lib/libc/stdio/vfscanf.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Chris Torek.
   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. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)vfscanf.c        8.1 (Berkeley) 6/4/93
  37  * $FreeBSD: /repoman/r/ncvs/src/lib/libc/stdio/vfscanf.c,v 1.35 2004/01/31 23:16:09 das Exp $
  38  * $DragonFly: src/lib/libc/stdio/vfscanf.c,v 1.7 2005/04/21 16:36:35 joerg Exp $
  39  */
  40
  41 #include "namespace.h"
  42 #include <sys/types.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <ctype.h>
  46 #include <stdarg.h>
  47 #include <string.h>
  48 #include "un-namespace.h"
  49
  50 #include "collate.h"
  51 #include "libc_private.h"
  52 #include "local.h"
  53
  54 #define FLOATING_POINT
  55
  56 #ifdef FLOATING_POINT
  57 #include <locale.h>
  58 #include "floatio.h"
  59 #endif
  60
  61 #define BUF             513     /* Maximum length of numeric string. */
  62
  63 /*
  64  * Flags used during conversion.
  65  */
  66 #define LONG            0x01    /* l: long or double */
  67 #define LONGDBL         0x02    /* L: long double */
  68 #define SHORT           0x04    /* h: short */
  69 #define SUPPRESS        0x08    /* suppress assignment */
  70 #define POINTER         0x10    /* weird %p pointer (`fake hex') */
  71 #define NOSKIP          0x20    /* do not skip blanks */
  72 #define QUAD            0x400
  73
  74 /*
  75  * The following are used in numeric conversions only:
  76  * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
  77  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
  78  */
  79 #define SIGNOK          0x40    /* +/- is (still) legal */
  80 #define NDIGITS         0x80    /* no digits detected */
  81
  82 #define DPTOK           0x100   /* (float) decimal point is still legal */
  83 #define EXPOK           0x200   /* (float) exponent (e+3, etc) still legal */
  84
  85 #define PFXOK           0x100   /* 0x prefix is (still) legal */
  86 #define NZDIGITS        0x200   /* no zero digits detected */
  87 #define HAVESIGN        0x10000 /* sign detected */
  88
  89 /*
  90  * Conversion types.
  91  */
  92 #define CT_CHAR         0       /* %c conversion */
  93 #define CT_CCL          1       /* %[...] conversion */
  94 #define CT_STRING       2       /* %s conversion */
  95 #define CT_INT          3       /* integer, i.e., strtoq or strtouq */
  96 #define CT_FLOAT        4       /* floating, i.e., strtod */
  97
  98 #define u_char unsigned char
  99 #define u_long unsigned long
 100
 101 static u_char *__sccl(char *, u_char *);
 102
 103 /*
 104  * __vfscanf MT-safe version
 105  */
 106 int
 107 __vfscanf(FILE *fp, char const *fmt0, va_list ap)
 108 {
 109         int ret;
 110
 111         FLOCKFILE(fp);
 112         ret = __svfscanf(fp, fmt0, ap);
 113         FUNLOCKFILE(fp);
 114         return (ret);
 115 }
 116
 117 /*
 118  * __svfscanf - non-MT-safe version of __vfscanf
 119  */
 120 int
 121 __svfscanf(FILE *fp, char const *fmt0, va_list ap)
 122 {
 123         u_char *fmt = (u_char *)fmt0;
 124         int c;                  /* character from format, or conversion */
 125         size_t width;           /* field width, or 0 */
 126         char *p;                /* points into all kinds of strings */
 127         int n;                  /* handy integer */
 128         int flags;              /* flags as defined above */
 129         char *p0;               /* saves original value of p when necessary */
 130         int nassigned;          /* number of fields assigned */
 131         int nconversions;       /* number of conversions */
 132         int nread;              /* number of characters consumed from fp */
 133         int base;               /* base argument to strtoq/strtouq */
 134         u_quad_t(*ccfn)();      /* conversion function (strtoq/strtouq) */
 135         char ccltab[256];       /* character class table for %[...] */
 136         char buf[BUF];          /* buffer for numeric conversions */
 137
 138         /* `basefix' is used to avoid `if' tests in the integer scanner */
 139         static short basefix[17] =
 140                 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
 141 #ifdef FLOATING_POINT
 142         char decimal_point = localeconv()->decimal_point[0];
 143 #endif
 144
 145         nassigned = 0;
 146         nconversions = 0;
 147         nread = 0;
 148         base = 0;               /* XXX just to keep gcc happy */
 149         ccfn = NULL;            /* XXX just to keep gcc happy */
 150         for (;;) {
 151                 c = *fmt++;
 152                 if (c == 0)
 153                         return (nassigned);
 154                 if (isspace(c)) {
 155                         while ((fp->_r > 0 || __srefill(fp) == 0) && isspace(*fp->_p))
 156                                 nread++, fp->_r--, fp->_p++;
 157                         continue;
 158                 }
 159                 if (c != '%')
