The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_scanf.c

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    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  * 4. 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  * From: Id: vfscanf.c,v 1.13 1998/09/25 12:20:27 obrien Exp 
   33  * From: static char sccsid[] = "@(#)strtol.c   8.1 (Berkeley) 6/4/93";
   34  * From: static char sccsid[] = "@(#)strtoul.c  8.1 (Berkeley) 6/4/93";
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: stable/10/sys/kern/subr_scanf.c 302234 2016-06-27 21:50:30Z bdrewery $");
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/ctype.h>
   43 #include <sys/limits.h>
   44 
   45 /*
   46  * Note that stdarg.h and the ANSI style va_start macro is used for both
   47  * ANSI and traditional C compilers.
   48  */
   49 #include <machine/stdarg.h>
   50 
   51 #define BUF             32      /* Maximum length of numeric string. */
   52 
   53 /*
   54  * Flags used during conversion.
   55  */
   56 #define LONG            0x01    /* l: long or double */
   57 #define SHORT           0x04    /* h: short */
   58 #define SUPPRESS        0x08    /* suppress assignment */
   59 #define POINTER         0x10    /* weird %p pointer (`fake hex') */
   60 #define NOSKIP          0x20    /* do not skip blanks */
   61 #define QUAD            0x400
   62 #define SHORTSHORT      0x4000  /** hh: char */
   63 
   64 /*
   65  * The following are used in numeric conversions only:
   66  * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
   67  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
   68  */
   69 #define SIGNOK          0x40    /* +/- is (still) legal */
   70 #define NDIGITS         0x80    /* no digits detected */
   71 
   72 #define DPTOK           0x100   /* (float) decimal point is still legal */
   73 #define EXPOK           0x200   /* (float) exponent (e+3, etc) still legal */
   74 
   75 #define PFXOK           0x100   /* 0x prefix is (still) legal */
   76 #define NZDIGITS        0x200   /* no zero digits detected */
   77 
   78 /*
   79  * Conversion types.
   80  */
   81 #define CT_CHAR         0       /* %c conversion */
   82 #define CT_CCL          1       /* %[...] conversion */
   83 #define CT_STRING       2       /* %s conversion */
   84 #define CT_INT          3       /* integer, i.e., strtoq or strtouq */
   85 typedef u_quad_t (*ccfntype)(const char *, char **, int);
   86 
   87 static const u_char *__sccl(char *, const u_char *);
   88 
   89 int
   90 sscanf(const char *ibuf, const char *fmt, ...)
   91 {
   92         va_list ap;
   93         int ret;
   94         
   95         va_start(ap, fmt);
   96         ret = vsscanf(ibuf, fmt, ap);
   97         va_end(ap);
   98         return(ret);
   99 }
  100 
  101 int
  102 vsscanf(const char *inp, char const *fmt0, va_list ap)
  103 {
  104         int inr;
  105         const u_char *fmt = (const u_char *)fmt0;
  106         int c;                  /* character from format, or conversion */
  107         size_t width;           /* field width, or 0 */
  108         char *p;                /* points into all kinds of strings */
  109         int n;                  /* handy integer */
  110         int flags;              /* flags as defined above */
  111         char *p0;               /* saves original value of p when necessary */
  112         int nassigned;          /* number of fields assigned */
  113         int nconversions;       /* number of conversions */
  114         int nread;              /* number of characters consumed from fp */
  115         int base;               /* base argument to strtoq/strtouq */
  116         ccfntype ccfn;          /* conversion function (strtoq/strtouq) */
  117         char ccltab[256];       /* character class table for %[...] */
  118         char buf[BUF];          /* buffer for numeric conversions */
  119 
  120         /* `basefix' is used to avoid `if' tests in the integer scanner */
  121         static short basefix[17] =
  122                 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
  123 
  124         inr = strlen(inp);
  125         
  126         nassigned = 0;
  127         nconversions = 0;
  128         nread = 0;
  129         base = 0;               /* XXX just to keep gcc happy */
  130         ccfn = NULL;            /* XXX just to keep gcc happy */
  131         for (;;) {
  132                 c = *fmt++;
  133                 if (c == 0)
  134                         return (nassigned);
  135                 if (isspace(c)) {
  136                         while (inr > 0 && isspace(*inp))
  137                                 nread++, inr--, inp++;
  138                         continue;
  139                 }
  140                 if (c != '%')
  141                         goto literal;
  142                 width = 0;
  143                 flags = 0;
  144                 /*
  145                  * switch on the format.  continue if done;
  146                  * break once format type is derived.
