usr.bin/sed/main.c

   1 /*-
   2  * Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson.
   3  * Copyright (c) 1992 Diomidis Spinellis.
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Diomidis Spinellis of Imperial College, University of London.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  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 static int rval;                /* Exit status */
 104
 105 static int ispan;               /* Whether inplace editing spans across files */
 106
 107 /*
 108  * Current file and line number; line numbers restart across compilation
 109  * units, but span across input files.  The latter is optional if editing
 110  * in place.
 111  */
 112 const char *fname;              /* File name. */
 113 const char *outfname;           /* Output file name */
 114 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
 115 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
 116 static const char *inplace;     /* Inplace edit file extension. */
 117 u_long linenum;
 118
 119 static void add_compunit(enum e_cut, char *);
 120 static void add_file(char *);
 121 static void usage(void);
 122
 123 int
 124 main(int argc, char *argv[])
 125 {
 126         int c, fflag;
 127         char *temp_arg;
 128
 129         (void) setlocale(LC_ALL, "");
 130
 131         fflag = 0;
 132         inplace = NULL;
 133
 134         while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1)
 135                 switch (c) {
 136                 case 'r':               /* Gnu sed compat */
 137                 case 'E':
 138                         rflags = REG_EXTENDED;
 139                         break;
 140                 case 'I':
 141                         inplace = optarg;
 142                         ispan = 1;      /* span across input files */
 143                         break;
 144                 case 'a':
 145                         aflag = 1;
 146                         break;
 147                 case 'e':
 148                         eflag = 1;
 149                         if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
 150                                 err(1, "malloc");
 151                         strcpy(temp_arg, optarg);
 152                         strcat(temp_arg, "\n");
 153                         add_compunit(CU_STRING, temp_arg);
 154                         break;
 155                 case 'f':
 156                         fflag = 1;
 157                         add_compunit(CU_FILE, optarg);
 158                         break;
 159                 case 'i':
 160                         inplace = optarg;
 161                         ispan = 0;      /* don't span across input files */
 162                         break;
 163                 case 'l':
 164                         if(setvbuf(stdout, NULL, _IOLBF, 0) != 0)
 165                                 warnx("setting line buffered output failed");
 166                         break;
 167                 case 'n':
 168                         nflag = 1;
 169                         break;
 170                 case 'u':
 171                         if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
 172                                 warnx("setting unbuffered output failed");
 173                         break;
 174                 default:
 175                 case '?':
 176                         usage();
 177                 }
 178         argc -= optind;
 179         argv += optind;
 180
 181         /* First usage case; script is the first arg */
 182         if (!eflag && !fflag && *argv) {
 183                 add_compunit(CU_STRING, *argv);
 184                 argv++;
 185         }
 186
 187         compile();
 188
 189         /* Continue with first and start second usage */
 190         if (*argv)
 191                 for (; *argv; argv++)
 192                         add_file(*argv);
 193         else
 194                 add_file(NULL);
 195         process();
 196         cfclose(prog, NULL);
 197         if (fclose(stdout))
 198                 err(1, "stdout");
 199         exit(rval);
 200 }
 201
 202 static void
 203 usage(void)
 204 {
 205         (void)fprintf(stderr,
 206             "usage: %s script [-Ealnru] [-i extension] [file ...]\n"
 207             "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
 208             " ... [file ...]\n", getprogname(), getprogname());
 209         exit(1);
 210 }
 211
 212 /*
 213  * Like fgets, but go through the chain of compilation units chaining them
 214  * together.  Empty strings and files are ignored.
