The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Chris Torek.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  * From: Id: vfscanf.c,v 1.13 1998/09/25 12:20:27 obrien Exp 
   35  * From: static char sccsid[] = "@(#)strtol.c   8.1 (Berkeley) 6/4/93";
   36  * From: static char sccsid[] = "@(#)strtoul.c  8.1 (Berkeley) 6/4/93";
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD$");
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/ctype.h>
   45 #include <sys/limits.h>
   46 #include <sys/stddef.h>
   47 
   48 /*
   49  * Note that stdarg.h and the ANSI style va_start macro is used for both
   50  * ANSI and traditional C compilers.
   51  */
   52 #include <machine/stdarg.h>
   53 
   54 #define BUF             32      /* Maximum length of numeric string. */
   55 
   56 /*
   57  * Flags used during conversion.
   58  */
   59 #define LONG            0x01    /* l: long or double */
   60 #define SHORT           0x04    /* h: short */
   61 #define SUPPRESS        0x08    /* suppress assignment */
   62 #define POINTER         0x10    /* weird %p pointer (`fake hex') */
   63 #define NOSKIP          0x20    /* do not skip blanks */
   64 #define QUAD            0x400
   65 #define INTMAXT         0x800   /* j: intmax_t */
   66 #define PTRDIFFT        0x1000  /* t: ptrdiff_t */
   67 #define SIZET           0x2000  /* z: size_t */
   68 #define SHORTSHORT      0x4000  /** hh: char */
   69 
   70 /*
   71  * The following are used in numeric conversions only:
   72  * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
   73  * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
   74  */
   75 #define SIGNOK          0x40    /* +/- is (still) legal */
   76 #define NDIGITS         0x80    /* no digits detected */
   77 
   78 #define DPTOK           0x100   /* (float) decimal point is still legal */
   79 #define EXPOK           0x200   /* (float) exponent (e+3, etc) still legal */
   80 
   81 #define PFXOK           0x100   /* 0x prefix is (still) legal */
   82 #define NZDIGITS        0x200   /* no zero digits detected */
   83 
   84 /*
   85  * Conversion types.
   86  */
   87 #define CT_CHAR         0       /* %c conversion */
   88 #define CT_CCL          1       /* %[...] conversion */
   89 #define CT_STRING       2       /* %s conversion */
   90 #define CT_INT          3       /* integer, i.e., strtoq or strtouq */
   91 typedef u_quad_t (*ccfntype)(const char *, char **, int);
   92 
   93 static const u_char *__sccl(char *, const u_char *);
   94 
   95 int
   96 sscanf(const char *ibuf, const char *fmt, ...)
   97 {
   98         va_list ap;
   99         int ret;
  100         
  101         va_start(ap, fmt);
  102         ret = vsscanf(ibuf, fmt, ap);
  103         va_end(ap);
  104         return(ret);
  105 }
  106 
  107 int
  108 vsscanf(const char *inp, char const *fmt0, va_list ap)
  109 {
  110         int inr;
  111         const u_char *fmt = (const u_char *)fmt0;
  112         int c;                  /* character from format, or conversion */
  113         size_t width;           /* field width, or 0 */
  114         char *p;                /* points into all kinds of strings */
  115         int n;                  /* handy integer */
  116         int flags;              /* flags as defined above */
  117         char *p0;               /* saves original value of p when necessary */
  118         int nassigned;          /* number of fields assigned */
  119         int nconversions;       /* number of conversions */
  120         int nread;              /* number of characters consumed from fp */
  121         int base;               /* base argument to strtoq/strtouq */
  122         ccfntype ccfn;          /* conversion function (strtoq/strtouq) */
  123         char ccltab[256];       /* character class table for %[...] */
  124         char buf[BUF];          /* buffer for numeric conversions */
  125 
  126         /* `basefix' is used to avoid `if' tests in the integer scanner */
  127         static short basefix[17] =
  128                 { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
  129 
  130         inr = strlen(inp);
  131         
  132         nassigned = 0;
  133         nconversions = 0;
  134         nread = 0;
  135         base = 0;               /* XXX just to keep gcc happy */
  136         ccfn = NULL;            /* XXX just to keep gcc happy */
  137         for (;;) {
  138                 c = *fmt++;
  139                 if (c == 0)
  140                         return (nassigned);
  141                 if (isspace(c)) {
  142                         while (inr > 0 && isspace(*inp))
  143                                 nread++, inr--, inp++;
  144                         continue;
  145                 }
  146                 if (c != '%')
  147                         goto literal;
  148                 width = 0;
  149                 flags = 0;
  150                 /*
  151                  * switch on the format.  continue if done;
  152                  * break once format type is derived.
