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  * 4. 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
  30 #ifndef lint
  31 #if 0
  32 static char sccsid[] = "@(#)display.c   8.1 (Berkeley) 6/6/93";
  33 #endif
  34 #endif /* not lint */
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  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 void print(PR *, u_char *);
  55
  56 void
  57 display(void)
  58 {
  59         FS *fs;
  60         FU *fu;
  61         PR *pr;
  62         int cnt;
  63         u_char *bp;
  64         off_t saveaddress;
  65         u_char savech, *savebp;
  66
  67         savech = 0;
  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 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, eaddress ? eaddress - address :
 133                     blocksize - address % blocksize);
 134                 break;
 135         case F_CHAR:
 136                 (void)printf(pr->fmt, *bp);
 137                 break;
 138         case F_DBL:
 139                 switch(pr->bcnt) {
 140                 case 4:
 141                         bcopy(bp, &f4, sizeof(f4));
 142                         (void)printf(pr->fmt, f4);
 143                         break;
 144                 case 8:
 145                         bcopy(bp, &f8, sizeof(f8));
 146                         (void)printf(pr->fmt, f8);
 147                         break;
 148                 default:
 149                         if (pr->bcnt == sizeof(long double)) {
 150                                 bcopy(bp, &ldbl, sizeof(ldbl));
 151                                 (void)printf(pr->fmt, ldbl);
 152                         }
 153                         break;
 154                 }
 155                 break;
 156         case F_INT:
 157                 switch(pr->bcnt) {
 158                 case 1:
 159                         (void)printf(pr->fmt, (quad_t)(signed char)*bp);
 160                         break;
 161                 case 2:
 162                         bcopy(bp, &s2, sizeof(s2));
 163                         (void)printf(pr->fmt, (quad_t)s2);
 164                         break;
 165                 case 4:
 166                         bcopy(bp, &s4, sizeof(s4));
 167                         (void)printf(pr->fmt, (quad_t)s4);
 168                         break;
 169                 case 8:
 170                         bcopy(bp, &s8, sizeof(s8));
 171                         (void)printf(pr->fmt, s8);
 172                         break;
 173                 }
 174                 break;
 175         case F_P:
 176                 (void)printf(pr->fmt, isprint(*bp) ? *bp : '.');
 177                 break;
 178         case F_STR:
 179                 (void)printf(pr->fmt, (char *)bp);
 180                 break;
 181         case F_TEXT:
 182                 (void)printf("%s", pr->fmt);
 183                 break;
 184         case F_U:
 185                 conv_u(pr, bp);
 186                 break;
 187         case F_UINT:
 188                 switch(pr->bcnt) {
 189                 case 1:
 190                         (void)printf(pr->fmt, (u_quad_t)*bp);
 191                         break;
 192                 case 2:
 193                         bcopy(bp, &u2, sizeof(u2));
 194                         (void)printf(pr->fmt, (u_quad_t)u2);
 195                         break;
 196                 case 4:
 197                         bcopy(bp, &u4, sizeof(u4));
 198                         (void)printf(pr->fmt, (u_quad_t)u4);
 199                         break;
 200                 case 8:
 201                         bcopy(bp, &u8, sizeof(u8));
 202                         (void)printf(pr->fmt, u8);
 203                         break;
 204                 }
 205                 break;
 206         }
 207 }
 208
 209 void
 210 bpad(PR *pr)
 211 {
 212         static char const *spec = " -0+#";
 213         char *p1, *p2;
 214
 215         /*
 216          * Remove all conversion flags; '-' is the only one valid
 217          * with %s, and it's not useful here.
 218          */
 219         pr->flags = F_BPAD;
 220         pr->cchar[0] = 's';
 221         pr->cchar[1] = '\0';
 222         for (p1 = pr->fmt; *p1 != '%'; ++p1);
 223         for (p2 = ++p1; *p1 && index(spec, *p1); ++p1);
 224         while ((*p2++ = *p1++));
 225 }
 226
 227 static char **_argv;
 228
 229 u_char *
 230 get(void)
 231 {
 232         static int ateof = 1;
 233         static u_char *curp, *savp;
 234         int n;
 235         int need, nread;
 236         int valid_save = 0;
 237         u_char *tmpp;
 238
 239         if (!curp) {
 240                 if ((curp = calloc(1, blocksize)) == NULL)
 241                         err(1, NULL);
 242                 if ((savp = calloc(1, blocksize)) == NULL)
 243                         err(1, NULL);
 244         } else {
 245                 tmpp = curp;
 246                 curp = savp;
 247                 savp = tmpp;
 248                 address += blocksize;
 249                 valid_save = 1;
 250         }
 251         for (need = blocksize, nread = 0;;) {
 252                 /*
 253                  * if read the right number of bytes, or at EOF for one file,
 254                  * and no other files are available, zero-pad the rest of the
 255                  * block and set the end flag.