 160                         goto literal;
 161                 width = 0;
 162                 flags = 0;
 163                 /*
 164                  * switch on the format.  continue if done;
 165                  * break once format type is derived.
 166                  */
 167 again:          c = *fmt++;
 168                 switch (c) {
 169                 case '%':
 170 literal:
 171                         if (fp->_r <= 0 && __srefill(fp))
 172                                 goto input_failure;
 173                         if (*fp->_p != c)
 174                                 goto match_failure;
 175                         fp->_r--, fp->_p++;
 176                         nread++;
 177                         continue;
 178
 179                 case '*':
 180                         flags |= SUPPRESS;
 181                         goto again;
 182                 case 'l':
 183                         flags |= LONG;
 184                         goto again;
 185                 case 'q':
 186                         flags |= QUAD;
 187                         goto again;
 188                 case 'L':
 189                         flags |= LONGDBL;
 190                         goto again;
 191                 case 'h':
 192                         flags |= SHORT;
 193                         goto again;
 194
 195                 case '0': case '1': case '2': case '3': case '4':
 196                 case '5': case '6': case '7': case '8': case '9':
 197                         width = width * 10 + c - '0';
 198                         goto again;
 199
 200                 /*
 201                  * Conversions.
 202                  * Those marked `compat' are for 4.[123]BSD compatibility.
 203                  *
 204                  * (According to ANSI, E and X formats are supposed
 205                  * to the same as e and x.  Sorry about that.)
 206                  */
 207                 case 'D':       /* compat */
 208                         flags |= LONG;
 209                         /* FALLTHROUGH */
 210                 case 'd':
 211                         c = CT_INT;
 212                         ccfn = (u_quad_t (*)())strtoq;
 213                         base = 10;
 214                         break;
 215
 216                 case 'i':
 217                         c = CT_INT;
 218                         ccfn = (u_quad_t (*)())strtoq;
 219                         base = 0;
 220                         break;
 221
 222                 case 'O':       /* compat */
 223                         flags |= LONG;
 224                         /* FALLTHROUGH */
 225                 case 'o':
 226                         c = CT_INT;
 227                         ccfn = strtouq;
 228                         base = 8;
 229                         break;
 230
 231                 case 'u':
 232                         c = CT_INT;
 233                         ccfn = strtouq;
 234                         base = 10;
 235                         break;
 236
 237                 case 'X':       /* compat   XXX */
 238                         flags |= LONG;
 239                         /* FALLTHROUGH */
 240                 case 'x':
 241                         flags |= PFXOK; /* enable 0x prefixing */
 242                         c = CT_INT;
 243                         ccfn = strtouq;
 244                         base = 16;
 245                         break;
 246
 247 #ifdef FLOATING_POINT
 248                 case 'E':       /* compat   XXX */
 249                 case 'F':       /* compat */
 250                         flags |= LONG;
 251                         /* FALLTHROUGH */
 252                 case 'e': case 'f': case 'g':
 253                         c = CT_FLOAT;
 254                         break;
 255 #endif
 256
 257                 case 's':
 258                         c = CT_STRING;
 259                         break;
 260
 261                 case '[':
 262                         fmt = __sccl(ccltab, fmt);
 263                         flags |= NOSKIP;
 264                         c = CT_CCL;
 265                         break;
 266
 267                 case 'c':
 268                         flags |= NOSKIP;
 269                         c = CT_CHAR;
 270                         break;
 271
 272                 case 'p':       /* pointer format is like hex */
 273                         flags |= POINTER | PFXOK;
 274                         c = CT_INT;
 275                         ccfn = strtouq;
 276                         base = 16;
 277                         break;
 278
 279                 case 'n':
 280                         nconversions++;
 281                         if (flags & SUPPRESS)   /* ??? */
 282                                 continue;
 283                         if (flags & SHORT)
 284                                 *va_arg(ap, short *) = nread;
 285                         else if (flags & LONG)
