display.c revision 1.4
1 /* $NetBSD: display.c,v 1.4 1997/01/09 20:19:52 tls Exp $ */ 2 3 /* 4 * Copyright (c) 1989 The Regents of the University of California. 5 * 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 /*static char sccsid[] = "from: @(#)display.c 5.11 (Berkeley) 3/9/91";*/ 38 static char rcsid[] = "$NetBSD: display.c,v 1.4 1997/01/09 20:19:52 tls Exp $"; 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 #include <sys/stat.h> 43 #include <unistd.h> 44 #include <errno.h> 45 #include <ctype.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include "hexdump.h" 50 51 enum _vflag vflag = FIRST; 52 53 static off_t address; /* address/offset in stream */ 54 static off_t eaddress; /* end address */ 55 static off_t savaddress; /* saved address/offset in stream */ 56 57 #define PRINT { \ 58 switch(pr->flags) { \ 59 case F_ADDRESS: \ 60 (void)printf(pr->fmt, address); \ 61 break; \ 62 case F_BPAD: \ 63 (void)printf(pr->fmt, ""); \ 64 break; \ 65 case F_C: \ 66 conv_c(pr, bp); \ 67 break; \ 68 case F_CHAR: \ 69 (void)printf(pr->fmt, *bp); \ 70 break; \ 71 case F_DBL: { \ 72 double dval; \ 73 float fval; \ 74 switch(pr->bcnt) { \ 75 case 4: \ 76 bcopy((char *)bp, (char *)&fval, sizeof(fval)); \ 77 (void)printf(pr->fmt, fval); \ 78 break; \ 79 case 8: \ 80 bcopy((char *)bp, (char *)&dval, sizeof(dval)); \ 81 (void)printf(pr->fmt, dval); \ 82 break; \ 83 } \ 84 break; \ 85 } \ 86 case F_INT: { \ 87 int ival; \ 88 short sval; \ 89 switch(pr->bcnt) { \ 90 case 1: \ 91 (void)printf(pr->fmt, (int)*bp); \ 92 break; \ 93 case 2: \ 94 bcopy((char *)bp, (char *)&sval, sizeof(sval)); \ 95 (void)printf(pr->fmt, (int)sval); \ 96 break; \ 97 case 4: \ 98 bcopy((char *)bp, (char *)&ival, sizeof(ival)); \ 99 (void)printf(pr->fmt, ival); \ 100 break; \ 101 } \ 102 break; \ 103 } \ 104 case F_P: \ 105 (void)printf(pr->fmt, isprint(*bp) ? *bp : '.'); \ 106 break; \ 107 case F_STR: \ 108 (void)printf(pr->fmt, (char *)bp); \ 109 break; \ 110 case F_TEXT: \ 111 (void)printf(pr->fmt); \ 112 break; \ 113 case F_U: \ 114 conv_u(pr, bp); \ 115 break; \ 116 case F_UINT: { \ 117 u_int ival; \ 118 u_short sval; \ 119 switch(pr->bcnt) { \ 120 case 1: \ 121 (void)printf(pr->fmt, (u_int)*bp); \ 122 break; \ 123 case 2: \ 124 bcopy((char *)bp, (char *)&sval, sizeof(sval)); \ 125 (void)printf(pr->fmt, (u_int)sval); \ 126 break; \ 127 case 4: \ 128 bcopy((char *)bp, (char *)&ival, sizeof(ival)); \ 129 (void)printf(pr->fmt, ival); \ 130 break; \ 131 } \ 132 break; \ 133 } \ 134 } \ 135 } 136 137 display() 138 { 139 extern FU *endfu; 140 register FS *fs; 141 register FU *fu; 142 register PR *pr; 143 register int cnt; 144 register u_char *bp; 145 off_t saveaddress; 146 u_char savech, *savebp, *get(); 147 148 while (bp = get()) 149 for (fs = fshead, savebp = bp, saveaddress = address; fs; 150 fs = fs->nextfs, bp = savebp, address = saveaddress) 151 for (fu = fs->nextfu; fu; fu = fu->nextfu) { 152 if (fu->flags&F_IGNORE) 153 break; 154 for (cnt = fu->reps; cnt; --cnt) 155 for (pr = fu->nextpr; pr; address += pr->bcnt, 156 bp += pr->bcnt, pr = pr->nextpr) { 157 if (eaddress && address >= eaddress && 158 !(pr->flags&(F_TEXT|F_BPAD))) 159 bpad(pr); 160 if (cnt == 1 && pr->nospace) { 161 savech = *pr->nospace; 162 *pr->nospace = '\0'; 163 } 164 PRINT; 165 if (cnt == 1 && pr->nospace) 166 *pr->nospace = savech; 167 } 168 } 169 if (endfu) { 170 /* 171 * if eaddress not set, error or file size was multiple of 172 * blocksize, and no partial block ever found. 