lib/libc/gen/fmtcheck.c

   1 /*      $FreeBSD: src/lib/libc/gen/fmtcheck.c,v 1.1.2.1 2001/07/05 07:43:42 kris Exp $  */
   2 /*      $DragonFly: src/lib/libc/gen/fmtcheck.c,v 1.3 2003/08/22 19:31:21 asmodai Exp $ */
   3 /*      $NetBSD: fmtcheck.c,v 1.2 2000/11/01 01:17:20 briggs Exp $      */
   4
   5 /*-
   6  * Copyright (c) 2000 The NetBSD Foundation, Inc.
   7  * All rights reserved.
   8  *
   9  * This code was contributed to The NetBSD Foundation by Allen Briggs.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *        This product includes software developed by the NetBSD
  22  *        Foundation, Inc. and its contributors.
  23  * 4. Neither the name of The NetBSD Foundation nor the names of its
  24  *    contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  37  * POSSIBILITY OF SUCH DAMAGE.
  38  *
  39  * $FreeBSD: src/lib/libc/gen/fmtcheck.c,v 1.1.2.1 2001/07/05 07:43:42 kris Exp $
  40  */
  41
  42 #include <sys/cdefs.h>
  43
  44 #include <stdlib.h>
  45 #include <stdio.h>
  46 #include <string.h>
  47 #include <ctype.h>
  48
  49 #ifdef __weak_alias
  50 __weak_alias(fmtcheck,__fmtcheck)
  51 #endif
  52
  53 enum __e_fmtcheck_types {
  54         FMTCHECK_START,
  55         FMTCHECK_SHORT,
  56         FMTCHECK_INT,
  57         FMTCHECK_LONG,
  58         FMTCHECK_QUAD,
  59         FMTCHECK_SHORTPOINTER,
  60         FMTCHECK_INTPOINTER,
  61         FMTCHECK_LONGPOINTER,
  62         FMTCHECK_QUADPOINTER,
  63         FMTCHECK_DOUBLE,
  64         FMTCHECK_LONGDOUBLE,
  65         FMTCHECK_STRING,
  66         FMTCHECK_WIDTH,
  67         FMTCHECK_PRECISION,
  68         FMTCHECK_DONE,
  69         FMTCHECK_UNKNOWN
  70 };
  71 typedef enum __e_fmtcheck_types EFT;
  72
  73 #define RETURN(pf,f,r) do { \
  74                         *(pf) = (f); \
  75                         return r; \
  76                        } /*NOTREACHED*/ /*CONSTCOND*/ while (0)
  77
  78 static EFT
  79 get_next_format_from_precision(const char **pf)
  80 {
  81         int             sh, lg, quad, longdouble;
  82         const char      *f;
  83
  84         sh = lg = quad = longdouble = 0;
  85
  86         f = *pf;
  87         switch (*f) {
  88         case 'h':
  89                 f++;
  90                 sh = 1;
  91                 break;
  92         case 'l':
  93                 f++;
  94                 if (!*f) RETURN(pf,f,FMTCHECK_UNKNOWN);
  95                 if (*f == 'l') {
  96                         f++;
  97                         quad = 1;
  98                 } else {
  99                         lg = 1;
 100                 }
 101                 break;
 102         case 'q':
 103                 f++;
 104                 quad = 1;
 105                 break;
 106         case 'L':
 107                 f++;
 108                 longdouble = 1;
 109                 break;
 110         default:
 111                 break;
 112         }
 113         if (!*f) RETURN(pf,f,FMTCHECK_UNKNOWN);
 114         if (strchr("diouxX", *f)) {
 115                 if (longdouble)
 116                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 117                 if (lg)
 118                         RETURN(pf,f,FMTCHECK_LONG);
 119                 if (quad)
 120                         RETURN(pf,f,FMTCHECK_QUAD);
 121                 RETURN(pf,f,FMTCHECK_INT);
 122         }
 123         if (*f == 'n') {
 124                 if (longdouble)
 125                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 126                 if (sh)
 127                         RETURN(pf,f,FMTCHECK_SHORTPOINTER);
 128                 if (lg)
 129                         RETURN(pf,f,FMTCHECK_LONGPOINTER);
 130                 if (quad)
 131                         RETURN(pf,f,FMTCHECK_QUADPOINTER);
 132                 RETURN(pf,f,FMTCHECK_INTPOINTER);
 133         }
 134         if (strchr("DOU", *f)) {
