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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)display.c        8.1 (Berkeley) 6/6/93
  34  * $FreeBSD: src/usr.bin/hexdump/display.c,v 1.4.2.2 2002/07/23 14:27:06 tjr Exp $
  35  * $DragonFly: src/usr.bin/hexdump/display.c,v 1.3 2003/10/04 20:36:45 hmp Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/stat.h>
  40
  41 #include <ctype.h>
  42 #include <err.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include "hexdump.h"
  48
  49 enum _vflag vflag = FIRST;
  50
  51 static off_t address;                   /* address/offset in stream */
  52 static off_t eaddress;                  /* end address */
  53
  54 static __inline void print(PR *, u_char *);
  55
  56 void
  57 display(void)
  58 {
  59         extern FU *endfu;
  60         register FS *fs;
  61         register FU *fu;
  62         register PR *pr;
  63         register int cnt;
  64         register u_char *bp;
  65         off_t saveaddress;
  66         u_char savech, *savebp;
  67
  68         while ((bp = get()))
  69             for (fs = fshead, savebp = bp, saveaddress = address; fs;
  70                 fs = fs->nextfs, bp = savebp, address = saveaddress)
  71                     for (fu = fs->nextfu; fu; fu = fu->nextfu) {
  72                         if (fu->flags&F_IGNORE)
  73                                 break;
  74                         for (cnt = fu->reps; cnt; --cnt)
  75                             for (pr = fu->nextpr; pr; address += pr->bcnt,
  76                                 bp += pr->bcnt, pr = pr->nextpr) {
  77                                     if (eaddress && address >= eaddress &&
  78                                         !(pr->flags & (F_TEXT|F_BPAD)))
  79                                             bpad(pr);
  80                                     if (cnt == 1 && pr->nospace) {
  81                                         savech = *pr->nospace;
  82                                         *pr->nospace = '\0';
  83                                     }
  84                                     print(pr, bp);
  85                                     if (cnt == 1 && pr->nospace)
  86                                         *pr->nospace = savech;
  87                             }
  88                     }
  89         if (endfu) {
  90                 /*
  91                  * If eaddress not set, error or file size was multiple of
  92                  * blocksize, and no partial block ever found.
  93                  */
  94                 if (!eaddress) {
  95                         if (!address)
  96                                 return;
  97                         eaddress = address;
  98                 }
  99                 for (pr = endfu->nextpr; pr; pr = pr->nextpr)
 100                         switch(pr->flags) {
 101                         case F_ADDRESS:
 102                                 (void)printf(pr->fmt, (quad_t)eaddress);
 103                                 break;
 104                         case F_TEXT:
 105                                 (void)printf("%s", pr->fmt);
 106                                 break;
 107                         }
 108         }
 109 }
 110
 111 static __inline void
 112 print(PR *pr, u_char *bp)
 113 {
 114         long double ldbl;
 115            double f8;
 116             float f4;
 117           int16_t s2;
 118            int8_t s8;
 119           int32_t s4;
 120         u_int16_t u2;
 121         u_int32_t u4;
 122         u_int64_t u8;
 123
 124         switch(pr->flags) {
 125         case F_ADDRESS:
 126                 (void)printf(pr->fmt, (quad_t)address);
 127                 break;
 128         case F_BPAD:
 129                 (void)printf(pr->fmt, "");
 130                 break;
 131         case F_C:
 132                 conv_c(pr, bp);
 133                 break;
 134         case F_CHAR:
 135                 (void)printf(pr->fmt, *bp);
 136                 break;
 137         case F_DBL:
 138                 switch(pr->bcnt) {
 139                 case 4:
 140                         bcopy(bp, &f4, sizeof(f4));
 141                         (void)printf(pr->fmt, f4);
 142                         break;
 143                 case 8:
 144                         bcopy(bp, &f8, sizeof(f8));
 145                         (void)printf(pr->fmt, f8);
 146                         break;
 147                 default:
 148                         if (pr->bcnt == sizeof(long double)) {
 149                                 bcopy(bp, &ldbl, sizeof(ldbl));
 150                                 (void)printf(pr->fmt, ldbl);
 151                         }
 152                         break;
 153                 }
 154                 break;
 155         case F_INT:
 156                 switch(pr->bcnt) {
 157                 case 1:
 158                         (void)printf(pr->fmt, (quad_t)(signed char)*bp);
 159                         break;
 160                 case 2:
 161                         bcopy(bp, &s2, sizeof(s2));
 162                         (void)printf(pr->fmt, (quad_t)s2);
 163                         break;
 164                 case 4:
 165                         bcopy(bp, &s4, sizeof(s4));
 166                         (void)printf(pr->fmt, (quad_t)s4);
 167                         break;
 168                 case 8:
 169                         bcopy(bp, &s8, sizeof(s8));
 170                         (void)printf(pr->fmt, s8);
 171                         break;
 172                 }
 173                 break;
 174         case F_P:
 175                 (void)printf(pr->fmt, isprint(*bp) ? *bp : '.');
 176                 break;
 177         case F_STR:
 178                 (void)printf(pr->fmt, (char *)bp);
 179                 break;
 180         case F_TEXT:
 181                 (void)printf("%s", pr->fmt);
 182                 break;
 183         case F_U:
 184                 conv_u(pr, bp);
 185                 break;
 186         case F_UINT:
 187                 switch(pr->bcnt) {
 188                 case 1:
 189                         (void)printf(pr->fmt, (u_quad_t)*bp);
 190                         break;
 191                 case 2:
 192                         bcopy(bp, &u2, sizeof(u2));
 193                         (void)printf(pr->fmt, (u_quad_t)u2);
 194                         break;
 195                 case 4:
 196                         bcopy(bp, &u4, sizeof(u4));
 197                         (void)printf(pr->fmt, (u_quad_t)u4);
 198                         break;
 199                 case 8:
 200                         bcopy(bp, &u8, sizeof(u8));
 201                         (void)printf(pr->fmt, u8);
 202                         break;
 203                 }
 204                 break;
 205         }
 206 }
 207
 208 void
 209 bpad(PR *pr)
 210 {
 211         static char const *spec = " -0+#";
 212         register char *p1, *p2;
 213
 214         /*
 215          * Remove all conversion flags; '-' is the only one valid
 216          * with %s, and it's not useful here.