 215  */
 216 char *
 217 cu_fgets(char *buf, int n, int *more)
 218 {
 219         static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
 220         static FILE *f;         /* Current open file */
 221         static char *s;         /* Current pointer inside string */
 222         static char string_ident[30];
 223         char *p;
 224
 225 again:
 226         switch (state) {
 227         case ST_EOF:
 228                 if (script == NULL) {
 229                         if (more != NULL)
 230                                 *more = 0;
 231                         return (NULL);
 232                 }
 233                 linenum = 0;
 234                 switch (script->type) {
 235                 case CU_FILE:
 236                         if ((f = fopen(script->s, "r")) == NULL)
 237                                 err(1, "%s", script->s);
 238                         fname = script->s;
 239                         state = ST_FILE;
 240                         goto again;
 241                 case CU_STRING:
 242                         if (((size_t)snprintf(string_ident,
 243                             sizeof(string_ident), "\"%s\"", script->s)) >=
 244                             sizeof(string_ident) - 1)
 245                                 (void)strcpy(string_ident +
 246                                     sizeof(string_ident) - 6, " ...\"");
 247                         fname = string_ident;
 248                         s = script->s;
 249                         state = ST_STRING;
 250                         goto again;
 251                 }
 252         case ST_FILE:
 253                 if ((p = fgets(buf, n, f)) != NULL) {
 254                         linenum++;
 255                         if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
 256                                 nflag = 1;
 257                         if (more != NULL)
 258                                 *more = !feof(f);
 259                         return (p);
 260                 }
 261                 script = script->next;
 262                 (void)fclose(f);
 263                 state = ST_EOF;
 264                 goto again;
 265         case ST_STRING:
 266                 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
 267                         nflag = 1;
 268                 p = buf;
 269                 for (;;) {
 270                         if (n-- <= 1) {
 271                                 *p = '\0';
 272                                 linenum++;
 273                                 if (more != NULL)
 274                                         *more = 1;
 275                                 return (buf);
 276                         }
 277                         switch (*s) {
 278                         case '\0':
 279                                 state = ST_EOF;
 280                                 if (s == script->s) {
 281                                         script = script->next;
 282                                         goto again;
 283                                 } else {
 284                                         script = script->next;
 285                                         *p = '\0';
 286                                         linenum++;
 287                                         if (more != NULL)
 288                                                 *more = 0;
 289                                         return (buf);
 290                                 }
 291                         case '\n':
 292                                 *p++ = '\n';
 293                                 *p = '\0';
 294                                 s++;
 295                                 linenum++;
 296                                 if (more != NULL)
 297                                         *more = 0;
 298                                 return (buf);
 299                         default:
 300                                 *p++ = *s++;
 301                         }
 302                 }
 303         }
 304         /* NOTREACHED */
 305         return (NULL);
 306 }
 307
 308 /*
 309  * Like fgets, but go through the list of files chaining them together.
 310  * Set len to the length of the line.
 311  */
 312 int
 313 mf_fgets(SPACE *sp, enum e_spflag spflag)
 314 {
 315         struct stat sb;
 316         ssize_t len;
 317         char *dirbuf, *basebuf;
 318         static char *p = NULL;
 319         static size_t plen = 0;
 320         int c;
 321         static int firstfile;
 322
 323         if (infile == NULL) {
 324                 /* stdin? */
 325                 if (files->fname == NULL) {
 326                         if (inplace != NULL)
 327                                 errx(1, "-I or -i may not be used with stdin");
 328                         infile = stdin;
 329                         fname = "stdin";
 330                         outfile = stdout;
 331                         outfname = "stdout";
 332                 }
 333                 firstfile = 1;
 334         }
 335
 336         for (;;) {
 337                 if (infile != NULL && (c = getc(infile)) != EOF) {
 338                         (void)ungetc(c, infile);
 339                         break;
 340                 }
 341                 /* If we are here then either eof or no files are open yet */
 342                 if (infile == stdin) {
 343                         sp->len = 0;
 344                         return (0);
 345                 }
 346                 if (infile != NULL) {
 347                         fclose(infile);
 348                         if (*oldfname != '\0') {
 349                                 /* if there was a backup file, remove it */
 350                                 unlink(oldfname);
 351                                 /*
 352                                  * Backup the original.  Note that hard links
 353                                  * are not supported on all filesystems.
 354                                  */
 355                                 if ((link(fname, oldfname) != 0) &&
 356                                    (rename(fname, oldfname) != 0)) {
 357                                         warn("rename()");
 358                                         if (*tmpfname)
 359                                                 unlink(tmpfname);
 360                                         exit(1);
 361                                 }
 362                                 *oldfname = '\0';
 363                         }
 364                         if (*tmpfname != '\0') {
 365                                 if (outfile != NULL && outfile != stdout)
 366                                         if (fclose(outfile) != 0) {
 367                                                 warn("fclose()");
