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 __FBSDID("$FreeBSD$");
  39
  40 #ifndef lint
  41 static const char copyright[] =
  42 "@(#) Copyright (c) 1992, 1993\n\
  43         The Regents of the University of California.  All rights reserved.\n";
  44 #endif
  45
  46 #ifndef lint
  47 static const char sccsid[] = "@(#)main.c        8.2 (Berkeley) 1/3/94";
  48 #endif
  49
  50 #include <sys/types.h>
  51 #include <sys/mman.h>
  52 #include <sys/param.h>
  53 #include <sys/stat.h>
  54
  55 #include <err.h>
  56 #include <errno.h>
  57 #include <fcntl.h>
  58 #include <libgen.h>
  59 #include <limits.h>
  60 #include <locale.h>
  61 #include <regex.h>
  62 #include <stddef.h>
  63 #include <stdio.h>
  64 #include <stdlib.h>
  65 #include <string.h>
  66 #include <unistd.h>
  67
  68 #include "defs.h"
  69 #include "extern.h"
  70
  71 /*
  72  * Linked list of units (strings and files) to be compiled
  73  */
  74 struct s_compunit {
  75         struct s_compunit *next;
  76         enum e_cut {CU_FILE, CU_STRING} type;
  77         char *s;                        /* Pointer to string or fname */
  78 };
  79
  80 /*
  81  * Linked list pointer to compilation units and pointer to current
  82  * next pointer.
  83  */
  84 static struct s_compunit *script, **cu_nextp = &script;
  85
  86 /*
  87  * Linked list of files to be processed
  88  */
  89 struct s_flist {
  90         char *fname;
  91         struct s_flist *next;
  92 };
  93
  94 /*
  95  * Linked list pointer to files and pointer to current
  96  * next pointer.
  97  */
  98 static struct s_flist *files, **fl_nextp = &files;
  99
 100 FILE *infile;                   /* Current input file */
 101 FILE *outfile;                  /* Current output file */
 102
 103 int aflag, eflag, nflag;
 104 int rflags = 0;
 105 static int rval;                /* Exit status */
 106
 107 static int ispan;               /* Whether inplace editing spans across files */
 108
 109 /*
 110  * Current file and line number; line numbers restart across compilation
 111  * units, but span across input files.  The latter is optional if editing
 112  * in place.
 113  */
 114 const char *fname;              /* File name. */
 115 const char *outfname;           /* Output file name */
 116 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
 117 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
 118 static const char *inplace;     /* Inplace edit file extension. */
 119 u_long linenum;
 120
 121 static void add_compunit(enum e_cut, char *);
 122 static void add_file(char *);
 123 static void usage(void);
 124
 125 int
 126 main(int argc, char *argv[])
 127 {
 128         int c, fflag;
 129         char *temp_arg;
 130
 131         (void) setlocale(LC_ALL, "");
 132
 133         fflag = 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                         add_compunit(CU_FILE, optarg);
 160                         break;
 161                 case 'i':
 162                         inplace = optarg;
 163                         ispan = 0;      /* don't span across input files */
 164                         break;
 165                 case 'l':
 166                         if(setvbuf(stdout, NULL, _IOLBF, 0) != 0)
 167                                 warnx("setting line buffered output failed");
 168                         break;
 169                 case 'n':
 170                         nflag = 1;
 171                         break;
 172                 case 'u':
 173                         if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
 174                                 warnx("setting unbuffered output failed");
 175                         break;
 176                 default:
 177                 case '?':
 178                         usage();
 179                 }
 180         argc -= optind;
 181         argv += optind;
 182
 183         /* First usage case; script is the first arg */
 184         if (!eflag && !fflag && *argv) {
 185                 add_compunit(CU_STRING, *argv);
 186                 argv++;
 187         }
 188
 189         compile();
 190
 191         /* Continue with first and start second usage */
 192         if (*argv)
 193                 for (; *argv; argv++)
 194                         add_file(*argv);
 195         else
 196                 add_file(NULL);
 197         process();
 198         cfclose(prog, NULL);
 199         if (fclose(stdout))
 200                 err(1, "stdout");
 201         exit(rval);
 202 }
 203
 204 static void
 205 usage(void)
 206 {
 207         (void)fprintf(stderr,
 208             "usage: %s script [-Ealnru] [-i extension] [file ...]\n"
 209             "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
 210             " ... [file ...]\n", getprogname(), getprogname());
 211         exit(1);
 212 }
 213
 214 /*
 215  * Like fgets, but go through the chain of compilation units chaining them
 216  * together.  Empty strings and files are ignored.