 286                                 *va_arg(ap, long *) = nread;
 287                         else if (flags & QUAD)
 288                                 *va_arg(ap, quad_t *) = nread;
 289                         else
 290                                 *va_arg(ap, int *) = nread;
 291                         continue;
 292
 293                 /*
 294                  * Disgusting backwards compatibility hacks.    XXX
 295                  */
 296                 case '\0':      /* compat */
 297                         return (EOF);
 298
 299                 default:        /* compat */
 300                         if (isupper(c))
 301                                 flags |= LONG;
 302                         c = CT_INT;
 303                         ccfn = (u_quad_t (*)())strtoq;
 304                         base = 10;
 305                         break;
 306                 }
 307
 308                 /*
 309                  * We have a conversion that requires input.
 310                  */
 311                 if (fp->_r <= 0 && __srefill(fp))
 312                         goto input_failure;
 313
 314                 /*
 315                  * Consume leading white space, except for formats
 316                  * that suppress this.
 317                  */
 318                 if ((flags & NOSKIP) == 0) {
 319                         while (isspace(*fp->_p)) {
 320                                 nread++;
 321                                 if (--fp->_r > 0)
 322                                         fp->_p++;
 323                                 else if (__srefill(fp))
 324                                         goto input_failure;
 325                         }
 326                         /*
 327                          * Note that there is at least one character in
 328                          * the buffer, so conversions that do not set NOSKIP
 329                          * ca no longer result in an input failure.
 330                          */
 331                 }
 332
 333                 /*
 334                  * Do the conversion.
 335                  */
 336                 switch (c) {
 337
 338                 case CT_CHAR:
 339                         /* scan arbitrary characters (sets NOSKIP) */
 340                         if (width == 0)
 341                                 width = 1;
 342                         if (flags & SUPPRESS) {
 343                                 size_t sum = 0;
 344                                 for (;;) {
 345                                         if ((n = fp->_r) < width) {
 346                                                 sum += n;
 347                                                 width -= n;
 348                                                 fp->_p += n;
 349                                                 if (__srefill(fp)) {
 350                                                         if (sum == 0)
 351                                                             goto input_failure;
 352                                                         break;
 353                                                 }
 354                                         } else {
 355                                                 sum += width;
 356                                                 fp->_r -= width;
 357                                                 fp->_p += width;
 358                                                 break;
 359                                         }
 360                                 }
 361                                 nread += sum;
 362                         } else {
 363                                 size_t r = fread((void *)va_arg(ap, char *), 1,
 364                                     width, fp);
 365
 366                                 if (r == 0)
 367                                         goto input_failure;
 368                                 nread += r;
 369                                 nassigned++;
 370                         }
 371                         nconversions++;
 372                         break;
 373
 374                 case CT_CCL:
 375                         /* scan a (nonempty) character class (sets NOSKIP) */
 376                         if (width == 0)
 377                                 width = (size_t)~0;     /* `infinity' */
 378                         /* take only those things in the class */
 379                         if (flags & SUPPRESS) {
 380                                 n = 0;
 381                                 while (ccltab[*fp->_p]) {
 382                                         n++, fp->_r--, fp->_p++;
 383                                         if (--width == 0)
 384                                                 break;
 385                                         if (fp->_r <= 0 && __srefill(fp)) {
 386                                                 if (n == 0)