 217          */
 218         pr->flags = F_BPAD;
 219         pr->cchar[0] = 's';
 220         pr->cchar[1] = '\0';
 221         for (p1 = pr->fmt; *p1 != '%'; ++p1);
 222         for (p2 = ++p1; *p1 && index(spec, *p1); ++p1);
 223         while ((*p2++ = *p1++));
 224 }
 225
 226 static char **_argv;
 227
 228 u_char *
 229 get(void)
 230 {
 231         static int ateof = 1;
 232         static u_char *curp, *savp;
 233         register int n;
 234         int need, nread;
 235         int valid_save = 0;
 236         u_char *tmpp;
 237
 238         if (!curp) {
 239                 if ((curp = calloc(1, blocksize)) == NULL)
 240                         err(1, NULL);
 241                 if ((savp = calloc(1, blocksize)) == NULL)
 242                         err(1, NULL);
 243         } else {
 244                 tmpp = curp;
 245                 curp = savp;
 246                 savp = tmpp;
 247                 address += blocksize;
 248                 valid_save = 1;
 249         }
 250         for (need = blocksize, nread = 0;;) {
 251                 /*
 252                  * if read the right number of bytes, or at EOF for one file,
 253                  * and no other files are available, zero-pad the rest of the
 254                  * block and set the end flag.
 255                  */
 256                 if (!length || (ateof && !next((char **)NULL))) {
 257                         if (odmode && address < skip)
 258                                 errx(1, "cannot skip past end of input");
 259                         if (need == blocksize)
 260                                 return((u_char *)NULL);
 261                         if (vflag != ALL &&
 262                             valid_save &&
 263                             bcmp(curp, savp, nread) == 0) {
 264                                 if (vflag != DUP)
 265                                         (void)printf("*\n");
 266                                 return((u_char *)NULL);
 267                         }
 268                         bzero((char *)curp + nread, need);
 269                         eaddress = address + nread;
 270                         return(curp);
 271                 }
 272                 n = fread((char *)curp + nread, sizeof(u_char),
 273                     length == -1 ? need : MIN(length, need), stdin);
 274                 if (!n) {
 275                         if (ferror(stdin))
 276                                 warn("%s", _argv[-1]);
 277                         ateof = 1;
 278                         continue;
 279                 }
 280                 ateof = 0;
 281                 if (length != -1)
 282                         length -= n;
 283                 if (!(need -= n)) {
 284                         if (vflag == ALL || vflag == FIRST ||
 285                             valid_save == 0 ||
 286                             bcmp(curp, savp, blocksize) != 0) {
 287                                 if (vflag == DUP || vflag == FIRST)
 288                                         vflag = WAIT;
 289                                 return(curp);
 290                         }
 291                         if (vflag == WAIT)
 292                                 (void)printf("*\n");
 293                         vflag = DUP;
 294                         address += blocksize;
 295                         need = blocksize;
 296                         nread = 0;
 297                 }
 298                 else
 299                         nread += n;
 300         }
 301 }
 302
 303 int
 304 next(char **argv)
 305 {
 306         extern int exitval;
 307         static int done;
 308         int statok;
 309
 310         if (argv) {
 311                 _argv = argv;
 312                 return(1);
 313         }
 314         for (;;) {
 315                 if (*_argv) {
 316                         if (!(freopen(*_argv, "r", stdin))) {
 317                                 warn("%s", *_argv);
 318                                 exitval = 1;
 319                                 ++_argv;
 320                                 continue;
 321                         }
 322                         statok = done = 1;
 323                 } else {
 324                         if (done++)
 325                                 return(0);
 326                         statok = 0;
 327                 }
 328                 if (skip)
 329                         doskip(statok ? *_argv : "stdin", statok);
 330                 if (*_argv)
 331                         ++_argv;
 332                 if (!skip)
 333                         return(1);
 334         }
 335         /* NOTREACHED */
 336 }
 337
 338 void
 339 doskip(const char *fname, int statok)
 340 {
 341         register int cnt;
 342         struct stat sb;
 343
 344         if (statok) {
 345                 if (fstat(fileno(stdin), &sb))
 346                         err(1, "%s", fname);
 347                 if (S_ISREG(sb.st_mode) && skip >= sb.st_size) {
 348                         address += sb.st_size;
 349                         skip -= sb.st_size;
 350                         return;
 351                 }
 352         }
 353         if (S_ISREG(sb.st_mode)) {
 354                 if (fseeko(stdin, skip, SEEK_SET))
 355                         err(1, "%s", fname);
 356                 address += skip;
 357                 skip = 0;
 358         } else {
 359                 for (cnt = 0; cnt < skip; ++cnt)
 360                         if (getchar() == EOF)
 361                                 break;
 362                 address += cnt;
 363                 skip -= cnt;
 364         }
 365 }