vis(3): Add VIS_ALL support
[dragonfly.git] / lib / libc / gen / vis.c
CommitLineData
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1/* $NetBSD: vis.c,v 1.74 2017/11/27 16:37:21 christos Exp $ */
2
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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.
0f0f9bbd 15 * 3. Neither the name of the University nor the names of its contributors
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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.
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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.
984263bc 44 *
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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.
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56 */
57
4be4de01 58#include "namespace.h"
984263bc 59#include <sys/types.h>
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60#include <sys/param.h>
61
62#include <assert.h>
63#include <vis.h>
64#include <errno.h>
65#include <stdlib.h>
66#include <wchar.h>
67#include <wctype.h>
68
69#ifdef __weak_alias
70__weak_alias(strvisx,_strvisx)
71#endif
72
73#if !HAVE_VIS || !HAVE_SVIS
984263bc 74#include <ctype.h>
5ff478f3 75#include <limits.h>
984263bc 76#include <stdio.h>
5ff478f3 77#include <string.h>
984263bc 78
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79/*
80 * The reason for going through the trouble to deal with character encodings
81 * in vis(3), is that we use this to safe encode output of commands. This
82 * safe encoding varies depending on the character set. For example if we
83 * display ps output in French, we don't want to display French characters
84 * as M-foo.
85 */
86
87static wchar_t *do_svis(wchar_t *, wint_t, int, wint_t, const wchar_t *);
88
89#undef BELL
90#define BELL L'\a'
9dbd27e2 91
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92#if defined(LC_C_LOCALE)
93#define iscgraph(c) isgraph_l(c, LC_C_LOCALE)
94#else
95/* Keep it simple for now, no locale stuff */
96#define iscgraph(c) isgraph(c)
97#ifdef notyet
98#include <locale.h>
99static int
100iscgraph(int c) {
101 int rv;
102 char *ol;
103
104 ol = setlocale(LC_CTYPE, "C");
105 rv = isgraph(c);
106 if (ol)
107 setlocale(LC_CTYPE, ol);
108 return rv;
109}
110#endif
111#endif
112
113#define ISGRAPH(flags, c) \
114 (((flags) & VIS_NOLOCALE) ? iscgraph(c) : iswgraph(c))
115
116#define iswoctal(c) (((u_char)(c)) >= L'0' && ((u_char)(c)) <= L'7')
117#define iswwhite(c) (c == L' ' || c == L'\t' || c == L'\n')
118#define iswsafe(c) (c == L'\b' || c == BELL || c == L'\r')
119#define xtoa(c) L"0123456789abcdef"[c]
120#define XTOA(c) L"0123456789ABCDEF"[c]
121
122#define MAXEXTRAS 30
123
124static const wchar_t char_shell[] = L"'`\";&<>()|{}]\\$!^~";
125static const wchar_t char_glob[] = L"*?[#";
984263bc 126
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127#if !HAVE_NBTOOL_CONFIG_H
128#ifndef __NetBSD__
984263bc 129/*
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130 * On NetBSD MB_LEN_MAX is currently 32 which does not fit on any integer
131 * integral type and it is probably wrong, since currently the maximum
132 * number of bytes and character needs is 6. Until this is fixed, the
133 * loops below are using sizeof(uint64_t) - 1 instead of MB_LEN_MAX, and
134 * the assertion is commented out.
984263bc 135 */
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136#if defined(__FreeBSD__) || defined(__DragonFly__)
137/*
138 * On FreeBSD and DragonFly, including <sys/systm.h> for CTASSERT only
139 * works in kernel mode.
140 */
141#ifndef CTASSERT
142#define CTASSERT(x) _CTASSERT(x, __LINE__)
143#define _CTASSERT(x, y) __CTASSERT(x, y)
144#define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
145#endif
146#endif /* __FreeBSD__ || __DragonFly__ */
147CTASSERT(MB_LEN_MAX <= sizeof(uint64_t));
148#endif /* !__NetBSD__ */
149#endif
150
151/*
152 * This is do_hvis, for HTTP style (RFC 1808)
153 */
154static wchar_t *
155do_hvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
156{
157 if (iswalnum(c)
158 /* safe */
159 || c == L'$' || c == L'-' || c == L'_' || c == L'.' || c == L'+'
160 /* extra */
161 || c == L'!' || c == L'*' || c == L'\'' || c == L'(' || c == L')'
162 || c == L',')
163 dst = do_svis(dst, c, flags, nextc, extra);
164 else {
165 *dst++ = L'%';
166 *dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
167 *dst++ = xtoa((unsigned int)c & 0xf);
168 }
169
170 return dst;
171}
172
173/*
174 * This is do_mvis, for Quoted-Printable MIME (RFC 2045)
175 * NB: No handling of long lines or CRLF.