  147                  */
  148 again:          c = *fmt++;
  149                 switch (c) {
  150                 case '%':
  151 literal:
  152                         if (inr <= 0)
  153                                 goto input_failure;
  154                         if (*inp != c)
  155                                 goto match_failure;
  156                         inr--, inp++;
  157                         nread++;
  158                         continue;
  159 
  160                 case '*':
  161                         flags |= SUPPRESS;
  162                         goto again;
  163                 case 'l':
  164                         if (flags & LONG){
  165                                 flags &= ~LONG;
  166                                 flags |= QUAD;
  167                         } else {
  168                                 flags |= LONG;
  169                         }
  170                         goto again;
  171                 case 'q':
  172                         flags |= QUAD;
  173                         goto again;
  174                 case 'h':
  175                         if (flags & SHORT){
  176                                 flags &= ~SHORT;
  177                                 flags |= SHORTSHORT;
  178                         } else {
  179                                 flags |= SHORT;
  180                         }
  181                         goto again;
  182 
  183                 case '': case '1': case '2': case '3': case '4':
  184                 case '5': case '6': case '7': case '8': case '9':
  185                         width = width * 10 + c - '';
  186                         goto again;
  187 
  188                 /*
  189                  * Conversions.
  190                  *
  191                  */
  192                 case 'd':
  193                         c = CT_INT;
  194                         ccfn = (ccfntype)strtoq;
  195                         base = 10;
  196                         break;
  197 
  198                 case 'i':
  199                         c = CT_INT;
  200                         ccfn = (ccfntype)strtoq;
  201                         base = 0;
  202                         break;
  203 
  204                 case 'o':
  205                         c = CT_INT;
  206                         ccfn = strtouq;
  207                         base = 8;
  208                         break;
  209 
  210                 case 'u':
  211                         c = CT_INT;
  212                         ccfn = strtouq;
  213                         base = 10;
  214                         break;
  215 
  216                 case 'x':
  217                         flags |= PFXOK; /* enable 0x prefixing */
  218                         c = CT_INT;
  219                         ccfn = strtouq;
  220                         base = 16;
  221                         break;
  222 
  223                 case 's':
  224                         c = CT_STRING;
  225                         break;
  226 
  227                 case '[':
  228                         fmt = __sccl(ccltab, fmt);
  229                         flags |= NOSKIP;
  230                         c = CT_CCL;
  231                         break;
  232 
  233                 case 'c':
  234                         flags |= NOSKIP;
  235                         c = CT_CHAR;
  236                         break;
  237 
  238                 case 'p':       /* pointer format is like hex */
  239                         flags |= POINTER | PFXOK;
  240                         c = CT_INT;
  241                         ccfn = strtouq;
  242                         base = 16;
  243                         break;
  244 
  245                 case 'n':
  246                         nconversions++;
  247                         if (flags & SUPPRESS)   /* ??? */
  248                                 continue;
  249                         if (flags & SHORTSHORT)
  250                                 *va_arg(ap, char *) = nread;
  251                         else if (flags & SHORT)
  252                                 *va_arg(ap, short *) = nread;
  253                         else if (flags & LONG)
  254                                 *va_arg(ap, long *) = nread;
  255                         else if (flags & QUAD)
  256                                 *va_arg(ap, quad_t *) = nread;
  257                         else
  258                                 *va_arg(ap, int *) = nread;
  259                         continue;
  260                 }
  261 
  262                 /*
  263                  * We have a conversion that requires input.
  264                  */
  265                 if (inr <= 0)
  266                         goto input_failure;
  267 
  268                 /*
  269                  * Consume leading white space, except for formats
  270                  * that suppress this.
