usr.bin/sed/main.c

   1 /*      $NetBSD: main.c,v 1.34 2015/03/12 12:40:41 christos Exp $       */
   2
   3 /*-
   4  * Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson.
   5  * Copyright (c) 1992 Diomidis Spinellis.
   6  * Copyright (c) 1992, 1993
   7  *      The Regents of the University of California.  All rights reserved.
   8  *
   9  * This code is derived from software contributed to Berkeley by
  10  * Diomidis Spinellis of Imperial College, University of London.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #if HAVE_NBTOOL_CONFIG_H
  38 #include "nbtool_config.h"
  39 #endif
  40
  41 #include <sys/cdefs.h>
  42 __RCSID("$NetBSD: main.c,v 1.34 2015/03/12 12:40:41 christos Exp $");
  43 #ifdef __FBSDID
  44 __FBSDID("$FreeBSD: head/usr.bin/sed/main.c 252231 2013-06-26 04:14:19Z pfg $");
  45 #endif
  46
  47 #ifndef lint
  48 __COPYRIGHT("@(#) Copyright (c) 1992, 1993\
  49         The Regents of the University of California.  All rights reserved.");
  50 #endif
  51
  52 #if 0
  53 static const char sccsid[] = "@(#)main.c        8.2 (Berkeley) 1/3/94";
  54 #endif
  55
  56 #include <sys/types.h>
  57 #include <sys/mman.h>
  58 #include <sys/param.h>
  59 #include <sys/stat.h>
  60
  61 #include <err.h>
  62 #include <errno.h>
  63 #include <fcntl.h>
  64 #include <libgen.h>
  65 #include <limits.h>
  66 #include <locale.h>
  67 #include <regex.h>
  68 #include <stddef.h>
  69 #define _WITH_GETLINE
  70 #include <stdio.h>
  71 #include <stdlib.h>
  72 #include <string.h>
  73 #include <unistd.h>
  74
  75 #include "defs.h"
  76 #include "extern.h"
  77
  78 /*
  79  * Linked list of units (strings and files) to be compiled
  80  */
  81 struct s_compunit {
  82         struct s_compunit *next;
  83         enum e_cut {CU_FILE, CU_STRING} type;
  84         char *s;                        /* Pointer to string or fname */
  85 };
  86
  87 /*
  88  * Linked list pointer to compilation units and pointer to current
  89  * next pointer.
  90  */
  91 static struct s_compunit *script, **cu_nextp = &script;
  92
  93 /*
  94  * Linked list of files to be processed
  95  */
  96 struct s_flist {
  97         char *fname;
  98         struct s_flist *next;
  99 };
 100
 101 /*
 102  * Linked list pointer to files and pointer to current
 103  * next pointer.
 104  */
 105 static struct s_flist *files, **fl_nextp = &files;
 106
 107 FILE *infile;                   /* Current input file */
 108 FILE *outfile;                  /* Current output file */
 109
 110 int aflag, eflag, nflag;
 111 int rflags = 0;
 112 static int rval;                /* Exit status */
 113
 114 static int ispan;               /* Whether inplace editing spans across files */
 115
 116 /*
 117  * Current file and line number; line numbers restart across compilation
 118  * units, but span across input files.  The latter is optional if editing
 119  * in place.