176 */
177static wchar_t *
178do_mvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
179{
180 if ((c != L'\n') &&
181 /* Space at the end of the line */
182 ((iswspace(c) && (nextc == L'\r' || nextc == L'\n')) ||
183 /* Out of range */
184 (!iswspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) ||
185 /* Specific char to be escaped */
186 wcschr(L"#$@[\\]^`{|}~", c) != NULL)) {
187 *dst++ = L'=';
188 *dst++ = XTOA(((unsigned int)c >> 4) & 0xf);
189 *dst++ = XTOA((unsigned int)c & 0xf);
190 } else
191 dst = do_svis(dst, c, flags, nextc, extra);
192 return dst;
193}
194
195/*
196 * Output single byte of multibyte character.
197 */
198static wchar_t *
199do_mbyte(wchar_t *dst, wint_t c, int flags, wint_t nextc, int iswextra)
200{
201 if (flags & VIS_CSTYLE) {
202 switch (c) {
203 case L'\n':
204 *dst++ = L'\\'; *dst++ = L'n';
205 return dst;
206 case L'\r':
207 *dst++ = L'\\'; *dst++ = L'r';
208 return dst;
209 case L'\b':
210 *dst++ = L'\\'; *dst++ = L'b';
211 return dst;
212 case BELL:
213 *dst++ = L'\\'; *dst++ = L'a';
214 return dst;
215 case L'\v':
216 *dst++ = L'\\'; *dst++ = L'v';
217 return dst;
218 case L'\t':
219 *dst++ = L'\\'; *dst++ = L't';
220 return dst;
221 case L'\f':
222 *dst++ = L'\\'; *dst++ = L'f';
223 return dst;
224 case L' ':
225 *dst++ = L'\\'; *dst++ = L's';
226 return dst;
227 case L'\0':
228 *dst++ = L'\\'; *dst++ = L'0';
229 if (iswoctal(nextc)) {
230 *dst++ = L'0';
231 *dst++ = L'0';
232 }
233 return dst;
234 /* We cannot encode these characters in VIS_CSTYLE
235 * because they special meaning */
236 case L'n':
237 case L'r':
238 case L'b':
239 case L'a':
240 case L'v':
241 case L't':
242 case L'f':
243 case L's':
9dbd27e2 244 case L'x':
4be4de01 245 case L'0':
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246 case L'E':
247 case L'F':
4be4de01 248 case L'M':
9dbd27e2 249 case L'-':
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250 case L'^':
251 case L'$': /* vis(1) -l */
252 break;
253 default:
254 if (ISGRAPH(flags, c) && !iswoctal(c)) {
255 *dst++ = L'\\';
256 *dst++ = c;
257 return dst;
258 }
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259 }
260 }
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261 if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) {
262 *dst++ = L'\\';
263 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + L'0';
264 *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + L'0';
265 *dst++ = (c & 07) + L'0';
266 } else {
267 if ((flags & VIS_NOSLASH) == 0)
268 *dst++ = L'\\';
984263bc 269
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270 if (c & 0200) {
271 c &= 0177;
272 *dst++ = L'M';
273 }
274
275 if (iswcntrl(c)) {
276 *dst++ = L'^';
277 if (c == 0177)
278 *dst++ = L'?';
279 else
280 *dst++ = c + L'@';
281 } else {
282 *dst++ = L'-';
283 *dst++ = c;
284 }
285 }
286
287 return dst;
288}
289
290/*
291 * This is do_vis, the central code of vis.
292 * dst: Pointer to the destination buffer
293 * c: Character to encode
294 * flags: Flags word
295 * nextc: The character following 'c'
296 * extra: Pointer to the list of extra characters to be
297 * backslash-protected.
298 */
299static wchar_t *
300do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
301{
302 int iswextra, i, shft;
303 uint64_t bmsk, wmsk;
304
305 iswextra = wcschr(extra, c) != NULL;
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306 if (((flags & VIS_ALL) == 0) &&
307 !iswextra &&
308 (ISGRAPH(flags, c) || iswwhite(c) ||
309 ((flags & VIS_SAFE) && iswsafe(c)))) {
984263bc 310 *dst++ = c;
4be4de01 311 return dst;
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312 }
313
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314 /* See comment in istrsenvisx() output loop, below. */
315 wmsk = 0;
316 for (i = sizeof(wmsk) - 1; i >= 0; i--) {
317 shft = i * NBBY;
318 bmsk = (uint64_t)0xffLL << shft;
319 wmsk |= bmsk;
320 if ((c & wmsk) || i == 0)
321 dst = do_mbyte(dst, (wint_t)(
322 (uint64_t)(c & bmsk) >> shft),
323 flags, nextc, iswextra);
324 }
325
326 return dst;
327}
328
329typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *);
330
331/*
332 * Return the appropriate encoding function depending on the flags given.