  271                  */
  272                 if ((flags & NOSKIP) == 0) {
  273                         while (isspace(*inp)) {
  274                                 nread++;
  275                                 if (--inr > 0)
  276                                         inp++;
  277                                 else 
  278                                         goto input_failure;
  279                         }
  280                         /*
  281                          * Note that there is at least one character in
  282                          * the buffer, so conversions that do not set NOSKIP
  283                          * can no longer result in an input failure.
  284                          */
  285                 }
  286 
  287                 /*
  288                  * Do the conversion.
  289                  */
  290                 switch (c) {
  291 
  292                 case CT_CHAR:
  293                         /* scan arbitrary characters (sets NOSKIP) */
  294                         if (width == 0)
  295                                 width = 1;
  296                         if (flags & SUPPRESS) {
  297                                 size_t sum = 0;
  298                                 for (;;) {
  299                                         if ((n = inr) < width) {
  300                                                 sum += n;
  301                                                 width -= n;
  302                                                 inp += n;
  303                                                 if (sum == 0)
  304                                                         goto input_failure;
  305                                                 break;
  306                                         } else {
  307                                                 sum += width;
  308                                                 inr -= width;
  309                                                 inp += width;
  310                                                 break;
  311                                         }
  312                                 }
  313                                 nread += sum;
  314                         } else {
  315                                 bcopy(inp, va_arg(ap, char *), width);
  316                                 inr -= width;
  317                                 inp += width;
  318                                 nread += width;
  319                                 nassigned++;
  320                         }
  321                         nconversions++;
  322                         break;
  323 
  324                 case CT_CCL:
  325                         /* scan a (nonempty) character class (sets NOSKIP) */
  326                         if (width == 0)
  327                                 width = (size_t)~0;     /* `infinity' */
  328                         /* take only those things in the class */
  329                         if (flags & SUPPRESS) {
  330                                 n = 0;
  331                                 while (ccltab[(unsigned char)*inp]) {
  332                                         n++, inr--, inp++;
  333                                         if (--width == 0)
  334                                                 break;
  335                                         if (inr <= 0) {
  336                                                 if (n == 0)
  337                                                         goto input_failure;
  338                                                 break;
  339                                         }
  340                                 }
  341                                 if (n == 0)
  342                                         goto match_failure;
  343                         } else {
  344                                 p0 = p = va_arg(ap, char *);
  345                                 while (ccltab[(unsigned char)*inp]) {
  346                                         inr--;
  347                                         *p++ = *inp++;
  348                                         if (--width == 0)
  349                                                 break;
  350                                         if (inr <= 0) {
  351                                                 if (p == p0)
  352                                                         goto input_failure;
  353                                                 break;
  354                                         }
  355                                 }
  356                                 n = p - p0;
  357                                 if (n == 0)
  358                                         goto match_failure;
  359                                 *p = 0;
  360                                 nassigned++;
  361                         }
  362                         nread += n;
  363                         nconversions++;
  364                         break;
  365 
  366                 case CT_STRING:
  367                         /* like CCL, but zero-length string OK, & no NOSKIP */
  368                         if (width == 0)
  369                                 width = (size_t)~0;
  370                         if (flags & SUPPRESS) {
  371                                 n = 0;
  372                                 while (!isspace(*inp)) {
  373                                         n++, inr--, inp++;
  374                                         if (--width == 0)
  375                                                 break;
  376                                         if (inr <= 0)
  377                                                 break;
  378                                 }
  379                                 nread += n;
  380                         } else {
  381                                 p0 = p = va_arg(ap, char *);
  382                                 while (!isspace(*inp)) {
  383                                         inr--;
  384                                         *p++ = *inp++;
  385                                         if (--width == 0)
  386                                                 break;
  387                                         if (inr <= 0)
  388                                                 break;
  389                                 }
  390                                 *p = 0;
  391                                 nread += p - p0;
  392                                 nassigned++;
  393                         }
  394                         nconversions++;
  395                         continue;
  396 
  397                 case CT_INT:
  398                         /* scan an integer as if by strtoq/strtouq */
  399 #ifdef hardway
  400                         if (width == 0 || width > sizeof(buf) - 1)
  401                                 width = sizeof(buf) - 1;
  402 #else
  403                         /* size_t is unsigned, hence this optimisation */
  404                         if (--width > sizeof(buf) - 2)
  405                                 width = sizeof(buf) - 2;
  406                         width++;
  407 #endif
  408                         flags |= SIGNOK | NDIGITS | NZDIGITS;
  409                         for (p = buf; width; width--) {
  410                                 c = *inp;
  411                                 /*
  412                                  * Switch on the character; `goto ok'
  413                                  * if we accept it as a part of number.
