usr.bin/sed/main.c

   1 /*-
   2  * Copyright (c) 1992 Diomidis Spinellis.
   3  * Copyright (c) 1992, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Diomidis Spinellis of Imperial College, University of London.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #ifndef lint
  38 static const char copyright[] =
  39 "@(#) Copyright (c) 1992, 1993\n\
  40         The Regents of the University of California.  All rights reserved.\n";
  41 #endif
  42
  43 #ifndef lint
  44 static const char sccsid[] = "@(#)main.c        8.2 (Berkeley) 1/3/94";
  45 #endif
  46
  47 #include <sys/types.h>
  48 #include <sys/mman.h>
  49 #include <sys/param.h>
  50 #include <sys/stat.h>
  51
  52 #include <err.h>
  53 #include <errno.h>
  54 #include <fcntl.h>
  55 #include <libgen.h>
  56 #include <limits.h>
  57 #include <locale.h>
  58 #include <regex.h>
  59 #include <stddef.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64
  65 #include "defs.h"
  66 #include "extern.h"
  67
  68 /*
  69  * Linked list of units (strings and files) to be compiled
  70  */
  71 struct s_compunit {
  72         struct s_compunit *next;
  73         enum e_cut {CU_FILE, CU_STRING} type;
  74         char *s;                        /* Pointer to string or fname */
  75 };
  76
  77 /*
  78  * Linked list pointer to compilation units and pointer to current
  79  * next pointer.
  80  */
  81 static struct s_compunit *script, **cu_nextp = &script;
  82
  83 /*
  84  * Linked list of files to be processed
  85  */
  86 struct s_flist {
  87         char *fname;
  88         struct s_flist *next;
  89 };
  90
  91 /*
  92  * Linked list pointer to files and pointer to current
  93  * next pointer.
  94  */
  95 static struct s_flist *files, **fl_nextp = &files;
  96
  97 FILE *infile;                   /* Current input file */
  98 FILE *outfile;                  /* Current output file */
  99
 100 int aflag, eflag, nflag;
 101 int rflags = 0;
 102 static int rval;                /* Exit status */
 103
 104 static int ispan;               /* Whether inplace editing spans across files */
 105
 106 /*
 107  * Current file and line number; line numbers restart across compilation
 108  * units, but span across input files.  The latter is optional if editing
 109  * in place.
 110  */
 111 const char *fname;              /* File name. */
 112 const char *outfname;           /* Output file name */
 113 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
 114 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
 115 static const char *inplace;     /* Inplace edit file extension. */
 116 u_long linenum;
 117
 118 static void add_compunit(enum e_cut, char *);
 119 static void add_file(char *);
 120 static void usage(void);
 121
 122 int
 123 main(int argc, char *argv[])
 124 {
 125         int c, fflag;
 126         char *temp_arg;
 127
 128         (void) setlocale(LC_ALL, "");
 129
 130         fflag = 0;
 131         inplace = NULL;
 132
 133         while ((c = getopt(argc, argv, "EI:ae:f:i:lnr")) != -1)
 134                 switch (c) {
 135                 case 'r':               /* Gnu sed compat */
 136                 case 'E':
 137                         rflags = REG_EXTENDED;
 138                         break;
 139                 case 'I':
 140                         inplace = optarg;
 141                         ispan = 1;      /* span across input files */
 142                         break;
 143                 case 'a':
 144                         aflag = 1;
 145                         break;
 146                 case 'e':
 147                         eflag = 1;
 148                         if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
 149                                 err(1, "malloc");
 150                         strcpy(temp_arg, optarg);
 151                         strcat(temp_arg, "\n");
 152                         add_compunit(CU_STRING, temp_arg);
 153                         break;
 154                 case 'f':
 155                         fflag = 1;
 156                         add_compunit(CU_FILE, optarg);
 157                         break;
 158                 case 'i':
 159                         inplace = optarg;
 160                         ispan = 0;      /* don't span across input files */
 161                         break;
 162                 case 'l':
 163                         if(setlinebuf(stdout) != 0)
 164                                 warnx("setlinebuf() failed");
 165                         break;
 166                 case 'n':
 167                         nflag = 1;
 168                         break;
 169                 default:
 170                 case '?':
 171                         usage();
 172                 }
 173         argc -= optind;
 174         argv += optind;
 175
 176         /* First usage case; script is the first arg */
 177         if (!eflag && !fflag && *argv) {
 178                 add_compunit(CU_STRING, *argv);
 179                 argv++;
 180         }
 181
 182         compile();
 183
 184         /* Continue with first and start second usage */
 185         if (*argv)
 186                 for (; *argv; argv++)
 187                         add_file(*argv);
 188         else
 189                 add_file(NULL);
 190         process();
 191         cfclose(prog, NULL);
 192         if (fclose(stdout))
 193                 err(1, "stdout");
 194         exit(rval);
 195 }
 196
 197 static void
 198 usage(void)
 199 {
 200         (void)fprintf(stderr, "%s\n%s\n",
 201                 "usage: sed script [-Ealn] [-i extension] [file ...]",
 202                 "       sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file ...]");
 203         exit(1);
 204 }
 205
 206 /*
 207  * Like fgets, but go through the chain of compilation units chaining them
 208  * together.  Empty strings and files are ignored.