 217  */
 218 char *
 219 cu_fgets(char *buf, int n, int *more)
 220 {
 221         static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
 222         static FILE *f;         /* Current open file */
 223         static char *s;         /* Current pointer inside string */
 224         static char string_ident[30];
 225         char *p;
 226
 227 again:
 228         switch (state) {
 229         case ST_EOF:
 230                 if (script == NULL) {
 231                         if (more != NULL)
 232                                 *more = 0;
 233                         return (NULL);
 234                 }
 235                 linenum = 0;
 236                 switch (script->type) {
 237                 case CU_FILE:
 238                         if ((f = fopen(script->s, "r")) == NULL)
 239                                 err(1, "%s", script->s);
 240                         fname = script->s;
 241                         state = ST_FILE;
 242                         goto again;
 243                 case CU_STRING:
 244                         if (((size_t)snprintf(string_ident,
 245                             sizeof(string_ident), "\"%s\"", script->s)) >=
 246                             sizeof(string_ident) - 1)
 247                                 (void)strcpy(string_ident +
 248                                     sizeof(string_ident) - 6, " ...\"");
 249                         fname = string_ident;
 250                         s = script->s;
 251                         state = ST_STRING;
 252                         goto again;
 253                 default:
 254                         __unreachable();
 255                 }
 256         case ST_FILE:
 257                 if ((p = fgets(buf, n, f)) != NULL) {
 258                         linenum++;
 259                         if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
 260                                 nflag = 1;
 261                         if (more != NULL)
 262                                 *more = !feof(f);
 263                         return (p);
 264                 }
 265                 script = script->next;
 266                 (void)fclose(f);
 267                 state = ST_EOF;
 268                 goto again;
 269         case ST_STRING:
 270                 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
 271                         nflag = 1;
 272                 p = buf;
 273                 for (;;) {
 274                         if (n-- <= 1) {
 275                                 *p = '\0';
 276                                 linenum++;
 277                                 if (more != NULL)
 278                                         *more = 1;
 279                                 return (buf);
 280                         }
 281                         switch (*s) {
 282                         case '\0':
 283                                 state = ST_EOF;
 284                                 if (s == script->s) {
 285                                         script = script->next;
 286                                         goto again;
 287                                 } else {
 288                                         script = script->next;
 289                                         *p = '\0';
 290                                         linenum++;
 291                                         if (more != NULL)
 292                                                 *more = 0;
 293                                         return (buf);
 294                                 }
 295                         case '\n':
 296                                 *p++ = '\n';
 297                                 *p = '\0';
 298                                 s++;
 299                                 linenum++;
 300                                 if (more != NULL)
 301                                         *more = 0;
 302                                 return (buf);
 303                         default:
 304                                 *p++ = *s++;
 305                         }
 306                 }
 307         }
 308         /* NOTREACHED */
 309         return (NULL);
 310 }
 311
 312 /*
 313  * Like fgets, but go through the list of files chaining them together.
 314  * Set len to the length of the line.
 315  */
 316 int
 317 mf_fgets(SPACE *sp, enum e_spflag spflag)
 318 {
 319         struct stat sb;
 320         ssize_t len;
 321         char *dirbuf, *basebuf;
 322         static char *p = NULL;
 323         static size_t plen = 0;
 324         int c;
 325         static int firstfile;
 326
 327         if (infile == NULL) {
 328                 /* stdin? */
 329                 if (files->fname == NULL) {
 330                         if (inplace != NULL)
 331                                 errx(1, "-I or -i may not be used with stdin");
 332                         infile = stdin;
 333                         fname = "stdin";
 334                         outfile = stdout;
 335                         outfname = "stdout";
 336                 }
 337                 firstfile = 1;
 338         }
 339
 340         for (;;) {
 341                 if (infile != NULL && (c = getc(infile)) != EOF) {
 342                         (void)ungetc(c, infile);
 343                         break;
 344                 }
 345                 /* If we are here then either eof or no files are open yet */
 346                 if (infile == stdin) {
 347                         sp->len = 0;
 348                         return (0);
 349                 }
 350                 if (infile != NULL) {
 351                         fclose(infile);
 352                         if (*oldfname != '\0') {
 353                                 /* if there was a backup file, remove it */
 354                                 unlink(oldfname);
 355                                 /*
 356                                  * Backup the original.  Note that hard links
 357                                  * are not supported on all filesystems.
