text-utils/display.c

   1 /*
   2  * Copyright (c) 1989 The Regents of the University of California.
   3  * 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 #include <sys/param.h>
  35 #include <sys/stat.h>
  36 #include <unistd.h>
  37 #include <errno.h>
  38 #include <ctype.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include "hexdump.h"
  43 #include "xalloc.h"
  44 #include "c.h"
  45 #include "nls.h"
  46
  47 static void doskip(const char *, int);
  48 static u_char *get(void);
  49
  50 enum _vflag vflag = FIRST;
  51
  52 static off_t address;                   /* address/offset in stream */
  53 static off_t eaddress;                  /* end address */
  54
  55 static inline void
  56 print(PR *pr, unsigned char *bp) {
  57
  58         switch(pr->flags) {
  59         case F_ADDRESS:
  60                 (void)printf(pr->fmt, (int64_t)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             {
  73                 double dval;
  74                 float fval;
  75                 switch(pr->bcnt) {
  76                 case 4:
  77                         memmove(&fval, bp, sizeof(fval));
  78                         (void)printf(pr->fmt, fval);
  79                         break;
  80                 case 8:
  81                         memmove(&dval, bp, sizeof(dval));
  82                         (void)printf(pr->fmt, dval);
  83                         break;
  84                 }
  85                 break;
  86             }
  87         case F_INT:
  88             {
  89                 short sval;     /* int16_t */
  90                 int ival;       /* int32_t */
  91                 long long Lval; /* int64_t, int64_t */
  92
  93                 switch(pr->bcnt) {
  94                 case 1:
  95                         (void)printf(pr->fmt, (int64_t)*bp);
  96                         break;
  97                 case 2:
  98                         memmove(&sval, bp, sizeof(sval));
  99                         (void)printf(pr->fmt, (int64_t)sval);
 100                         break;
 101                 case 4:
 102                         memmove(&ival, bp, sizeof(ival));
 103                         (void)printf(pr->fmt, (int64_t)ival);
 104                         break;
 105                 case 8:
 106                         memmove(&Lval, bp, sizeof(Lval));
 107                         (void)printf(pr->fmt, (int64_t)Lval);
 108                         break;
 109                 }
 110                 break;
 111             }
 112         case F_P:
 113                 (void)printf(pr->fmt, isprint(*bp) ? *bp : '.');
 114                 break;
 115         case F_STR:
 116                 (void)printf(pr->fmt, (char *)bp);
 117                 break;
 118         case F_TEXT:
 119                 (void)printf("%s", pr->fmt);
 120                 break;
 121         case F_U:
 122                 conv_u(pr, bp);
 123                 break;
 124         case F_UINT:
 125             {
 126                 unsigned short sval;    /* u_int16_t */
 127                 unsigned int ival;      /* u_int32_t */
 128                 unsigned long long Lval;/* u_int64_t, u_int64_t */
 129
 130                 switch(pr->bcnt) {
 131                 case 1:
 132                         (void)printf(pr->fmt, (uint64_t)*bp);
 133                         break;
 134                 case 2:
 135                         memmove(&sval, bp, sizeof(sval));
 136                         (void)printf(pr->fmt, (uint64_t)sval);
 137                         break;
 138                 case 4:
 139                         memmove(&ival, bp, sizeof(ival));
 140                         (void)printf(pr->fmt, (uint64_t)ival);
 141                         break;
 142                 case 8:
 143                         memmove(&Lval, bp, sizeof(Lval));
 144                         (void)printf(pr->fmt, (uint64_t)Lval);
 145                         break;
 146                 }
 147                 break;
 148             }
 149         }
 150 }
 151
 152 static void bpad(PR *pr)
 153 {
 154         static const char *spec = " -0+#";
 155         char *p1, *p2;
 156
 157         /*
 158          * remove all conversion flags; '-' is the only one valid
 159          * with %s, and it's not useful here.
 160          */
 161         pr->flags = F_BPAD;
 162         pr->cchar[0] = 's';
 163         pr->cchar[1] = 0;
 164         for (p1 = pr->fmt; *p1 != '%'; ++p1);
 165         for (p2 = ++p1; *p1 && strchr(spec, *p1); ++p1);
 166         while ((*p2++ = *p1++) != 0) ;
 167 }
 168
 169 void display(void)
 170 {
 171         register FS *fs;
 172         register FU *fu;
 173         register PR *pr;
 174         register int cnt;
 175         register unsigned char *bp;
 176         off_t saveaddress;
 177         unsigned char savech = 0, *savebp;
 178
 179         while ((bp = get()) != NULL)
 180             for (fs = fshead, savebp = bp, saveaddress = address; fs;
 181                 fs = fs->nextfs, bp = savebp, address = saveaddress)
 182                     for (fu = fs->nextfu; fu; fu = fu->nextfu) {
 183                         if (fu->flags&F_IGNORE)
 184                                 break;
 185                         for (cnt = fu->reps; cnt; --cnt)
 186                             for (pr = fu->nextpr; pr; address += pr->bcnt,
 187                                 bp += pr->bcnt, pr = pr->nextpr) {
 188                                     if (eaddress && address >= eaddress &&
 189                                         !(pr->flags&(F_TEXT|F_BPAD)))
 190                                             bpad(pr);
 191                                     if (cnt == 1 && pr->nospace) {
 192                                         savech = *pr->nospace;
 193                                         *pr->nospace = '\0';
 194                                     }
 195                                     print(pr, bp);
 196                                     if (cnt == 1 && pr->nospace)
 197                                         *pr->nospace = savech;
 198                             }
 199                     }
 200         if (endfu) {
 201                 /*
 202                  * if eaddress not set, error or file size was multiple of
 203                  * blocksize, and no partial block ever found.