 120  */
 121 const char *fname;              /* File name. */
 122 const char *outfname;           /* Output file name */
 123 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
 124 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
 125 static const char *inplace;     /* Inplace edit file extension. */
 126 u_long linenum;
 127
 128 static void add_compunit(enum e_cut, char *);
 129 static void add_file(char *);
 130 static void usage(void) __dead;
 131
 132 int
 133 main(int argc, char *argv[])
 134 {
 135         int c, fflag;
 136         char *temp_arg;
 137
 138         setprogname(argv[0]);
 139         (void) setlocale(LC_ALL, "");
 140
 141         fflag = 0;
 142         inplace = NULL;
 143
 144         while ((c = getopt(argc, argv, "EI::ae:f:i::lnru")) != -1)
 145                 switch (c) {
 146                 case 'r':               /* Gnu sed compat */
 147                 case 'E':
 148                         rflags = REG_EXTENDED;
 149                         break;
 150                 case 'I':
 151                         inplace = optarg ? optarg : __UNCONST("");
 152                         ispan = 1;      /* span across input files */
 153                         break;
 154                 case 'a':
 155                         aflag = 1;
 156                         break;
 157                 case 'e':
 158                         eflag = 1;
 159                         temp_arg = xmalloc(strlen(optarg) + 2);
 160                         strcpy(temp_arg, optarg);
 161                         strcat(temp_arg, "\n");
 162                         add_compunit(CU_STRING, temp_arg);
 163                         break;
 164                 case 'f':
 165                         fflag = 1;
 166                         add_compunit(CU_FILE, optarg);
 167                         break;
 168                 case 'i':
 169                         inplace = optarg ? optarg : __UNCONST("");
 170                         ispan = 0;      /* don't span across input files */
 171                         break;
 172                 case 'l':
 173 #ifdef _IOLBF
 174                         c = setvbuf(stdout, NULL, _IOLBF, 0);
 175 #else
 176                         c = setlinebuf(stdout);
 177 #endif
 178                         if (c)
 179                                 warn("setting line buffered output failed");
 180                         break;
 181                 case 'n':
 182                         nflag = 1;
 183                         break;
 184                 case 'u':
 185 #ifdef _IONBF
 186                         c = setvbuf(stdout, NULL, _IONBF, 0);
 187 #else
 188                         c = -1;
 189                         errno = EOPNOTSUPP;
 190 #endif
 191                         if (c)
 192                                 warn("setting unbuffered output failed");
 193                         break;
 194                 default:
 195                 case '?':
 196                         usage();
 197                 }
 198         argc -= optind;
 199         argv += optind;
 200
 201         /* First usage case; script is the first arg */
 202         if (!eflag && !fflag && *argv) {
 203                 add_compunit(CU_STRING, *argv);
 204                 argv++;
 205         }
 206
 207         compile();
 208
 209         /* Continue with first and start second usage */
 210         if (*argv)
 211                 for (; *argv; argv++)
 212                         add_file(*argv);
 213         else
 214                 add_file(NULL);
 215         process();
 216         cfclose(prog, NULL);
 217         if (fclose(stdout))
 218                 err(1, "stdout");
 219         exit(rval);
 220 }
 221
 222 static void
 223 usage(void)
 224 {
 225         (void)fprintf(stderr,
 226             "Usage:  %s [-aElnru] command [file ...]\n"
 227             "\t%s [-aElnru] [-e command] [-f command_file] [-I[extension]]\n"
 228             "\t    [-i[extension]] [file ...]\n", getprogname(), getprogname());
 229         exit(1);
 230 }
 231
 232 /*
 233  * Like fgets, but go through the chain of compilation units chaining them
 234  * together.  Empty strings and files are ignored.
