ui_str.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ UserInterface: string related operations.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 - 2016 Steffen (Daode) Nurpmeso <steffen@sdaoden.eu>.
   6  */
   7 /*
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32 #undef n_FILE
  33 #define n_FILE ui_str
  34
  35 #ifndef HAVE_AMALGAMATION
  36 # include "nail.h"
  37 #endif
  38
  39 #include <ctype.h>
  40
  41 FL bool_t
  42 n_visual_info(struct n_visual_info_ctx *vicp, enum n_visual_info_flags vif){
  43 #ifdef HAVE_C90AMEND1
  44    mbstate_t *mbp;
  45 #endif
  46    size_t il;
  47    char const *ib;
  48    bool_t rv;
  49    NYD2_ENTER;
  50
  51    assert(vicp != NULL);
  52    assert(vicp->vic_inlen == 0 || vicp->vic_indat != NULL);
  53    assert(!(vif & n__VISUAL_INFO_FLAGS) || !(vif & n_VISUAL_INFO_ONE_CHAR));
  54
  55    rv = TRU1;
  56    ib = vicp->vic_indat;
  57    if((il = vicp->vic_inlen) == UIZ_MAX)
  58       il = vicp->vic_inlen = strlen(ib);
  59
  60    if((vif & (n_VISUAL_INFO_WIDTH_QUERY | n_VISUAL_INFO_WOUT_PRINTABLE)) ==
  61          n_VISUAL_INFO_WOUT_PRINTABLE)
  62       vif |= n_VISUAL_INFO_WIDTH_QUERY;
  63
  64    vicp->vic_chars_seen = vicp->vic_vi_width = 0;
  65    if(vif & n_VISUAL_INFO_WOUT_CREATE){
  66       if(vif & n_VISUAL_INFO_WOUT_SALLOC)
  67          vicp->vic_woudat = salloc(sizeof(*vicp->vic_woudat) * (il +1));
  68       vicp->vic_woulen = 0;
  69    }
  70 #ifdef HAVE_C90AMEND1
  71    if((mbp = vicp->vic_mbstate) == NULL)
  72       mbp = &vicp->vic_mbs_def;
  73 #endif
  74
  75    if(il > 0){
  76       do/* while(!(vif & n_VISUAL_INFO_ONE_CHAR) && il > 0) */{
  77 #ifdef HAVE_C90AMEND1
  78          size_t i = mbrtowc(&vicp->vic_waccu, ib, il, mbp);
  79
  80          if(i == (size_t)-2){
  81             rv = FAL0;
  82             break;
  83          }else if(i == (size_t)-1){
  84             if(!(vif & n_VISUAL_INFO_SKIP_ERRORS)){
  85                rv = FAL0;
  86                break;
  87             }
  88             memset(mbp, 0, sizeof *mbp);
  89             vicp->vic_waccu = (options & OPT_UNICODE ? 0xFFFD : '?');
  90             i = 1;
  91          }else if(i == 0){
  92             il = 0;
  93             break;
  94          }
  95
  96          ++vicp->vic_chars_seen;
  97          vicp->vic_bytes_seen += i;
  98          ib += i;
  99          il -= i;
 100
 101          if(vif & n_VISUAL_INFO_WIDTH_QUERY){
 102             int w;
 103             wchar_t wc = vicp->vic_waccu;
 104
 105 # ifdef HAVE_WCWIDTH
 106             w = (wc == '\t' ? 1 : wcwidth(wc));
 107 # else
 108             if(wc == '\t' || iswprint(wc))
 109                w = 1 + (wc >= 0x1100u); /* S-CText isfullwidth() */
 110             else
 111                w = -1;
 112 # endif
 113             if(w > 0)
 114                vicp->vic_vi_width += w;
 115             else if(vif & n_VISUAL_INFO_WOUT_PRINTABLE)
 116                continue;
 117          }
 118 #else /* HAVE_C90AMEND1 */
 119          char c = *ib;
 120
 121          if(c == '\0'){
 122             il = 0;
 123             break;
 124          }
 125
 126          ++vicp->vic_chars_seen;
 127          ++vicp->vic_bytes_seen;
 128          vicp->vic_waccu = c;
 129          if(vif & n_VISUAL_INFO_WIDTH_QUERY)