 387                                                         goto input_failure;
 388                                                 break;
 389                                         }
 390                                 }
 391                                 if (n == 0)
 392                                         goto match_failure;
 393                         } else {
 394                                 p0 = p = va_arg(ap, char *);
 395                                 while (ccltab[*fp->_p]) {
 396                                         fp->_r--;
 397                                         *p++ = *fp->_p++;
 398                                         if (--width == 0)
 399                                                 break;
 400                                         if (fp->_r <= 0 && __srefill(fp)) {
 401                                                 if (p == p0)
 402                                                         goto input_failure;
 403                                                 break;
 404                                         }
 405                                 }
 406                                 n = p - p0;
 407                                 if (n == 0)
 408                                         goto match_failure;
 409                                 *p = 0;
 410                                 nassigned++;
 411                         }
 412                         nread += n;
 413                         nconversions++;
 414                         break;
 415
 416                 case CT_STRING:
 417                         /* like CCL, but zero-length string OK, & no NOSKIP */
 418                         if (width == 0)
 419                                 width = (size_t)~0;
 420                         if (flags & SUPPRESS) {
 421                                 n = 0;
 422                                 while (!isspace(*fp->_p)) {
 423                                         n++, fp->_r--, fp->_p++;
 424                                         if (--width == 0)
 425                                                 break;
 426                                         if (fp->_r <= 0 && __srefill(fp))
 427                                                 break;
 428                                 }
 429                                 nread += n;
 430                         } else {
 431                                 p0 = p = va_arg(ap, char *);
 432                                 while (!isspace(*fp->_p)) {
 433                                         fp->_r--;
 434                                         *p++ = *fp->_p++;
 435                                         if (--width == 0)
 436                                                 break;
 437                                         if (fp->_r <= 0 && __srefill(fp))
 438                                                 break;
 439                                 }
 440                                 *p = 0;
 441                                 nread += p - p0;
 442                                 nassigned++;
 443                         }
 444                         nconversions++;
 445                         continue;
 446
 447                 case CT_INT:
 448                         /* scan an integer as if by strtoq/strtouq */
 449 #ifdef hardway
 450                         if (width == 0 || width > sizeof(buf) - 1)
 451                                 width = sizeof(buf) - 1;
 452 #else
 453                         /* size_t is unsigned, hence this optimisation */
 454                         if (--width > sizeof(buf) - 2)
 455                                 width = sizeof(buf) - 2;
 456                         width++;
 457 #endif
 458                         flags |= SIGNOK | NDIGITS | NZDIGITS;
 459                         for (p = buf; width; width--) {
 460                                 c = *fp->_p;
 461                                 /*
 462                                  * Switch on the character; `goto ok'
 463                                  * if we accept it as a part of number.
 464                                  */
 465                                 switch (c) {
 466
 467                                 /*
 468                                  * The digit 0 is always legal, but is
 469                                  * special.  For %i conversions, if no
 470                                  * digits (zero or nonzero) have been
 471                                  * scanned (only signs), we will have
 472                                  * base==0.  In that case, we should set
 473                                  * it to 8 and enable 0x prefixing.
 474                                  * Also, if we have not scanned zero digits
 475                                  * before this, do not turn off prefixing
 476                                  * (someone else will turn it off if we
 477                                  * have scanned any nonzero digits).
