commands/hexdump/display.c

   1 /*      $NetBSD: display.c,v 1.21 2009/01/18 21:34:32 apb Exp $ */
   2
   3 /*
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #if HAVE_NBTOOL_CONFIG_H
  33 #include "nbtool_config.h"
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37 #if 0
  38 #if !defined(lint)
  39 #if 0
  40 static char sccsid[] = "@(#)display.c   8.1 (Berkeley) 6/6/93";
  41 #else
  42 __RCSID("$NetBSD: display.c,v 1.21 2009/01/18 21:34:32 apb Exp $");
  43 #endif
  44 #endif /* not lint */
  45 #endif
  46
  47 #include <sys/param.h>
  48 #include <sys/stat.h>
  49
  50 #include <ctype.h>
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <inttypes.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58 #include <util.h>
  59
  60 #include "hexdump.h"
  61
  62 enum _vflag vflag = FIRST;
  63
  64 static off_t address;                   /* address/offset in stream */
  65 static off_t eaddress;                  /* end address */
  66
  67 static inline void print(PR *, u_char *);
  68
  69 void
  70 display(void)
  71 {
  72         FS *fs;
  73         FU *fu;
  74         PR *pr;
  75         int cnt;
  76         u_char *bp;
  77         off_t saveaddress;
  78         u_char savech, *savebp;
  79
  80         savech = 0;
  81         while ((bp = get()) != NULL)
  82             for (fs = fshead, savebp = bp, saveaddress = address; fs;
  83                 fs = fs->nextfs, bp = savebp, address = saveaddress)
  84                     for (fu = fs->nextfu; fu; fu = fu->nextfu) {
  85                         if (fu->flags&F_IGNORE)
  86                                 break;
  87                         for (cnt = fu->reps; cnt; --cnt)
  88                             for (pr = fu->nextpr; pr; address += pr->bcnt,
  89                                 bp += pr->bcnt, pr = pr->nextpr) {
  90                                     if (eaddress && address >= eaddress &&
  91                                         !(pr->flags & (F_TEXT|F_BPAD)))
  92                                             bpad(pr);
  93                                     if (cnt == 1 && pr->nospace) {
  94                                         savech = *pr->nospace;
  95                                         *pr->nospace = '\0';
  96                                     }
  97                                     print(pr, bp);
  98                                     if (cnt == 1 && pr->nospace)
  99                                         *pr->nospace = savech;
 100                             }
 101                     }
 102         if (endfu) {
 103                 /*
 104                  * If eaddress not set, error or file size was multiple of
 105                  * blocksize, and no partial block ever found.
 106                  */
 107                 if (!eaddress) {
 108                         if (!address)
 109                                 return;
 110                         eaddress = address;
 111                 }
 112                 for (pr = endfu->nextpr; pr; pr = pr->nextpr)
 113                         switch(pr->flags) {
 114                         case F_ADDRESS:
 115                                 (void)printf(pr->fmt, (int64_t)eaddress);
 116                                 break;
 117                         case F_TEXT:
 118                                 (void)printf("%s", pr->fmt);
 119                                 break;
 120                         }
 121         }
 122 }
 123
 124 static inline void
 125 print(PR *pr, u_char *bp)
 126 {
 127            double f8;
 128             float f4;
 129           int16_t s2;
 130           int32_t s4;
 131           int64_t s8;
 132          uint16_t u2;
 133          uint32_t u4;
 134          uint64_t u8;
 135
 136         switch(pr->flags) {
 137         case F_ADDRESS:
 138                 (void)printf(pr->fmt, (int64_t)address);
 139                 break;
 140         case F_BPAD:
 141                 (void)printf(pr->fmt, "");
 142                 break;
 143         case F_C:
 144                 conv_c(pr, bp);
 145                 break;
 146         case F_CHAR:
 147                 (void)printf(pr->fmt, *bp);
 148                 break;
 149         case F_DBL:
 150                 switch(pr->bcnt) {
 151                 case 4:
 152                         memmove(&f4, bp, sizeof(f4));
 153                         (void)printf(pr->fmt, f4);
 154                         break;
 155                 case 8:
 156                         memmove(&f8, bp, sizeof(f8));
 157                         (void)printf(pr->fmt, f8);
 158                         break;
 159                 }
 160                 break;
 161         case F_INT:
 162                 switch(pr->bcnt) {
 163                 case 1:
 164                         (void)printf(pr->fmt, (int64_t)*bp);
 165                         break;
 166                 case 2:
 167                         memmove(&s2, bp, sizeof(s2));
 168                         (void)printf(pr->fmt, (int64_t)s2);
 169                         break;
 170                 case 4:
 171                         memmove(&s4, bp, sizeof(s4));
 172                         (void)printf(pr->fmt, (int64_t)s4);
 173                         break;
 174                 case 8:
 175                         memmove(&s8, bp, sizeof(s8));
 176                         (void)printf(pr->fmt, (int64_t)s8);
 177                         break;
 178                 }
 179                 break;
 180         case F_P:
 181                 (void)printf(pr->fmt, isprint(*bp) ? *bp : '.');
 182                 break;
 183         case F_STR:
 184                 (void)printf(pr->fmt, (char *)bp);
 185                 break;
 186         case F_TEXT:
 187                 (void)printf("%s", pr->fmt);
 188                 break;
 189         case F_U:
 190                 conv_u(pr, bp);
 191                 break;
 192         case F_UINT:
 193                 switch(pr->bcnt) {
 194                 case 1:
 195                         (void)printf(pr->fmt, (uint64_t)*bp);
 196                         break;
 197                 case 2:
 198                         memmove(&u2, bp, sizeof(u2));
 199                         (void)printf(pr->fmt, (uint64_t)u2);
 200                         break;
 201                 case 4:
 202                         memmove(&u4, bp, sizeof(u4));
 203                         (void)printf(pr->fmt, (uint64_t)u4);
 204                         break;
 205                 case 8:
 206                         memmove(&u8, bp, sizeof(u8));
 207                         (void)printf(pr->fmt, (uint64_t)u8);
 208                         break;
 209                 }
 210                 break;
 211         }
 212 }
 213
 214 void
 215 bpad(PR *pr)
 216 {
 217         static const char *spec = " -0+#";
 218         char *p1, *p2;
 219
 220         /*
 221          * Remove all conversion flags; '-' is the only one valid
 222          * with %s, and it's not useful here.