 130             vicp->vic_vi_width += (c == '\t' || isprint(c)); /* XXX */
 131
 132          ++ib;
 133          --il;
 134 #endif
 135
 136          if(vif & n_VISUAL_INFO_WOUT_CREATE)
 137             vicp->vic_woudat[vicp->vic_woulen++] = vicp->vic_waccu;
 138       }while(!(vif & n_VISUAL_INFO_ONE_CHAR) && il > 0);
 139    }
 140
 141    if(vif & n_VISUAL_INFO_WOUT_CREATE)
 142       vicp->vic_woudat[vicp->vic_woulen] = L'\0';
 143    vicp->vic_oudat = ib;
 144    vicp->vic_oulen = il;
 145    vicp->vic_flags = vif;
 146    NYD2_LEAVE;
 147    return rv;
 148 }
 149
 150 FL size_t
 151 field_detect_clip(size_t maxlen, char const *buf, size_t blen)/*TODO mbrtowc()*/
 152 {
 153    size_t rv;
 154    NYD_ENTER;
 155
 156 #ifdef HAVE_NATCH_CHAR
 157    maxlen = MIN(maxlen, blen);
 158    for (rv = 0; maxlen > 0;) {
 159       int ml = mblen(buf, maxlen);
 160       if (ml <= 0) {
 161          mblen(NULL, 0);
 162          break;
 163       }
 164       buf += ml;
 165       rv += ml;
 166       maxlen -= ml;
 167    }
 168 #else
 169    rv = MIN(blen, maxlen);
 170 #endif
 171    NYD_LEAVE;
 172    return rv;
 173 }
 174
 175 FL size_t
 176 field_put_bidi_clip(char *store, size_t maxlen, char const *buf, size_t blen)
 177 {
 178    NATCH_CHAR( struct bidi_info bi; )
 179    size_t rv NATCH_CHAR( COMMA i );
 180    NYD_ENTER;
 181
 182    rv = 0;
 183    if (maxlen-- == 0)
 184       goto j_leave;
 185
 186 #ifdef HAVE_NATCH_CHAR
 187    bidi_info_create(&bi);
 188    if (bi.bi_start.l == 0 || !bidi_info_needed(buf, blen)) {
 189       bi.bi_end.l = 0;
 190       goto jnobidi;
 191    }
 192
 193    if (maxlen >= (i = bi.bi_pad + bi.bi_end.l + bi.bi_start.l))
 194       maxlen -= i;
 195    else
 196       goto jleave;
 197
 198    if ((i = bi.bi_start.l) > 0) {
 199       memcpy(store, bi.bi_start.s, i);
 200       store += i;
 201       rv += i;
 202    }
 203
 204 jnobidi:
 205    while (maxlen > 0) {
 206       int ml = mblen(buf, blen);
 207       if (ml <= 0) {
 208          mblen(NULL, 0);
 209          break;
 210       }
 211       if (UICMP(z, maxlen, <, ml))
 212          break;
 213       if (ml == 1)
 214          *store = *buf;
 215       else
 216          memcpy(store, buf, ml);
 217       store += ml;
 218       buf += ml;
 219       rv += ml;
 220       maxlen -= ml;
 221    }
 222
 223    if ((i = bi.bi_end.l) > 0) {
 224       memcpy(store, bi.bi_end.s, i);
 225       store += i;
 226       rv += i;
 227    }
 228 jleave:
 229    *store = '\0';
 230
 231 #else
 232    rv = MIN(blen, maxlen);
 233    memcpy(store, buf, rv);
 234    store[rv] = '\0';
 235 #endif
 236 j_leave:
 237    NYD_LEAVE;
 238    return rv;
 239 }
 240
 241 FL char *
 242 colalign(char const *cp, int col, int fill, int *cols_decr_used_or_null)
 243 {
 244    NATCH_CHAR( struct bidi_info bi; )
 245    int col_orig = col, n, sz;
 246    bool_t isbidi, isuni, istab, isrepl;
 247    char *nb, *np;
 248    NYD_ENTER;
 249
 250    /* Bidi only on request and when there is 8-bit data */
 251    isbidi = isuni = FAL0;
 252 #ifdef HAVE_NATCH_CHAR
 253    isuni = ((options & OPT_UNICODE) != 0);
 254    bidi_info_create(&bi);
 255    if (bi.bi_start.l == 0)
 256       goto jnobidi;
 257    if (!(isbidi = bidi_info_needed(cp, strlen(cp))))
 258       goto jnobidi;
 259
 260    if ((size_t)col >= bi.bi_pad)
 261       col -= bi.bi_pad;
