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  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  * @(#) Copyright (c) 1992, 1993 The Regents of the University of California.  All rights reserved.
  38  * @(#)main.c   8.2 (Berkeley) 1/3/94
  39  * $FreeBSD: src/usr.bin/sed/main.c,v 1.9.2.7 2002/08/06 10:03:29 fanf Exp $
  40  * $DragonFly: src/usr.bin/sed/main.c,v 1.3 2003/10/04 20:36:50 hmp Exp $
  41  */
  42
  43 #include <sys/types.h>
  44 #include <sys/mman.h>
  45 #include <sys/param.h>
  46 #include <sys/stat.h>
  47
  48 #include <err.h>
  49 #include <errno.h>
  50 #include <fcntl.h>
  51 #include <locale.h>
  52 #include <regex.h>
  53 #include <stddef.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58
  59 #include "defs.h"
  60 #include "extern.h"
  61
  62 /*
  63  * Linked list of units (strings and files) to be compiled
  64  */
  65 struct s_compunit {
  66         struct s_compunit *next;
  67         enum e_cut {CU_FILE, CU_STRING} type;
  68         char *s;                        /* Pointer to string or fname */
  69 };
  70
  71 /*
  72  * Linked list pointer to compilation units and pointer to current
  73  * next pointer.
  74  */
  75 static struct s_compunit *script, **cu_nextp = &script;
  76
  77 /*
  78  * Linked list of files to be processed
  79  */
  80 struct s_flist {
  81         char *fname;
  82         struct s_flist *next;
  83 };
  84
  85 /*
  86  * Linked list pointer to files and pointer to current
  87  * next pointer.
  88  */
  89 static struct s_flist *files, **fl_nextp = &files;
  90
  91 static FILE *curfile;           /* Current open file */
  92
  93 int aflag, eflag, nflag;
  94 int rflags = 0;
  95 static int rval;                /* Exit status */
  96
  97 /*
  98  * Current file and line number; line numbers restart across compilation
  99  * units, but span across input files.
 100  */
 101 const char *fname;              /* File name. */
 102 const char *inplace;            /* Inplace edit file extension. */
 103 u_long linenum;
 104
 105 static void add_compunit(enum e_cut, char *);
 106 static void add_file(char *);
 107 static int inplace_edit(char **);
 108 static void usage(void);
 109
 110 int
 111 main(int argc, char **argv)
 112 {
 113         int c, fflag;
 114         char *temp_arg;
 115
 116         (void) setlocale(LC_ALL, "");
 117
 118         fflag = 0;
 119         inplace = NULL;
 120
 121         while ((c = getopt(argc, argv, "Eae:f:i:n")) != -1)
 122                 switch (c) {
 123                 case 'E':
 124                         rflags = REG_EXTENDED;
 125                         break;
 126                 case 'a':
 127                         aflag = 1;
 128                         break;
 129                 case 'e':
 130                         eflag = 1;
 131                         if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
 132                                 err(1, "malloc");
 133                         strcpy(temp_arg, optarg);
 134                         strcat(temp_arg, "\n");
 135                         add_compunit(CU_STRING, temp_arg);
 136                         break;
 137                 case 'f':
 138                         fflag = 1;
 139                         add_compunit(CU_FILE, optarg);
 140                         break;
 141                 case 'i':
 142                         inplace = optarg;
 143                         break;
 144                 case 'n':
 145                         nflag = 1;
 146                         break;
 147                 default:
 148                 case '?':
 149                         usage();
 150                 }
 151         argc -= optind;
 152         argv += optind;
 153
 154         /* First usage case; script is the first arg */
 155         if (!eflag && !fflag && *argv) {
 156                 add_compunit(CU_STRING, *argv);
 157                 argv++;
 158         }
 159
 160         compile();
 161
 162         /* Continue with first and start second usage */
 163         if (*argv)
 164                 for (; *argv; argv++)
 165                         add_file(*argv);
 166         else
 167                 add_file(NULL);
 168         process();
 169         cfclose(prog, NULL);
 170         if (fclose(stdout))
 171                 err(1, "stdout");
 172         exit(rval);
 173 }
 174
 175 static void
 176 usage(void)
 177 {
 178         (void)fprintf(stderr, "%s\n%s\n",
 179                 "usage: sed script [-Ean] [-i extension] [file ...]",
 180                 "       sed [-an] [-i extension] [-e script] ... [-f script_file] ... [file ...]");
 181         exit(1);
 182 }
 183
 184 /*
 185  * Like fgets, but go through the chain of compilation units chaining them
 186  * together.  Empty strings and files are ignored.
