1 /* $NetBSD: vis.c,v 1.60 2013/02/21 16:21:20 joerg Exp $ */
2
3 /*-
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*-
33 * Copyright (c) 1999, 2005 The NetBSD Foundation, Inc.
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
46 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
47 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
48 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
49 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
50 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
51 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
52 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
53 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
54 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
55 * POSSIBILITY OF SUCH DAMAGE.
56 */
57
58 #include "config.h"
59
60 #if defined(LIBC_SCCS) && !defined(lint)
61 __RCSID("$NetBSD: vis.c,v 1.60 2013/02/21 16:21:20 joerg Exp $");
62 #endif /* LIBC_SCCS and not lint */
63 #ifdef __FBSDID
64 __FBSDID("$FreeBSD$");
65 #endif
66
67 #include <sys/types.h>
68 #include <sys/param.h>
69
70 #include <stdint.h>
71 #include <assert.h>
72 #include <vis.h>
73 #include <errno.h>
74 #include <stdlib.h>
75 #include <wchar.h>
76 #include <wctype.h>
77
78 #ifdef __weak_alias
79 __weak_alias(strvisx,_strvisx)
80 #endif
81
82 #if !HAVE_VIS || !HAVE_SVIS
83 #include <ctype.h>
84 #include <limits.h>
85 #include <stdio.h>
86 #include <string.h>
87
88 /*
89 * The reason for going through the trouble to deal with character encodings
90 * in vis(3), is that we use this to safe encode output of commands. This
91 * safe encoding varies depending on the character set. For example if we
92 * display ps output in French, we don't want to display French characters
93 * as M-foo.
94 */
95
96 static wchar_t *do_svis(wchar_t *, wint_t, int, wint_t, const wchar_t *);
97
98 #undef BELL
99 #define BELL L'\a'
100
101 #define iswoctal(c) (((u_char)(c)) >= L'0' && ((u_char)(c)) <= L'7')
102 #define iswwhite(c) (c == L' ' || c == L'\t' || c == L'\n')
103 #define iswsafe(c) (c == L'\b' || c == BELL || c == L'\r')
104 #define xtoa(c) L"0123456789abcdef"[c]
105 #define XTOA(c) L"0123456789ABCDEF"[c]
106
107 #define MAXEXTRAS 10
108
109 #if !HAVE_NBTOOL_CONFIG_H
110 #ifndef __NetBSD__
111 /*
112 * On NetBSD MB_LEN_MAX is currently 32 which does not fit on any integer
113 * integral type and it is probably wrong, since currently the maximum
114 * number of bytes and character needs is 6. Until this is fixed, the
115 * loops below are using sizeof(uint64_t) - 1 instead of MB_LEN_MAX, and
116 * the assertion is commented out.
117 */
118 #ifdef __FreeBSD__
119 /*
120 * On FreeBSD including <sys/systm.h> for CTASSERT only works in kernel
121 * mode.
122 */
123 #ifndef CTASSERT
124 #define CTASSERT(x) _CTASSERT(x, __LINE__)
125 #define _CTASSERT(x, y) __CTASSERT(x, y)
126 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
127 #endif
128 #endif /* __FreeBSD__ */
129 /*
130 CTASSERT(MB_LEN_MAX <= sizeof(uint64_t));
131 */
132 #endif /* !__NetBSD__ */
133 #endif
134
135 /*
136 * This is do_hvis, for HTTP style (RFC 1808)
137 */
138 static wchar_t *
do_hvis(wchar_t * dst,wint_t c,int flags,wint_t nextc,const wchar_t * extra)139 do_hvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
140 {
141 if (iswalnum(c)
142 /* safe */
143 || c == L'$' || c == L'-' || c == L'_' || c == L'.' || c == L'+'
144 /* extra */
145 || c == L'!' || c == L'*' || c == L'\'' || c == L'(' || c == L')'
146 || c == L',')
147 dst = do_svis(dst, c, flags, nextc, extra);
148 else {
149 *dst++ = L'%';
150 *dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
151 *dst++ = xtoa((unsigned int)c & 0xf);
152 }
153
154 return dst;
155 }
156
157 /*
158 * This is do_mvis, for Quoted-Printable MIME (RFC 2045)
159 * NB: No handling of long lines or CRLF.