 262    else
 263       col = 0;
 264 jnobidi:
 265 #endif
 266
 267    np = nb = salloc(mb_cur_max * strlen(cp) +
 268          ((fill ? col : 0)
 269          NATCH_CHAR( + (isbidi ? bi.bi_start.l + bi.bi_end.l : 0) )
 270          +1));
 271
 272 #ifdef HAVE_NATCH_CHAR
 273    if (isbidi) {
 274       memcpy(np, bi.bi_start.s, bi.bi_start.l);
 275       np += bi.bi_start.l;
 276    }
 277 #endif
 278
 279    while (*cp != '\0') {
 280       istab = FAL0;
 281 #ifdef HAVE_C90AMEND1
 282       if (mb_cur_max > 1) {
 283          wchar_t  wc;
 284
 285          n = 1;
 286          isrepl = TRU1;
 287          if ((sz = mbtowc(&wc, cp, mb_cur_max)) == -1)
 288             sz = 1;
 289          else if (wc == L'\t') {
 290             cp += sz - 1; /* Silly, no such charset known (.. until S-Ctext) */
 291             isrepl = FAL0;
 292             istab = TRU1;
 293          } else if (iswprint(wc)) {
 294 # ifndef HAVE_WCWIDTH
 295             n = 1 + (wc >= 0x1100u); /* TODO use S-CText isfullwidth() */
 296 # else
 297             if ((n = wcwidth(wc)) == -1)
 298                n = 1;
 299             else
 300 # endif
 301                isrepl = FAL0;
 302          }
 303       } else
 304 #endif
 305       {
 306          n = sz = 1;
 307          istab = (*cp == '\t');
 308          isrepl = !(istab || isprint((uc_i)*cp));
 309       }
 310
 311       if (n > col)
 312          break;
 313       col -= n;
 314
 315       if (isrepl) {
 316          if (isuni) {
 317             np[0] = (char)0xEFu;
 318             np[1] = (char)0xBFu;
 319             np[2] = (char)0xBDu;
 320             np += 3;
 321          } else
 322             *np++ = '?';
 323          cp += sz;
 324       } else if (istab || (sz == 1 && spacechar(*cp))) {
 325          *np++ = ' ';
 326          ++cp;
 327       } else
 328          while (sz--)
 329             *np++ = *cp++;
 330    }
 331
 332    if (fill && col != 0) {
 333       if (fill > 0) {
 334          memmove(nb + col, nb, PTR2SIZE(np - nb));
 335          memset(nb, ' ', col);
 336       } else
 337          memset(np, ' ', col);
 338       np += col;
 339       col = 0;
 340    }
 341
 342 #ifdef HAVE_NATCH_CHAR
 343    if (isbidi) {
 344       memcpy(np, bi.bi_end.s, bi.bi_end.l);
 345       np += bi.bi_end.l;
 346    }
 347 #endif
 348
 349    *np = '\0';
 350    if (cols_decr_used_or_null != NULL)
 351       *cols_decr_used_or_null -= col_orig - col;
 352    NYD_LEAVE;
 353    return nb;
 354 }
 355
 356 FL void
 357 makeprint(struct str const *in, struct str *out)
 358 {
 359    char const *inp, *maxp;
 360    char *outp;
 361    DBG( size_t msz; )
 362    NYD_ENTER;
 363
 364    out->s = outp = smalloc(DBG( msz = ) in->l*mb_cur_max + 2u*mb_cur_max +1);
 365    inp = in->s;
 366    maxp = inp + in->l;
 367
 368 #ifdef HAVE_NATCH_CHAR
 369    if (mb_cur_max > 1) {
 370       char mbb[MB_LEN_MAX + 1];
 371       wchar_t wc;
 372       int i, n;
 373       bool_t isuni = ((options & OPT_UNICODE) != 0);
 374
 375       out->l = 0;
 376       while (inp < maxp) {
 377          if (*inp & 0200)
 378             n = mbtowc(&wc, inp, PTR2SIZE(maxp - inp));
 379          else {
 380             wc = *inp;
 381             n = 1;
 382          }
 383          if (n == -1) {
 384             /* FIXME Why mbtowc() resetting here?
