usr.bin/sed/main.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   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 #include <sys/cdefs.h>
  38 #ifndef lint
  39 static const char copyright[] =
  40 "@(#) Copyright (c) 1992, 1993\n\
  41         The Regents of the University of California.  All rights reserved.\n";
  42 #endif
  43
  44 #ifndef lint
  45 static const char sccsid[] = "@(#)main.c        8.2 (Berkeley) 1/3/94";
  46 #endif
  47
  48 #include <sys/types.h>
  49 #include <sys/mman.h>
  50 #include <sys/param.h>
  51 #include <sys/stat.h>
  52
  53 #include <err.h>
  54 #include <errno.h>
  55 #include <fcntl.h>
  56 #include <libgen.h>
  57 #include <limits.h>
  58 #include <locale.h>
  59 #include <regex.h>
  60 #include <stddef.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65
  66 #include "defs.h"
  67 #include "extern.h"
  68
  69 /*
  70  * Linked list of units (strings and files) to be compiled
  71  */
  72 struct s_compunit {
  73         struct s_compunit *next;
  74         enum e_cut {CU_FILE, CU_STRING} type;
  75         char *s;                        /* Pointer to string or fname */
  76 };
  77
  78 /*
  79  * Linked list pointer to compilation units and pointer to current
  80  * next pointer.
  81  */
  82 static struct s_compunit *script, **cu_nextp = &script;
  83
  84 /*
  85  * Linked list of files to be processed
  86  */
  87 struct s_flist {
  88         char *fname;
  89         struct s_flist *next;
  90 };
  91
  92 /*
  93  * Linked list pointer to files and pointer to current
  94  * next pointer.
  95  */
  96 static struct s_flist *files, **fl_nextp = &files;
  97
  98 FILE *infile;                   /* Current input file */
  99 FILE *outfile;                  /* Current output file */
 100
 101 int aflag, eflag, nflag;
 102 int rflags = 0;
 103 int quit = 0;
 104 static int rval;                /* Exit status */
 105
 106 static int ispan;               /* Whether inplace editing spans across files */
 107
 108 /*
 109  * Current file and line number; line numbers restart across compilation
 110  * units, but span across input files.  The latter is optional if editing
 111  * in place.
 112  */
 113 const char *fname;              /* File name. */
 114 const char *outfname;           /* Output file name */
 115 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
 116 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
 117 const char *inplace;            /* Inplace edit file extension. */
 118 u_long linenum;
 119
 120 static void add_compunit(enum e_cut, char *);
 121 static void add_file(char *);
 122 static void usage(void) __dead2;
 123
 124 int
 125 main(int argc, char *argv[])
 126 {
 127         int c, fflag, fflagstdin;
 128         char *temp_arg;
 129
 130         (void) setlocale(LC_ALL, "");
 131
 132         fflag = 0;
 133         fflagstdin = 0;
 134         inplace = NULL;
 135
 136         while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1)
 137                 switch (c) {
 138                 case 'r':               /* Gnu sed compat */
 139                 case 'E':
 140                         rflags = REG_EXTENDED;
 141                         break;
 142                 case 'I':
 143                         inplace = optarg;
 144                         ispan = 1;      /* span across input files */
 145                         break;
 146                 case 'a':
 147                         aflag = 1;
 148                         break;
 149                 case 'e':
 150                         eflag = 1;
 151                         if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
 152                                 err(1, "malloc");
 153                         strcpy(temp_arg, optarg);
 154                         strcat(temp_arg, "\n");
 155                         add_compunit(CU_STRING, temp_arg);
 156                         break;
 157                 case 'f':
 158                         fflag = 1;
 159                         if (strcmp(optarg, "-") == 0)
 160                                 fflagstdin = 1;
 161                         add_compunit(CU_FILE, optarg);
 162                         break;
 163                 case 'i':
 164                         inplace = optarg;
 165                         ispan = 0;      /* don't span across input files */
 166                         break;
 167                 case 'l':
 168                         if(setvbuf(stdout, NULL, _IOLBF, 0) != 0)
 169                                 warnx("setting line buffered output failed");
 170                         break;
 171                 case 'n':
 172                         nflag = 1;
 173                         break;
 174                 case 'u':
 175                         if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
 176                                 warnx("setting unbuffered output failed");
 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 if (fflagstdin)
 198                 exit(rval);
 199         else
 200                 add_file(NULL);
 201         process();
 202         cfclose(prog, NULL);
 203         if (fclose(stdout))
 204                 err(1, "stdout");
 205         exit(rval);
 206 }
 207
 208 static void
 209 usage(void)
 210 {
 211         (void)fprintf(stderr,
 212             "usage: %s script [-Ealnru] [-i extension] [file ...]\n"
 213             "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
 214             " ... [file ...]\n", getprogname(), getprogname());
 215         exit(1);
 216 }
 217
 218 /*
 219  * Like fgets, but go through the chain of compilation units chaining them
 220  * together.  Empty strings and files are ignored.