333 */
334static visfun_t
335getvisfun(int flags)
336{
337 if (flags & VIS_HTTPSTYLE)
338 return do_hvis;
339 if (flags & VIS_MIMESTYLE)
340 return do_mvis;
341 return do_svis;
342}
343
344/*
345 * Expand list of extra characters to not visually encode.
346 */
347static wchar_t *
348makeextralist(int flags, const char *src)
349{
350 wchar_t *dst, *d;
351 size_t len;
352 const wchar_t *s;
353
354 len = strlen(src);
355 if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL)
356 return NULL;
357
358 if ((flags & VIS_NOLOCALE) || mbstowcs(dst, src, len) == (size_t)-1) {
359 size_t i;
360 for (i = 0; i < len; i++)
361 dst[i] = (wchar_t)(u_char)src[i];
362 d = dst + len;
363 } else
364 d = dst + wcslen(dst);
365
366 if (flags & VIS_GLOB)
367 for (s = char_glob; *s; *d++ = *s++)
368 continue;
369
370 if (flags & VIS_SHELL)
371 for (s = char_shell; *s; *d++ = *s++)
372 continue;
373
374 if (flags & VIS_SP) *d++ = L' ';
375 if (flags & VIS_TAB) *d++ = L'\t';
376 if (flags & VIS_NL) *d++ = L'\n';
377 if (flags & VIS_DQ) *d++ = L'"';
378 if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\';
379 *d = L'\0';
380
381 return dst;
382}
383
384/*
385 * istrsenvisx()
9dbd27e2 386 * The main internal function.
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387 * All user-visible functions call this one.
388 */
389static int
390istrsenvisx(char **mbdstp, size_t *dlen, const char *mbsrc, size_t mblength,
391 int flags, const char *mbextra, int *cerr_ptr)
392{
393 wchar_t *dst, *src, *pdst, *psrc, *start, *extra;
394 size_t len, olen;
395 uint64_t bmsk, wmsk;
396 wint_t c;
397 visfun_t f;
398 int clen = 0, cerr, error = -1, i, shft;
399 char *mbdst, *mdst;
400 ssize_t mbslength, maxolen;
401
402 _DIAGASSERT(mbdstp != NULL);
403 _DIAGASSERT(mbsrc != NULL || mblength == 0);
404 _DIAGASSERT(mbextra != NULL);
405
406 mbslength = (ssize_t)mblength;
407 /*
408 * When inputing a single character, must also read in the
409 * next character for nextc, the look-ahead character.
410 */
411 if (mbslength == 1)
412 mbslength++;
413
414 /*
415 * Input (mbsrc) is a char string considered to be multibyte
416 * characters. The input loop will read this string pulling
417 * one character, possibly multiple bytes, from mbsrc and
418 * converting each to wchar_t in src.
419 *
420 * The vis conversion will be done using the wide char
421 * wchar_t string.
422 *
423 * This will then be converted back to a multibyte string to
424 * return to the caller.
425 */
426
427 /* Allocate space for the wide char strings */
428 psrc = pdst = extra = NULL;
429 mdst = NULL;
430 if ((psrc = calloc(mbslength + 1, sizeof(*psrc))) == NULL)
431 return -1;
432 if ((pdst = calloc((16 * mbslength) + 1, sizeof(*pdst))) == NULL)
433 goto out;
434 if (*mbdstp == NULL) {
435 if ((mdst = calloc((16 * mbslength) + 1, sizeof(*mdst))) == NULL)
436 goto out;
437 *mbdstp = mdst;
438 }
439
440 mbdst = *mbdstp;
441 dst = pdst;
442 src = psrc;
443
444 if (flags & VIS_NOLOCALE) {
445 /* Do one byte at a time conversion */
446 cerr = 1;
447 } else {
448 /* Use caller's multibyte conversion error flag. */
449 cerr = cerr_ptr ? *cerr_ptr : 0;
450 }
451
452 /*
453 * Input loop.