 385              * FIXME what about ISO 2022-JP plus -- those
 386              * FIXME will loose shifts, then!
 387              * FIXME THUS - we'd need special "known points"
 388              * FIXME to do so - say, after a newline!!
 389              * FIXME WE NEED TO CHANGE ALL USES +MBLEN! */
 390             mbtowc(&wc, NULL, mb_cur_max);
 391             wc = isuni ? 0xFFFD : '?';
 392             n = 1;
 393          } else if (n == 0)
 394             n = 1;
 395          inp += n;
 396          if (!iswprint(wc) && wc != '\n' && wc != '\r' && wc != '\b' &&
 397                wc != '\t') {
 398             if ((wc & ~(wchar_t)037) == 0)
 399                wc = isuni ? 0x2400 | wc : '?';
 400             else if (wc == 0177)
 401                wc = isuni ? 0x2421 : '?';
 402             else
 403                wc = isuni ? 0x2426 : '?';
 404          }else if(isuni){ /* TODO ctext */
 405             /* We need to actively filter out L-TO-R and R-TO-R marks TODO ctext */
 406             if(wc == 0x200E || wc == 0x200F || (wc >= 0x202A && wc <= 0x202E))
 407                continue;
 408             /* And some zero-width messes */
 409             if(wc == 0x00AD || (wc >= 0x200B && wc <= 0x200D))
 410                continue;
 411             /* Oh about the ISO C wide character interfaces, baby! */
 412             if(wc == 0xFEFF)
 413                continue;
 414          }
 415          if ((n = wctomb(mbb, wc)) <= 0)
 416             continue;
 417          out->l += n;
 418          assert(out->l < msz);
 419          for (i = 0; i < n; ++i)
 420             *outp++ = mbb[i];
 421       }
 422    } else
 423 #endif /* NATCH_CHAR */
 424    {
 425       int c;
 426       while (inp < maxp) {
 427          c = *inp++ & 0377;
 428          if (!isprint(c) && c != '\n' && c != '\r' && c != '\b' && c != '\t')
 429             c = '?';
 430          *outp++ = c;
 431       }
 432       out->l = in->l;
 433    }
 434    out->s[out->l] = '\0';
 435    NYD_LEAVE;
 436 }
 437
 438 FL size_t
 439 delctrl(char *cp, size_t len)
 440 {
 441    size_t x, y;
 442    NYD_ENTER;
 443
 444    for (x = y = 0; x < len; ++x)
 445       if (!cntrlchar(cp[x]))
 446          cp[y++] = cp[x];
 447    cp[y] = '\0';
 448    NYD_LEAVE;
 449    return y;
 450 }
 451
 452 FL char *
 453 prstr(char const *s)
 454 {
 455    struct str in, out;
 456    char *rp;
 457    NYD_ENTER;
 458
 459    in.s = UNCONST(s);
 460    in.l = strlen(s);
 461    makeprint(&in, &out);
 462    rp = savestrbuf(out.s, out.l);
 463    free(out.s);
 464    NYD_LEAVE;
 465    return rp;
 466 }
 467
 468 FL int
 469 prout(char const *s, size_t sz, FILE *fp)
 470 {
 471    struct str in, out;
 472    int n;
 473    NYD_ENTER;
 474
 475    in.s = UNCONST(s);
 476    in.l = sz;
 477    makeprint(&in, &out);
 478    n = fwrite(out.s, 1, out.l, fp);
 479    free(out.s);
 480    NYD_LEAVE;
 481    return n;
 482 }
 483
 484 FL size_t
 485 putuc(int u, int c, FILE *fp)
 486 {
 487    size_t rv;
