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 1.6 2005/04/10 20:55:38 drhodus 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 static __inline void 57 print(PR *pr, u_char *bp) 58 { 59 long double ldbl; 60 double f8; 61 float f4; 62 int16_t s2; 63 int8_t s8; 64 int32_t s4; 65 u_int16_t u2; 66 u_int32_t u4; 67 u_int64_t u8; 68 69 switch(pr->flags) { 70 case F_ADDRESS: 71 (void)printf(pr->fmt, (quad_t)address); 72 break; 73 case F_BPAD: 74 (void)printf(pr->fmt, ""); 75 break; 76 case F_C: 77 conv_c(pr, bp); 78 break; 79 case F_CHAR: 80 (void)printf(pr->fmt, *bp); 81 break; 82 case F_DBL: 83 switch(pr->bcnt) { 84 case 4: 85 bcopy(bp, &f4, sizeof(f4)); 86 (void)printf(pr->fmt, f4); 87 break; 88 case 8: 89 bcopy(bp, &f8, sizeof(f8)); 90 (void)printf(pr->fmt, f8); 91 break; 92 default: 93 if (pr->bcnt == sizeof(long double)) { 94 bcopy(bp, &ldbl, sizeof(ldbl)); 95 (void)printf(pr->fmt, ldbl); 96 } 97 break; 98 } 99 break; 100 case F_INT: 101 switch(pr->bcnt) { 102 case 1: 103 (void)printf(pr->fmt, (quad_t)(signed char)*bp); 104 break; 105 case 2: 106 bcopy(bp, &s2, sizeof(s2)); 107 (void)printf(pr->fmt, (quad_t)s2); 108 break; 109 case 4: 110 bcopy(bp, &s4, sizeof(s4)); 111 (void)printf(pr->fmt, (quad_t)s4); 112 break; 113 case 8: 114 bcopy(bp, &s8, sizeof(s8)); 115 (void)printf(pr->fmt, s8); 116 break; 117 } 118 break; 119 case F_P: 120 (void)printf(pr->fmt, isprint(*bp) ? *bp : '.'); 121 break; 122 case F_STR: 123 (void)printf(pr->fmt, (char *)bp); 124 break; 125 case F_TEXT: 126 (void)printf("%s", pr->fmt); 127 break; 128 case F_U: 129 conv_u(pr, bp); 130 break; 131 case F_UINT: 132 switch(pr->bcnt) { 133 case 1: 134 (void)printf(pr->fmt, (u_quad_t)*bp); 135 break; 136 case 2: 137 bcopy(bp, &u2, sizeof(u2)); 138 (void)printf(pr->fmt, (u_quad_t)u2); 139 break; 140 case 4: 141 bcopy(bp, &u4, sizeof(u4)); 142 (void)printf(pr->fmt, (u_quad_t)u4); 143 break; 144 case 8: 145 bcopy(bp, &u8, sizeof(u8)); 146 (void)printf(pr->fmt, u8); 147 break; 148 } 149 break; 150 } 151 } 152 153 void 154 display(void) 155 { 156 157 FS *fs; 158 FU *fu; 159 PR *pr; 160 int cnt; 161 u_char *bp; 162 off_t saveaddress; 163 u_char savech = '\0', *savebp; 164 165 while ((bp = get())) 166 for (fs = fshead, savebp = bp, saveaddress = address; fs; 167 fs = fs->nextfs, bp = savebp, address = saveaddress) 168 for (fu = fs->nextfu; fu; fu = fu->nextfu) { 169 if (fu->flags&F_IGNORE) 170 break; 171 for (cnt = fu->reps; cnt; --cnt) 172 for (pr = fu->nextpr; pr; address += pr->bcnt, 173 bp += pr->bcnt, pr = pr->nextpr) { 174 if (eaddress && address >= eaddress && 175 !(pr->flags & (F_TEXT|F_BPAD))) 176 bpad(pr); 177 if (cnt == 1 && pr->nospace) { 178 savech = *pr->nospace; 179 *pr->nospace = '\0'; 180 } 181 print(pr, bp); 182 if (cnt == 1 && pr->nospace) 183 *pr->nospace = savech; 184 } 185 } 186 if (endfu) { 187 /* 188 * If eaddress not set, error or file size was multiple of 189 * blocksize, and no partial block ever found. 190 */ 191 if (!eaddress) { 192 if (!address) 193 return; 194 eaddress = address; 195 } 196 for (pr = endfu->nextpr; pr; pr = pr->nextpr) 197 switch(pr->flags) { 198 case F_ADDRESS: 199 (void)printf(pr->fmt, (quad_t)eaddress); 200 break; 201 case F_TEXT: 202 (void)printf("%s", pr->fmt); 203 break; 204 } 205 } 206 } 207 208 void 209 bpad(PR *pr) 210 { 211 static char const *spec = " -0+#"; 212 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 && strchr(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 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(NULL))) { 257 if (odmode && address < skip) 258 errx(1, "cannot skip past end of input"); 259 if (need == blocksize) 260 return(NULL); 261 if (vflag != ALL && 262 valid_save && 263 bcmp(curp, savp, nread) == 0) { 264 if (vflag != DUP) 265 (void)printf("*\n"); 266 return(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 static int done; 307 308 if (argv) { 309 _argv = argv; 310 return(1); 311 } 312 for (;;) { 313 if (*_argv) { 314 if (!(freopen(*_argv, "r", stdin))) { 315 warn("%s", *_argv); 316 exitval = 1; 317 ++_argv; 318 continue; 319 } 320 done = 1; 321 } else { 322 if (done++) 323 return(0); 324 } 325 if (skip) 326 doskip(*_argv ? *_argv : "stdin"); 327 if (*_argv) 328 ++_argv; 329 if (!skip) 330 return(1); 331 } 332 /* NOTREACHED */ 333 } 334 335 void 336 doskip(const char *fname) 337 { 338 int cnt; 339 struct stat sb; 340 341 if (fstat(fileno(stdin), &sb)) 342 err(1, "%s", fname); 343 if (S_ISREG(sb.st_mode) && skip >= sb.st_size) { 344 address += sb.st_size; 345 skip -= sb.st_size; 346 } else if (S_ISREG(sb.st_mode)) { 347 if (fseeko(stdin, skip, SEEK_SET)) 348 err(1, "%s", fname); 349 address += skip; 350 skip = 0; 351 } else { 352 for (cnt = 0; cnt < skip; ++cnt) 353 if (getchar() == EOF) 354 break; 355 address += cnt; 356 skip -= cnt; 357 } 358 } 359