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  * @(#) Copyright (c) 1992, 1993 The Regents of the University of California.  All rights reserved.
  35  * @(#)main.c   8.2 (Berkeley) 1/3/94
  36  * $FreeBSD: src/usr.bin/sed/main.c,v 1.41 2008/02/09 09:12:02 dwmalone Exp $
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/mman.h>
  41 #include <sys/param.h>
  42 #include <sys/stat.h>
  43
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <libgen.h>
  48 #include <limits.h>
  49 #include <locale.h>
  50 #include <stddef.h>
  51 #define _WITH_GETLINE
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <unistd.h>
  56 #include <regex.h>
  57
  58 #include "defs.h"
  59 #include "extern.h"
  60
  61 /*
  62  * Linked list of units (strings and files) to be compiled
  63  */
  64 struct s_compunit {
  65         struct s_compunit *next;
  66         enum e_cut {CU_FILE, CU_STRING} type;
  67         char *s;                        /* Pointer to string or fname */
  68 };
  69
  70 /*
  71  * Linked list pointer to compilation units and pointer to current
  72  * next pointer.
  73  */
  74 static struct s_compunit *script, **cu_nextp = &script;
  75
  76 /*
  77  * Linked list of files to be processed
  78  */
  79 struct s_flist {
  80         char *fname;
  81         struct s_flist *next;
  82 };
  83
  84 /*
  85  * Linked list pointer to files and pointer to current
  86  * next pointer.
  87  */
  88 static struct s_flist *files, **fl_nextp = &files;
  89
  90 FILE *infile;                   /* Current input file */
  91 FILE *outfile;                  /* Current output file */
  92
  93 int aflag, eflag, nflag;
  94 int rflags = 0;
  95 static int rval;                /* Exit status */
  96
  97 static int ispan;               /* Whether inplace editing spans across files */
  98
  99 /*
 100  * Current file and line number; line numbers restart across compilation
 101  * units, but span across input files.  The latter is optional if editing
 102  * in place.
 103  */
 104 const char *fname;              /* File name. */
 105 const char *outfname;           /* Output file name */
 106 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
 107 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
 108 static const char *inplace;     /* Inplace edit file extension. */
 109 u_long linenum;
 110
 111 static void add_compunit(enum e_cut, char *);
 112 static void add_file(char *);
 113 static void usage(void);
 114
 115 int
 116 main(int argc, char *argv[])
 117 {
 118         int c, fflag;
 119         char *temp_arg;
 120
 121         (void) setlocale(LC_ALL, "");
 122
 123         fflag = 0;
 124         inplace = NULL;
 125
 126         while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1)
 127                 switch (c) {
 128                 case 'r':               /* GNU sed compat */
 129                 case 'E':
 130                         rflags = REG_EXTENDED;
 131                         break;
 132                 case 'I':
 133                         inplace = optarg;
 134                         ispan = 1;      /* span across input files */
 135                         break;
 136                 case 'a':
 137                         aflag = 1;
 138                         break;
 139                 case 'e':
 140                         eflag = 1;
 141                         if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
 142                                 err(1, "malloc");
 143                         strcpy(temp_arg, optarg);
 144                         strcat(temp_arg, "\n");
 145                         add_compunit(CU_STRING, temp_arg);
 146                         break;
 147                 case 'f':
 148                         fflag = 1;
 149                         add_compunit(CU_FILE, optarg);
 150                         break;
 151                 case 'i':
 152                         inplace = optarg;
 153                         ispan = 0;      /* don't span across input files */
 154                         break;
 155                 case 'l':
 156                         if(setvbuf(stdout, NULL, _IOLBF, 0) != 0)
 157                                 warnx("setting line buffered output failed");
 158                         break;
 159                 case 'n':
 160                         nflag = 1;
 161                         break;
 162                 case 'u':
 163                         if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
 164                                 warnx("setting unbuffered output failed");
 165                         break;
 166                 default:
 167                 case '?':
 168                         usage();
 169                 }
 170         argc -= optind;
 171         argv += optind;
 172
 173         /* First usage case; script is the first arg */
 174         if (!eflag && !fflag && *argv) {
 175                 add_compunit(CU_STRING, *argv);
 176                 argv++;
 177         }
 178
 179         compile();
 180
 181         /* Continue with first and start second usage */
 182         if (*argv)
 183                 for (; *argv; argv++)
 184                         add_file(*argv);
 185         else
 186                 add_file(NULL);
 187         process();
 188         cfclose(prog, NULL);
 189         if (fclose(stdout))
 190                 err(1, "stdout");
 191         exit(rval);
 192 }
 193
 194 static void
 195 usage(void)
 196 {
 197         (void)fprintf(stderr,
 198             "usage: %s script [-Ealnru] [-i extension] [file ...]\n"
 199             "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
 200             " ... [file ...]\n", getprogname(), getprogname());
 201         exit(1);
 202 }
 203
 204 /*
 205  * Like fgets, but go through the chain of compilation units chaining them
 206  * together.  Empty strings and files are ignored.
