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 int quit = 0;
 106 static int rval;                /* Exit status */
 107
 108 static int ispan;               /* Whether inplace editing spans across files */
 109
 110 /*
 111  * Current file and line number; line numbers restart across compilation
 112  * units, but span across input files.  The latter is optional if editing
 113  * in place.
 114  */
 115 const char *fname;              /* File name. */
 116 const char *outfname;           /* Output file name */
 117 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
 118 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
 119 const char *inplace;            /* Inplace edit file extension. */
 120 u_long linenum;
 121
 122 static void add_compunit(enum e_cut, char *);
 123 static void add_file(char *);
 124 static void usage(void);
 125
 126 int
 127 main(int argc, char *argv[])
 128 {
 129         int c, fflag, fflagstdin;
 130         char *temp_arg;
 131
 132         (void) setlocale(LC_ALL, "");
 133
 134         fflag = 0;
 135         fflagstdin = 0;
 136         inplace = NULL;
 137
 138         while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1)
 139                 switch (c) {
 140                 case 'r':               /* Gnu sed compat */
 141                 case 'E':
 142                         rflags = REG_EXTENDED;
 143                         break;
 144                 case 'I':
 145                         inplace = optarg;
 146                         ispan = 1;      /* span across input files */
 147                         break;
 148                 case 'a':
 149                         aflag = 1;
 150                         break;
 151                 case 'e':
 152                         eflag = 1;
 153                         if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
 154                                 err(1, "malloc");
 155                         strcpy(temp_arg, optarg);
 156                         strcat(temp_arg, "\n");
 157                         add_compunit(CU_STRING, temp_arg);
 158                         break;
 159                 case 'f':
 160                         fflag = 1;
 161                         if (strcmp(optarg, "-") == 0)
 162                                 fflagstdin = 1;
 163                         add_compunit(CU_FILE, optarg);
 164                         break;
 165                 case 'i':
 166                         inplace = optarg;
 167                         ispan = 0;      /* don't span across input files */
 168                         break;
 169                 case 'l':
 170                         if(setvbuf(stdout, NULL, _IOLBF, 0) != 0)
 171                                 warnx("setting line buffered output failed");
 172                         break;
 173                 case 'n':
 174                         nflag = 1;
 175                         break;
 176                 case 'u':
 177                         if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
 178                                 warnx("setting unbuffered output failed");
 179                         break;
 180                 default:
 181                 case '?':
 182                         usage();
 183                 }
 184         argc -= optind;
 185         argv += optind;
 186
 187         /* First usage case; script is the first arg */
 188         if (!eflag && !fflag && *argv) {
 189                 add_compunit(CU_STRING, *argv);
 190                 argv++;
 191         }
 192
 193         compile();
 194
 195         /* Continue with first and start second usage */
 196         if (*argv)
 197                 for (; *argv; argv++)
 198                         add_file(*argv);
 199         else if (fflagstdin)
 200                 exit(rval);
 201         else
 202                 add_file(NULL);
 203         process();
 204         cfclose(prog, NULL);
 205         if (fclose(stdout))
 206                 err(1, "stdout");
 207         exit(rval);
 208 }
 209
 210 static void
 211 usage(void)
 212 {
 213         (void)fprintf(stderr,
 214             "usage: %s script [-Ealnru] [-i extension] [file ...]\n"
 215             "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
 216             " ... [file ...]\n", getprogname(), getprogname());
 217         exit(1);
 218 }
 219
 220 /*
 221  * Like fgets, but go through the chain of compilation units chaining them
 222  * together.  Empty strings and files are ignored.