  153                  */
  154 again:          c = *fmt++;
  155                 switch (c) {
  156                 case '%':
  157 literal:
  158                         if (inr <= 0)
  159                                 goto input_failure;
  160                         if (*inp != c)
  161                                 goto match_failure;
  162                         inr--, inp++;
  163                         nread++;
  164                         continue;
  165 
  166                 case '*':
  167                         flags |= SUPPRESS;
  168                         goto again;
  169                 case 'j':
  170                         flags |= INTMAXT;
  171                         goto again;
  172                 case 'l':
  173                         if (flags & LONG){
  174                                 flags &= ~LONG;
  175                                 flags |= QUAD;
  176                         } else {
  177                                 flags |= LONG;
  178                         }
  179                         goto again;
  180                 case 'q':
  181                         flags |= QUAD;
  182                         goto again;
  183                 case 't':
  184                         flags |= PTRDIFFT;
  185                         goto again;
  186                 case 'z':
  187                         flags |= SIZET;
  188                         goto again;
  189                 case 'h':
  190                         if (flags & SHORT){
  191                                 flags &= ~SHORT;
  192                                 flags |= SHORTSHORT;
  193                         } else {
  194                                 flags |= SHORT;
  195                         }
  196                         goto again;
  197 
  198                 case '': case '1': case '2': case '3': case '4':
  199                 case '5': case '6': case '7': case '8': case '9':
  200                         width = width * 10 + c - '';
  201                         goto again;
  202 
  203                 /*
  204                  * Conversions.
  205                  *
  206                  */
  207                 case 'd':
  208                         c = CT_INT;
  209                         ccfn = (ccfntype)strtoq;
  210                         base = 10;
  211                         break;
  212 
  213                 case 'i':
  214                         c = CT_INT;
  215                         ccfn = (ccfntype)strtoq;
  216                         base = 0;
  217                         break;
  218 
  219                 case 'o':
  220                         c = CT_INT;
  221                         ccfn = strtouq;
  222                         base = 8;
  223                         break;
  224 
  225                 case 'u':
  226                         c = CT_INT;
  227                         ccfn = strtouq;
  228                         base = 10;
  229                         break;
  230 
  231                 case 'x':
  232                         flags |= PFXOK; /* enable 0x prefixing */
  233                         c = CT_INT;
  234                         ccfn = strtouq;
  235                         base = 16;
  236                         break;
  237 
  238                 case 's':
  239                         c = CT_STRING;
  240                         break;
  241 
  242                 case '[':
  243                         fmt = __sccl(ccltab, fmt);
  244                         flags |= NOSKIP;
  245                         c = CT_CCL;
  246                         break;
  247 
  248                 case 'c':
  249                         flags |= NOSKIP;
  250                         c = CT_CHAR;
  251                         break;
  252 
  253                 case 'p':       /* pointer format is like hex */
  254                         flags |= POINTER | PFXOK;
  255                         c = CT_INT;
  256                         ccfn = strtouq;
  257                         base = 16;
  258                         break;
  259 
  260                 case 'n':
  261                         nconversions++;
  262                         if (flags & SUPPRESS)   /* ??? */
  263                                 continue;
  264                         if (flags & SHORTSHORT)
  265                                 *va_arg(ap, char *) = nread;
  266                         else if (flags & SHORT)
  267                                 *va_arg(ap, short *) = nread;
  268                         else if (flags & LONG)
  269                                 *va_arg(ap, long *) = nread;
  270                         else if (flags & QUAD)
  271                                 *va_arg(ap, quad_t *) = nread;
  272                         else if (flags & INTMAXT)
  273                                 *va_arg(ap, intmax_t *) = nread;
  274                         else if (flags & SIZET)
  275                                 *va_arg(ap, size_t *) = nread;
  276                         else if (flags & PTRDIFFT)
  277                                 *va_arg(ap, ptrdiff_t *) = nread;
  278                         else
  279                                 *va_arg(ap, int *) = nread;
  280                         continue;
  281                 }
  282 
  283                 /*
  284                  * We have a conversion that requires input.