454 * Handle up to mblength characters (not bytes). We do not
455 * stop at NULs because we may be processing a block of data
456 * that includes NULs.
457 */
458 while (mbslength > 0) {
459 /* Convert one multibyte character to wchar_t. */
460 if (!cerr)
461 clen = mbtowc(src, mbsrc, MB_LEN_MAX);
462 if (cerr || clen < 0) {
463 /* Conversion error, process as a byte instead. */
464 *src = (wint_t)(u_char)*mbsrc;
465 clen = 1;
466 cerr = 1;
467 }
468 if (clen == 0) {
469 /*
470 * NUL in input gives 0 return value. process
471 * as single NUL byte and keep going.
472 */
473 clen = 1;
984263bc 474 }
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475 /* Advance buffer character pointer. */
476 src++;
477 /* Advance input pointer by number of bytes read. */
478 mbsrc += clen;
479 /* Decrement input byte count. */
480 mbslength -= clen;
984263bc 481 }
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482 len = src - psrc;
483 src = psrc;
484
485 /*
486 * In the single character input case, we will have actually
487 * processed two characters, c and nextc. Reset len back to
488 * just a single character.
489 */
490 if (mblength < len)
491 len = mblength;
492
493 /* Convert extra argument to list of characters for this mode. */
494 extra = makeextralist(flags, mbextra);
495 if (!extra) {
496 if (dlen && *dlen == 0) {
497 errno = ENOSPC;
498 goto out;
499 }
500 *mbdst = '\0'; /* can't create extra, return "" */
501 error = 0;
502 goto out;
984263bc 503 }
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504
505 /* Look up which processing function to call. */
506 f = getvisfun(flags);
507
508 /*
509 * Main processing loop.
510 * Call do_Xvis processing function one character at a time
511 * with next character available for look-ahead.
512 */
513 for (start = dst; len > 0; len--) {
514 c = *src++;
515 dst = (*f)(dst, c, flags, len >= 1 ? *src : L'\0', extra);
516 if (dst == NULL) {
517 errno = ENOSPC;
518 goto out;
519 }
984263bc 520 }
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521
522 /* Terminate the string in the buffer. */
523 *dst = L'\0';
524
525 /*
526 * Output loop.
527 * Convert wchar_t string back to multibyte output string.
528 * If we have hit a multi-byte conversion error on input,
529 * output byte-by-byte here. Else use wctomb().
530 */
531 len = wcslen(start);
532 maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1);
533 olen = 0;
534 for (dst = start; len > 0; len--) {
535 if (!cerr)
536 clen = wctomb(mbdst, *dst);
537 if (cerr || clen < 0) {
538 /*
539 * Conversion error, process as a byte(s) instead.
540 * Examine each byte and higher-order bytes for
541 * data. E.g.,
542 * 0x000000000000a264 -> a2 64
543 * 0x000000001f00a264 -> 1f 00 a2 64
544 */
545 clen = 0;
546 wmsk = 0;
547 for (i = sizeof(wmsk) - 1; i >= 0; i--) {
548 shft = i * NBBY;
549 bmsk = (uint64_t)0xffLL << shft;
550 wmsk |= bmsk;
551 if ((*dst & wmsk) || i == 0)
552 mbdst[clen++] = (char)(
553 (uint64_t)(*dst & bmsk) >>
554 shft);
555 }
556 cerr = 1;
557 }
558 /* If this character would exceed our output limit, stop. */
559 if (olen + clen > (size_t)maxolen)
560 break;
561 /* Advance output pointer by number of bytes written. */
562 mbdst += clen;
563 /* Advance buffer character pointer. */
564 dst++;
565 /* Incrment output character count. */
566 olen += clen;
984263bc 567 }
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568
569 /* Terminate the output string. */
570 *mbdst = '\0';
571
572 if (flags & VIS_NOLOCALE) {
573 /* Pass conversion error flag out. */
574 if (cerr_ptr)
575 *cerr_ptr = cerr;
576 }
577
578 free(extra);
579 free(pdst);
580 free(psrc);
581
582 return (int)olen;
583out:
584 free(extra);
585 free(pdst);
586 free(psrc);
587 free(mdst);
588 return error;
589}
590
591static int
592istrsenvisxl(char **mbdstp, size_t *dlen, const char *mbsrc,
593 int flags, const char *mbextra, int *cerr_ptr)
594{
595 return istrsenvisx(mbdstp, dlen, mbsrc,
596 mbsrc != NULL ? strlen(mbsrc) : 0, flags, mbextra, cerr_ptr);
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597}
598
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599#endif
600
601#if !HAVE_SVIS
984263bc 602/*
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603 * The "svis" variants all take an "extra" arg that is a pointer
604 * to a NUL-terminated list of characters to be encoded, too.
