christos {
600 1.54 christos return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr);
601 1.44 christos }
602 1.24 pooka #endif
603 1.15 wennmach
604 1.24 pooka #if !HAVE_VIS
605 1.1 cgd /*
606 1.1 cgd * vis - visually encode characters
607 1.1 cgd */
608 1.46 christos char *
609 1.54 christos vis(char *mbdst, int c, int flags, int nextc)
610 1.15 wennmach {
611 1.46 christos char cc[2];
612 1.46 christos int ret;
613 1.15 wennmach
614 1.46 christos cc[0] = c;
615 1.46 christos cc[1] = nextc;
616 1.15 wennmach
617 1.54 christos ret = istrsenvisx(mbdst, NULL, cc, 1, flags, "", NULL);
618 1.46 christos if (ret < 0)
619 1.44 christos return NULL;
620 1.46 christos return mbdst + ret;
621 1.1 cgd }
622 1.1 cgd
623 1.44 christos char *
624 1.54 christos nvis(char *mbdst, size_t dlen, int c, int flags, int nextc)
625 1.44 christos {
626 1.46 christos char cc[2];
627 1.46 christos int ret;
628 1.46 christos
629 1.46 christos cc[0] = c;
630 1.46 christos cc[1] = nextc;
631 1.44 christos
632 1.54 christos ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, "", NULL);
633 1.46 christos if (ret < 0)
634 1.46 christos return NULL;
635 1.46 christos return mbdst + ret;
636 1.44 christos }
637 1.44 christos
638 1.1 cgd /*
639 1.46 christos * strvis - visually encode characters from src into dst
640 1.27 enami *
641 1.16 wennmach * Dst must be 4 times the size of src to account for possible
642 1.16 wennmach * expansion. The length of dst, not including the trailing NULL,
643 1.27 enami * is returned.
644 1.1 cgd */
645 1.1 cgd
646 1.44 christos int
647 1.54 christos strvis(char *mbdst, const char *mbsrc, int flags)
648 1.44 christos {
649 1.54 christos return istrsenvisx(mbdst, NULL, mbsrc, 0, flags, "", NULL);
650 1.44 christos }
651 1.15 wennmach
652 1.1 cgd int
653 1.54 christos strnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags)
654 1.44 christos {
655 1.54 christos return istrsenvisx(mbdst, &dlen, mbsrc, 0, flags, "", NULL);
656 1.44 christos }
657 1.44 christos
658 1.46 christos /*
659 1.46 christos * strvisx - visually encode characters from src into dst
660 1.46 christos *
661 1.46 christos * Dst must be 4 times the size of src to account for possible
662 1.46 christos * expansion. The length of dst, not including the trailing NULL,
663 1.46 christos * is returned.
664 1.46 christos *
665 1.46 christos * Strvisx encodes exactly len characters from src into dst.
666 1.46 christos * This is useful for encoding a block of data.
667 1.46 christos */
668 1.44 christos
669 1.44 christos int
670 1.54 christos strvisx(char *mbdst, const char *mbsrc, size_t len, int flags)
671 1.54 christos {
672 1.54 christos return istrsenvisx(mbdst, NULL, mbsrc, len, flags, "", NULL);
673 1.54 christos }
674 1.54 christos
675 1.54 christos int
676 1.54 christos strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags)
677 1.44 christos {
678 1.54 christos return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", NULL);
679 1.44 christos }
680 1.44 christos
681 1.44 christos int
682 1.54 christos strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
683 1.54 christos int *cerr_ptr)
684 1.44 christos {
685 1.54 christos return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr);
686 1.44 christos }
687 1.20 tv #endif
688