 207  */
 208 char *
 209 cu_fgets(char *buf, int n, int *more)
 210 {
 211         static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
 212         static FILE *f;         /* Current open file */
 213         static char *s;         /* Current pointer inside string */
 214         static char string_ident[30];
 215         char *p;
 216
 217 again:
 218         switch (state) {
 219         case ST_EOF:
 220                 if (script == NULL) {
 221                         if (more != NULL)
 222                                 *more = 0;
 223                         return (NULL);
 224                 }
 225                 linenum = 0;
 226                 switch (script->type) {
 227                 case CU_FILE:
 228                         if ((f = fopen(script->s, "r")) == NULL)
 229                                 err(1, "%s", script->s);
 230                         fname = script->s;
 231                         state = ST_FILE;
 232                         goto again;
 233                 case CU_STRING:
 234                         if (((size_t)snprintf(string_ident,
 235                             sizeof(string_ident), "\"%s\"", script->s)) >=
 236                             sizeof(string_ident) - 1)
 237                                 (void)strcpy(string_ident +
 238                                     sizeof(string_ident) - 6, " ...\"");
 239                         fname = string_ident;
 240                         s = script->s;
 241                         state = ST_STRING;
 242                         goto again;
 243                 }
 244         case ST_FILE:
 245                 if ((p = fgets(buf, n, f)) != NULL) {
 246                         linenum++;
 247                         if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
 248                                 nflag = 1;
 249                         if (more != NULL)
 250                                 *more = !feof(f);
 251                         return (p);
 252                 }
 253                 script = script->next;
 254                 (void)fclose(f);
 255                 state = ST_EOF;
 256                 goto again;
 257         case ST_STRING:
 258                 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
 259                         nflag = 1;
 260                 p = buf;
 261                 for (;;) {
 262                         if (n-- <= 1) {
 263                                 *p = '\0';
 264                                 linenum++;
 265                                 if (more != NULL)
 266                                         *more = 1;
 267                                 return (buf);
 268                         }
 269                         switch (*s) {
 270                         case '\0':
 271                                 state = ST_EOF;
 272                                 if (s == script->s) {
 273                                         script = script->next;
 274                                         goto again;
 275                                 } else {
 276                                         script = script->next;
 277                                         *p = '\0';
 278                                         linenum++;
 279                                         if (more != NULL)
 280                                                 *more = 0;
 281                                         return (buf);
 282                                 }
 283                         case '\n':
 284                                 *p++ = '\n';
 285                                 *p = '\0';
 286                                 s++;
 287                                 linenum++;
 288                                 if (more != NULL)
 289                                         *more = 0;
 290                                 return (buf);
 291                         default:
 292                                 *p++ = *s++;
 293                         }
 294                 }
 295         }
 296         /* NOTREACHED */
 297         return (NULL);
 298 }
 299
 300 /*
 301  * Like fgets, but go through the list of files chaining them together.
 302  * Set len to the length of the line.
 303  */
 304 int
 305 mf_fgets(SPACE *sp, enum e_spflag spflag)
 306 {
 307         struct stat sb;
 308         ssize_t len;
 309         static char *p = NULL;
 310         static size_t plen = 0;
 311         int c;
 312         static int firstfile;
 313
 314         if (infile == NULL) {
 315                 /* stdin? */
 316                 if (files->fname == NULL) {
 317                         if (inplace != NULL)
 318                                 errx(1, "-I or -i may not be used with stdin");
 319                         infile = stdin;
 320                         fname = "stdin";
 321                         outfile = stdout;
 322                         outfname = "stdout";
 323                 }
 324                 firstfile = 1;
 325         }
 326
 327         for (;;) {
 328                 if (infile != NULL && (c = getc(infile)) != EOF) {
 329                         (void)ungetc(c, infile);
 330                         break;
 331                 }
 332                 /* If we are here then either eof or no files are open yet */
 333                 if (infile == stdin) {
 334                         sp->len = 0;
 335                         return (0);
 336                 }
 337                 if (infile != NULL) {
 338                         fclose(infile);
 339                         if (*oldfname != '\0') {
 340                                 /* if there was a backup file, remove it */
 341                                 unlink(oldfname);
 342                                 /*
 343                                  * Backup the original.  Note that hard links
 344                                  * are not supported on all filesystems.