  285                  */
  286                 if (inr <= 0)
  287                         goto input_failure;
  288 
  289                 /*
  290                  * Consume leading white space, except for formats
  291                  * that suppress this.
  292                  */
  293                 if ((flags & NOSKIP) == 0) {
  294                         while (isspace(*inp)) {
  295                                 nread++;
  296                                 if (--inr > 0)
  297                                         inp++;
  298                                 else 
  299                                         goto input_failure;
  300                         }
  301                         /*
  302                          * Note that there is at least one character in
  303                          * the buffer, so conversions that do not set NOSKIP
  304                          * can no longer result in an input failure.
  305                          */
  306                 }
  307 
  308                 /*
  309                  * Do the conversion.
  310                  */
  311                 switch (c) {
  312 
  313                 case CT_CHAR:
  314                         /* scan arbitrary characters (sets NOSKIP) */
  315                         if (width == 0)
  316                                 width = 1;
  317                         if (flags & SUPPRESS) {
  318                                 size_t sum = 0;
  319                                 for (;;) {
  320                                         if ((n = inr) < width) {
  321                                                 sum += n;
  322                                                 width -= n;
  323                                                 inp += n;
  324                                                 if (sum == 0)
  325                                                         goto input_failure;
  326                                                 break;
  327                                         } else {
  328                                                 sum += width;
  329                                                 inr -= width;
  330                                                 inp += width;
  331                                                 break;
  332                                         }
  333                                 }
  334                                 nread += sum;
  335                         } else {
  336                                 bcopy(inp, va_arg(ap, char *), width);
  337                                 inr -= width;
  338                                 inp += width;
  339                                 nread += width;
  340                                 nassigned++;
  341                         }
  342                         nconversions++;
  343                         break;
  344 
  345                 case CT_CCL:
  346                         /* scan a (nonempty) character class (sets NOSKIP) */
  347                         if (width == 0)
  348                                 width = (size_t)~0;     /* `infinity' */
  349                         /* take only those things in the class */
  350                         if (flags & SUPPRESS) {
  351                                 n = 0;
  352                                 while (ccltab[(unsigned char)*inp]) {
  353                                         n++, inr--, inp++;
  354                                         if (--width == 0)
  355                                                 break;
  356                                         if (inr <= 0) {
  357                                                 if (n == 0)
  358                                                         goto input_failure;
  359                                                 break;
  360                                         }
  361                                 }
  362                                 if (n == 0)
  363                                         goto match_failure;
  364                         } else {
  365                                 p0 = p = va_arg(ap, char *);
  366                                 while (ccltab[(unsigned char)*inp]) {
  367                                         inr--;
  368                                         *p++ = *inp++;
  369                                         if (--width == 0)
  370                                                 break;
  371                                         if (inr <= 0) {
  372                                                 if (p == p0)
  373                                                         goto input_failure;
  374                                                 break;
  375                                         }
  376                                 }
  377                                 n = p - p0;
  378                                 if (n == 0)
  379                                         goto match_failure;
  380                                 *p = 0;
  381                                 nassigned++;
  382                         }
  383                         nread += n;
  384                         nconversions++;
  385                         break;
  386 
  387                 case CT_STRING:
  388                         /* like CCL, but zero-length string OK, & no NOSKIP */
  389                         if (width == 0)
  390                                 width = (size_t)~0;
  391                         if (flags & SUPPRESS) {
  392                                 n = 0;
  393                                 while (!isspace(*inp)) {
  394                                         n++, inr--, inp++;
  395                                         if (--width == 0)
  396                                                 break;
  397                                         if (inr <= 0)
  398                                                 break;
  399                                 }
  400                                 nread += n;
  401                         } else {
  402                                 p0 = p = va_arg(ap, char *);
  403                                 while (!isspace(*inp)) {
  404                                         inr--;
  405                                         *p++ = *inp++;
  406                                         if (--width == 0)
  407                                                 break;
  408                                         if (inr <= 0)
  409                                                 break;
  410                                 }
  411                                 *p = 0;
  412                                 nread += p - p0;
  413                                 nassigned++;
  414                         }
  415                         nconversions++;
  416                         continue;
  417 
  418                 case CT_INT:
  419                         /* scan an integer as if by strtoq/strtouq */
  420 #ifdef hardway
  421                         if (width == 0 || width > sizeof(buf) - 1)
  422                                 width = sizeof(buf) - 1;
  423 #else
  424                         /* size_t is unsigned, hence this optimisation */
  425                         if (--width > sizeof(buf) - 2)
  426                                 width = sizeof(buf) - 2;
  427                         width++;
  428 #endif
  429                         flags |= SIGNOK | NDIGITS | NZDIGITS;
  430                         for (p = buf; width; width--) {
  431                                 c = *inp;
  432                                 /*
  433                                  * Switch on the character; `goto ok'
  434                                  * if we accept it as a part of number.