 223          */
 224         pr->flags = F_BPAD;
 225         pr->cchar[0] = 's';
 226         pr->cchar[1] = '\0';
 227         for (p1 = pr->fmt; *p1 != '%'; ++p1);
 228         for (p2 = ++p1; *p1 && strchr(spec, *p1); ++p1);
 229         while ((*p2++ = *p1++) != '\0');
 230 }
 231
 232 static char **_argv;
 233
 234 u_char *
 235 get(void)
 236 {
 237         static int ateof = 1;
 238         static u_char *curp, *savp;
 239         int n;
 240         int need, nread;
 241         u_char *tmpp;
 242
 243         if (!curp) {
 244                 curp = ecalloc(blocksize, 1);
 245                 savp = ecalloc(blocksize, 1);
 246         } else {
 247                 tmpp = curp;
 248                 curp = savp;
 249                 savp = tmpp;
 250                 address += blocksize;
 251         }
 252         for (need = blocksize, nread = 0;;) {
 253                 /*
 254                  * if read the right number of bytes, or at EOF for one file,
 255                  * and no other files are available, zero-pad the rest of the
 256                  * block and set the end flag.
 257                  */
 258                 if (!length || (ateof && !next(NULL))) {
 259                         if (need == blocksize)
 260                                 return(NULL);
 261                         if (!need && vflag != ALL &&
 262                             !memcmp(curp, savp, nread)) {
 263                                 if (vflag != DUP)
 264                                         (void)printf("*\n");
 265                                 return(NULL);
 266                         }
 267                         memset((char *)curp + nread, 0, need);
 268                         eaddress = address + nread;
 269                         return(curp);
 270                 }
 271                 n = fread((char *)curp + nread, sizeof(u_char),
 272                     length == -1 ? need : MIN(length, need), stdin);
 273                 if (!n) {
 274                         if (ferror(stdin))
 275                                 warn("%s", _argv[-1]);
 276                         ateof = 1;
 277                         continue;
 278                 }
 279                 ateof = 0;
 280                 if (length != -1)
 281                         length -= n;
 282                 if (!(need -= n)) {
 283                         if (vflag == ALL || vflag == FIRST ||
 284                             memcmp(curp, savp, blocksize)) {
 285                                 if (vflag == DUP || vflag == FIRST)
 286                                         vflag = WAIT;
 287                                 return(curp);
 288                         }
 289                         if (vflag == WAIT)
 290                                 (void)printf("*\n");
 291                         vflag = DUP;
 292                         address += blocksize;
 293                         need = blocksize;
 294                         nread = 0;
 295                 }
 296                 else
 297                         nread += n;
 298         }
 299 }
 300
 301 int
 302 next(char **argv)
 303 {
 304         static int done;
 305         int statok;
 306
 307         if (argv) {
 308                 _argv = argv;
 309                 return(1);
 310         }
 311         for (;;) {
 312                 if (*_argv) {
 313                         if (!(freopen(*_argv, "r", stdin))) {
 314                                 warn("%s", *_argv);
 315                                 exitval = 1;
 316                                 ++_argv;
 317                                 continue;
 318                         }
 319                         statok = done = 1;
 320                 } else {
 321                         if (done++)
 322                                 return(0);
 323                         statok = 0;
 324                 }
 325                 if (skip)
 326                         doskip(statok ? *_argv : "stdin", statok);
 327                 if (*_argv)
 328                         ++_argv;
 329                 if (!skip)
 330                         return(1);
 331         }
 332         /* NOTREACHED */
 333 }
 334
 335 void
 336 doskip(const char *fname, int statok)
 337 {
 338         int cnt;
 339         struct stat sb;
 340
 341         if (statok) {
 342                 if (fstat(fileno(stdin), &sb))
 343                         err(1, "fstat %s", fname);
 344                 if (S_ISREG(sb.st_mode) && skip >= sb.st_size) {
 345                         address += sb.st_size;
 346                         skip -= sb.st_size;
 347                         return;
 348                 }
 349         }
 350         if (S_ISREG(sb.st_mode)) {
 351                 if (fseek(stdin, skip, SEEK_SET))
 352                         err(1, "fseek %s", fname);
 353                 address += skip;
 354                 skip = 0;
 355         } else {
 356                 for (cnt = 0; cnt < skip; ++cnt)
 357                         if (getchar() == EOF)
 358                                 break;
 359                 address += cnt;
 360                 skip -= cnt;
 361         }
 362 }