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
  34 #ifndef lint
  35 #if 0
  36 static char sccsid[] = "@(#)display.c   8.1 (Berkeley) 6/6/93";
  37 #endif
  38 #endif /* not lint */
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD$");
  41
  42 #include <sys/param.h>
  43 #include <sys/stat.h>
  44
  45 #include <ctype.h>
  46 #include <err.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51 #include "hexdump.h"
  52
  53 enum _vflag vflag = FIRST;
  54
  55 static off_t address;                   /* address/offset in stream */
  56 static off_t eaddress;                  /* end address */
  57
  58 static void print(PR *, u_char *);
  59
  60 void
  61 display(void)
  62 {
  63         FS *fs;
  64         FU *fu;
  65         PR *pr;
  66         int cnt;
  67         u_char *bp;
  68         off_t saveaddress;
  69         u_char savech, *savebp;
  70
  71         savech = 0;
  72         while ((bp = get()))
  73             for (fs = fshead, savebp = bp, saveaddress = address; fs;
  74                 fs = fs->nextfs, bp = savebp, address = saveaddress)
  75                     for (fu = fs->nextfu; fu; fu = fu->nextfu) {
  76                         if (fu->flags&F_IGNORE)
  77                                 break;
  78                         for (cnt = fu->reps; cnt; --cnt)
  79                             for (pr = fu->nextpr; pr; address += pr->bcnt,
  80                                 bp += pr->bcnt, pr = pr->nextpr) {
  81                                     if (eaddress && address >= eaddress &&
  82                                         !(pr->flags & (F_TEXT|F_BPAD)))
  83                                             bpad(pr);
  84                                     if (cnt == 1 && pr->nospace) {
  85                                         savech = *pr->nospace;
  86                                         *pr->nospace = '\0';
  87                                     }
  88                                     print(pr, bp);
  89                                     if (cnt == 1 && pr->nospace)
  90                                         *pr->nospace = savech;
  91                             }
  92                     }
  93         if (endfu) {
  94                 /*
  95                  * If eaddress not set, error or file size was multiple of
  96                  * blocksize, and no partial block ever found.
  97                  */
  98                 if (!eaddress) {
  99                         if (!address)
 100                                 return;
 101                         eaddress = address;
 102                 }
 103                 for (pr = endfu->nextpr; pr; pr = pr->nextpr)
 104                         switch(pr->flags) {
 105                         case F_ADDRESS:
 106                                 (void)printf(pr->fmt, (quad_t)eaddress);
 107                                 break;
 108                         case F_TEXT:
 109                                 (void)printf("%s", pr->fmt);
 110                                 break;
 111                         }
 112         }
 113 }
 114
 115 static void
 116 print(PR *pr, u_char *bp)
 117 {
 118         long double ldbl;
 119            double f8;
 120             float f4;
 121           int16_t s2;
 122            int8_t s8;
 123           int32_t s4;
 124         u_int16_t u2;
 125         u_int32_t u4;
 126         u_int64_t u8;
 127
 128         switch(pr->flags) {
 129         case F_ADDRESS:
 130                 (void)printf(pr->fmt, (quad_t)address);
 131                 break;
 132         case F_BPAD:
 133                 (void)printf(pr->fmt, "");
 134                 break;
 135         case F_C:
 136                 conv_c(pr, bp, eaddress ? eaddress - address :
 137                     blocksize - address % blocksize);
 138                 break;
 139         case F_CHAR:
 140                 (void)printf(pr->fmt, *bp);
 141                 break;
 142         case F_DBL:
 143                 switch(pr->bcnt) {
 144                 case 4:
 145                         bcopy(bp, &f4, sizeof(f4));
 146                         (void)printf(pr->fmt, f4);
 147                         break;
 148                 case 8:
 149                         bcopy(bp, &f8, sizeof(f8));
 150                         (void)printf(pr->fmt, f8);
 151                         break;
 152                 default:
