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