usr/src/cmd/sed/main.c

   1 /*
   2  * Copyright 2020 OmniOS Community Edition (OmniOSce) Association.
   3  * Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.com>
   4  * Copyright (c) 2011 Gary Mills
   5  * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
   6  * Copyright (c) 1992 Diomidis Spinellis.
   7  * Copyright (c) 1992, 1993
   8  *      The Regents of the University of California.  All rights reserved.
   9  *
  10  * This code is derived from software contributed to Berkeley by
  11  * Diomidis Spinellis of Imperial College, University of London.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37
  38 #include <sys/types.h>
  39 #include <sys/mman.h>
  40 #include <sys/param.h>
  41 #include <sys/stat.h>
  42
  43 #include <err.h>
  44 #include <errno.h>
  45 #include <fcntl.h>
  46 #include <getopt.h>
  47 #include <libgen.h>
  48 #include <libintl.h>
  49 #include <limits.h>
  50 #include <locale.h>
  51 #include <regex.h>
  52 #include <stddef.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <unistd.h>
  57
  58 #include "defs.h"
  59 #include "extern.h"
  60
  61 /*
  62  * Linked list of units (strings and files) to be compiled
  63  */
  64 struct s_compunit {
  65         struct s_compunit *next;
  66         enum e_cut {CU_FILE, CU_STRING} type;
  67         char *s;                        /* Pointer to string or fname */
  68 };
  69
  70 /*
  71  * Linked list pointer to compilation units and pointer to current
  72  * next pointer.
  73  */
  74 static struct s_compunit *script, **cu_nextp = &script;
  75
  76 /*
  77  * Linked list of files to be processed
  78  */
  79 struct s_flist {
  80         char *fname;
  81         struct s_flist *next;
  82 };
  83
  84 /*
  85  * Linked list pointer to files and pointer to current
  86  * next pointer.
  87  */
  88 static struct s_flist *files, **fl_nextp = &files;
  89
  90 FILE *infile;                   /* Current input file */
  91 FILE *outfile;                  /* Current output file */
  92
  93 int aflag, eflag, nflag;
  94 int rflags = 0;
  95 static int rval;                /* Exit status */
  96
  97 static int ispan;               /* Whether inplace editing spans across files */
  98
  99 /*
 100  * Current file and line number; line numbers restart across compilation
 101  * units, but span across input files.  The latter is optional if editing
 102  * in place.
 103  */
 104 const char *fname;              /* File name. */
 105 const char *outfname;           /* Output file name */
 106 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
 107 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
 108 static const char *inplace;     /* Inplace edit file extension. */
 109 ulong_t linenum;
 110
 111 static const struct option lopts[] = {
 112         {"in-place",    optional_argument,      NULL,   'i'},
 113         {NULL,          0,                      NULL,   0}
 114 };
 115
 116 static void add_compunit(enum e_cut, char *);
 117 static void add_file(char *);
 118 static void usage(void);
 119
 120
 121 int
 122 main(int argc, char *argv[])
 123 {
 124         int c, fflag;
 125         char *temp_arg;
 126
 127         (void) setlocale(LC_ALL, "");
 128
 129 #ifndef TEXT_DOMAIN
 130 #define TEXT_DOMAIN     "SYS_TEST"
 131 #endif
 132         (void) textdomain(TEXT_DOMAIN);
 133
 134         fflag = 0;
 135         inplace = NULL;
 136
 137         while ((c = getopt_long(argc, argv, "EI::ae:f:i::lnr", lopts, NULL)) !=
 138             -1)
 139                 switch (c) {
 140                 case 'r':               /* Gnu sed compat */
 141                 case 'E':
 142                         rflags = REG_EXTENDED;
 143                         break;
 144                 case 'I':
 145                         if (optarg != NULL)
 146                                 inplace = optarg;
 147                         else
 148                                 inplace = "";
 149                         ispan = 1;      /* span across input files */
 150                         break;
 151                 case 'a':
 152                         aflag = 1;
 153                         break;
 154                 case 'e':
 155                         eflag = 1;
 156                         if (asprintf(&temp_arg, "%s\n", optarg) < 1)
 157                                 err(1, "asprintf");
 158                         add_compunit(CU_STRING, temp_arg);
 159                         break;
 160                 case 'f':
 161                         fflag = 1;
 162                         add_compunit(CU_FILE, optarg);
 163                         break;
 164                 case 'i':
 165                         if (optarg != NULL)
 166                                 inplace = optarg;
 167                         else
 168                                 inplace = "";
 169                         ispan = 0;      /* don't span across input files */
 170                         break;
 171                 case 'l':
 172                         /* On SunOS, setlinebuf "returns no useful value */
 173                         (void) setlinebuf(stdout);
 174                         break;
 175                 case 'n':
 176                         nflag = 1;
 177                         break;
 178                 default:
 179                 case '?':
 180                         usage();
 181                 }
 182         argc -= optind;
 183         argv += optind;