 204                  */
 205                 if (!eaddress) {
 206                         if (!address)
 207                                 return;
 208                         eaddress = address;
 209                 }
 210                 for (pr = endfu->nextpr; pr; pr = pr->nextpr)
 211                         switch(pr->flags) {
 212                         case F_ADDRESS:
 213                                 (void)printf(pr->fmt, (int64_t)eaddress);
 214                                 break;
 215                         case F_TEXT:
 216                                 (void)printf("%s", pr->fmt);
 217                                 break;
 218                         }
 219         }
 220 }
 221
 222 static char **_argv;
 223
 224 static u_char *
 225 get(void)
 226 {
 227         static int ateof = 1;
 228         static u_char *curp, *savp;
 229         ssize_t n, need, nread;
 230         u_char *tmpp;
 231
 232         if (!curp) {
 233                 curp = xcalloc(1, blocksize);
 234                 savp = xcalloc(1, blocksize);
 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                         if (need > 0)
 257                                 memset((char *)curp + nread, 0, need);
 258                         eaddress = address + nread;
 259                         return(curp);
 260                 }
 261                 if (fileno(stdin) == -1) {
 262                         warnx(_("all input file arguments failed"));
 263                         return(NULL);
 264                 }
 265                 n = fread((char *)curp + nread, sizeof(unsigned char),
 266                     length == -1 ? need : min(length, need), stdin);
 267                 if (!n) {
 268                         if (ferror(stdin))
 269                                 warn("%s", _argv[-1]);
 270                         ateof = 1;
 271                         continue;
 272                 }
 273                 ateof = 0;
 274                 if (length != -1)
 275                         length -= n;
 276                 if (!(need -= n)) {
 277                         if (vflag == ALL || vflag == FIRST ||
 278                             memcmp(curp, savp, blocksize)) {
 279                                 if (vflag == DUP || vflag == FIRST)
 280                                         vflag = WAIT;
 281                                 return(curp);
 282                         }
 283                         if (vflag == WAIT)
 284                                 (void)printf("*\n");
 285                         vflag = DUP;
 286                         address += blocksize;
 287                         need = blocksize;
 288                         nread = 0;
 289                 }
 290                 else
 291                         nread += n;
 292         }
 293 }
 294
 295 int next(char **argv)
 296 {
 297         static int done;
 298         int statok;
 299
 300         if (argv) {
 301                 _argv = argv;
 302                 return(1);
 303         }
 304         for (;;) {
 305                 if (*_argv) {
 306                         if (!(freopen(*_argv, "r", stdin))) {
 307                                 warn("%s", *_argv);
 308                                 exitval = EXIT_FAILURE;
 309                                 ++_argv;
 310                                 continue;
 311                         }
 312                         statok = done = 1;
 313                 } else {
 314                         if (done++)
 315                                 return(0);
 316                         statok = 0;
 317                 }
 318                 if (skip)
 319                         doskip(statok ? *_argv : "stdin", statok);
 320                 if (*_argv)
 321                         ++_argv;
 322                 if (!skip)
 323                         return(1);
 324         }
 325         /* NOTREACHED */
 326 }
 327
 328 static void
 329 doskip(const char *fname, int statok)
 330 {
 331         struct stat sbuf;
 332
 333         if (statok) {
 334                 if (fstat(fileno(stdin), &sbuf))
 335                         err(EXIT_FAILURE, "%s", fname);
 336                 if (S_ISREG(sbuf.st_mode) && skip > sbuf.st_size) {
 337                   /* If size valid and skip >= size */
 338                         skip -= sbuf.st_size;
 339                         address += sbuf.st_size;
 340                         return;
 341                 }
 342         }
 343         /* sbuf may be undefined here - do not test it */
 344         if (fseek(stdin, skip, SEEK_SET))
 345                 err(EXIT_FAILURE, "%s", fname);
 346         address += skip;
 347         skip = 0;
 348 }