 368                                                 unlink(tmpfname);
 369                                                 exit(1);
 370                                         }
 371                                 outfile = NULL;
 372                                 if (rename(tmpfname, fname) != 0) {
 373                                         /* this should not happen really! */
 374                                         warn("rename()");
 375                                         unlink(tmpfname);
 376                                         exit(1);
 377                                 }
 378                                 *tmpfname = '\0';
 379                         }
 380                         outfname = NULL;
 381                 }
 382                 if (firstfile == 0)
 383                         files = files->next;
 384                 else
 385                         firstfile = 0;
 386                 if (files == NULL) {
 387                         sp->len = 0;
 388                         return (0);
 389                 }
 390                 fname = files->fname;
 391                 if (inplace != NULL) {
 392                         if (lstat(fname, &sb) != 0)
 393                                 err(1, "%s", fname);
 394                         if (!S_ISREG(sb.st_mode))
 395                                 errx(1, "%s: %s %s", fname,
 396                                     "in-place editing only",
 397                                     "works for regular files");
 398                         if (*inplace != '\0') {
 399                                 strlcpy(oldfname, fname,
 400                                     sizeof(oldfname));
 401                                 len = strlcat(oldfname, inplace,
 402                                     sizeof(oldfname));
 403                                 if (len > (ssize_t)sizeof(oldfname))
 404                                         errx(1, "%s: name too long", fname);
 405                         }
 406                         if ((dirbuf = strdup(fname)) == NULL ||
 407                             (basebuf = strdup(fname)) == NULL)
 408                                 err(1, "strdup");
 409                         len = snprintf(tmpfname, sizeof(tmpfname),
 410                             "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(),
 411                             basename(basebuf));
 412                         free(dirbuf);
 413                         free(basebuf);
 414                         if (len >= (ssize_t)sizeof(tmpfname))
 415                                 errx(1, "%s: name too long", fname);
 416                         unlink(tmpfname);
 417                         if (outfile != NULL && outfile != stdout)
 418                                 fclose(outfile);
 419                         if ((outfile = fopen(tmpfname, "w")) == NULL)
 420                                 err(1, "%s", fname);
 421                         fchown(fileno(outfile), sb.st_uid, sb.st_gid);
 422                         fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
 423                         outfname = tmpfname;
 424                         if (!ispan) {
 425                                 linenum = 0;
 426                                 resetstate();
 427                         }
 428                 } else {
 429                         outfile = stdout;
 430                         outfname = "stdout";
 431                 }
 432                 if ((infile = fopen(fname, "r")) == NULL) {
 433                         warn("%s", fname);
 434                         rval = 1;
 435                         continue;
 436                 }
 437         }
 438         /*
 439          * We are here only when infile is open and we still have something
 440          * to read from it.
 441          *
 442          * Use getline() so that we can handle essentially infinite input
 443          * data.  The p and plen are static so each invocation gives
 444          * getline() the same buffer which is expanded as needed.
 445          */
 446         len = getline(&p, &plen, infile);
 447         if (len == -1)
 448                 err(1, "%s", fname);
 449         if (len != 0 && p[len - 1] == '\n') {
 450                 sp->append_newline = 1;
 451                 len--;
 452         } else if (!lastline()) {
 453                 sp->append_newline = 1;
 454         } else {
 455                 sp->append_newline = 0;
 456         }
 457         cspace(sp, p, len, spflag);
 458
 459         linenum++;
 460
 461         return (1);
 462 }
 463
 464 /*
 465  * Add a compilation unit to the linked list
 466  */
 467 static void
 468 add_compunit(enum e_cut type, char *s)
 469 {
 470         struct s_compunit *cu;
 471
 472         if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
 473                 err(1, "malloc");
 474         cu->type = type;
 475         cu->s = s;
 476         cu->next = NULL;
 477         *cu_nextp = cu;
 478         cu_nextp = &cu->next;
 479 }
 480
 481 /*
 482  * Add a file to the linked list
 483  */
 484 static void
 485 add_file(char *s)
 486 {
 487         struct s_flist *fp;
 488
 489         if ((fp = malloc(sizeof(struct s_flist))) == NULL)
 490                 err(1, "malloc");
 491         fp->next = NULL;
 492         *fl_nextp = fp;
 493         fp->fname = s;
 494         fl_nextp = &fp->next;
 495 }
 496
 497 static int
 498 next_files_have_lines(void)
 499 {
 500         struct s_flist *file;
 501         FILE *file_fd;
 502         int ch;
 503
 504         file = files;
 505         while ((file = file->next) != NULL) {
 506                 if ((file_fd = fopen(file->fname, "r")) == NULL)
 507                         continue;
 508
 509                 if ((ch = getc(file_fd)) != EOF) {
 510                         /*
 511                          * This next file has content, therefore current
 512                          * file doesn't contains the last line.
 513                          */
 514                         ungetc(ch, file_fd);
 515                         fclose(file_fd);
 516                         return (1);
 517                 }
 518
 519                 fclose(file_fd);
 520         }
 521
 522         return (0);
 523 }
 524
 525 int
 526 lastline(void)
 527 {
 528         int ch;
 529
 530         if (feof(infile)) {
 531                 return !(
 532                     (inplace == NULL || ispan) &&
 533                     next_files_have_lines());
 534         }
 535         if ((ch = getc(infile)) == EOF) {
 536                 return !(
 537                     (inplace == NULL || ispan) &&
 538                     next_files_have_lines());
 539         }
 540         ungetc(ch, infile);
 541         return (0);
 542 }