  435                                  */
  436                                 switch (c) {
  437 
  438                                 /*
  439                                  * The digit 0 is always legal, but is
  440                                  * special.  For %i conversions, if no
  441                                  * digits (zero or nonzero) have been
  442                                  * scanned (only signs), we will have
  443                                  * base==0.  In that case, we should set
  444                                  * it to 8 and enable 0x prefixing.
  445                                  * Also, if we have not scanned zero digits
  446                                  * before this, do not turn off prefixing
  447                                  * (someone else will turn it off if we
  448                                  * have scanned any nonzero digits).
  449                                  */
  450                                 case '':
  451                                         if (base == 0) {
  452                                                 base = 8;
  453                                                 flags |= PFXOK;
  454                                         }
  455                                         if (flags & NZDIGITS)
  456                                             flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
  457                                         else
  458                                             flags &= ~(SIGNOK|PFXOK|NDIGITS);
  459                                         goto ok;
  460 
  461                                 /* 1 through 7 always legal */
  462                                 case '1': case '2': case '3':
  463                                 case '4': case '5': case '6': case '7':
  464                                         base = basefix[base];
  465                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
  466                                         goto ok;
  467 
  468                                 /* digits 8 and 9 ok iff decimal or hex */
  469                                 case '8': case '9':
  470                                         base = basefix[base];
  471                                         if (base <= 8)
  472                                                 break;  /* not legal here */
  473                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
  474                                         goto ok;
  475 
  476                                 /* letters ok iff hex */
  477                                 case 'A': case 'B': case 'C':
  478                                 case 'D': case 'E': case 'F':
  479                                 case 'a': case 'b': case 'c':
  480                                 case 'd': case 'e': case 'f':
  481                                         /* no need to fix base here */
  482                                         if (base <= 10)
  483                                                 break;  /* not legal here */
  484                                         flags &= ~(SIGNOK | PFXOK | NDIGITS);
  485                                         goto ok;
  486 
  487                                 /* sign ok only as first character */
  488                                 case '+': case '-':
  489                                         if (flags & SIGNOK) {
  490                                                 flags &= ~SIGNOK;
  491                                                 goto ok;
  492                                         }
  493                                         break;
  494 
  495                                 /* x ok iff flag still set & 2nd char */
  496                                 case 'x': case 'X':
  497                                         if (flags & PFXOK && p == buf + 1) {
  498                                                 base = 16;      /* if %i */
  499                                                 flags &= ~PFXOK;
  500                                                 goto ok;
  501                                         }
  502                                         break;
  503                                 }
  504 
  505                                 /*
  506                                  * If we got here, c is not a legal character
  507                                  * for a number.  Stop accumulating digits.
  508                                  */
  509                                 break;
  510                 ok:
  511                                 /*
  512                                  * c is legal: store it and look at the next.
  513                                  */
  514                                 *p++ = c;
  515                                 if (--inr > 0)
  516                                         inp++;
  517                                 else 
  518                                         break;          /* end of input */
  519                         }
  520                         /*
  521                          * If we had only a sign, it is no good; push
  522                          * back the sign.  If the number ends in `x',
  523                          * it was [sign] '' 'x', so push back the x
  524                          * and treat it as [sign] ''.