 153                         if (pr->bcnt == sizeof(long double)) {
 154                                 bcopy(bp, &ldbl, sizeof(ldbl));
 155                                 (void)printf(pr->fmt, ldbl);
 156                         }
 157                         break;
 158                 }
 159                 break;
 160         case F_INT:
 161                 switch(pr->bcnt) {
 162                 case 1:
 163                         (void)printf(pr->fmt, (quad_t)(signed char)*bp);
 164                         break;
 165                 case 2:
 166                         bcopy(bp, &s2, sizeof(s2));
 167                         (void)printf(pr->fmt, (quad_t)s2);
 168                         break;
 169                 case 4:
 170                         bcopy(bp, &s4, sizeof(s4));
 171                         (void)printf(pr->fmt, (quad_t)s4);
 172                         break;
 173                 case 8:
 174                         bcopy(bp, &s8, sizeof(s8));
 175                         (void)printf(pr->fmt, s8);
 176                         break;
 177                 }
 178                 break;
 179         case F_P:
 180                 (void)printf(pr->fmt, isprint(*bp) ? *bp : '.');
 181                 break;
 182         case F_STR:
 183                 (void)printf(pr->fmt, (char *)bp);
 184                 break;
 185         case F_TEXT:
 186                 (void)printf("%s", pr->fmt);
 187                 break;
 188         case F_U:
 189                 conv_u(pr, bp);
 190                 break;
 191         case F_UINT:
 192                 switch(pr->bcnt) {
 193                 case 1:
 194                         (void)printf(pr->fmt, (u_quad_t)*bp);
 195                         break;
 196                 case 2:
 197                         bcopy(bp, &u2, sizeof(u2));
 198                         (void)printf(pr->fmt, (u_quad_t)u2);
 199                         break;
 200                 case 4:
 201                         bcopy(bp, &u4, sizeof(u4));
 202                         (void)printf(pr->fmt, (u_quad_t)u4);
 203                         break;
 204                 case 8:
 205                         bcopy(bp, &u8, sizeof(u8));
 206                         (void)printf(pr->fmt, u8);
 207                         break;
 208                 }
 209                 break;
 210         }
 211 }
 212
 213 void
 214 bpad(PR *pr)
 215 {
 216         static char const *spec = " -0+#";
 217         char *p1, *p2;
 218
 219         /*
 220          * Remove all conversion flags; '-' is the only one valid
 221          * with %s, and it's not useful here.
 222          */
 223         pr->flags = F_BPAD;
 224         pr->cchar[0] = 's';
 225         pr->cchar[1] = '\0';
 226         for (p1 = pr->fmt; *p1 != '%'; ++p1);
 227         for (p2 = ++p1; *p1 && index(spec, *p1); ++p1);
 228         while ((*p2++ = *p1++));
 229 }
 230
 231 static char **_argv;
 232
 233 u_char *
 234 get(void)
 235 {
 236         static int ateof = 1;
 237         static u_char *curp, *savp;
 238         int n;
 239         int need, nread;
 240         int valid_save = 0;
 241         u_char *tmpp;
 242
 243         if (!curp) {
 244                 if ((curp = calloc(1, blocksize)) == NULL)
 245                         err(1, NULL);
 246                 if ((savp = calloc(1, blocksize)) == NULL)
 247                         err(1, NULL);
 248         } else {
 249                 tmpp = curp;
 250                 curp = savp;
 251                 savp = tmpp;
 252                 address += blocksize;
 253                 valid_save = 1;
 254         }
 255         for (need = blocksize, nread = 0;;) {
 256                 /*
 257                  * if read the right number of bytes, or at EOF for one file,
 258                  * and no other files are available, zero-pad the rest of the
 259                  * block and set the end flag.
 260                  */
 261                 if (!length || (ateof && !next((char **)NULL))) {
 262                         if (odmode && address < skip)
 263                                 errx(1, "cannot skip past end of input");
 264                         if (need == blocksize)
 265                                 return((u_char *)NULL);
 266                         /*
 267                          * XXX bcmp() is not quite right in the presence
 268                          * of multibyte characters.