  414                                  */
  415                                 switch (c) {
  416 
  417                                 /*
  418                                  * The digit 0 is always legal, but is
  419                                  * special.  For %i conversions, if no
  420                                  * digits (zero or nonzero) have been
  421                                  * scanned (only signs), we will have
  422                                  * base==0.  In that case, we should set
  423                                  * it to 8 and enable 0x prefixing.
  424                                  * Also, if we have not scanned zero digits
  425                                  * before this, do not turn off prefixing
  426                                  * (someone else will turn it off if we
  427                                  * have scanned any nonzero digits).
  428                                  */
  429                                 case '':
  430                                         if (base == 0) {
  431                                                 base = 8;
  432                                                 flags |= PFXOK;
  433                                         }
  434                                         if (flags & NZDIGITS)
  435                                             flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
  436                                         else
  437                                             flags &= ~(SIGNOK|PFXOK|NDIGITS);
  438                                         goto ok;
  439 
  440                                 /* 1 through 7 always legal */
  441                                 case '1': case '2': case '3':
  442                                 case '4': case '5': case '6': case '7':
  443                                         base = basefix[base];
  444                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
  445                                         goto ok;
  446 
  447                                 /* digits 8 and 9 ok iff decimal or hex */
  448                                 case '8': case '9':
  449                                         base = basefix[base];
  450                                         if (base <= 8)
  451                                                 break;  /* not legal here */
  452                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
  453                                         goto ok;
  454 
  455                                 /* letters ok iff hex */
  456                                 case 'A': case 'B': case 'C':
  457                                 case 'D': case 'E': case 'F':
  458                                 case 'a': case 'b': case 'c':
  459                                 case 'd': case 'e': case 'f':
  460                                         /* no need to fix base here */
  461                                         if (base <= 10)
  462                                                 break;  /* not legal here */
  463                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
  464                                         goto ok;
  465 
  466                                 /* sign ok only as first character */
  467                                 case '+': case '-':
  468                                         if (flags & SIGNOK) {
  469                                                 flags &= ~SIGNOK;
  470                                                 goto ok;
  471                                         }
  472                                         break;
  473 
  474                                 /* x ok iff flag still set & 2nd char */
  475                                 case 'x': case 'X':
  476                                         if (flags & PFXOK && p == buf + 1) {
  477                                                 base = 16;      /* if %i */
  478                                                 flags &= ~PFXOK;
  479                                                 goto ok;
  480                                         }
  481                                         break;
  482                                 }
  483 
  484                                 /*
  485                                  * If we got here, c is not a legal character
  486                                  * for a number.  Stop accumulating digits.
  487                                  */
  488                                 break;
  489                 ok:
  490                                 /*
  491                                  * c is legal: store it and look at the next.
  492                                  */
  493                                 *p++ = c;
  494                                 if (--inr > 0)
  495                                         inp++;
  496                                 else 
  497                                         break;          /* end of input */
  498                         }
  499                         /*
  500                          * If we had only a sign, it is no good; push
  501                          * back the sign.  If the number ends in `x',
  502                          * it was [sign] '' 'x', so push back the x
  503                          * and treat it as [sign] ''.