160 */
161 static wchar_t *
do_mvis(wchar_t * dst,wint_t c,int flags,wint_t nextc,const wchar_t * extra)162 do_mvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
163 {
164 if ((c != L'\n') &&
165 /* Space at the end of the line */
166 ((iswspace(c) && (nextc == L'\r' || nextc == L'\n')) ||
167 /* Out of range */
168 (!iswspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) ||
169 /* Specific char to be escaped */
170 wcschr(L"#$@[\\]^`{|}~", c) != NULL)) {
171 *dst++ = L'=';
172 *dst++ = XTOA(((unsigned int)c >> 4) & 0xf);
173 *dst++ = XTOA((unsigned int)c & 0xf);
174 } else
175 dst = do_svis(dst, c, flags, nextc, extra);
176 return dst;
177 }
178
179 /*
180 * Output single byte of multibyte character.
181 */
182 static wchar_t *
do_mbyte(wchar_t * dst,wint_t c,int flags,wint_t nextc,int iswextra)183 do_mbyte(wchar_t *dst, wint_t c, int flags, wint_t nextc, int iswextra)
184 {
185 if (flags & VIS_CSTYLE) {
186 switch (c) {
187 case L'\n':
188 *dst++ = L'\\'; *dst++ = L'n';
189 return dst;
190 case L'\r':
191 *dst++ = L'\\'; *dst++ = L'r';
192 return dst;
193 case L'\b':
194 *dst++ = L'\\'; *dst++ = L'b';
195 return dst;
196 case BELL:
197 *dst++ = L'\\'; *dst++ = L'a';
198 return dst;
199 case L'\v':
200 *dst++ = L'\\'; *dst++ = L'v';
201 return dst;
202 case L'\t':
203 *dst++ = L'\\'; *dst++ = L't';
204 return dst;
205 case L'\f':
206 *dst++ = L'\\'; *dst++ = L'f';
207 return dst;
208 case L' ':
209 *dst++ = L'\\'; *dst++ = L's';
210 return dst;
211 case L'\0':
212 *dst++ = L'\\'; *dst++ = L'0';
213 if (iswoctal(nextc)) {
214 *dst++ = L'0';
215 *dst++ = L'0';
216 }
217 return dst;
218 default:
219 if (iswgraph(c)) {
220 *dst++ = L'\\';
221 *dst++ = c;
222 return dst;
223 }
224 }
225 }
226 if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) {
227 *dst++ = L'\\';
228 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + L'0';
229 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + L'0';
230 *dst++ = (c & 07) + L'0';
231 } else {
232 if ((flags & VIS_NOSLASH) == 0)
233 *dst++ = L'\\';
234
235 if (c & 0200) {
236 c &= 0177;
237 *dst++ = L'M';
238 }
239
240 if (iswcntrl(c)) {
241 *dst++ = L'^';
242 if (c == 0177)
243 *dst++ = L'?';
244 else
245 *dst++ = c + L'@';
246 } else {
247 *dst++ = L'-';
248 *dst++ = c;
249 }
250 }
251
252 return dst;
253 }
254
255 /*
256 * This is do_vis, the central code of vis.
257 * dst: Pointer to the destination buffer
258 * c: Character to encode
259 * flags: Flags word
260 * nextc: The character following 'c'
261 * extra: Pointer to the list of extra characters to be
262 * backslash-protected.
263 */
264 static wchar_t *
do_svis(wchar_t * dst,wint_t c,int flags,wint_t nextc,const wchar_t * extra)265 do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
266 {
267 int iswextra, i, shft;
268 uint64_t bmsk, wmsk;
269
270 iswextra = wcschr(extra, c) != NULL;
271 if (!iswextra && (iswgraph(c) || iswwhite(c) ||
272 ((flags & VIS_SAFE) && iswsafe(c)))) {
273 *dst++ = c;
274 return dst;
275 }
276
277 /* See comment in istrsenvisx() output loop, below. */
278 wmsk = 0;
279 for (i = sizeof(wmsk) - 1; i >= 0; i--) {
280 shft = i * NBBY;
281 bmsk = (uint64_t)0xffLL << shft;
282 wmsk |= bmsk;
283 if ((c & wmsk) || i == 0)
284 dst = do_mbyte(dst, (wint_t)(
285 (uint64_t)(c & bmsk) >> shft),
286 flags, nextc, iswextra);
287 }
288
289 return dst;
290 }
291
292 typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *);
293
294 /*
295 * Return the appropriate encoding function depending on the flags given.