 223  */
 224 char *
 225 cu_fgets(char *buf, int n, int *more)
 226 {
 227         static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
 228         static FILE *f;         /* Current open file */
 229         static char *s;         /* Current pointer inside string */
 230         static char string_ident[30];
 231         char *p;
 232
 233 again:
 234         switch (state) {
 235         case ST_EOF:
 236                 if (script == NULL) {
 237                         if (more != NULL)
 238                                 *more = 0;
 239                         return (NULL);
 240                 }
 241                 linenum = 0;
 242                 switch (script->type) {
 243                 case CU_FILE:
 244                         if (strcmp(script->s, "-") == 0) {
 245                                 f = stdin;
 246                                 fname = "stdin";
 247                         } else {
 248                                 if ((f = fopen(script->s, "r")) == NULL)
 249                                         err(1, "%s", script->s);
 250                                 fname = script->s;
 251                         }
 252                         state = ST_FILE;
 253                         goto again;
 254                 case CU_STRING:
 255                         if (((size_t)snprintf(string_ident,
 256                             sizeof(string_ident), "\"%s\"", script->s)) >=
 257                             sizeof(string_ident) - 1)
 258                                 (void)strcpy(string_ident +
 259                                     sizeof(string_ident) - 6, " ...\"");
 260                         fname = string_ident;
 261                         s = script->s;
 262                         state = ST_STRING;
 263                         goto again;
 264                 default:
 265                         __unreachable();
 266                 }
 267         case ST_FILE:
 268                 if ((p = fgets(buf, n, f)) != NULL) {
 269                         linenum++;
 270                         if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
 271                                 nflag = 1;
 272                         if (more != NULL)
 273                                 *more = !feof(f);
 274                         return (p);
 275                 }
 276                 script = script->next;
 277                 (void)fclose(f);
 278                 state = ST_EOF;
 279                 goto again;
 280         case ST_STRING:
 281                 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
 282                         nflag = 1;
 283                 p = buf;
 284                 for (;;) {
 285                         if (n-- <= 1) {
 286                                 *p = '\0';
 287                                 linenum++;
 288                                 if (more != NULL)
 289                                         *more = 1;
 290                                 return (buf);
 291                         }
 292                         switch (*s) {
 293                         case '\0':
 294                                 state = ST_EOF;
 295                                 if (s == script->s) {
 296                                         script = script->next;
 297                                         goto again;
 298                                 } else {
 299                                         script = script->next;
 300                                         *p = '\0';
 301                                         linenum++;
 302                                         if (more != NULL)
 303                                                 *more = 0;
 304                                         return (buf);
 305                                 }
 306                         case '\n':
 307                                 *p++ = '\n';
 308                                 *p = '\0';
 309                                 s++;
 310                                 linenum++;
 311                                 if (more != NULL)
 312                                         *more = 0;
 313                                 return (buf);
 314                         default:
 315                                 *p++ = *s++;
 316                         }
 317                 }
 318         }
 319         /* NOTREACHED */
 320         return (NULL);
 321 }
 322
 323 /*
 324  * Like fgets, but go through the list of files chaining them together.
 325  * Set len to the length of the line.
 326  */
 327 int
 328 mf_fgets(SPACE *sp, enum e_spflag spflag)
 329 {
 330         struct stat sb;
 331         ssize_t len;
 332         char *dirbuf, *basebuf;
 333         static char *p = NULL;
 334         static size_t plen = 0;
 335         int c;
 336         static int firstfile;
 337
 338         if (infile == NULL) {
 339                 /* stdin? */
 340                 if (files->fname == NULL) {
 341                         if (inplace != NULL)
 342                                 errx(1, "-I or -i may not be used with stdin");
 343                         infile = stdin;
 344                         fname = "stdin";
 345                         outfile = stdout;
 346                         outfname = "stdout";
 347                 }
 348                 firstfile = 1;
 349         }
 350
 351         for (;;) {
 352                 if (infile != NULL && (c = getc(infile)) != EOF && !quit) {
 353                         (void)ungetc(c, infile);
 354                         break;
 355                 }
 356                 /* If we are here then either eof or no files are open yet */
 357                 if (infile == stdin) {
 358                         sp->len = 0;
 359                         return (0);
 360                 }
 361                 if (infile != NULL) {
 362                         fclose(infile);
 363                         if (*oldfname != '\0') {
 364                                 /* if there was a backup file, remove it */
 365                                 unlink(oldfname);
 366                                 /*
 367                                  * Backup the original.  Note that hard links
 368                                  * are not supported on all filesystems.