173 */ 174 if (!eaddress) { 175 if (!address) 176 return; 177 eaddress = address; 178 } 179 for (pr = endfu->nextpr; pr; pr = pr->nextpr) 180 switch(pr->flags) { 181 case F_ADDRESS: 182 (void)printf(pr->fmt, eaddress); 183 break; 184 case F_TEXT: 185 (void)printf(pr->fmt); 186 break; 187 } 188 } 189 } 190 191 bpad(pr) 192 PR *pr; 193 { 194 static char *spec = " -0+#"; 195 register char *p1, *p2; 196 197 /* 198 * remove all conversion flags; '-' is the only one valid 199 * with %s, and it's not useful here. 200 */ 201 pr->flags = F_BPAD; 202 *pr->cchar = 's'; 203 for (p1 = pr->fmt; *p1 != '%'; ++p1); 204 for (p2 = ++p1; *p1 && index(spec, *p1); ++p1); 205 while (*p2++ = *p1++); 206 } 207 208 static char **_argv; 209 210 u_char * 211 get() 212 { 213 extern enum _vflag vflag; 214 extern int length; 215 static int ateof = 1; 216 static u_char *curp, *savp; 217 register int n; 218 int need, nread; 219 u_char *tmpp; 220 221 if (!curp) { 222 curp = (u_char *)emalloc(blocksize); 223 savp = (u_char *)emalloc(blocksize); 224 } else { 225 tmpp = curp; 226 curp = savp; 227 savp = tmpp; 228 address = savaddress += blocksize; 229 } 230 for (need = blocksize, nread = 0;;) { 231 /* 232 * if read the right number of bytes, or at EOF for one file, 233 * and no other files are available, zero-pad the rest of the 234 * block and set the end flag. 235 */ 236 if (!length || ateof && !next((char **)NULL)) { 237 if (need == blocksize) 238 return((u_char *)NULL); 239 if (vflag != ALL && !bcmp(curp, savp, nread)) { 240 if (vflag != DUP) 241 (void)printf("*\n"); 242 return((u_char *)NULL); 243 } 244 bzero((char *)curp + nread, need); 245 eaddress = address + nread; 246 return(curp); 247 } 248 n = fread((char *)curp + nread, sizeof(u_char), 249 length == -1 ? need : MIN(length, need), stdin); 250 if (!n) { 251 if (ferror(stdin)) 252 (void)fprintf(stderr, "hexdump: %s: %s\n", 253 _argv[-1], strerror(errno)); 254 ateof = 1; 255 continue; 256 } 257 ateof = 0; 258 if (length != -1) 259 length -= n; 260 if (!(need -= n)) { 261 if (vflag == ALL || vflag == FIRST || 262 bcmp(curp, savp, blocksize)) { 263 if (vflag == DUP || vflag == FIRST) 264 vflag = WAIT; 265 return(curp); 266 } 267 if (vflag == WAIT) 268 (void)printf("*\n"); 269 vflag = DUP; 270 address = savaddress += blocksize; 271 need = blocksize; 272 nread = 0; 273 } 274 else 275 nread += n; 276 } 277 } 278 279 extern off_t skip; /* bytes to skip */ 280 281 next(argv) 282 char **argv; 283 { 284 extern int exitval; 285 static int done; 286 int statok; 287 288 if (argv) { 289 _argv = argv; 290 return(1); 291 } 292 for (;;) { 293 if (*_argv) { 294 if (!(freopen(*_argv, "r", stdin))) { 295 (void)fprintf(stderr, "hexdump: %s: %s\n", 296 *_argv, strerror(errno)); 297 exitval = 1; 298 ++_argv; 299 continue; 300 } 301 statok = done = 1; 302 } else { 303 if (done++) 304 return(0); 305 statok = 0; 306 } 307 if (skip) 308 doskip(statok ? *_argv : "stdin", statok); 309 if (*_argv) 310 ++_argv; 311 if (!skip) 312 return(1); 313 } 314 /* NOTREACHED */ 315 } 316 317 doskip(fname, statok) 318 char *fname; 319 int statok; 320 { 321 struct stat sbuf; 322 323 if (statok) { 324 if (fstat(fileno(stdin), &sbuf)) { 325 (void)fprintf(stderr, "hexdump: %s: %s.\n", 326 fname, strerror(errno)); 327 exit(1); 328 } 329 if (skip >= sbuf.st_size) { 330 skip -= sbuf.st_size; 331 address += sbuf.st_size; 332 return; 333 } 334 } 335 if (fseek(stdin, skip, SEEK_SET)) { 336 (void)fprintf(stderr, "hexdump: %s: %s.\n", 337 fname, strerror(errno)); 338 exit(1); 339 } 340 savaddress = address += skip; 341 skip = 0; 342 } 343 344 char * 345 emalloc(size) 346 int size; 347 { 348 char *p; 349 350 if (!(p = malloc((u_int)size))) 351 nomem(); 352 bzero(p, size); 353 return(p); 354 } 355 356 nomem() 357 { 358 (void)fprintf(stderr, "hexdump: %s.\n", strerror(errno)); 359 exit(1); 360 } 361
Indexes created Wed Sep 24 02:09:48 GMT 2025