296 */
297 static visfun_t
getvisfun(int flags)298 getvisfun(int flags)
299 {
300 if (flags & VIS_HTTPSTYLE)
301 return do_hvis;
302 if (flags & VIS_MIMESTYLE)
303 return do_mvis;
304 return do_svis;
305 }
306
307 /*
308 * Expand list of extra characters to not visually encode.
309 */
310 static wchar_t *
makeextralist(int flags,const char * src)311 makeextralist(int flags, const char *src)
312 {
313 wchar_t *dst, *d;
314 size_t len;
315
316 len = strlen(src);
317 if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL)
318 return NULL;
319
320 if (mbstowcs(dst, src, len) == (size_t)-1) {
321 size_t i;
322 for (i = 0; i < len; i++)
323 dst[i] = (wint_t)(u_char)src[i];
324 d = dst + len;
325 } else
326 d = dst + wcslen(dst);
327
328 if (flags & VIS_GLOB) {
329 *d++ = L'*';
330 *d++ = L'?';
331 *d++ = L'[';
332 *d++ = L'#';
333 }
334
335 if (flags & VIS_SP) *d++ = L' ';
336 if (flags & VIS_TAB) *d++ = L'\t';
337 if (flags & VIS_NL) *d++ = L'\n';
338 if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\';
339 *d = L'\0';
340
341 return dst;
342 }
343
344 /*
345 * istrsenvisx()
346 * The main internal function.
347 * All user-visible functions call this one.
348 */
349 static int
istrsenvisx(char * mbdst,size_t * dlen,const char * mbsrc,size_t mblength,int flags,const char * mbextra,int * cerr_ptr)350 istrsenvisx(char *mbdst, size_t *dlen, const char *mbsrc, size_t mblength,
351 int flags, const char *mbextra, int *cerr_ptr)
352 {
353 wchar_t *dst, *src, *pdst, *psrc, *start, *extra;
354 size_t len, olen;
355 uint64_t bmsk, wmsk;
356 wint_t c;
357 visfun_t f;
358 int clen = 0, cerr = 0, error = -1, i, shft;
359 ssize_t mbslength, maxolen;
360
361 _DIAGASSERT(mbdst != NULL);
362 _DIAGASSERT(mbsrc != NULL);
363 _DIAGASSERT(mbextra != NULL);
364
365 /*
366 * Input (mbsrc) is a char string considered to be multibyte
367 * characters. The input loop will read this string pulling
368 * one character, possibly multiple bytes, from mbsrc and
369 * converting each to wchar_t in src.
370 *
371 * The vis conversion will be done using the wide char
372 * wchar_t string.
373 *
374 * This will then be converted back to a multibyte string to
375 * return to the caller.
376 */
377
378 /* Allocate space for the wide char strings */
379 psrc = pdst = extra = NULL;
380 if (!mblength)
381 mblength = strlen(mbsrc);
382 if ((psrc = calloc(mblength + 1, sizeof(*psrc))) == NULL)
383 return -1;
384 if ((pdst = calloc((4 * mblength) + 1, sizeof(*pdst))) == NULL)
385 goto out;
386 dst = pdst;
387 src = psrc;
388
389 /* Use caller's multibyte conversion error flag. */
390 if (cerr_ptr)
391 cerr = *cerr_ptr;
392
393 /*
394 * Input loop.
395 * Handle up to mblength characters (not bytes). We do not
396 * stop at NULs because we may be processing a block of data
397 * that includes NULs.
398 */
399 mbslength = (ssize_t)mblength;
400 /*
401 * When inputing a single character, must also read in the
402 * next character for nextc, the look-ahead character.
403 */
404 if (mbslength == 1)
405 mbslength++;
406 while (mbslength > 0) {
407 /* Convert one multibyte character to wchar_t. */
408 if (!cerr)
409 clen = mbtowc(src, mbsrc, MB_LEN_MAX);
410 if (cerr || clen < 0) {
411 /* Conversion error, process as a byte instead. */
412 *src = (wint_t)(u_char)*mbsrc;
413 clen = 1;
414 cerr = 1;
415 }
416 if (clen == 0)
417 /*
418 * NUL in input gives 0 return value. process
419 * as single NUL byte and keep going.