 221  */
 222 char *
 223 cu_fgets(char *buf, int n, int *more)
 224 {
 225         static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
 226         static FILE *f;         /* Current open file */
 227         static char *s;         /* Current pointer inside string */
 228         static char string_ident[30];
 229         char *p;
 230
 231 again:
 232         switch (state) {
 233         case ST_EOF:
 234                 if (script == NULL) {
 235                         if (more != NULL)
 236                                 *more = 0;
 237                         return (NULL);
 238                 }
 239                 linenum = 0;
 240                 switch (script->type) {
 241                 case CU_FILE:
 242                         if (strcmp(script->s, "-") == 0) {
 243                                 f = stdin;
 244                                 fname = "stdin";
 245                         } else {
 246                                 if ((f = fopen(script->s, "r")) == NULL)
 247                                         err(1, "%s", script->s);
 248                                 fname = script->s;
 249                         }
 250                         state = ST_FILE;
 251                         goto again;
 252                 case CU_STRING:
 253                         if (((size_t)snprintf(string_ident,
 254                             sizeof(string_ident), "\"%s\"", script->s)) >=
 255                             sizeof(string_ident) - 1)
 256                                 (void)strcpy(string_ident +
 257                                     sizeof(string_ident) - 6, " ...\"");
 258                         fname = string_ident;
 259                         s = script->s;
 260                         state = ST_STRING;
 261                         goto again;
 262                 default:
 263                         __unreachable();
 264                 }
 265         case ST_FILE:
 266                 if ((p = fgets(buf, n, f)) != NULL) {
 267                         linenum++;
 268                         if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
 269                                 nflag = 1;
 270                         if (more != NULL)
 271                                 *more = !feof(f);
 272                         return (p);
 273                 }
 274                 script = script->next;
 275                 (void)fclose(f);
 276                 state = ST_EOF;
 277                 goto again;
 278         case ST_STRING:
 279                 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
 280                         nflag = 1;
 281                 p = buf;
 282                 for (;;) {
 283                         if (n-- <= 1) {
 284                                 *p = '\0';
 285                                 linenum++;
 286                                 if (more != NULL)
 287                                         *more = 1;
 288                                 return (buf);
 289                         }
 290                         switch (*s) {
 291                         case '\0':
 292                                 state = ST_EOF;
 293                                 if (s == script->s) {
 294                                         script = script->next;
 295                                         goto again;
 296                                 } else {
 297                                         script = script->next;
 298                                         *p = '\0';
 299                                         linenum++;
 300                                         if (more != NULL)
 301                                                 *more = 0;
 302                                         return (buf);
 303                                 }
 304                         case '\n':
 305                                 *p++ = '\n';
 306                                 *p = '\0';
 307                                 s++;
 308                                 linenum++;
 309                                 if (more != NULL)
 310                                         *more = 0;
 311                                 return (buf);
 312                         default:
 313                                 *p++ = *s++;
 314                         }
 315                 }
 316         }
 317         /* NOTREACHED */
 318         return (NULL);
 319 }
 320
 321 /*
 322  * Like fgets, but go through the list of files chaining them together.
 323  * Set len to the length of the line.
 324  */
 325 int
 326 mf_fgets(SPACE *sp, enum e_spflag spflag)
 327 {
 328         struct stat sb;
 329         ssize_t len;
 330         char *dirbuf, *basebuf;
 331         static char *p = NULL;
 332         static size_t plen = 0;
 333         int c;
 334         static int firstfile;
 335
 336         if (infile == NULL) {
 337                 /* stdin? */
 338                 if (files->fname == NULL) {
 339                         if (inplace != NULL)
 340                                 errx(1, "-I or -i may not be used with stdin");
 341                         infile = stdin;
 342                         fname = "stdin";
 343                         outfile = stdout;
 344                         outfname = "stdout";
 345                 }
 346                 firstfile = 1;
 347         }
 348
 349         for (;;) {
 350                 if (infile != NULL && (c = getc(infile)) != EOF && !quit) {
 351                         (void)ungetc(c, infile);
 352                         break;
 353                 }
 354                 /* If we are here then either eof or no files are open yet */
 355                 if (infile == stdin) {
 356                         sp->len = 0;
 357                         return (0);
 358                 }
 359                 if (infile != NULL) {
 360                         fclose(infile);
 361                         if (*oldfname != '\0') {
 362                                 /* if there was a backup file, remove it */
 363                                 unlink(oldfname);
 364                                 /*
 365                                  * Backup the original.  Note that hard links
 366                                  * are not supported on all filesystems.