  525                          */
  526                         if (flags & NDIGITS) {
  527                                 if (p > buf) {
  528                                         inp--;
  529                                         inr++;
  530                                 }
  531                                 goto match_failure;
  532                         }
  533                         c = ((u_char *)p)[-1];
  534                         if (c == 'x' || c == 'X') {
  535                                 --p;
  536                                 inp--;
  537                                 inr++;
  538                         }
  539                         if ((flags & SUPPRESS) == 0) {
  540                                 u_quad_t res;
  541 
  542                                 *p = 0;
  543                                 res = (*ccfn)(buf, (char **)NULL, base);
  544                                 if (flags & POINTER)
  545                                         *va_arg(ap, void **) =
  546                                                 (void *)(uintptr_t)res;
  547                                 else if (flags & SHORTSHORT)
  548                                         *va_arg(ap, char *) = res;
  549                                 else if (flags & SHORT)
  550                                         *va_arg(ap, short *) = res;
  551                                 else if (flags & LONG)
  552                                         *va_arg(ap, long *) = res;
  553                                 else if (flags & QUAD)
  554                                         *va_arg(ap, quad_t *) = res;
  555                                 else if (flags & INTMAXT)
  556                                         *va_arg(ap, intmax_t *) = res;
  557                                 else if (flags & PTRDIFFT)
  558                                         *va_arg(ap, ptrdiff_t *) = res;
  559                                 else if (flags & SIZET)
  560                                         *va_arg(ap, size_t *) = res;
  561                                 else
  562                                         *va_arg(ap, int *) = res;
  563                                 nassigned++;
  564                         }
  565                         nread += p - buf;
  566                         nconversions++;
  567                         break;
  568 
  569                 }
  570         }
  571 input_failure:
  572         return (nconversions != 0 ? nassigned : -1);
  573 match_failure:
  574         return (nassigned);
  575 }
  576 
  577 /*
  578  * Fill in the given table from the scanset at the given format
  579  * (just after `[').  Return a pointer to the character past the
  580  * closing `]'.  The table has a 1 wherever characters should be
  581  * considered part of the scanset.
  582  */
  583 static const u_char *
  584 __sccl(char *tab, const u_char *fmt)
  585 {
  586         int c, n, v;
  587 
  588         /* first `clear' the whole table */
  589         c = *fmt++;             /* first char hat => negated scanset */
  590         if (c == '^') {
  591                 v = 1;          /* default => accept */
  592                 c = *fmt++;     /* get new first char */
  593         } else
  594                 v = 0;          /* default => reject */
  595 
  596         /* XXX: Will not work if sizeof(tab*) > sizeof(char) */
  597         for (n = 0; n < 256; n++)
  598                      tab[n] = v;        /* memset(tab, v, 256) */
  599 
  600         if (c == 0)
  601                 return (fmt - 1);/* format ended before closing ] */
  602 
  603         /*
  604          * Now set the entries corresponding to the actual scanset
  605          * to the opposite of the above.
  606          *
  607          * The first character may be ']' (or '-') without being special;
  608          * the last character may be '-'.
  609          */
  610         v = 1 - v;
  611         for (;;) {
  612                 tab[c] = v;             /* take character c */
  613 doswitch:
  614                 n = *fmt++;             /* and examine the next */
  615                 switch (n) {
  616 
  617                 case 0:                 /* format ended too soon */
  618                         return (fmt - 1);
  619 
  620                 case '-':
  621                         /*
  622                          * A scanset of the form
  623                          *      [01+-]
  624                          * is defined as `the digit 0, the digit 1,
  625                          * the character +, the character -', but
  626                          * the effect of a scanset such as
  627                          *      [a-zA-Z0-9]
  628                          * is implementation defined.  The V7 Unix
  629                          * scanf treats `a-z' as `the letters a through
  630                          * z', but treats `a-a' as `the letter a, the
  631                          * character -, and the letter a'.
  632                          *
  633                          * For compatibility, the `-' is not considered
  634                          * to define a range if the character following
  635                          * it is either a close bracket (required by ANSI)
  636                          * or is not numerically greater than the character
  637                          * we just stored in the table (c).
  638                          */
  639                         n = *fmt;
  640                         if (n == ']' || n < c) {
  641                                 c = '-';
  642                                 break;  /* resume the for(;;) */
  643                         }
  644                         fmt++;
  645                         /* fill in the range */
  646                         do {
  647                             tab[++c] = v;
  648                         } while (c < n);
  649                         c = n;
  650                         /*
  651                          * Alas, the V7 Unix scanf also treats formats
  652                          * such as [a-c-e] as `the letters a through e'.
  653                          * This too is permitted by the standard....
  654                          */
  655                         goto doswitch;
  656                         break;
  657 
  658                 case ']':               /* end of scanset */
  659                         return (fmt);
  660 
  661                 default:                /* just another character */
  662                         c = n;
  663                         break;
  664                 }
  665         }
  666         /* NOTREACHED */
  667 }
  668 

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