usr.bin/hexdump/display.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)display.c        8.1 (Berkeley) 6/6/93
  30  * $FreeBSD: src/usr.bin/hexdump/display.c,v 1.4.2.2 2002/07/23 14:27:06 tjr Exp $
  31  * $DragonFly: src/usr.bin/hexdump/display.c,v 1.6 2005/04/10 20:55:38 drhodus Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/stat.h>
  36
  37 #include <ctype.h>
  38 #include <err.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43 #include "hexdump.h"
  44
  45 enum _vflag vflag = FIRST;
  46
  47 static off_t address;                   /* address/offset in stream */
  48 static off_t eaddress;                  /* end address */
  49
  50 static __inline void print(PR *, u_char *);
  51
  52 static __inline void
  53 print(PR *pr, u_char *bp)
  54 {
  55         long double ldbl;
  56            double f8;
  57             float f4;
  58           int16_t s2;
  59            int8_t s8;
  60           int32_t s4;
  61         u_int16_t u2;
  62         u_int32_t u4;
  63         u_int64_t u8;
  64
  65         switch(pr->flags) {
  66         case F_ADDRESS:
  67                 (void)printf(pr->fmt, (quad_t)address);
  68                 break;
  69         case F_BPAD:
  70                 (void)printf(pr->fmt, "");
  71                 break;
  72         case F_C:
  73                 conv_c(pr, bp);
  74                 break;
  75         case F_CHAR:
  76                 (void)printf(pr->fmt, *bp);
  77                 break;
  78         case F_DBL:
  79                 switch(pr->bcnt) {
  80                 case 4:
  81                         bcopy(bp, &f4, sizeof(f4));
  82                         (void)printf(pr->fmt, f4);
  83                         break;
  84                 case 8:
  85                         bcopy(bp, &f8, sizeof(f8));
  86                         (void)printf(pr->fmt, f8);
  87                         break;
  88                 default:
  89                         if (pr->bcnt == sizeof(long double)) {
  90                                 bcopy(bp, &ldbl, sizeof(ldbl));
  91                                 (void)printf(pr->fmt, ldbl);
  92                         }
  93                         break;
  94                 }
  95                 break;
  96         case F_INT:
  97                 switch(pr->bcnt) {
  98                 case 1:
  99                         (void)printf(pr->fmt, (quad_t)(signed char)*bp);
 100                         break;
 101                 case 2:
 102                         bcopy(bp, &s2, sizeof(s2));
 103                         (void)printf(pr->fmt, (quad_t)s2);
 104                         break;
 105                 case 4:
 106                         bcopy(bp, &s4, sizeof(s4));
 107                         (void)printf(pr->fmt, (quad_t)s4);
 108                         break;
 109                 case 8:
 110                         bcopy(bp, &s8, sizeof(s8));
 111                         (void)printf(pr->fmt, s8);
 112                         break;
 113                 }
 114                 break;
 115         case F_P:
 116                 (void)printf(pr->fmt, isprint(*bp) ? *bp : '.');
 117                 break;
 118         case F_STR:
 119                 (void)printf(pr->fmt, (char *)bp);
 120                 break;
 121         case F_TEXT:
 122                 (void)printf("%s", pr->fmt);
 123                 break;
 124         case F_U:
 125                 conv_u(pr, bp);
 126                 break;
 127         case F_UINT:
 128                 switch(pr->bcnt) {
 129                 case 1:
 130                         (void)printf(pr->fmt, (u_quad_t)*bp);
 131                         break;
 132                 case 2:
 133                         bcopy(bp, &u2, sizeof(u2));
 134                         (void)printf(pr->fmt, (u_quad_t)u2);
 135                         break;
 136                 case 4:
 137                         bcopy(bp, &u4, sizeof(u4));
 138                         (void)printf(pr->fmt, (u_quad_t)u4);
 139                         break;
 140                 case 8:
 141                         bcopy(bp, &u8, sizeof(u8));
 142                         (void)printf(pr->fmt, u8);
 143                         break;
 144                 }
 145                 break;
 146         }
 147 }
 148
 149 void
 150 display(void)
 151 {
 152
 153         FS *fs;
 154         FU *fu;
 155         PR *pr;
 156         int cnt;
 157         u_char *bp;
 158         off_t saveaddress;
 159         u_char savech = '\0', *savebp;
 160
 161         while ((bp = get()))
 162             for (fs = fshead, savebp = bp, saveaddress = address; fs;
 163                 fs = fs->nextfs, bp = savebp, address = saveaddress)
 164                     for (fu = fs->nextfu; fu; fu = fu->nextfu) {
 165                         if (fu->flags&F_IGNORE)
 166                                 break;
 167                         for (cnt = fu->reps; cnt; --cnt)
 168                             for (pr = fu->nextpr; pr; address += pr->bcnt,
 169                                 bp += pr->bcnt, pr = pr->nextpr) {
 170                                     if (eaddress && address >= eaddress &&
 171                                         !(pr->flags & (F_TEXT|F_BPAD)))
 172                                             bpad(pr);
 173                                     if (cnt == 1 && pr->nospace) {
 174                                         savech = *pr->nospace;
 175                                         *pr->nospace = '\0';
 176                                     }
 177                                     print(pr, bp);
 178                                     if (cnt == 1 && pr->nospace)
 179                                         *pr->nospace = savech;
 180                             }
 181                     }
 182         if (endfu) {
 183                 /*
 184                  * If eaddress not set, error or file size was multiple of
 185                  * blocksize, and no partial block ever found.