 367                                  */
 368                                 if ((link(fname, oldfname) != 0) &&
 369                                    (rename(fname, oldfname) != 0)) {
 370                                         warn("rename()");
 371                                         if (*tmpfname)
 372                                                 unlink(tmpfname);
 373                                         exit(1);
 374                                 }
 375                                 *oldfname = '\0';
 376                         }
 377                         if (*tmpfname != '\0') {
 378                                 if (outfile != NULL && outfile != stdout)
 379                                         if (fclose(outfile) != 0) {
 380                                                 warn("fclose()");
 381                                                 unlink(tmpfname);
 382                                                 exit(1);
 383                                         }
 384                                 outfile = NULL;
 385                                 if (rename(tmpfname, fname) != 0) {
 386                                         /* this should not happen really! */
 387                                         warn("rename()");
 388                                         unlink(tmpfname);
 389                                         exit(1);
 390                                 }
 391                                 *tmpfname = '\0';
 392                         }
 393                         outfname = NULL;
 394                 }
 395                 if (firstfile == 0)
 396                         files = files->next;
 397                 else
 398                         firstfile = 0;
 399                 if (files == NULL) {
 400                         sp->len = 0;
 401                         return (0);
 402                 }
 403                 fname = files->fname;
 404                 if (inplace != NULL) {
 405                         if (lstat(fname, &sb) != 0)
 406                                 err(1, "%s", fname);
 407                         if (!S_ISREG(sb.st_mode))
 408                                 errx(1, "%s: %s %s", fname,
 409                                     "in-place editing only",
 410                                     "works for regular files");
 411                         if (*inplace != '\0') {
 412                                 strlcpy(oldfname, fname,
 413                                     sizeof(oldfname));
 414                                 len = strlcat(oldfname, inplace,
 415                                     sizeof(oldfname));
 416                                 if (len > (ssize_t)sizeof(oldfname))
 417                                         errx(1, "%s: name too long", fname);
 418                         }
 419                         if ((dirbuf = strdup(fname)) == NULL ||
 420                             (basebuf = strdup(fname)) == NULL)
 421                                 err(1, "strdup");
 422                         len = snprintf(tmpfname, sizeof(tmpfname),
 423                             "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(),
 424                             basename(basebuf));
 425                         free(dirbuf);
 426                         free(basebuf);
 427                         if (len >= (ssize_t)sizeof(tmpfname))
 428                                 errx(1, "%s: name too long", fname);
 429                         unlink(tmpfname);
 430                         if (outfile != NULL && outfile != stdout)
 431                                 fclose(outfile);
 432                         if ((outfile = fopen(tmpfname, "w")) == NULL)
 433                                 err(1, "%s", fname);
 434                         fchown(fileno(outfile), sb.st_uid, sb.st_gid);
 435                         fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
 436                         outfname = tmpfname;
 437                         if (!ispan) {
 438                                 linenum = 0;
 439                                 resetstate();
 440                         }
 441                 } else {
 442                         outfile = stdout;
 443                         outfname = "stdout";
 444                 }
 445                 if ((infile = fopen(fname, "r")) == NULL) {
 446                         warn("%s", fname);
 447                         rval = 1;
 448                         continue;
 449                 }
 450         }
 451         /*
 452          * We are here only when infile is open and we still have something
 453          * to read from it.
 454          *
 455          * Use getline() so that we can handle essentially infinite input
 456          * data.  The p and plen are static so each invocation gives
 457          * getline() the same buffer which is expanded as needed.
 458          */
 459         len = getline(&p, &plen, infile);
 460         if (len == -1)
 461                 err(1, "%s", fname);
 462         if (len != 0 && p[len - 1] == '\n') {
 463                 sp->append_newline = 1;
 464                 len--;
 465         } else if (!lastline()) {
 466                 sp->append_newline = 1;
 467         } else {
 468                 sp->append_newline = 0;
 469         }
 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 static int
 511 next_files_have_lines(void)
 512 {
 513         struct s_flist *file;
 514         FILE *file_fd;
 515         int ch;
 516
 517         file = files;
 518         while ((file = file->next) != NULL) {
 519                 if ((file_fd = fopen(file->fname, "r")) == NULL)
 520                         continue;
 521
 522                 if ((ch = getc(file_fd)) != EOF) {
 523                         /*
 524                          * This next file has content, therefore current
 525                          * file doesn't contains the last line.
 526                          */
 527                         ungetc(ch, file_fd);
 528                         fclose(file_fd);
 529                         return (1);
 530                 }
 531
 532                 fclose(file_fd);
 533         }
 534
 535         return (0);
 536 }
 537
 538 int
 539 lastline(void)
 540 {
 541         int ch;
 542
 543         if (feof(infile)) {
 544                 return !(
 545                     (inplace == NULL || ispan) &&
 546                     next_files_have_lines());
 547         }
 548         if ((ch = getc(infile)) == EOF) {
 549                 return !(
 550                     (inplace == NULL || ispan) &&
 551                     next_files_have_lines());
 552         }
 553         ungetc(ch, infile);
 554         return (0);
 555 }