 478                                  */
 479                                 case '0':
 480                                         if (base == 0) {
 481                                                 base = 8;
 482                                                 flags |= PFXOK;
 483                                         }
 484                                         if (flags & NZDIGITS)
 485                                             flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
 486                                         else
 487                                             flags &= ~(SIGNOK|PFXOK|NDIGITS);
 488                                         goto ok;
 489
 490                                 /* 1 through 7 always legal */
 491                                 case '1': case '2': case '3':
 492                                 case '4': case '5': case '6': case '7':
 493                                         base = basefix[base];
 494                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 495                                         goto ok;
 496
 497                                 /* digits 8 and 9 ok iff decimal or hex */
 498                                 case '8': case '9':
 499                                         base = basefix[base];
 500                                         if (base <= 8)
 501                                                 break;  /* not legal here */
 502                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 503                                         goto ok;
 504
 505                                 /* letters ok iff hex */
 506                                 case 'A': case 'B': case 'C':
 507                                 case 'D': case 'E': case 'F':
 508                                 case 'a': case 'b': case 'c':
 509                                 case 'd': case 'e': case 'f':
 510                                         /* no need to fix base here */
 511                                         if (base <= 10)
 512                                                 break;  /* not legal here */
 513                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
 514                                         goto ok;
 515
 516                                 /* sign ok only as first character */
 517                                 case '+': case '-':
 518                                         if (flags & SIGNOK) {
 519                                                 flags &= ~SIGNOK;
 520                                                 flags |= HAVESIGN;
 521                                                 goto ok;
 522                                         }
 523                                         break;
 524
 525                                 /*
 526                                  * x ok iff flag still set & 2nd char (or
 527                                  * 3rd char if we have a sign).
 528                                  */
 529                                 case 'x': case 'X':
 530                                         if (flags & PFXOK && p ==
 531                                             buf + 1 + !!(flags & HAVESIGN)) {
 532                                                 base = 16;      /* if %i */
 533                                                 flags &= ~PFXOK;
 534                                                 goto ok;
 535                                         }
 536                                         break;
 537                                 }
 538
 539                                 /*
 540                                  * If we got here, c is not a legal character
 541                                  * for a number.  Stop accumulating digits.
 542                                  */
 543                                 break;
 544                 ok:
 545                                 /*
 546                                  * c is legal: store it and look at the next.
 547                                  */
 548                                 *p++ = c;
 549                                 if (--fp->_r > 0)
 550                                         fp->_p++;
 551                                 else if (__srefill(fp))
 552                                         break;          /* EOF */
 553                         }
 554                         /*
 555                          * If we had only a sign, it is no good; push
 556                          * back the sign.  If the number ends in `x',
 557                          * it was [sign] '0' 'x', so push back the x
 558                          * and treat it as [sign] '0'.
 559                          */
 560                         if (flags & NDIGITS) {
 561                                 if (p > buf)
 562                                         (void)__ungetc(*(u_char *)--p, fp);
 563                                 goto match_failure;
 564                         }
 565                         c = ((u_char *)p)[-1];
 566                         if (c == 'x' || c == 'X') {
 567                                 --p;
 568                                 (void)__ungetc(c, fp);
 569                         }
 570                         if ((flags & SUPPRESS) == 0) {
 571                                 u_quad_t res;
 572
 573                                 *p = 0;
 574                                 res = (*ccfn)(buf, (char **)NULL, base);
 575                                 if (flags & POINTER)
 576                                         *va_arg(ap, void **) =
 577                                                 (void *)(u_long)res;
 578                                 else if (flags & SHORT)
 579                                         *va_arg(ap, short *) = res;
 580                                 else if (flags & LONG)
 581                                         *va_arg(ap, long *) = res;
 582                                 else if (flags & QUAD)
 583                                         *va_arg(ap, quad_t *) = res;
 584                                 else
 585                                         *va_arg(ap, int *) = res;
 586                                 nassigned++;
 587                         }
 588                         nread += p - buf;
 589                         nconversions++;
 590                         break;
 591
 592 #ifdef FLOATING_POINT
 593                 case CT_FLOAT:
 594                         /* scan a floating point number as if by strtod */
 595 #ifdef hardway
 596                         if (width == 0 || width > sizeof(buf) - 1)
 597                                 width = sizeof(buf) - 1;
 598 #else
 599                         /* size_t is unsigned, hence this optimisation */
 600                         if (--width > sizeof(buf) - 2)
 601                                 width = sizeof(buf) - 2;
 602                         width++;
 603 #endif
 604                         flags |= SIGNOK | NDIGITS | DPTOK | EXPOK;
 605                         for (p = buf; width; width--) {
 606                                 c = *fp->_p;
 607                                 /*
 608                                  * This code mimicks the integer conversion
 609                                  * code, but is much simpler.