 184
 185         /* First usage case; script is the first arg */
 186         if (!eflag && !fflag && *argv) {
 187                 add_compunit(CU_STRING, *argv);
 188                 argv++;
 189         }
 190
 191         compile();
 192
 193         /* Continue with first and start second usage */
 194         if (*argv)
 195                 for (; *argv; argv++)
 196                         add_file(*argv);
 197         else
 198                 add_file(NULL);
 199         process();
 200         cfclose(prog, NULL);
 201         if (fclose(stdout))
 202                 err(1, "stdout");
 203         return (rval);
 204 }
 205
 206 static void
 207 usage(void)
 208 {
 209         (void) fputs(_("usage: sed script [-Ealn] [-i[extension]] [file...]\n"
 210             "       sed [-Ealn] [-i[extension]] [-e script]... "
 211             "[-f script_file]... [file...]\n"),
 212             stderr);
 213         exit(1);
 214 }
 215
 216 /*
 217  * Like fgets, but go through the chain of compilation units chaining them
 218  * together.  Empty strings and files are ignored.
 219  */
 220 char *
 221 cu_fgets(char *buf, int n, int *more)
 222 {
 223         static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
 224         static FILE *f;         /* Current open file */
 225         static char *s;         /* Current pointer inside string */
 226         static char string_ident[30];
 227         char *p;
 228
 229 again:
 230         switch (state) {
 231         case ST_EOF:
 232                 if (script == NULL) {
 233                         if (more != NULL)
 234                                 *more = 0;
 235                         return (NULL);
 236                 }
 237                 linenum = 0;
 238                 switch (script->type) {
 239                 case CU_FILE:
 240                         if ((f = fopen(script->s, "r")) == NULL)
 241                                 err(1, "%s", script->s);
 242                         fname = script->s;
 243                         state = ST_FILE;
 244                         goto again;
 245                 case CU_STRING:
 246                         if (((size_t)snprintf(string_ident,
 247                             sizeof (string_ident), "\"%s\"", script->s)) >=
 248                             sizeof (string_ident) - 1)
 249                                 (void) strcpy(string_ident +
 250                                     sizeof (string_ident) - 6, " ...\"");
 251                         fname = string_ident;
 252                         s = script->s;
 253                         state = ST_STRING;
 254                         goto again;
 255                 default:
 256                         errx(1, "BUG: Unknown script type: %d\n", script->type);
 257                 }
 258                 /*NOTREACHED*/
 259
 260         case ST_FILE:
 261                 if ((p = fgets(buf, n, f)) != NULL) {
 262                         linenum++;
 263                         if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
 264                                 nflag = 1;
 265                         if (more != NULL)
 266                                 *more = !feof(f);
 267                         return (p);
 268                 }
 269                 script = script->next;
 270                 (void) fclose(f);
 271                 state = ST_EOF;
 272                 goto again;
 273         case ST_STRING:
 274                 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
 275                         nflag = 1;
 276                 p = buf;
 277                 for (;;) {
 278                         if (n-- <= 1) {
 279                                 *p = '\0';
 280                                 linenum++;
 281                                 if (more != NULL)
 282                                         *more = 1;
 283                                 return (buf);
 284                         }
 285                         switch (*s) {
 286                         case '\0':
 287                                 state = ST_EOF;
 288                                 if (s == script->s) {
 289                                         script = script->next;
 290                                         goto again;
 291                                 } else {
 292                                         script = script->next;
 293                                         *p = '\0';
 294                                         linenum++;
 295                                         if (more != NULL)
 296                                                 *more = 0;
 297                                         return (buf);
 298                                 }
 299                         case '\n':
 300                                 *p++ = '\n';
 301                                 *p = '\0';
 302                                 s++;
 303                                 linenum++;
 304                                 if (more != NULL)
 305                                         *more = 0;
 306                                 return (buf);
 307                         default:
 308                                 *p++ = *s++;
 309                         }
 310                 }
 311         }
 312         /* NOTREACHED */
 313         return (NULL);
 314 }
 315
 316 /*
 317  * Like fgets, but go through the list of files chaining them together.