605 * These functions are useful e. g. to encode strings in such a
606 * way so that they are not interpreted by a shell.
607 */
608
609char *
610svis(char *mbdst, int c, int flags, int nextc, const char *mbextra)
611{
612 char cc[2];
613 int ret;
614
615 cc[0] = c;
616 cc[1] = nextc;
617
618 ret = istrsenvisx(&mbdst, NULL, cc, 1, flags, mbextra, NULL);
619 if (ret < 0)
620 return NULL;
621 return mbdst + ret;
622}
623
624char *
625snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra)
626{
627 char cc[2];
628 int ret;
629
630 cc[0] = c;
631 cc[1] = nextc;
632
633 ret = istrsenvisx(&mbdst, &dlen, cc, 1, flags, mbextra, NULL);
634 if (ret < 0)
635 return NULL;
636 return mbdst + ret;
637}
638
639int
640strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra)
641{
642 return istrsenvisxl(&mbdst, NULL, mbsrc, flags, mbextra, NULL);
643}
644
645int
646strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra)
647{
648 return istrsenvisxl(&mbdst, &dlen, mbsrc, flags, mbextra, NULL);
649}
650
651int
652strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra)
653{
654 return istrsenvisx(&mbdst, NULL, mbsrc, len, flags, mbextra, NULL);
655}
656
657int
658strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
659 const char *mbextra)
660{
661 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, mbextra, NULL);
662}
663
664int
665strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
666 const char *mbextra, int *cerr_ptr)
667{
668 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr);
669}
670#endif
671
672#if !HAVE_VIS
673/*
674 * vis - visually encode characters
675 */
676char *
677vis(char *mbdst, int c, int flags, int nextc)
678{
679 char cc[2];
680 int ret;
681
682 cc[0] = c;
683 cc[1] = nextc;
684
685 ret = istrsenvisx(&mbdst, NULL, cc, 1, flags, "", NULL);
686 if (ret < 0)
687 return NULL;
688 return mbdst + ret;
689}
690
691char *
692nvis(char *mbdst, size_t dlen, int c, int flags, int nextc)
693{
694 char cc[2];
695 int ret;
696
697 cc[0] = c;
698 cc[1] = nextc;
699
700 ret = istrsenvisx(&mbdst, &dlen, cc, 1, flags, "", NULL);
701 if (ret < 0)
702 return NULL;
703 return mbdst + ret;
704}
705
706/*
707 * strvis - visually encode characters from src into dst
984263bc
MD
708 *
709 * Dst must be 4 times the size of src to account for possible
4be4de01 710 * expansion. The length of dst, not including the trailing NULL,
984263bc 711 * is returned.
984263bc 712 */
4be4de01 713
984263bc 714int
4be4de01 715strvis(char *mbdst, const char *mbsrc, int flags)
984263bc 716{
4be4de01 717 return istrsenvisxl(&mbdst, NULL, mbsrc, flags, "", NULL);
984263bc
MD
718}
719
5ff478f3
JS
720int
721strnvis(char *dst, const char *src, size_t len, int flag)
722{
4be4de01 723 return istrsenvisxl(&dst, &len, src, flag, "", NULL);
5ff478f3
JS
724}
725
984263bc 726int
4be4de01 727stravis(char **mbdstp, const char *mbsrc, int flags)
984263bc 728{
4be4de01
FT
729 *mbdstp = NULL;
730 return istrsenvisxl(mbdstp, NULL, mbsrc, flags, "", NULL);
731}
984263bc 732
4be4de01
FT
733/*
734 * strvisx - visually encode characters from src into dst
735 *
736 * Dst must be 4 times the size of src to account for possible
737 * expansion. The length of dst, not including the trailing NULL,
738 * is returned.
739 *
740 * Strvisx encodes exactly len characters from src into dst.
741 * This is useful for encoding a block of data.
742 */
743
744int
745strvisx(char *mbdst, const char *mbsrc, size_t len, int flags)
746{
747 return istrsenvisx(&mbdst, NULL, mbsrc, len, flags, "", NULL);
748}
984263bc 749
4be4de01
FT
750int
751strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags)
752{
753 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, "", NULL);
754}
755
756int
757strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
758 int *cerr_ptr)
759{
760 return istrsenvisx(&mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr);
984263bc 761}
4be4de01 762#endif