 209  */
 210 char *
 211 cu_fgets(char *buf, int n, int *more)
 212 {
 213         static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
 214         static FILE *f;         /* Current open file */
 215         static char *s;         /* Current pointer inside string */
 216         static char string_ident[30];
 217         char *p;
 218
 219 again:
 220         switch (state) {
 221         case ST_EOF:
 222                 if (script == NULL) {
 223                         if (more != NULL)
 224                                 *more = 0;
 225                         return (NULL);
 226                 }
 227                 linenum = 0;
 228                 switch (script->type) {
 229                 case CU_FILE:
 230                         if ((f = fopen(script->s, "r")) == NULL)
 231                                 err(1, "%s", script->s);
 232                         fname = script->s;
 233                         state = ST_FILE;
 234                         goto again;
 235                 case CU_STRING:
 236                         if (((size_t)snprintf(string_ident,
 237                             sizeof(string_ident), "\"%s\"", script->s)) >=
 238                             sizeof(string_ident) - 1)
 239                                 (void)strcpy(string_ident +
 240                                     sizeof(string_ident) - 6, " ...\"");
 241                         fname = string_ident;
 242                         s = script->s;
 243                         state = ST_STRING;
 244                         goto again;
 245                 }
 246         case ST_FILE:
 247                 if ((p = fgets(buf, n, f)) != NULL) {
 248                         linenum++;
 249                         if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
 250                                 nflag = 1;
 251                         if (more != NULL)
 252                                 *more = !feof(f);
 253                         return (p);
 254                 }
 255                 script = script->next;
 256                 (void)fclose(f);
 257                 state = ST_EOF;
 258                 goto again;
 259         case ST_STRING:
 260                 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
 261                         nflag = 1;
 262                 p = buf;
 263                 for (;;) {
 264                         if (n-- <= 1) {
 265                                 *p = '\0';
 266                                 linenum++;
 267                                 if (more != NULL)
 268                                         *more = 1;
 269                                 return (buf);
 270                         }
 271                         switch (*s) {
 272                         case '\0':
 273                                 state = ST_EOF;
 274                                 if (s == script->s) {
 275                                         script = script->next;
 276                                         goto again;
 277                                 } else {
 278                                         script = script->next;
 279                                         *p = '\0';
 280                                         linenum++;
 281                                         if (more != NULL)
 282                                                 *more = 0;
 283                                         return (buf);
 284                                 }
 285                         case '\n':
 286                                 *p++ = '\n';
 287                                 *p = '\0';
 288                                 s++;
 289                                 linenum++;
 290                                 if (more != NULL)
 291                                         *more = 0;
 292                                 return (buf);
 293                         default:
 294                                 *p++ = *s++;
 295                         }
 296                 }
 297         }
 298         /* NOTREACHED */
 299         return (NULL);
 300 }
 301
 302 /*
 303  * Like fgets, but go through the list of files chaining them together.
 304  * Set len to the length of the line.
 305  */
 306 int
 307 mf_fgets(SPACE *sp, enum e_spflag spflag)
 308 {
 309         struct stat sb;
 310         size_t len;
 311         char *p;
 312         int c;
 313         static int firstfile;
 314
 315         if (infile == NULL) {
 316                 /* stdin? */
 317                 if (files->fname == NULL) {
 318                         if (inplace != NULL)
 319                                 errx(1, "-I or -i may not be used with stdin");
 320                         infile = stdin;
 321                         fname = "stdin";
 322                         outfile = stdout;
 323                         outfname = "stdout";
 324                 }
 325                 firstfile = 1;
 326         }
 327
 328         for (;;) {
 329                 if (infile != NULL && (c = getc(infile)) != EOF) {
 330                         (void)ungetc(c, infile);
 331                         break;
 332                 }
 333                 /* If we are here then either eof or no files are open yet */
 334                 if (infile == stdin) {
 335                         sp->len = 0;
 336                         return (0);
 337                 }
 338                 if (infile != NULL) {
 339                         fclose(infile);
 340                         if (*oldfname != '\0') {
 341                                 /* if there was a backup file, remove it */
 342                                 unlink(oldfname);
 343                                 /*
 344                                  * Backup the original.  Note that hard links
 345                                  * are not supported on all filesystems.