 345                                  */
 346                                 if ((link(fname, oldfname) != 0) &&
 347                                    (rename(fname, oldfname) != 0)) {
 348                                         warn("rename()");
 349                                         if (*tmpfname)
 350                                                 unlink(tmpfname);
 351                                         exit(1);
 352                                 }
 353                                 *oldfname = '\0';
 354                         }
 355                         if (*tmpfname != '\0') {
 356                                 if (outfile != NULL && outfile != stdout)
 357                                         if (fclose(outfile) != 0) {
 358                                                 warn("fclose()");
 359                                                 unlink(tmpfname);
 360                                                 exit(1);
 361                                         }
 362                                 outfile = NULL;
 363                                 if (rename(tmpfname, fname) != 0) {
 364                                         /* this should not happen really! */
 365                                         warn("rename()");
 366                                         unlink(tmpfname);
 367                                         exit(1);
 368                                 }
 369                                 *tmpfname = '\0';
 370                         }
 371                         outfname = NULL;
 372                 }
 373                 if (firstfile == 0)
 374                         files = files->next;
 375                 else
 376                         firstfile = 0;
 377                 if (files == NULL) {
 378                         sp->len = 0;
 379                         return (0);
 380                 }
 381                 fname = files->fname;
 382                 if (inplace != NULL) {
 383                         if (lstat(fname, &sb) != 0)
 384                                 err(1, "%s", fname);
 385                         if (!(sb.st_mode & S_IFREG))
 386                                 errx(1, "%s: %s %s", fname,
 387                                     "in-place editing only",
 388                                     "works for regular files");
 389                         if (*inplace != '\0') {
 390                                 strlcpy(oldfname, fname,
 391                                     sizeof(oldfname));
 392                                 len = strlcat(oldfname, inplace,
 393                                     sizeof(oldfname));
 394                                 if (len > (ssize_t)sizeof(oldfname))
 395                                         errx(1, "%s: name too long", fname);
 396                         }
 397                         len = snprintf(tmpfname, sizeof(tmpfname),
 398                             "%s/.!%ld!%s", dirname(fname), (long)getpid(),
 399                             basename(fname));
 400                         if (len >= (ssize_t)sizeof(tmpfname))
 401                                 errx(1, "%s: name too long", fname);
 402                         unlink(tmpfname);
 403                         if ((outfile = fopen(tmpfname, "w")) == NULL)
 404                                 err(1, "%s", fname);
 405                         fchown(fileno(outfile), sb.st_uid, sb.st_gid);
 406                         fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
 407                         outfname = tmpfname;
 408                         if (!ispan) {
 409                                 linenum = 0;
 410                                 resetstate();
 411                         }
 412                 } else {
 413                         outfile = stdout;
 414                         outfname = "stdout";
 415                 }
 416                 if ((infile = fopen(fname, "r")) == NULL) {
 417                         warn("%s", fname);
 418                         rval = 1;
 419                         continue;
 420                 }
 421         }
 422         /*
 423          * We are here only when infile is open and we still have something
 424          * to read from it.
 425          *
 426          * Use getline() so that we can handle essentially infinite input
 427          * data.  The p and plen are static so each invocation gives
 428          * getline() the same buffer which is expanded as needed.
 429          */
 430         len = getline(&p, &plen, infile);
 431         if (len == -1)
 432                 err(1, "%s", fname);
 433         if (len != 0 && p[len - 1] == '\n') {
 434                 sp->append_newline = 1;
 435                 len--;
 436         } else if (!lastline()) {
 437                 sp->append_newline = 1;
 438         } else {
 439                 sp->append_newline = 0;
 440         }
 441         cspace(sp, p, len, spflag);
 442
 443         linenum++;
 444
 445         return (1);
 446 }
 447
 448 /*
 449  * Add a compilation unit to the linked list
 450  */
 451 static void
 452 add_compunit(enum e_cut type, char *s)
 453 {
 454         struct s_compunit *cu;
 455
 456         if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
 457                 err(1, "malloc");
 458         cu->type = type;
 459         cu->s = s;
 460         cu->next = NULL;
 461         *cu_nextp = cu;
 462         cu_nextp = &cu->next;
 463 }
 464
 465 /*
 466  * Add a file to the linked list
 467  */
 468 static void
 469 add_file(char *s)
 470 {
 471         struct s_flist *fp;
 472
 473         if ((fp = malloc(sizeof(struct s_flist))) == NULL)
 474                 err(1, "malloc");
 475         fp->next = NULL;
 476         *fl_nextp = fp;
 477         fp->fname = s;
 478         fl_nextp = &fp->next;
 479 }
 480
 481 static int
 482 next_files_have_lines(void)
 483 {
 484         struct s_flist *file;
 485         FILE *file_fd;
 486         int ch;
 487
 488         file = files;
 489         while ((file = file->next) != NULL) {
 490                 if ((file_fd = fopen(file->fname, "r")) == NULL)
 491                         continue;
 492
 493                 if ((ch = getc(file_fd)) != EOF) {
 494                         /*
 495                          * This next file has content, therefore current
 496                          * file doesn't contains the last line.
 497                          */
 498                         ungetc(ch, file_fd);
 499                         fclose(file_fd);
 500                         return (1);
 501                 }
 502
 503                 fclose(file_fd);
 504         }
 505
 506         return (0);
 507 }
 508
 509 int
 510 lastline(void)
 511 {
 512         int ch;
 513
 514         if (feof(infile)) {
 515                 return !(
 516                     (inplace == NULL || ispan) &&
 517                     next_files_have_lines());
 518         }
 519         if ((ch = getc(infile)) == EOF) {
 520                 return !(
 521                     (inplace == NULL || ispan) &&
 522                     next_files_have_lines());
 523         }
 524         ungetc(ch, infile);
 525         return (0);
 526 }