 269                          */
 270                         if (vflag != ALL &&
 271                             valid_save &&
 272                             bcmp(curp, savp, nread) == 0) {
 273                                 if (vflag != DUP)
 274                                         (void)printf("*\n");
 275                                 return((u_char *)NULL);
 276                         }
 277                         bzero((char *)curp + nread, need);
 278                         eaddress = address + nread;
 279                         return(curp);
 280                 }
 281                 n = fread((char *)curp + nread, sizeof(u_char),
 282                     length == -1 ? need : MIN(length, need), stdin);
 283                 if (!n) {
 284                         if (ferror(stdin))
 285                                 warn("%s", _argv[-1]);
 286                         ateof = 1;
 287                         continue;
 288                 }
 289                 ateof = 0;
 290                 if (length != -1)
 291                         length -= n;
 292                 if (!(need -= n)) {
 293                         /*
 294                          * XXX bcmp() is not quite right in the presence
 295                          * of multibyte characters.
 296                          */
 297                         if (vflag == ALL || vflag == FIRST ||
 298                             valid_save == 0 ||
 299                             bcmp(curp, savp, blocksize) != 0) {
 300                                 if (vflag == DUP || vflag == FIRST)
 301                                         vflag = WAIT;
 302                                 return(curp);
 303                         }
 304                         if (vflag == WAIT)
 305                                 (void)printf("*\n");
 306                         vflag = DUP;
 307                         address += blocksize;
 308                         need = blocksize;
 309                         nread = 0;
 310                 }
 311                 else
 312                         nread += n;
 313         }
 314 }
 315
 316 size_t
 317 peek(u_char *buf, size_t nbytes)
 318 {
 319         size_t n, nread;
 320         int c;
 321
 322         if (length != -1 && nbytes > (unsigned int)length)
 323                 nbytes = length;
 324         nread = 0;
 325         while (nread < nbytes && (c = getchar()) != EOF) {
 326                 *buf++ = c;
 327                 nread++;
 328         }
 329         n = nread;
 330         while (n-- > 0) {
 331                 c = *--buf;
 332                 ungetc(c, stdin);
 333         }
 334         return (nread);
 335 }
 336
 337 int
 338 next(char **argv)
 339 {
 340         static int done;
 341         int statok;
 342
 343         if (argv) {
 344                 _argv = argv;
 345                 return(1);
 346         }
 347         for (;;) {
 348                 if (*_argv) {
 349                         done = 1;
 350                         if (!(freopen(*_argv, "r", stdin))) {
 351                                 warn("%s", *_argv);
 352                                 exitval = 1;
 353                                 ++_argv;
 354                                 continue;
 355                         }
 356                         statok = 1;
 357                 } else {
 358                         if (done++)
 359                                 return(0);
 360                         statok = 0;
 361                 }
 362                 if (skip)
 363                         doskip(statok ? *_argv : "stdin", statok);
 364                 if (*_argv)
 365                         ++_argv;
 366                 if (!skip)
 367                         return(1);
 368         }
 369         /* NOTREACHED */
 370 }
 371
 372 void
 373 doskip(const char *fname, int statok)
 374 {
 375         int cnt;
 376         struct stat sb;
 377
 378         if (statok) {
 379                 if (fstat(fileno(stdin), &sb))
 380                         err(1, "%s", fname);
 381                 if (S_ISREG(sb.st_mode) && skip >= sb.st_size) {
 382                         address += sb.st_size;
 383                         skip -= sb.st_size;
 384                         return;
 385                 }
 386         }
 387         if (S_ISREG(sb.st_mode)) {
 388                 if (fseeko(stdin, skip, SEEK_SET))
 389                         err(1, "%s", fname);
 390                 address += skip;
 391                 skip = 0;
 392         } else {
 393                 for (cnt = 0; cnt < skip; ++cnt)
 394                         if (getchar() == EOF)
 395                                 break;
 396                 address += cnt;
 397                 skip -= cnt;
 398         }
 399 }