420 */
421 clen = 1;
422 /* Advance buffer character pointer. */
423 src++;
424 /* Advance input pointer by number of bytes read. */
425 mbsrc += clen;
426 /* Decrement input byte count. */
427 mbslength -= clen;
428 }
429 len = src - psrc;
430 src = psrc;
431 /*
432 * In the single character input case, we will have actually
433 * processed two characters, c and nextc. Reset len back to
434 * just a single character.
435 */
436 if (mblength < len)
437 len = mblength;
438
439 /* Convert extra argument to list of characters for this mode. */
440 extra = makeextralist(flags, mbextra);
441 if (!extra) {
442 if (dlen && *dlen == 0) {
443 errno = ENOSPC;
444 goto out;
445 }
446 *mbdst = '\0'; /* can't create extra, return "" */
447 error = 0;
448 goto out;
449 }
450
451 /* Look up which processing function to call. */
452 f = getvisfun(flags);
453
454 /*
455 * Main processing loop.
456 * Call do_Xvis processing function one character at a time
457 * with next character available for look-ahead.
458 */
459 for (start = dst; len > 0; len--) {
460 c = *src++;
461 dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra);
462 if (dst == NULL) {
463 errno = ENOSPC;
464 goto out;
465 }
466 }
467
468 /* Terminate the string in the buffer. */
469 *dst = L'\0';
470
471 /*
472 * Output loop.
473 * Convert wchar_t string back to multibyte output string.
474 * If we have hit a multi-byte conversion error on input,
475 * output byte-by-byte here. Else use wctomb().
476 */
477 len = wcslen(start);
478 maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1);
479 olen = 0;
480 for (dst = start; len > 0; len--) {
481 if (!cerr)
482 clen = wctomb(mbdst, *dst);
483 if (cerr || clen < 0) {
484 /*
485 * Conversion error, process as a byte(s) instead.
486 * Examine each byte and higher-order bytes for
487 * data. E.g.,
488 * 0x000000000000a264 -> a2 64
489 * 0x000000001f00a264 -> 1f 00 a2 64
490 */
491 clen = 0;
492 wmsk = 0;
493 for (i = sizeof(wmsk) - 1; i >= 0; i--) {
494 shft = i * NBBY;
495 bmsk = (uint64_t)0xffLL << shft;
496 wmsk |= bmsk;
497 if ((*dst & wmsk) || i == 0)
498 mbdst[clen++] = (char)(
499 (uint64_t)(*dst & bmsk) >>
500 shft);
501 }
502 cerr = 1;
503 }
504 /* If this character would exceed our output limit, stop. */
505 if (olen + clen > (size_t)maxolen)
506 break;
507 /* Advance output pointer by number of bytes written. */
508 mbdst += clen;
509 /* Advance buffer character pointer. */
510 dst++;
511 /* Incrment output character count. */
512 olen += clen;
513 }
514
515 /* Terminate the output string. */
516 *mbdst = '\0';
517
518 /* Pass conversion error flag out. */
519 if (cerr_ptr)
520 *cerr_ptr = cerr;
521
522 free(extra);
523 free(pdst);
524 free(psrc);
525
526 return (int)olen;
527 out:
528 free(extra);
529 free(pdst);
530 free(psrc);
531 return error;
532 }
533 #endif
534
535 #if !HAVE_SVIS
536 /*
537 * The "svis" variants all take an "extra" arg that is a pointer
538 * to a NUL-terminated list of characters to be encoded, too.
539 * These functions are useful e. g. to encode strings in such a
540 * way so that they are not interpreted by a shell.
