1 /* $OpenBSD: display.c,v 1.25 2016/08/24 03:13:45 guenther Exp $ */ 2 /* $NetBSD: display.c,v 1.12 2001/12/07 15:14:29 bjh21 Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/stat.h> 34 35 #include <ctype.h> 36 #include <err.h> 37 #include <errno.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #include "hexdump.h" 44 45 #define MINIMUM(a, b) (((a) < (b)) ? (a) : (b)) 46 47 enum _vflag vflag = FIRST; 48 49 static off_t address; /* address/offset in stream */ 50 static off_t eaddress; /* end address */ 51 52 static void bpad(PR *); 53 static void doskip(const char *, int); 54 static u_char *get(void); 55 static __inline void print(PR *, u_char *); 56 57 void 58 display(void) 59 { 60 FS *fs; 61 FU *fu; 62 PR *pr; 63 int cnt; 64 u_char *bp; 65 off_t saveaddress; 66 u_char savech, *savebp; 67 68 savech = 0; 69 while ((bp = get()) != NULL) 70 for (fs = fshead, savebp = bp, saveaddress = address; fs; 71 fs = fs->nextfs, bp = savebp, address = saveaddress) 72 for (fu = fs->nextfu; fu; fu = fu->nextfu) { 73 if (fu->flags&F_IGNORE) 74 break; 75 for (cnt = fu->reps; cnt; --cnt) 76 for (pr = fu->nextpr; pr; address += pr->bcnt, 77 bp += pr->bcnt, pr = pr->nextpr) { 78 if (eaddress && address >= eaddress && 79 !(pr->flags & (F_TEXT|F_BPAD))) 80 bpad(pr); 81 if (cnt == 1 && pr->nospace) { 82 savech = *pr->nospace; 83 *pr->nospace = '\0'; 84 } 85 print(pr, bp); 86 if (cnt == 1 && pr->nospace) 87 *pr->nospace = savech; 88 } 89 } 90 if (endfu) { 91 /* 92 * If eaddress not set, error or file size was multiple of 93 * blocksize, and no partial block ever found. 94 */ 95 if (!eaddress) { 96 if (!address) 97 return; 98 eaddress = address; 99 } 100 for (pr = endfu->nextpr; pr; pr = pr->nextpr) 101 switch(pr->flags) { 102 case F_ADDRESS: 103 (void)printf(pr->fmt, (int64_t)eaddress); 104 break; 105 case F_TEXT: 106 (void)printf("%s", pr->fmt); 107 break; 108 } 109 } 110 } 111 112 static __inline void 113 print(PR *pr, u_char *bp) 114 { 115 double f8; 116 float f4; 117 int16_t s2; 118 int32_t s4; 119 int64_t s8; 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, (int64_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 memmove(&f4, bp, sizeof(f4)); 141 (void)printf(pr->fmt, f4); 142 break; 143 case 8: 144 memmove(&f8, bp, sizeof(f8)); 145 (void)printf(pr->fmt, f8); 146 break; 147 } 148 break; 149 case F_INT: 150 switch(pr->bcnt) { 151 case 1: 152 (void)printf(pr->fmt, (int64_t)*bp); 153 break; 154 case 2: 155 memmove(&s2, bp, sizeof(s2)); 156 (void)printf(pr->fmt, (int64_t)s2); 157 break; 158 case 4: 159 memmove(&s4, bp, sizeof(s4)); 160 (void)printf(pr->fmt, (int64_t)s4); 161 break; 162 case 8: 163 memmove(&s8, bp, sizeof(s8)); 164 (void)printf(pr->fmt, s8); 165 break; 166 } 167 break; 168 case F_P: 169 (void)printf(pr->fmt, isprint(*bp) ? *bp : '.'); 170 break; 171 case F_STR: 172 (void)printf(pr->fmt, (char *)bp); 173 break; 174 case F_TEXT: 175 (void)printf("%s", pr->fmt); 176 break; 177 case F_U: 178 conv_u(pr, bp); 179 break; 180 case F_UINT: 181 switch(pr->bcnt) { 182 case 1: 183 (void)printf(pr->fmt, (uint64_t)*bp); 184 break; 185 case 2: 186 memmove(&u2, bp, sizeof(u2)); 187 (void)printf(pr->fmt, (uint64_t)u2); 188 break; 189 case 4: 190 memmove(&u4, bp, sizeof(u4)); 191 (void)printf(pr->fmt, (uint64_t)u4); 192 break; 193 case 