 318  * Set len to the length of the line.
 319  */
 320 int
 321 mf_fgets(SPACE *sp, enum e_spflag spflag)
 322 {
 323         struct stat sb, nsb;
 324         ssize_t len;
 325         static char *p = NULL;
 326         static size_t plen = 0;
 327         int c;
 328         static int firstfile;
 329
 330         if (infile == NULL) {
 331                 /* stdin? */
 332                 if (files->fname == NULL) {
 333                         if (inplace != NULL)
 334                                 errx(1,
 335                                     _("-I or -i may not be used with stdin"));
 336                         infile = stdin;
 337                         fname = "stdin";
 338                         outfile = stdout;
 339                         outfname = "stdout";
 340                 }
 341                 firstfile = 1;
 342         }
 343
 344         for (;;) {
 345                 if (infile != NULL && (c = getc(infile)) != EOF) {
 346                         (void) ungetc(c, infile);
 347                         break;
 348                 }
 349                 /* If we are here then either eof or no files are open yet */
 350                 if (infile == stdin) {
 351                         sp->len = 0;
 352                         return (0);
 353                 }
 354                 if (infile != NULL) {
 355                         (void) fclose(infile);
 356                         if (*oldfname != '\0') {
 357                                 /* if there was a backup file, remove it */
 358                                 (void) unlink(oldfname);
 359                                 /*
 360                                  * Backup the original.  Note that hard links
 361                                  * are not supported on all filesystems.
 362                                  */
 363                                 if ((link(fname, oldfname) != 0) &&
 364                                     (rename(fname, oldfname) != 0)) {
 365                                         warn("rename()");
 366                                         if (*tmpfname)
 367                                                 (void) unlink(tmpfname);
 368                                         exit(1);
 369                                 }
 370                                 *oldfname = '\0';
 371                         }
 372                         if (*tmpfname != '\0') {
 373                                 if (outfile != NULL && outfile != stdout)
 374                                         if (fclose(outfile) != 0) {
 375                                                 warn("fclose()");
 376                                                 (void) unlink(tmpfname);
 377                                                 exit(1);
 378                                         }
 379                                 outfile = NULL;
 380                                 if (rename(tmpfname, fname) != 0) {
 381                                         /* this should not happen really! */
 382                                         warn("rename()");
 383                                         (void) unlink(tmpfname);
 384                                         exit(1);
 385                                 }
 386                                 *tmpfname = '\0';
 387                         }
 388                         outfname = NULL;
 389                 }
 390                 if (firstfile == 0)
 391                         files = files->next;
 392                 else
 393                         firstfile = 0;
 394                 if (files == NULL) {
 395                         sp->len = 0;
 396                         return (0);
 397                 }
 398                 fname = files->fname;
 399                 if (inplace != NULL) {
 400                         char bn[PATH_MAX];
 401                         char dn[PATH_MAX];
 402                         (void) strlcpy(bn, fname, sizeof (bn));
 403                         (void) strlcpy(dn, fname, sizeof (dn));
 404                         if (lstat(fname, &sb) != 0)
 405                                 err(1, "%s", fname);
 406                         if (!(sb.st_mode & S_IFREG))
 407                                 fatal(_("in-place editing only "
 408                                     "works for regular files"));
 409                         if (*inplace != '\0') {
 410                                 (void) strlcpy(oldfname, fname,
 411                                     sizeof (oldfname));
 412                                 len = strlcat(oldfname, inplace,
 413                                     sizeof (oldfname));
 414                                 if (len > sizeof (oldfname))
 415                                         fatal(_("name too long"));
 416                         }
 417                         len = snprintf(tmpfname, sizeof (tmpfname),
 418                             "%s/.!%ld!%s", dirname(dn), (long)getpid(),
 419                             basename(bn));
 420                         if (len >= sizeof (tmpfname))
 421                                 fatal(_("name too long"));
 422                         (void) unlink(tmpfname);
 423                         if ((outfile = fopen(tmpfname, "w")) == NULL)
 424                                 err(1, "%s", fname);
 425                         /*
 426                          * Some file systems don't support chown or
 427                          * chmod fully.  On those, the owner/group and
 428                          * permissions will already be set to what
 429                          * they need to be.