 256                  */
 257                 if (!length || (ateof && !next((char **)NULL))) {
 258                         if (odmode && address < skip)
 259                                 errx(1, "cannot skip past end of input");
 260                         if (need == blocksize)
 261                                 return((u_char *)NULL);
 262                         /*
 263                          * XXX bcmp() is not quite right in the presence
 264                          * of multibyte characters.
 265                          */
 266                         if (vflag != ALL &&
 267                             valid_save &&
 268                             bcmp(curp, savp, nread) == 0) {
 269                                 if (vflag != DUP)
 270                                         (void)printf("*\n");
 271                                 return((u_char *)NULL);
 272                         }
 273                         bzero((char *)curp + nread, need);
 274                         eaddress = address + nread;
 275                         return(curp);
 276                 }
 277                 n = fread((char *)curp + nread, sizeof(u_char),
 278                     length == -1 ? need : MIN(length, need), stdin);
 279                 if (!n) {
 280                         if (ferror(stdin))
 281                                 warn("%s", _argv[-1]);
 282                         ateof = 1;
 283                         continue;
 284                 }
 285                 ateof = 0;
 286                 if (length != -1)
 287                         length -= n;
 288                 if (!(need -= n)) {
 289                         /*
 290                          * XXX bcmp() is not quite right in the presence
 291                          * of multibyte characters.
 292                          */
 293                         if (vflag == ALL || vflag == FIRST ||
 294                             valid_save == 0 ||
 295                             bcmp(curp, savp, blocksize) != 0) {
 296                                 if (vflag == DUP || vflag == FIRST)
 297                                         vflag = WAIT;
 298                                 return(curp);
 299                         }
 300                         if (vflag == WAIT)
 301                                 (void)printf("*\n");
 302                         vflag = DUP;
 303                         address += blocksize;
 304                         need = blocksize;
 305                         nread = 0;
 306                 }
 307                 else
 308                         nread += n;
 309         }
 310 }
 311
 312 size_t
 313 peek(u_char *buf, size_t nbytes)
 314 {
 315         size_t n, nread;
 316         int c;
 317
 318         if (length != -1 && nbytes > (unsigned int)length)
 319                 nbytes = length;
 320         nread = 0;
 321         while (nread < nbytes && (c = getchar()) != EOF) {
 322                 *buf++ = c;
 323                 nread++;
 324         }
 325         n = nread;
 326         while (n-- > 0) {
 327                 c = *--buf;
 328                 ungetc(c, stdin);
 329         }
 330         return (nread);
 331 }
 332
 333 int
 334 next(char **argv)
 335 {
 336         static int done;
 337         int statok;
 338
 339         if (argv) {
 340                 _argv = argv;
 341                 return(1);
 342         }
 343         for (;;) {
 344                 if (*_argv) {
 345                         done = 1;
 346                         if (!(freopen(*_argv, "r", stdin))) {
 347                                 warn("%s", *_argv);
 348                                 exitval = 1;
 349                                 ++_argv;
 350                                 continue;
 351                         }
 352                         statok = 1;
 353                 } else {
 354                         if (done++)
 355                                 return(0);
 356                         statok = 0;
 357                 }
 358                 if (skip)
 359                         doskip(statok ? *_argv : "stdin", statok);
 360                 if (*_argv)
 361                         ++_argv;
 362                 if (!skip)
 363                         return(1);
 364         }
 365         /* NOTREACHED */
 366 }
 367
 368 void
 369 doskip(const char *fname, int statok)
 370 {
 371         int cnt;
 372         struct stat sb;
 373
 374         if (statok) {
 375                 if (fstat(fileno(stdin), &sb))
 376                         err(1, "%s", fname);
 377                 if (S_ISREG(sb.st_mode) && skip >= sb.st_size) {
 378                         address += sb.st_size;
 379                         skip -= sb.st_size;
 380                         return;
 381                 }
 382         }
 383         if (S_ISREG(sb.st_mode)) {
 384                 if (fseeko(stdin, skip, SEEK_SET))
 385                         err(1, "%s", fname);
 386                 address += skip;
 387                 skip = 0;
 388         } else {
 389                 for (cnt = 0; cnt < skip; ++cnt)
 390                         if (getchar() == EOF)
 391                                 break;
 392                 address += cnt;
 393                 skip -= cnt;
 394         }
 395 }