541 */
542
543 char *
svis(char * mbdst,int c,int flags,int nextc,const char * mbextra)544 svis(char *mbdst, int c, int flags, int nextc, const char *mbextra)
545 {
546 char cc[2];
547 int ret;
548
549 cc[0] = c;
550 cc[1] = nextc;
551
552 ret = istrsenvisx(mbdst, NULL, cc, 1, flags, mbextra, NULL);
553 if (ret < 0)
554 return NULL;
555 return mbdst + ret;
556 }
557
558 char *
snvis(char * mbdst,size_t dlen,int c,int flags,int nextc,const char * mbextra)559 snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra)
560 {
561 char cc[2];
562 int ret;
563
564 cc[0] = c;
565 cc[1] = nextc;
566
567 ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, mbextra, NULL);
568 if (ret < 0)
569 return NULL;
570 return mbdst + ret;
571 }
572
573 int
strsvis(char * mbdst,const char * mbsrc,int flags,const char * mbextra)574 strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra)
575 {
576 return istrsenvisx(mbdst, NULL, mbsrc, 0, flags, mbextra, NULL);
577 }
578
579 int
strsnvis(char * mbdst,size_t dlen,const char * mbsrc,int flags,const char * mbextra)580 strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra)
581 {
582 return istrsenvisx(mbdst, &dlen, mbsrc, 0, flags, mbextra, NULL);
583 }
584
585 int
strsvisx(char * mbdst,const char * mbsrc,size_t len,int flags,const char * mbextra)586 strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra)
587 {
588 return istrsenvisx(mbdst, NULL, mbsrc, len, flags, mbextra, NULL);
589 }
590
591 int
strsnvisx(char * mbdst,size_t dlen,const char * mbsrc,size_t len,int flags,const char * mbextra)592 strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
593 const char *mbextra)
594 {
595 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, NULL);
596 }
597
598 int
strsenvisx(char * mbdst,size_t dlen,const char * mbsrc,size_t len,int flags,const char * mbextra,int * cerr_ptr)599 strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
600 const char *mbextra, int *cerr_ptr)
601 {
602 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr);
603 }
604 #endif
605
606 #if !HAVE_VIS
607 /*
608 * vis - visually encode characters
609 */
610 char *
vis(char * mbdst,int c,int flags,int nextc)611 vis(char *mbdst, int c, int flags, int nextc)
612 {
613 char cc[2];
614 int ret;
615
616 cc[0] = c;
617 cc[1] = nextc;
618
619 ret = istrsenvisx(mbdst, NULL, cc, 1, flags, "", NULL);
620 if (ret < 0)
621 return NULL;
622 return mbdst + ret;
623 }
624
625 char *
nvis(char * mbdst,size_t dlen,int c,int flags,int nextc)626 nvis(char *mbdst, size_t dlen, int c, int flags, int nextc)
627 {
628 char cc[2];
629 int ret;
630
631 cc[0] = c;
632 cc[1] = nextc;
633
634 ret = istrsenvisx(mbdst, &dlen, cc, 1, flags, "", NULL);
635 if (ret < 0)
636 return NULL;
637 return mbdst + ret;
638 }
639
640 /*
641 * strvis - visually encode characters from src into dst
642 *
643 * Dst must be 4 times the size of src to account for possible
644 * expansion. The length of dst, not including the trailing NULL,
645 * is returned.
646 */
647
648 int
strvis(char * mbdst,const char * mbsrc,int flags)649 strvis(char *mbdst, const char *mbsrc, int flags)
650 {
651 return istrsenvisx(mbdst, NULL, mbsrc, 0, flags, "", NULL);
652 }
653
654 int
strnvis(char * mbdst,size_t dlen,const char * mbsrc,int flags)655 strnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags)
656 {
657 return istrsenvisx(mbdst, &dlen, mbsrc, 0, flags, "", NULL);
658 }
659
660 /*
661 * strvisx - visually encode characters from src into dst
662 *
663 * Dst must be 4 times the size of src to account for possible
664 * expansion. The length of dst, not including the trailing NULL,
665 * is returned.
666 *
667 * Strvisx encodes exactly len characters from src into dst.
668 * This is useful for encoding a block of data.
669 */
670
671 int
strvisx(char * mbdst,const char * mbsrc,size_t len,int flags)672 strvisx(char *mbdst, const char *mbsrc, size_t len, int flags)
673 {
674 return istrsenvisx(mbdst, NULL, mbsrc, len, flags, "", NULL);
675 }
676
677 int
strnvisx(char * mbdst,size_t dlen,const char * mbsrc,size_t len,int flags)678 strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags)
679 {
680 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", NULL);
681 }
682
683 int
strenvisx(char * mbdst,size_t dlen,const char * mbsrc,size_t len,int flags,int * cerr_ptr)684 strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
685 int *cerr_ptr)
686 {
687 return istrsenvisx(mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr);
688 }
689 #endif
690