 430                          */
 431                         if (fstat(fileno(outfile), &nsb) != 0) {
 432                                 warn("fstat()");
 433                         }
 434                         if (((sb.st_uid != nsb.st_uid) ||
 435                             (sb.st_gid != nsb.st_gid)) &&
 436                             (fchown(fileno(outfile), sb.st_uid, sb.st_gid)
 437                             != 0))
 438                                 warn("fchown()");
 439                         if ((sb.st_mode != nsb.st_mode) &&
 440                             (fchmod(fileno(outfile), sb.st_mode & 07777) != 0))
 441                                 warn("fchmod()");
 442                         outfname = tmpfname;
 443                         if (!ispan) {
 444                                 linenum = 0;
 445                                 resetstate();
 446                         }
 447                 } else {
 448                         outfile = stdout;
 449                         outfname = "stdout";
 450                 }
 451                 if ((infile = fopen(fname, "r")) == NULL) {
 452                         warn("%s", fname);
 453                         rval = 1;
 454                         continue;
 455                 }
 456         }
 457         /*
 458          * We are here only when infile is open and we still have something
 459          * to read from it.
 460          *
 461          * Use getline() so that we can handle essentially infinite
 462          * input data.  The p and plen are static so each invocation gives
 463          * getline() the same buffer which is expanded as needed.
 464          */
 465         len = getline(&p, &plen, infile);
 466         if (len == -1)
 467                 err(1, "%s", fname);
 468         if (len != 0 && p[len - 1] == '\n')
 469                 len--;
 470         cspace(sp, p, len, spflag);
 471
 472         linenum++;
 473
 474         return (1);
 475 }
 476
 477 /*
 478  * Add a compilation unit to the linked list
 479  */
 480 static void
 481 add_compunit(enum e_cut type, char *s)
 482 {
 483         struct s_compunit *cu;
 484
 485         if ((cu = malloc(sizeof (struct s_compunit))) == NULL)
 486                 err(1, "malloc");
 487         cu->type = type;
 488         cu->s = s;
 489         cu->next = NULL;
 490         *cu_nextp = cu;
 491         cu_nextp = &cu->next;
 492 }
 493
 494 /*
 495  * Add a file to the linked list
 496  */
 497 static void
 498 add_file(char *s)
 499 {
 500         struct s_flist *fp;
 501
 502         if ((fp = malloc(sizeof (struct s_flist))) == NULL)
 503                 err(1, "malloc");
 504         fp->next = NULL;
 505         *fl_nextp = fp;
 506         fp->fname = s;
 507         fl_nextp = &fp->next;
 508 }
 509
 510 int
 511 lastline(void)
 512 {
 513         int ch;
 514
 515         if (feof(infile) != 0 || (ch = getc(infile)) == EOF) {
 516                 struct s_flist *f;
 517
 518                 /*
 519                  * Reached the end of the current input file.
 520                  * If there are no more that contain data, then this is the
 521                  * last line.
 522                  */
 523                 if (inplace != NULL && ispan == 0)
 524                         return (1);
 525
 526                 for (f = files->next; f != NULL; f = f->next) {
 527                         struct stat st;
 528
 529                         if (stat(f->fname, &st) == -1) {
 530                                 /* Treat an error here as an empty file */
 531                                 continue;
 532                         }
 533                         if (st.st_size > 0)
 534                                 return (0);
 535                 }
 536                 return (1);
 537         }
 538
 539         (void) ungetc(ch, infile);
 540         return (0);
 541 }