 235  */
 236 char *
 237 cu_fgets(char *buf, int n, int *more)
 238 {
 239         static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
 240         static FILE *f;         /* Current open file */
 241         static char *s;         /* Current pointer inside string */
 242         static char string_ident[30];
 243         char *p;
 244
 245 again:
 246         switch (state) {
 247         case ST_EOF:
 248                 if (script == NULL) {
 249                         if (more != NULL)
 250                                 *more = 0;
 251                         return (NULL);
 252                 }
 253                 linenum = 0;
 254                 switch (script->type) {
 255                 case CU_FILE:
 256                         if ((f = fopen(script->s, "r")) == NULL)
 257                                 err(1, "%s", script->s);
 258                         fname = script->s;
 259                         state = ST_FILE;
 260                         goto again;
 261                 case CU_STRING:
 262                         if (((size_t)snprintf(string_ident,
 263                             sizeof(string_ident), "\"%s\"", script->s)) >=
 264                             sizeof(string_ident) - 1)
 265                                 (void)strcpy(string_ident +
 266                                     sizeof(string_ident) - 6, " ...\"");
 267                         fname = string_ident;
 268                         s = script->s;
 269                         state = ST_STRING;
 270                         goto again;
 271                 }
 272         case ST_FILE:
 273                 if ((p = fgets(buf, n, f)) != NULL) {
 274                         linenum++;
 275                         if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
 276                                 nflag = 1;
 277                         if (more != NULL)
 278                                 *more = !feof(f);
 279                         return (p);
 280                 }
 281                 script = script->next;
 282                 (void)fclose(f);
 283                 state = ST_EOF;
 284                 goto again;
 285         case ST_STRING:
 286                 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
 287                         nflag = 1;
 288                 p = buf;
 289                 for (;;) {
 290                         if (n-- <= 1) {
 291                                 *p = '\0';
 292                                 linenum++;
 293                                 if (more != NULL)
 294                                         *more = 1;
 295                                 return (buf);
 296                         }
 297                         switch (*s) {
 298                         case '\0':
 299                                 state = ST_EOF;
 300                                 if (s == script->s) {
 301                                         script = script->next;
 302                                         goto again;
 303                                 } else {
 304                                         script = script->next;
 305                                         *p = '\0';
 306                                         linenum++;
 307                                         if (more != NULL)
 308                                                 *more = 0;
 309                                         return (buf);
 310                                 }
 311                         case '\n':
 312                                 *p++ = '\n';
 313                                 *p = '\0';
 314                                 s++;
 315                                 linenum++;
 316                                 if (more != NULL)
 317                                         *more = 0;
 318                                 return (buf);
 319                         default:
 320                                 *p++ = *s++;
 321                         }
 322                 }
 323         }
 324         /* NOTREACHED */
 325         return (NULL);
 326 }
 327
 328 /*
 329  * Like fgets, but go through the list of files chaining them together.
 330  * Set len to the length of the line.
 331  */
 332 int
 333 mf_fgets(SPACE *sp, enum e_spflag spflag)
 334 {
 335         struct stat sb;
 336         size_t len;
 337         static char *p = NULL;
 338         static size_t plen = 0;
 339         int c;
 340         static int firstfile;
 341
 342         if (infile == NULL) {
 343                 /* stdin? */
 344                 if (files->fname == NULL) {
 345                         if (inplace != NULL)
 346                                 errx(1, "-I or -i may not be used with stdin");
 347                         infile = stdin;
 348                         fname = "stdin";
 349                         outfile = stdout;
 350                         outfname = "stdout";
 351                 }
 352                 firstfile = 1;
 353         }
 354
 355         for (;;) {
 356                 if (infile != NULL && (c = getc(infile)) != EOF) {
 357                         (void)ungetc(c, infile);
 358                         break;
 359                 }
 360                 /* If we are here then either eof or no files are open yet */
 361                 if (infile == stdin) {
 362                         sp->len = 0;
 363                         return (0);
 364                 }
 365                 if (infile != NULL) {
 366                         fclose(infile);
 367                         if (*oldfname != '\0') {
 368                                 /* if there was a backup file, remove it */
 369                                 unlink(oldfname);
 370                                 /*
 371                                  * Backup the original.  Note that hard links
 372                                  * are not supported on all filesystems.