 186                  */
 187                 if (!eaddress) {
 188                         if (!address)
 189                                 return;
 190                         eaddress = address;
 191                 }
 192                 for (pr = endfu->nextpr; pr; pr = pr->nextpr)
 193                         switch(pr->flags) {
 194                         case F_ADDRESS:
 195                                 (void)printf(pr->fmt, (quad_t)eaddress);
 196                                 break;
 197                         case F_TEXT:
 198                                 (void)printf("%s", pr->fmt);
 199                                 break;
 200                         }
 201         }
 202 }
 203
 204 void
 205 bpad(PR *pr)
 206 {
 207         static char const *spec = " -0+#";
 208         char *p1, *p2;
 209
 210         /*
 211          * Remove all conversion flags; '-' is the only one valid
 212          * with %s, and it's not useful here.
 213          */
 214         pr->flags = F_BPAD;
 215         pr->cchar[0] = 's';
 216         pr->cchar[1] = '\0';
 217         for (p1 = pr->fmt; *p1 != '%'; ++p1);
 218         for (p2 = ++p1; *p1 && strchr(spec, *p1); ++p1);
 219         while ((*p2++ = *p1++));
 220 }
 221
 222 static char **_argv;
 223
 224 u_char *
 225 get(void)
 226 {
 227         static int ateof = 1;
 228         static u_char *curp, *savp;
 229         int n;
 230         int need, nread;
 231         int valid_save = 0;
 232         u_char *tmpp;
 233
 234         if (!curp) {
 235                 if ((curp = calloc(1, blocksize)) == NULL)
 236                         err(1, NULL);
 237                 if ((savp = calloc(1, blocksize)) == NULL)
 238                         err(1, NULL);
 239         } else {
 240                 tmpp = curp;
 241                 curp = savp;
 242                 savp = tmpp;
 243                 address += blocksize;
 244                 valid_save = 1;
 245         }
 246         for (need = blocksize, nread = 0;;) {
 247                 /*
 248                  * if read the right number of bytes, or at EOF for one file,
 249                  * and no other files are available, zero-pad the rest of the
 250                  * block and set the end flag.
 251                  */
 252                 if (!length || (ateof && !next(NULL))) {
 253                         if (odmode && address < skip)
 254                                 errx(1, "cannot skip past end of input");
 255                         if (need == blocksize)
 256                                 return(NULL);
 257                         if (vflag != ALL &&
 258                             valid_save &&
 259                             bcmp(curp, savp, nread) == 0) {
 260                                 if (vflag != DUP)
 261                                         (void)printf("*\n");
 262                                 return(NULL);
 263                         }
 264                         bzero((char *)curp + nread, need);
 265                         eaddress = address + nread;
 266                         return(curp);
 267                 }
 268                 n = fread((char *)curp + nread, sizeof(u_char),
 269                     length == -1 ? need : MIN(length, need), stdin);
 270                 if (!n) {
 271                         if (ferror(stdin))
 272                                 warn("%s", _argv[-1]);
 273                         ateof = 1;
 274                         continue;
 275                 }
 276                 ateof = 0;
 277                 if (length != -1)
 278                         length -= n;
 279                 if (!(need -= n)) {
 280                         if (vflag == ALL || vflag == FIRST ||
 281                             valid_save == 0 ||
 282                             bcmp(curp, savp, blocksize) != 0) {
 283                                 if (vflag == DUP || vflag == FIRST)
 284                                         vflag = WAIT;
 285                                 return(curp);
 286                         }
 287                         if (vflag == WAIT)
 288                                 (void)printf("*\n");
 289                         vflag = DUP;
 290                         address += blocksize;
 291                         need = blocksize;
 292                         nread = 0;
 293                 }
 294                 else
 295                         nread += n;
 296         }
 297 }
 298
 299 int
 300 next(char **argv)
 301 {
 302         static int done;
 303
 304         if (argv) {
 305                 _argv = argv;
 306                 return(1);
 307         }
 308         for (;;) {
 309                 if (*_argv) {
 310                         if (!(freopen(*_argv, "r", stdin))) {
 311                                 warn("%s", *_argv);
 312                                 exitval = 1;
 313                                 ++_argv;
 314                                 continue;
 315                         }
 316                         done = 1;
 317                 } else {
 318                         if (done++)
 319                                 return(0);
 320                 }
 321                 if (skip)
 322                         doskip(*_argv ? *_argv : "stdin");
 323                 if (*_argv)
 324                         ++_argv;
 325                 if (!skip)
 326                         return(1);
 327         }
 328         /* NOTREACHED */
 329 }
 330
 331 void
 332 doskip(const char *fname)
 333 {
 334         int cnt;
 335         struct stat sb;
 336
 337         if (fstat(fileno(stdin), &sb))
 338                 err(1, "%s", fname);
 339         if (S_ISREG(sb.st_mode) && skip >= sb.st_size) {
 340                 address += sb.st_size;
 341                 skip -= sb.st_size;
 342         } else if (S_ISREG(sb.st_mode)) {
 343                 if (fseeko(stdin, skip, SEEK_SET))
 344                         err(1, "%s", fname);
 345                 address += skip;
 346                 skip = 0;
 347         } else {
 348                 for (cnt = 0; cnt < skip; ++cnt)
 349                         if (getchar() == EOF)
 350                                 break;
 351                 address += cnt;
 352                 skip -= cnt;
 353         }
 354 }