 358                                  */
 359                                 if ((link(fname, oldfname) != 0) &&
 360                                    (rename(fname, oldfname) != 0)) {
 361                                         warn("rename()");
 362                                         if (*tmpfname)
 363                                                 unlink(tmpfname);
 364                                         exit(1);
 365                                 }
 366                                 *oldfname = '\0';
 367                         }
 368                         if (*tmpfname != '\0') {
 369                                 if (outfile != NULL && outfile != stdout)
 370                                         if (fclose(outfile) != 0) {
 371                                                 warn("fclose()");
 372                                                 unlink(tmpfname);
 373                                                 exit(1);
 374                                         }
 375                                 outfile = NULL;
 376                                 if (rename(tmpfname, fname) != 0) {
 377                                         /* this should not happen really! */
 378                                         warn("rename()");
 379                                         unlink(tmpfname);
 380                                         exit(1);
 381                                 }
 382                                 *tmpfname = '\0';
 383                         }
 384                         outfname = NULL;
 385                 }
 386                 if (firstfile == 0)
 387                         files = files->next;
 388                 else
 389                         firstfile = 0;
 390                 if (files == NULL) {
 391                         sp->len = 0;
 392                         return (0);
 393                 }
 394                 fname = files->fname;
 395                 if (inplace != NULL) {
 396                         if (lstat(fname, &sb) != 0)
 397                                 err(1, "%s", fname);
 398                         if (!S_ISREG(sb.st_mode))
 399                                 errx(1, "%s: %s %s", fname,
 400                                     "in-place editing only",
 401                                     "works for regular files");
 402                         if (*inplace != '\0') {
 403                                 strlcpy(oldfname, fname,
 404                                     sizeof(oldfname));
 405                                 len = strlcat(oldfname, inplace,
 406                                     sizeof(oldfname));
 407                                 if (len > (ssize_t)sizeof(oldfname))
 408                                         errx(1, "%s: name too long", fname);
 409                         }
 410                         if ((dirbuf = strdup(fname)) == NULL ||
 411                             (basebuf = strdup(fname)) == NULL)
 412                                 err(1, "strdup");
 413                         len = snprintf(tmpfname, sizeof(tmpfname),
 414                             "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(),
 415                             basename(basebuf));
 416                         free(dirbuf);
 417                         free(basebuf);
 418                         if (len >= (ssize_t)sizeof(tmpfname))
 419                                 errx(1, "%s: name too long", fname);
 420                         unlink(tmpfname);
 421                         if (outfile != NULL && outfile != stdout)
 422                                 fclose(outfile);
 423                         if ((outfile = fopen(tmpfname, "w")) == NULL)
 424                                 err(1, "%s", fname);
 425                         fchown(fileno(outfile), sb.st_uid, sb.st_gid);
 426                         fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
 427                         outfname = tmpfname;
 428                         if (!ispan) {
 429                                 linenum = 0;
 430                                 resetstate();
 431                         }
 432                 } else {
 433                         outfile = stdout;
 434                         outfname = "stdout";
 435                 }
 436                 if ((infile = fopen(fname, "r")) == NULL) {
 437                         warn("%s", fname);
 438                         rval = 1;
 439                         continue;
 440                 }
 441         }
 442         /*
 443          * We are here only when infile is open and we still have something
 444          * to read from it.
 445          *
 446          * Use getline() so that we can handle essentially infinite input
 447          * data.  The p and plen are static so each invocation gives
 448          * getline() the same buffer which is expanded as needed.
 449          */
 450         len = getline(&p, &plen, infile);
 451         if (len == -1)
 452                 err(1, "%s", fname);
 453         if (len != 0 && p[len - 1] == '\n') {
 454                 sp->append_newline = 1;
 455                 len--;
 456         } else if (!lastline()) {
 457                 sp->append_newline = 1;
 458         } else {
 459                 sp->append_newline = 0;
 460         }
 461         cspace(sp, p, len, spflag);
 462
 463         linenum++;
 464
 465         return (1);
 466 }
 467
 468 /*
 469  * Add a compilation unit to the linked list
 470  */
 471 static void
 472 add_compunit(enum e_cut type, char *s)
 473 {
 474         struct s_compunit *cu;
 475
 476         if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
 477                 err(1, "malloc");
 478         cu->type = type;
 479         cu->s = s;
 480         cu->next = NULL;
 481         *cu_nextp = cu;
 482         cu_nextp = &cu->next;
 483 }
 484
 485 /*
 486  * Add a file to the linked list
 487  */
 488 static void
 489 add_file(char *s)
 490 {
 491         struct s_flist *fp;
 492
 493         if ((fp = malloc(sizeof(struct s_flist))) == NULL)
 494                 err(1, "malloc");
 495         fp->next = NULL;
 496         *fl_nextp = fp;
 497         fp->fname = s;
 498         fl_nextp = &fp->next;
 499 }
 500
 501 static int
 502 next_files_have_lines(void)
 503 {
 504         struct s_flist *file;
 505         FILE *file_fd;
 506         int ch;
 507
 508         file = files;
 509         while ((file = file->next) != NULL) {
 510                 if ((file_fd = fopen(file->fname, "r")) == NULL)
 511                         continue;
 512
 513                 if ((ch = getc(file_fd)) != EOF) {
 514                         /*
 515                          * This next file has content, therefore current
 516                          * file doesn't contains the last line.
 517                          */
 518                         ungetc(ch, file_fd);
 519                         fclose(file_fd);
 520                         return (1);
 521                 }
 522
 523                 fclose(file_fd);
 524         }
 525
 526         return (0);
 527 }
 528
 529 int
 530 lastline(void)
 531 {
 532         int ch;
 533
 534         if (feof(infile)) {
 535                 return !(
 536                     (inplace == NULL || ispan) &&
 537                     next_files_have_lines());
 538         }
 539         if ((ch = getc(infile)) == EOF) {
 540                 return !(
 541                     (inplace == NULL || ispan) &&
 542                     next_files_have_lines());
 543         }
 544         ungetc(ch, infile);
 545         return (0);
 546 }