8: 194 memmove(&u8, bp, sizeof(u8)); 195 (void)printf(pr->fmt, u8); 196 break; 197 } 198 break; 199 } 200 } 201 202 static void 203 bpad(PR *pr) 204 { 205 static const char *spec = " -0+#"; 206 char *p1, *p2; 207 208 /* 209 * Remove all conversion flags; '-' is the only one valid 210 * with %s, and it's not useful here. 211 */ 212 pr->flags = F_BPAD; 213 pr->cchar[0] = 's'; 214 pr->cchar[1] = '\0'; 215 for (p1 = pr->fmt; *p1 != '%'; ++p1); 216 for (p2 = ++p1; *p1 && strchr(spec, *p1); ++p1); 217 while ((*p2++ = *p1++) != '\0'); 218 } 219 220 static char **_argv; 221 222 static u_char * 223 get(void) 224 { 225 static int ateof = 1; 226 static u_char *curp, *savp; 227 int n; 228 int need, nread; 229 u_char *tmpp; 230 231 if (!curp) { 232 if ((curp = calloc(1, blocksize)) == NULL || 233 (savp = calloc(1, blocksize)) == NULL) 234 err(1, NULL); 235 } else { 236 tmpp = curp; 237 curp = savp; 238 savp = tmpp; 239 address += blocksize; 240 } 241 for (need = blocksize, nread = 0;;) { 242 /* 243 * if read the right number of bytes, or at EOF for one file, 244 * and no other files are available, zero-pad the rest of the 245 * block and set the end flag. 246 */ 247 if (!length || (ateof && !next(NULL))) { 248 if (need == blocksize) 249 return(NULL); 250 if (!need && vflag != ALL && 251 !memcmp(curp, savp, nread)) { 252 if (vflag != DUP) 253 (void)printf("*\n"); 254 return(NULL); 255 } 256 memset((char *)curp + nread, 0, need); 257 eaddress = address + nread; 258 return(curp); 259 } 260 n = fread((char *)curp + nread, sizeof(u_char), 261 length == -1 ? need : MINIMUM(length, need), stdin); 262 if (!n) { 263 if (ferror(stdin)) 264 warn("%s", _argv[-1]); 265 ateof = 1; 266 continue; 267 } 268 ateof = 0; 269 if (length != -1) 270 length -= n; 271 if (!(need -= n)) { 272 if (vflag == ALL || vflag == FIRST || 273 memcmp(curp, savp, blocksize)) { 274 if (vflag == DUP || vflag == FIRST) 275 vflag = WAIT; 276 return(curp); 277 } 278 if (vflag == WAIT) 279 (void)printf("*\n"); 280 vflag = DUP; 281 address += blocksize; 282 need = blocksize; 283 nread = 0; 284 } 285 else 286 nread += n; 287 } 288 } 289 290 int 291 next(char **argv) 292 { 293 static int done; 294 int statok; 295 296 if (argv) { 297 _argv = argv; 298 return(1); 299 } 300 for (;;) { 301 if (*_argv) { 302 if (!(freopen(*_argv, "r", stdin))) { 303 warn("%s", *_argv); 304 exitval = done = 1; 305 ++_argv; 306 continue; 307 } 308 statok = done = 1; 309 } else { 310 if (done++) 311 return(0); 312 statok = 0; 313 } 314 if (iobuf != NULL) 315 setvbuf(stdin, iobuf, _IOFBF, iobufsiz); 316 if (skip) 317 doskip(statok ? *_argv : "stdin", statok); 318 if (*_argv) 319 ++_argv; 320 if (!skip) 321 return(1); 322 } 323 /* NOTREACHED */ 324 } 325 326 static void 327 doskip(const char *fname, int statok) 328 { 329 off_t cnt; 330 struct stat sb; 331 332 if (statok) { 333 if (fstat(fileno(stdin), &sb)) 334 err(1, "fstat %s", fname); 335 if (S_ISREG(sb.st_mode)) { 336 if (skip > sb.st_size) { 337 address += sb.st_size; 338 skip -= sb.st_size; 339 } else { 340 if (fseeko(stdin, skip, SEEK_SET)) 341 err(1, "fseeko %s", fname); 342 address += skip; 343 skip = 0; 344 } 345 return; 346 } 347 } 348 349 for (cnt = 0; cnt < skip; ++cnt) 350 if (getchar() == EOF) 351 break; 352 address += cnt; 353 skip -= cnt; 354 } 355