 610                                  */
 611                                 switch (c) {
 612
 613                                 case '0': case '1': case '2': case '3':
 614                                 case '4': case '5': case '6': case '7':
 615                                 case '8': case '9':
 616                                         flags &= ~(SIGNOK | NDIGITS);
 617                                         goto fok;
 618
 619                                 case '+': case '-':
 620                                         if (flags & SIGNOK) {
 621                                                 flags &= ~SIGNOK;
 622                                                 goto fok;
 623                                         }
 624                                         break;
 625                                 case 'e': case 'E':
 626                                         /* no exponent without some digits */
 627                                         if ((flags&(NDIGITS|EXPOK)) == EXPOK) {
 628                                                 flags =
 629                                                     (flags & ~(EXPOK|DPTOK)) |
 630                                                     SIGNOK | NDIGITS;
 631                                                 goto fok;
 632                                         }
 633                                         break;
 634                                 default:
 635                                         if ((char)c == decimal_point &&
 636                                             (flags & DPTOK)) {
 637                                                 flags &= ~(SIGNOK | DPTOK);
 638                                                 goto fok;
 639                                         }
 640                                         break;
 641                                 }
 642                                 break;
 643                 fok:
 644                                 *p++ = c;
 645                                 if (--fp->_r > 0)
 646                                         fp->_p++;
 647                                 else if (__srefill(fp))
 648                                         break;  /* EOF */
 649                         }
 650                         /*
 651                          * If no digits, might be missing exponent digits
 652                          * (just give back the exponent) or might be missing
 653                          * regular digits, but had sign and/or decimal point.
 654                          */
 655                         if (flags & NDIGITS) {
 656                                 if (flags & EXPOK) {
 657                                         /* no digits at all */
 658                                         while (p > buf)
 659                                                 __ungetc(*(u_char *)--p, fp);
 660                                         goto match_failure;
 661                                 }
 662                                 /* just a bad exponent (e and maybe sign) */
 663                                 c = *(u_char *)--p;
 664                                 if (c != 'e' && c != 'E') {
 665                                         (void)__ungetc(c, fp);/* sign */
 666                                         c = *(u_char *)--p;
 667                                 }
 668                                 (void)__ungetc(c, fp);
 669                         }
 670                         if ((flags & SUPPRESS) == 0) {
 671                                 double res;
 672
 673                                 *p = 0;
 674                                 /* XXX this loses precision for long doubles. */
 675                                 res = strtod(buf, (char **) NULL);
 676                                 if (flags & LONGDBL)
 677                                         *va_arg(ap, long double *) = res;
 678                                 else if (flags & LONG)
 679                                         *va_arg(ap, double *) = res;
 680                                 else
 681                                         *va_arg(ap, float *) = res;
 682                                 nassigned++;
 683                         }
 684                         nread += p - buf;
 685                         nconversions++;
 686                         break;
 687 #endif /* FLOATING_POINT */
 688                 }
 689         }
 690 input_failure:
 691         return (nconversions != 0 ? nassigned : EOF);
 692 match_failure:
 693         return (nassigned);
 694 }
 695
 696 /*
 697  * Fill in the given table from the scanset at the given format
 698  * (just after `[').  Return a pointer to the character past the
 699  * closing `]'.  The table has a 1 wherever characters should be
 700  * considered part of the scanset.