 373                                  */
 374                                 if ((link(fname, oldfname) != 0) &&
 375                                    (rename(fname, oldfname) != 0)) {
 376                                         warn("rename()");
 377                                         if (*tmpfname)
 378                                                 unlink(tmpfname);
 379                                         exit(1);
 380                                 }
 381                                 *oldfname = '\0';
 382                         }
 383                         if (*tmpfname != '\0') {
 384                                 if (outfile != NULL && outfile != stdout)
 385                                         if (fclose(outfile) != 0) {
 386                                                 warn("fclose()");
 387                                                 unlink(tmpfname);
 388                                                 exit(1);
 389                                         }
 390                                 outfile = NULL;
 391                                 if (rename(tmpfname, fname) != 0) {
 392                                         /* this should not happen really! */
 393                                         warn("rename()");
 394                                         unlink(tmpfname);
 395                                         exit(1);
 396                                 }
 397                                 *tmpfname = '\0';
 398                         }
 399                         outfname = NULL;
 400                 }
 401                 if (firstfile == 0)
 402                         files = files->next;
 403                 else
 404                         firstfile = 0;
 405                 if (files == NULL) {
 406                         sp->len = 0;
 407                         return (0);
 408                 }
 409                 fname = files->fname;
 410                 if (inplace != NULL) {
 411                         if (lstat(fname, &sb) != 0)
 412                                 err(1, "%s", fname);
 413                         if (!(sb.st_mode & S_IFREG))
 414                                 errx(1, "%s: %s %s", fname,
 415                                     "in-place editing only",
 416                                     "works for regular files");
 417                         if (*inplace != '\0') {
 418                                 strlcpy(oldfname, fname,
 419                                     sizeof(oldfname));
 420                                 len = strlcat(oldfname, inplace,
 421                                     sizeof(oldfname));
 422                                 if (len > sizeof(oldfname))
 423                                         errx(1, "%s: name too long", fname);
 424                         }
 425                         char d_name[PATH_MAX], f_name[PATH_MAX];
 426                         (void)strlcpy(d_name, fname, sizeof(d_name));
 427                         (void)strlcpy(f_name, fname, sizeof(f_name));
 428                         len = (size_t)snprintf(tmpfname, sizeof(tmpfname),
 429                             "%s/.!%ld!%s", dirname(d_name), (long)getpid(),
 430                             basename(f_name));
 431                         if (len >= sizeof(tmpfname))
 432                                 errx(1, "%s: name too long", fname);
 433                         unlink(tmpfname);
 434                         if (outfile != NULL && outfile != stdout)
 435                                 fclose(outfile);
 436                         if ((outfile = fopen(tmpfname, "w")) == NULL)
 437                                 err(1, "%s", fname);
 438                         fchown(fileno(outfile), sb.st_uid, sb.st_gid);
 439                         fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
 440                         outfname = tmpfname;
 441                         if (!ispan) {
 442                                 linenum = 0;
 443                                 resetstate();
 444                         }
 445                 } else {
 446                         outfile = stdout;
 447                         outfname = "stdout";
 448                 }
 449                 if ((infile = fopen(fname, "r")) == NULL) {
 450                         warn("%s", fname);
 451                         rval = 1;
 452                         continue;
 453                 }
 454         }
 455         /*
 456          * We are here only when infile is open and we still have something
 457          * to read from it.
 458          *
 459          * Use getline() so that we can handle essentially infinite input
 460          * data.  The p and plen are static so each invocation gives
 461          * getline() the same buffer which is expanded as needed.
 462          */
 463         ssize_t slen = getline(&p, &plen, infile);
 464         if (slen == -1)
 465                 err(1, "%s", fname);
 466         if (slen != 0 && p[slen - 1] == '\n')
 467                 slen--;
 468         cspace(sp, p, (size_t)slen, spflag);
 469
 470         linenum++;
 471
 472         return (1);
 473 }
 474
 475 /*
 476  * Add a compilation unit to the linked list
 477  */
 478 static void
 479 add_compunit(enum e_cut type, char *s)
 480 {
 481         struct s_compunit *cu;
 482
 483         cu = xmalloc(sizeof(struct s_compunit));
 484         cu->type = type;
 485         cu->s = s;
 486         cu->next = NULL;
 487         *cu_nextp = cu;
 488         cu_nextp = &cu->next;
 489 }
 490
 491 /*
 492  * Add a file to the linked list
 493  */
 494 static void
 495 add_file(char *s)
 496 {
 497         struct s_flist *fp;
 498
 499         fp = xmalloc(sizeof(struct s_flist));
 500         fp->next = NULL;
 501         *fl_nextp = fp;
 502         fp->fname = s;
 503         fl_nextp = &fp->next;
 504 }
 505
 506 int
 507 lastline(void)
 508 {
 509         int ch;
 510
 511         if (files->next != NULL && (inplace == NULL || ispan))
 512                 return (0);
 513         if ((ch = getc(infile)) == EOF)
 514                 return (1);
 515         ungetc(ch, infile);
 516         return (0);
 517 }