 346                                  */
 347                                 if ((link(fname, oldfname) != 0) &&
 348                                    (rename(fname, oldfname) != 0)) {
 349                                         warn("rename()");
 350                                         if (*tmpfname)
 351                                                 unlink(tmpfname);
 352                                         exit(1);
 353                                 }
 354                                 *oldfname = '\0';
 355                         }
 356                         if (*tmpfname != '\0') {
 357                                 if (outfile != NULL && outfile != stdout)
 358                                         if (fclose(outfile) != 0) {
 359                                                 warn("fclose()");
 360                                                 unlink(tmpfname);
 361                                                 exit(1);
 362                                         }
 363                                 outfile = NULL;
 364                                 if (rename(tmpfname, fname) != 0) {
 365                                         /* this should not happen really! */
 366                                         warn("rename()");
 367                                         unlink(tmpfname);
 368                                         exit(1);
 369                                 }
 370                                 *tmpfname = '\0';
 371                         }
 372                         outfname = NULL;
 373                 }
 374                 if (firstfile == 0)
 375                         files = files->next;
 376                 else
 377                         firstfile = 0;
 378                 if (files == NULL) {
 379                         sp->len = 0;
 380                         return (0);
 381                 }
 382                 fname = files->fname;
 383                 if (inplace != NULL) {
 384                         if (lstat(fname, &sb) != 0)
 385                                 err(1, "%s", fname);
 386                         if (!(sb.st_mode & S_IFREG))
 387                                 errx(1, "%s: %s %s", fname,
 388                                     "in-place editing only",
 389                                     "works for regular files");
 390                         if (*inplace != '\0') {
 391                                 strlcpy(oldfname, fname,
 392                                     sizeof(oldfname));
 393                                 len = strlcat(oldfname, inplace,
 394                                     sizeof(oldfname));
 395                                 if (len > sizeof(oldfname))
 396                                         errx(1, "%s: name too long", fname);
 397                         }
 398                         len = snprintf(tmpfname, sizeof(tmpfname),
 399                             "%s/.!%ld!%s", dirname(fname), (long)getpid(),
 400                             basename(fname));
 401                         if (len >= sizeof(tmpfname))
 402                                 errx(1, "%s: name too long", fname);
 403                         unlink(tmpfname);
 404                         if ((outfile = fopen(tmpfname, "w")) == NULL)
 405                                 err(1, "%s", fname);
 406                         fchown(fileno(outfile), sb.st_uid, sb.st_gid);
 407                         fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
 408                         outfname = tmpfname;
 409                         if (!ispan) {
 410                                 linenum = 0;
 411                                 resetstate();
 412                         }
 413                 } else {
 414                         outfile = stdout;
 415                         outfname = "stdout";
 416                 }
 417                 if ((infile = fopen(fname, "r")) == NULL) {
 418                         warn("%s", fname);
 419                         rval = 1;
 420                         continue;
 421                 }
 422         }
 423         /*
 424          * We are here only when infile is open and we still have something
 425          * to read from it.
 426          *
 427          * Use fgetln so that we can handle essentially infinite input data.
 428          * Can't use the pointer into the stdio buffer as the process space
 429          * because the ungetc() can cause it to move.
 430          */
 431         p = fgetln(infile, &len);
 432         if (ferror(infile))
 433                 errx(1, "%s: %s", fname, strerror(errno ? errno : EIO));
 434         if (len != 0 && p[len - 1] == '\n')
 435                 len--;
 436         cspace(sp, p, len, spflag);
 437
 438         linenum++;
 439
 440         return (1);
 441 }
 442
 443 /*
 444  * Add a compilation unit to the linked list
 445  */
 446 static void
 447 add_compunit(enum e_cut type, char *s)
 448 {
 449         struct s_compunit *cu;
 450
 451         if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
 452                 err(1, "malloc");
 453         cu->type = type;
 454         cu->s = s;
 455         cu->next = NULL;
 456         *cu_nextp = cu;
 457         cu_nextp = &cu->next;
 458 }
 459
 460 /*
 461  * Add a file to the linked list
 462  */
 463 static void
 464 add_file(char *s)
 465 {
 466         struct s_flist *fp;
 467
 468         if ((fp = malloc(sizeof(struct s_flist))) == NULL)
 469                 err(1, "malloc");
 470         fp->next = NULL;
 471         *fl_nextp = fp;
 472         fp->fname = s;
 473         fl_nextp = &fp->next;
 474 }
 475
 476 int
 477 lastline(void)
 478 {
 479         int ch;
 480
 481         if (files->next != NULL && (inplace == NULL || ispan))
 482                 return (0);
 483         if ((ch = getc(infile)) == EOF)
 484                 return (1);
 485         ungetc(ch, infile);
 486         return (0);
 487 }