 701  */
 702 static u_char *
 703 __sccl(tab, fmt)
 704         char *tab;
 705         u_char *fmt;
 706 {
 707         int c, n, v, i;
 708
 709         /* first `clear' the whole table */
 710         c = *fmt++;             /* first char hat => negated scanset */
 711         if (c == '^') {
 712                 v = 1;          /* default => accept */
 713                 c = *fmt++;     /* get new first char */
 714         } else
 715                 v = 0;          /* default => reject */
 716
 717         /* XXX: Will not work if sizeof(tab*) > sizeof(char) */
 718         (void) memset(tab, v, 256);
 719
 720         if (c == 0)
 721                 return (fmt - 1);/* format ended before closing ] */
 722
 723         /*
 724          * Now set the entries corresponding to the actual scanset
 725          * to the opposite of the above.
 726          *
 727          * The first character may be ']' (or '-') without being special;
 728          * the last character may be '-'.
 729          */
 730         v = 1 - v;
 731         for (;;) {
 732                 tab[c] = v;             /* take character c */
 733 doswitch:
 734                 n = *fmt++;             /* and examine the next */
 735                 switch (n) {
 736
 737                 case 0:                 /* format ended too soon */
 738                         return (fmt - 1);
 739
 740                 case '-':
 741                         /*
 742                          * A scanset of the form
 743                          *      [01+-]
 744                          * is defined as `the digit 0, the digit 1,
 745                          * the character +, the character -', but
 746                          * the effect of a scanset such as
 747                          *      [a-zA-Z0-9]
 748                          * is implementation defined.  The V7 Unix
 749                          * scanf treats `a-z' as `the letters a through
 750                          * z', but treats `a-a' as `the letter a, the
 751                          * character -, and the letter a'.
 752                          *
 753                          * For compatibility, the `-' is not considerd
 754                          * to define a range if the character following
 755                          * it is either a close bracket (required by ANSI)
 756                          * or is not numerically greater than the character
 757                          * we just stored in the table (c).
 758                          */
 759                         n = *fmt;
 760                         if (n == ']'
 761                             || (__collate_load_error ? n < c :
 762                                 __collate_range_cmp (n, c) < 0
 763                                )
 764                            ) {
 765                                 c = '-';
 766                                 break;  /* resume the for(;;) */
 767                         }
 768                         fmt++;
 769                         /* fill in the range */
 770                         if (__collate_load_error) {
 771                                 do {
 772                                         tab[++c] = v;
 773                                 } while (c < n);
 774                         } else {
 775                                 for (i = 0; i < 256; i ++)
 776                                         if (   __collate_range_cmp (c, i) < 0
 777                                             && __collate_range_cmp (i, n) <= 0
 778                                            )
 779                                                 tab[i] = v;
 780                         }
 781 #if 1   /* XXX another disgusting compatibility hack */
 782                         c = n;
 783                         /*
 784                          * Alas, the V7 Unix scanf also treats formats
 785                          * such as [a-c-e] as `the letters a through e'.
 786                          * This too is permitted by the standard....
 787                          */
 788                         goto doswitch;
 789 #else
 790                         c = *fmt++;
 791                         if (c == 0)
 792                                 return (fmt - 1);
 793                         if (c == ']')
 794                                 return (fmt);
 795 #endif
 796                         break;
 797
 798                 case ']':               /* end of scanset */
 799                         return (fmt);
 800
 801                 default:                /* just another character */
 802                         c = n;
 803                         break;
 804                 }
 805         }
 806         /* NOTREACHED */
 807 }