lib/libc/gen/fmtcheck.c

   1 /*-
   2  * Copyright (c) 2000 The NetBSD Foundation, Inc.
   3  * All rights reserved.
   4  *
   5  * This code was contributed to The NetBSD Foundation by Allen Briggs.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *        This product includes software developed by the NetBSD
  18  *        Foundation, Inc. and its contributors.
  19  * 4. Neither the name of The NetBSD Foundation nor the names of its
  20  *    contributors may be used to endorse or promote products derived
  21  *    from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  33  * POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /*      $NetBSD: fmtcheck.c,v 1.2 2000/11/01 01:17:20 briggs Exp $      */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD$");
  39
  40 #include <stdio.h>
  41 #include <string.h>
  42 #include <ctype.h>
  43
  44 __weak_reference(__fmtcheck, fmtcheck);
  45
  46 enum __e_fmtcheck_types {
  47         FMTCHECK_START,
  48         FMTCHECK_SHORT,
  49         FMTCHECK_INT,
  50         FMTCHECK_LONG,
  51         FMTCHECK_QUAD,
  52         FMTCHECK_PTRDIFFT,
  53         FMTCHECK_SIZET,
  54         FMTCHECK_SHORTPOINTER,
  55         FMTCHECK_INTPOINTER,
  56         FMTCHECK_LONGPOINTER,
  57         FMTCHECK_QUADPOINTER,
  58         FMTCHECK_PTRDIFFTPOINTER,
  59         FMTCHECK_SIZETPOINTER,
  60 #ifndef NO_FLOATING_POINT
  61         FMTCHECK_DOUBLE,
  62         FMTCHECK_LONGDOUBLE,
  63 #endif
  64         FMTCHECK_STRING,
  65         FMTCHECK_WIDTH,
  66         FMTCHECK_PRECISION,
  67         FMTCHECK_DONE,
  68         FMTCHECK_UNKNOWN
  69 };
  70 typedef enum __e_fmtcheck_types EFT;
  71
  72 #define RETURN(pf,f,r) do { \
  73                         *(pf) = (f); \
  74                         return r; \
  75                        } /*NOTREACHED*/ /*CONSTCOND*/ while (0)
  76
  77 static EFT
  78 get_next_format_from_precision(const char **pf)
  79 {
  80         int             sh, lg, quad, longdouble, ptrdifft, sizet;
  81         const char      *f;
  82
  83         sh = lg = quad = longdouble = ptrdifft = sizet = 0;
  84
  85         f = *pf;
  86         switch (*f) {
  87         case 'h':
  88                 f++;
  89                 sh = 1;
  90                 break;
  91         case 'l':
  92                 f++;
  93                 if (!*f) RETURN(pf,f,FMTCHECK_UNKNOWN);
  94                 if (*f == 'l') {
  95                         f++;
  96                         quad = 1;
  97                 } else {
  98                         lg = 1;
  99                 }
 100                 break;
 101         case 'q':
 102                 f++;
 103                 quad = 1;
 104                 break;
 105         case 't':
 106                 f++;
 107                 ptrdifft = 1;
 108                 break;
 109         case 'z':
 110                 f++;
 111                 sizet = 1;
 112                 break;
 113         case 'L':
 114                 f++;
 115                 longdouble = 1;
 116                 break;
 117         default:
 118                 break;
 119         }
 120         if (!*f) RETURN(pf,f,FMTCHECK_UNKNOWN);
 121         if (strchr("diouxX", *f)) {
 122                 if (longdouble)
 123                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 124                 if (lg)
 125                         RETURN(pf,f,FMTCHECK_LONG);
 126                 if (quad)
 127                         RETURN(pf,f,FMTCHECK_QUAD);
 128                 if (ptrdifft)
 129                         RETURN(pf,f,FMTCHECK_PTRDIFFT);
 130                 if (sizet)
 131                         RETURN(pf,f,FMTCHECK_SIZET);
 132                 RETURN(pf,f,FMTCHECK_INT);
 133         }
 134         if (*f == 'n') {
 135                 if (longdouble)
 136                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 137                 if (sh)
 138                         RETURN(pf,f,FMTCHECK_SHORTPOINTER);
 139                 if (lg)
 140                         RETURN(pf,f,FMTCHECK_LONGPOINTER);
 141                 if (quad)
 142                         RETURN(pf,f,FMTCHECK_QUADPOINTER);
 143                 if (ptrdifft)
 144                         RETURN(pf,f,FMTCHECK_PTRDIFFTPOINTER);