 488    NYD_ENTER;
 489    UNUSED(u);
 490
 491 #ifdef HAVE_NATCH_CHAR
 492    if ((options & OPT_UNICODE) && (u & ~(wchar_t)0177)) {
 493       char mbb[MB_LEN_MAX];
 494       int i, n;
 495
 496       if ((n = wctomb(mbb, u)) > 0) {
 497          rv = wcwidth(u);
 498          for (i = 0; i < n; ++i)
 499             if (putc(mbb[i] & 0377, fp) == EOF) {
 500                rv = 0;
 501                break;
 502             }
 503       } else if (n == 0)
 504          rv = (putc('\0', fp) != EOF);
 505       else
 506          rv = 0;
 507    } else
 508 #endif
 509       rv = (putc(c, fp) != EOF);
 510    NYD_LEAVE;
 511    return rv;
 512 }
 513
 514 FL bool_t
 515 bidi_info_needed(char const *bdat, size_t blen)
 516 {
 517    bool_t rv = FAL0;
 518    NYD_ENTER;
 519
 520 #ifdef HAVE_NATCH_CHAR
 521    if (options & OPT_UNICODE)
 522       while (blen > 0) {
 523          /* TODO Checking for BIDI character: use S-CText fromutf8
 524           * TODO plus isrighttoleft (or whatever there will be)! */
 525          ui32_t c = n_utf8_to_utf32(&bdat, &blen);
 526          if (c == UI32_MAX)
 527             break;
 528
 529          if (c <= 0x05BE)
 530             continue;
 531
 532          /* (Very very fuzzy, awaiting S-CText for good) */
 533          if ((c >= 0x05BE && c <= 0x08E3) ||
 534                (c >= 0xFB1D && c <= 0xFE00) /* No: variation selectors */ ||
 535                (c >= 0xFE70 && c <= 0xFEFC) ||
 536                (c >= 0x10800 && c <= 0x10C48) ||
 537                (c >= 0x1EE00 && c <= 0x1EEF1)) {
 538             rv = TRU1;
 539             break;
 540          }
 541       }
 542 #endif /* HAVE_NATCH_CHAR */
 543    NYD_LEAVE;
 544    return rv;
 545 }
 546
 547 FL void
 548 bidi_info_create(struct bidi_info *bip)
 549 {
 550    /* Unicode: how to isolate RIGHT-TO-LEFT scripts via *headline-bidi*
 551     * 1.1 (Jun 1993): U+200E (E2 80 8E) LEFT-TO-RIGHT MARK
 552     * 6.3 (Sep 2013): U+2068 (E2 81 A8) FIRST STRONG ISOLATE,
 553     *                 U+2069 (E2 81 A9) POP DIRECTIONAL ISOLATE
 554     * Worse results seen for: U+202D "\xE2\x80\xAD" U+202C "\xE2\x80\xAC" */
 555    NATCH_CHAR( char const *hb; )
 556    NYD_ENTER;
 557
 558    memset(bip, 0, sizeof *bip);
 559    bip->bi_start.s = bip->bi_end.s = UNCONST("");
 560
 561 #ifdef HAVE_NATCH_CHAR
 562    if ((options & OPT_UNICODE) && (hb = ok_vlook(headline_bidi)) != NULL) {
 563       switch (*hb) {
 564       case '3':
 565          bip->bi_pad = 2;
 566          /* FALLTHRU */
 567       case '2':
 568          bip->bi_start.s = bip->bi_end.s = UNCONST("\xE2\x80\x8E");
 569          break;
 570       case '1':
 571          bip->bi_pad = 2;
 572          /* FALLTHRU */
 573       default:
 574          bip->bi_start.s = UNCONST("\xE2\x81\xA8");
 575          bip->bi_end.s = UNCONST("\xE2\x81\xA9");
 576          break;
 577       }
 578       bip->bi_start.l = bip->bi_end.l = 3;
 579    }
 580 #endif
 581    NYD_LEAVE;
 582 }
 583
 584 /* s-it-mode */