 369                                  */
 370                                 if ((link(fname, oldfname) != 0) &&
 371                                    (rename(fname, oldfname) != 0)) {
 372                                         warn("rename()");
 373                                         if (*tmpfname)
 374                                                 unlink(tmpfname);
 375                                         exit(1);
 376                                 }
 377                                 *oldfname = '\0';
 378                         }
 379                         if (*tmpfname != '\0') {
 380                                 if (outfile != NULL && outfile != stdout)
 381                                         if (fclose(outfile) != 0) {
 382                                                 warn("fclose()");
 383                                                 unlink(tmpfname);
 384                                                 exit(1);
 385                                         }
 386                                 outfile = NULL;
 387                                 if (rename(tmpfname, fname) != 0) {
 388                                         /* this should not happen really! */
 389                                         warn("rename()");
 390                                         unlink(tmpfname);
 391                                         exit(1);
 392                                 }
 393                                 *tmpfname = '\0';
 394                         }
 395                         outfname = NULL;
 396                 }
 397                 if (firstfile == 0)
 398                         files = files->next;
 399                 else
 400                         firstfile = 0;
 401                 if (files == NULL) {
 402                         sp->len = 0;
 403                         return (0);
 404                 }
 405                 fname = files->fname;
 406                 if (inplace != NULL) {
 407                         if (lstat(fname, &sb) != 0)
 408                                 err(1, "%s", fname);
 409                         if (!S_ISREG(sb.st_mode))
 410                                 errx(1, "%s: %s %s", fname,
 411                                     "in-place editing only",
 412                                     "works for regular files");
 413                         if (*inplace != '\0') {
 414                                 strlcpy(oldfname, fname,
 415                                     sizeof(oldfname));
 416                                 len = strlcat(oldfname, inplace,
 417                                     sizeof(oldfname));
 418                                 if (len > (ssize_t)sizeof(oldfname))
 419                                         errx(1, "%s: name too long", fname);
 420                         }
 421                         if ((dirbuf = strdup(fname)) == NULL ||
 422                             (basebuf = strdup(fname)) == NULL)
 423                                 err(1, "strdup");
 424                         len = snprintf(tmpfname, sizeof(tmpfname),
 425                             "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(),
 426                             basename(basebuf));
 427                         free(dirbuf);
 428                         free(basebuf);
 429                         if (len >= (ssize_t)sizeof(tmpfname))
 430                                 errx(1, "%s: name too long", fname);
 431                         unlink(tmpfname);
 432                         if (outfile != NULL && outfile != stdout)
 433                                 fclose(outfile);
 434                         if ((outfile = fopen(tmpfname, "w")) == NULL)
 435                                 err(1, "%s", fname);
 436                         fchown(fileno(outfile), sb.st_uid, sb.st_gid);
 437                         fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
 438                         outfname = tmpfname;
 439                         if (!ispan) {
 440                                 linenum = 0;
 441                                 resetstate();
 442                         }
 443                 } else {
 444                         outfile = stdout;
 445                         outfname = "stdout";
 446                 }
 447                 if ((infile = fopen(fname, "r")) == NULL) {
 448                         warn("%s", fname);
 449                         rval = 1;
 450                         continue;
 451                 }
 452         }
 453         /*
 454          * We are here only when infile is open and we still have something
 455          * to read from it.
 456          *
 457          * Use getline() so that we can handle essentially infinite input
 458          * data.  The p and plen are static so each invocation gives
 459          * getline() the same buffer which is expanded as needed.
 460          */
 461         len = getline(&p, &plen, infile);
 462         if (len == -1)
 463                 err(1, "%s", fname);
 464         if (len != 0 && p[len - 1] == '\n') {
 465                 sp->append_newline = 1;
 466                 len--;
 467         } else if (!lastline()) {
 468                 sp->append_newline = 1;
 469         } else {
 470                 sp->append_newline = 0;
 471         }
 472         cspace(sp, p, len, spflag);
 473
 474         linenum++;
 475
 476         return (1);
 477 }
 478
 479 /*
 480  * Add a compilation unit to the linked list
 481  */
 482 static void
 483 add_compunit(enum e_cut type, char *s)
 484 {
 485         struct s_compunit *cu;
 486
 487         if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
 488                 err(1, "malloc");
 489         cu->type = type;
 490         cu->s = s;
 491         cu->next = NULL;
 492         *cu_nextp = cu;
 493         cu_nextp = &cu->next;
 494 }
 495
 496 /*
 497  * Add a file to the linked list
 498  */
 499 static void
 500 add_file(char *s)
 501 {
 502         struct s_flist *fp;
 503
 504         if ((fp = malloc(sizeof(struct s_flist))) == NULL)
 505                 err(1, "malloc");
 506         fp->next = NULL;
 507         *fl_nextp = fp;
 508         fp->fname = s;
 509         fl_nextp = &fp->next;
 510 }
 511
 512 static int
 513 next_files_have_lines(void)
 514 {
 515         struct s_flist *file;
 516         FILE *file_fd;
 517         int ch;
 518
 519         file = files;
 520         while ((file = file->next) != NULL) {
 521                 if ((file_fd = fopen(file->fname, "r")) == NULL)
 522                         continue;
 523
 524                 if ((ch = getc(file_fd)) != EOF) {
 525                         /*
 526                          * This next file has content, therefore current
 527                          * file doesn't contains the last line.
 528                          */
 529                         ungetc(ch, file_fd);
 530                         fclose(file_fd);
 531                         return (1);
 532                 }
 533
 534                 fclose(file_fd);
 535         }
 536
 537         return (0);
 538 }
 539
 540 int
 541 lastline(void)
 542 {
 543         int ch;
 544
 545         if (feof(infile)) {
 546                 return !(
 547                     (inplace == NULL || ispan) &&
 548                     next_files_have_lines());
 549         }
 550         if ((ch = getc(infile)) == EOF) {
 551                 return !(
 552                     (inplace == NULL || ispan) &&
 553                     next_files_have_lines());
 554         }
 555         ungetc(ch, infile);
 556         return (0);
 557 }