 145                 if (sizet)
 146                         RETURN(pf,f,FMTCHECK_SIZETPOINTER);
 147                 RETURN(pf,f,FMTCHECK_INTPOINTER);
 148         }
 149         if (strchr("DOU", *f)) {
 150                 if (sh + lg + quad + longdouble + ptrdifft + sizet)
 151                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 152                 RETURN(pf,f,FMTCHECK_LONG);
 153         }
 154 #ifndef NO_FLOATING_POINT
 155         if (strchr("aAeEfFgG", *f)) {
 156                 if (longdouble)
 157                         RETURN(pf,f,FMTCHECK_LONGDOUBLE);
 158                 if (sh + lg + quad + ptrdifft + sizet)
 159                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 160                 RETURN(pf,f,FMTCHECK_DOUBLE);
 161         }
 162 #endif
 163         if (*f == 'c') {
 164                 if (sh + lg + quad + longdouble + ptrdifft + sizet)
 165                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 166                 RETURN(pf,f,FMTCHECK_INT);
 167         }
 168         if (*f == 's') {
 169                 if (sh + lg + quad + longdouble + ptrdifft + sizet)
 170                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 171                 RETURN(pf,f,FMTCHECK_STRING);
 172         }
 173         if (*f == 'p') {
 174                 if (sh + lg + quad + longdouble + ptrdifft + sizet)
 175                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 176                 RETURN(pf,f,FMTCHECK_LONG);
 177         }
 178         RETURN(pf,f,FMTCHECK_UNKNOWN);
 179         /*NOTREACHED*/
 180 }
 181
 182 static EFT
 183 get_next_format_from_width(const char **pf)
 184 {
 185         const char      *f;
 186
 187         f = *pf;
 188         if (*f == '.') {
 189                 f++;
 190                 if (*f == '*') {
 191                         RETURN(pf,f,FMTCHECK_PRECISION);
 192                 }
 193                 /* eat any precision (empty is allowed) */
 194                 while (isdigit(*f)) f++;
 195                 if (!*f) RETURN(pf,f,FMTCHECK_UNKNOWN);
 196         }
 197         RETURN(pf,f,get_next_format_from_precision(pf));
 198         /*NOTREACHED*/
 199 }
 200
 201 static EFT
 202 get_next_format(const char **pf, EFT eft)
 203 {
 204         int             infmt;
 205         const char      *f;
 206
 207         if (eft == FMTCHECK_WIDTH) {
 208                 (*pf)++;
 209                 return get_next_format_from_width(pf);
 210         } else if (eft == FMTCHECK_PRECISION) {
 211                 (*pf)++;
 212                 return get_next_format_from_precision(pf);
 213         }
 214
 215         f = *pf;
 216         infmt = 0;
 217         while (!infmt) {
 218                 f = strchr(f, '%');
 219                 if (f == NULL)
 220                         RETURN(pf,f,FMTCHECK_DONE);
 221                 f++;
 222                 if (!*f)
 223                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 224                 if (*f != '%')
 225                         infmt = 1;
 226                 else
 227                         f++;
 228         }
 229
 230         /* Eat any of the flags */
 231         while (*f && (strchr("#'0- +", *f)))
 232                 f++;
 233
 234         if (*f == '*') {
 235                 RETURN(pf,f,FMTCHECK_WIDTH);
 236         }
 237         /* eat any width */
 238         while (isdigit(*f)) f++;
 239         if (!*f) {
 240                 RETURN(pf,f,FMTCHECK_UNKNOWN);
 241         }
 242
 243         RETURN(pf,f,get_next_format_from_width(pf));
 244         /*NOTREACHED*/
 245 }
 246
 247 __const char *
 248 __fmtcheck(const char *f1, const char *f2)
 249 {
 250         const char      *f1p, *f2p;
 251         EFT             f1t, f2t;
 252
 253         if (!f1) return f2;
 254
 255         f1p = f1;
 256         f1t = FMTCHECK_START;
 257         f2p = f2;
 258         f2t = FMTCHECK_START;
 259         while ((f1t = get_next_format(&f1p, f1t)) != FMTCHECK_DONE) {
 260                 if (f1t == FMTCHECK_UNKNOWN)
 261                         return f2;
 262                 f2t = get_next_format(&f2p, f2t);
 263                 if (f1t != f2t)
 264                         return f2;
 265         }
 266         return f1;
 267 }