  504                          */
  505                         if (flags & NDIGITS) {
  506                                 if (p > buf) {
  507                                         inp--;
  508                                         inr++;
  509                                 }
  510                                 goto match_failure;
  511                         }
  512                         c = ((u_char *)p)[-1];
  513                         if (c == 'x' || c == 'X') {
  514                                 --p;
  515                                 inp--;
  516                                 inr++;
  517                         }
  518                         if ((flags & SUPPRESS) == 0) {
  519                                 u_quad_t res;
  520 
  521                                 *p = 0;
  522                                 res = (*ccfn)(buf, (char **)NULL, base);
  523                                 if (flags & POINTER)
  524                                         *va_arg(ap, void **) =
  525                                                 (void *)(uintptr_t)res;
  526                                 else if (flags & SHORTSHORT)
  527                                         *va_arg(ap, char *) = res;
  528                                 else if (flags & SHORT)
  529                                         *va_arg(ap, short *) = res;
  530                                 else if (flags & LONG)
  531                                         *va_arg(ap, long *) = res;
  532                                 else if (flags & QUAD)
  533                                         *va_arg(ap, quad_t *) = res;
  534                                 else
  535                                         *va_arg(ap, int *) = res;
  536                                 nassigned++;
  537                         }
  538                         nread += p - buf;
  539                         nconversions++;
  540                         break;
  541 
  542                 }
  543         }
  544 input_failure:
  545         return (nconversions != 0 ? nassigned : -1);
  546 match_failure:
  547         return (nassigned);
  548 }
  549 
  550 /*
  551  * Fill in the given table from the scanset at the given format
  552  * (just after `[').  Return a pointer to the character past the
  553  * closing `]'.  The table has a 1 wherever characters should be
  554  * considered part of the scanset.
  555  */
  556 static const u_char *
  557 __sccl(char *tab, const u_char *fmt)
  558 {
  559         int c, n, v;
  560 
  561         /* first `clear' the whole table */
  562         c = *fmt++;             /* first char hat => negated scanset */
  563         if (c == '^') {
  564                 v = 1;          /* default => accept */
  565                 c = *fmt++;     /* get new first char */
  566         } else
  567                 v = 0;          /* default => reject */
  568 
  569         /* XXX: Will not work if sizeof(tab*) > sizeof(char) */
  570         for (n = 0; n < 256; n++)
  571                      tab[n] = v;        /* memset(tab, v, 256) */
  572 
  573         if (c == 0)
  574                 return (fmt - 1);/* format ended before closing ] */
  575 
  576         /*
  577          * Now set the entries corresponding to the actual scanset
  578          * to the opposite of the above.
  579          *
  580          * The first character may be ']' (or '-') without being special;
  581          * the last character may be '-'.
  582          */
  583         v = 1 - v;
  584         for (;;) {
  585                 tab[c] = v;             /* take character c */
  586 doswitch:
  587                 n = *fmt++;             /* and examine the next */
  588                 switch (n) {
  589 
  590                 case 0:                 /* format ended too soon */
  591                         return (fmt - 1);
  592 
  593                 case '-':
  594                         /*
  595                          * A scanset of the form
  596                          *      [01+-]
  597                          * is defined as `the digit 0, the digit 1,
  598                          * the character +, the character -', but
  599                          * the effect of a scanset such as
  600                          *      [a-zA-Z0-9]
  601                          * is implementation defined.  The V7 Unix
  602                          * scanf treats `a-z' as `the letters a through
  603                          * z', but treats `a-a' as `the letter a, the
  604                          * character -, and the letter a'.
  605                          *
  606                          * For compatibility, the `-' is not considered
  607                          * to define a range if the character following
  608                          * it is either a close bracket (required by ANSI)
  609                          * or is not numerically greater than the character
  610                          * we just stored in the table (c).
  611                          */
  612                         n = *fmt;
  613                         if (n == ']' || n < c) {
  614                                 c = '-';
  615                                 break;  /* resume the for(;;) */
  616                         }
  617                         fmt++;
  618                         /* fill in the range */
  619                         do {
  620                             tab[++c] = v;
  621                         } while (c < n);
  622                         c = n;
  623                         /*
  624                          * Alas, the V7 Unix scanf also treats formats
  625                          * such as [a-c-e] as `the letters a through e'.
  626                          * This too is permitted by the standard....
  627                          */
  628                         goto doswitch;
  629                         break;
  630 
  631                 case ']':               /* end of scanset */
  632                         return (fmt);
  633 
  634                 default:                /* just another character */
  635                         c = n;
  636                         break;
  637                 }
  638         }
  639         /* NOTREACHED */
  640 }
  641 

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