 135                 if (sh + lg + quad + longdouble)
 136                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 137                 RETURN(pf,f,FMTCHECK_LONG);
 138         }
 139         if (strchr("eEfg", *f)) {
 140                 if (longdouble)
 141                         RETURN(pf,f,FMTCHECK_LONGDOUBLE);
 142                 if (sh + lg + quad)
 143                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 144                 RETURN(pf,f,FMTCHECK_DOUBLE);
 145         }
 146         if (*f == 'c') {
 147                 if (sh + lg + quad + longdouble)
 148                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 149                 RETURN(pf,f,FMTCHECK_INT);
 150         }
 151         if (*f == 's') {
 152                 if (sh + lg + quad + longdouble)
 153                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 154                 RETURN(pf,f,FMTCHECK_STRING);
 155         }
 156         if (*f == 'p') {
 157                 if (sh + lg + quad + longdouble)
 158                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 159                 RETURN(pf,f,FMTCHECK_LONG);
 160         }
 161         RETURN(pf,f,FMTCHECK_UNKNOWN);
 162         /*NOTREACHED*/
 163 }
 164
 165 static EFT
 166 get_next_format_from_width(const char **pf)
 167 {
 168         const char      *f;
 169
 170         f = *pf;
 171         if (*f == '.') {
 172                 f++;
 173                 if (*f == '*') {
 174                         RETURN(pf,f,FMTCHECK_PRECISION);
 175                 }
 176                 /* eat any precision (empty is allowed) */
 177                 while (isdigit(*f)) f++;
 178                 if (!*f) RETURN(pf,f,FMTCHECK_UNKNOWN);
 179         }
 180         RETURN(pf,f,get_next_format_from_precision(pf));
 181         /*NOTREACHED*/
 182 }
 183
 184 static EFT
 185 get_next_format(const char **pf, EFT eft)
 186 {
 187         int             infmt;
 188         const char      *f;
 189
 190         if (eft == FMTCHECK_WIDTH) {
 191                 (*pf)++;
 192                 return get_next_format_from_width(pf);
 193         } else if (eft == FMTCHECK_PRECISION) {
 194                 (*pf)++;
 195                 return get_next_format_from_precision(pf);
 196         }
 197
 198         f = *pf;
 199         infmt = 0;
 200         while (!infmt) {
 201                 f = strchr(f, '%');
 202                 if (f == NULL)
 203                         RETURN(pf,f,FMTCHECK_DONE);
 204                 f++;
 205                 if (!*f)
 206                         RETURN(pf,f,FMTCHECK_UNKNOWN);
 207                 if (*f != '%')
 208                         infmt = 1;
 209                 else
 210                         f++;
 211         }
 212
 213         /* Eat any of the flags */
 214         while (*f && (strchr("#0- +", *f)))
 215                 f++;
 216
 217         if (*f == '*') {
 218                 RETURN(pf,f,FMTCHECK_WIDTH);
 219         }
 220         /* eat any width */
 221         while (isdigit(*f)) f++;
 222         if (!*f) {
 223                 RETURN(pf,f,FMTCHECK_UNKNOWN);
 224         }
 225
 226         RETURN(pf,f,get_next_format_from_width(pf));
 227         /*NOTREACHED*/
 228 }
 229
 230 const char *
 231 fmtcheck(const char *f1, const char *f2)
 232 {
 233         const char      *f1p, *f2p;
 234         EFT             f1t, f2t;
 235
 236         if (!f1) return f2;
 237
 238         f1p = f1;
 239         f1t = FMTCHECK_START;
 240         f2p = f2;
 241         f2t = FMTCHECK_START;
 242         while ((f1t = get_next_format(&f1p, f1t)) != FMTCHECK_DONE) {
 243                 if (f1t == FMTCHECK_UNKNOWN)
 244                         return f2;
 245                 f2t = get_next_format(&f2p, f2t);
 246                 if (f1t != f2t)
 247                         return f2;
 248         }
 249         return f1;
 250 }