 187  */
 188 char *
 189 cu_fgets(char *buf, int n, int *more)
 190 {
 191         static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
 192         static FILE *f;         /* Current open file */
 193         static char *s;         /* Current pointer inside string */
 194         static char string_ident[30];
 195         char *p;
 196
 197 again:
 198         switch (state) {
 199         case ST_EOF:
 200                 if (script == NULL) {
 201                         if (more != NULL)
 202                                 *more = 0;
 203                         return (NULL);
 204                 }
 205                 linenum = 0;
 206                 switch (script->type) {
 207                 case CU_FILE:
 208                         if ((f = fopen(script->s, "r")) == NULL)
 209                                 err(1, "%s", script->s);
 210                         fname = script->s;
 211                         state = ST_FILE;
 212                         goto again;
 213                 case CU_STRING:
 214                         if ((snprintf(string_ident,
 215                             sizeof(string_ident), "\"%s\"", script->s)) >=
 216                             sizeof(string_ident) - 1)
 217                                 (void)strcpy(string_ident +
 218                                     sizeof(string_ident) - 6, " ...\"");
 219                         fname = string_ident;
 220                         s = script->s;
 221                         state = ST_STRING;
 222                         goto again;
 223                 }
 224         case ST_FILE:
 225                 if ((p = fgets(buf, n, f)) != NULL) {
 226                         linenum++;
 227                         if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
 228                                 nflag = 1;
 229                         if (more != NULL)
 230                                 *more = !feof(f);
 231                         return (p);
 232                 }
 233                 script = script->next;
 234                 (void)fclose(f);
 235                 state = ST_EOF;
 236                 goto again;
 237         case ST_STRING:
 238                 if (linenum == 0 && s[0] == '#' && s[1] == 'n')
 239                         nflag = 1;
 240                 p = buf;
 241                 for (;;) {
 242                         if (n-- <= 1) {
 243                                 *p = '\0';
 244                                 linenum++;
 245                                 if (more != NULL)
 246                                         *more = 1;
 247                                 return (buf);
 248                         }
 249                         switch (*s) {
 250                         case '\0':
 251                                 state = ST_EOF;
 252                                 if (s == script->s) {
 253                                         script = script->next;
 254                                         goto again;
 255                                 } else {
 256                                         script = script->next;
 257                                         *p = '\0';
 258                                         linenum++;
 259                                         if (more != NULL)
 260                                                 *more = 0;
 261                                         return (buf);
 262                                 }
 263                         case '\n':
 264                                 *p++ = '\n';
 265                                 *p = '\0';
 266                                 s++;
 267                                 linenum++;
 268                                 if (more != NULL)
 269                                         *more = 0;
 270                                 return (buf);
 271                         default:
 272                                 *p++ = *s++;
 273                         }
 274                 }
 275         }
 276         /* NOTREACHED */
 277         return (NULL);
 278 }
 279
 280 /*
 281  * Like fgets, but go through the list of files chaining them together.
 282  * Set len to the length of the line.
 283  */
 284 int
 285 mf_fgets(SPACE *sp, enum e_spflag spflag)
 286 {
 287         size_t len;
 288         char *p;
 289         int c;
 290         static int firstfile;
 291
 292         if (curfile == NULL) {
 293                 /* stdin? */
 294                 if (files->fname == NULL) {
 295                         if (inplace != NULL)
 296                                 errx(1, "-i may not be used with stdin");
 297                         curfile = stdin;
 298                         fname = "stdin";
 299                 }
 300                 firstfile = 1;
 301         }
 302
 303         for (;;) {
 304                 if (curfile != NULL && (c = getc(curfile)) != EOF) {
 305                         (void)ungetc(c, curfile);
 306                         break;
 307                 }
 308                 /* If we are here then either eof or no files are open yet */
 309                 if (curfile == stdin) {
 310                         sp->len = 0;
 311                         return (0);
 312                 }
 313                 if (curfile != NULL) {
 314                         fclose(curfile);
 315                 }
 316                 if (firstfile == 0) {
 317                         files = files->next;
 318                 } else
 319                         firstfile = 0;
 320                 if (files == NULL) {
 321                         sp->len = 0;
 322                         return (0);
 323                 }
 324                 if (inplace != NULL) {
 325                         if (inplace_edit(&files->fname) == -1)
 326                                 continue;
 327                 }
 328                 fname = files->fname;
 329                 if ((curfile = fopen(fname, "r")) == NULL) {
 330                         warn("%s", fname);
 331                         rval = 1;
 332                         continue;
 333                 }
 334                 if (inplace != NULL && *inplace == '\0')
 335                         unlink(fname);
 336         }
 337         /*
 338          * We are here only when curfile is open and we still have something
 339          * to read from it.
 340          *
 341          * Use fgetln so that we can handle essentially infinite input data.
 342          * Can't use the pointer into the stdio buffer as the process space
 343          * because the ungetc() can cause it to move.
 344          */
 345         p = fgetln(curfile, &len);
 346         if (ferror(curfile))
 347                 errx(1, "%s: %s", fname, strerror(errno ? errno : EIO));
 348         if (len != 0 && p[len - 1] == '\n')
 349                 len--;
 350         cspace(sp, p, len, spflag);
 351
 352         linenum++;
 353
 354         return (1);
 355 }
 356
 357 /*
 358  * Add a compilation unit to the linked list
 359  */
 360 static void
 361 add_compunit(enum e_cut type, char *s)
 362 {
 363         struct s_compunit *cu;
 364
 365         if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
 366                 err(1, "malloc");
 367         cu->type = type;
 368         cu->s = s;
 369         cu->next = NULL;
 370         *cu_nextp = cu;
 371         cu_nextp = &cu->next;
 372 }
 373
 374 /*
 375  * Add a file to the linked list
 376  */
 377 static void
 378 add_file(char *s)
 379 {
 380         struct s_flist *fp;
 381
 382         if ((fp = malloc(sizeof(struct s_flist))) == NULL)
 383                 err(1, "malloc");
 384         fp->next = NULL;
 385         *fl_nextp = fp;
 386         fp->fname = s;
 387         fl_nextp = &fp->next;
 388 }
 389
 390 /*
 391  * Modify a pointer to a filename for inplace editing and reopen stdout
 392  */
 393 static int
 394 inplace_edit(char **filename)
 395 {
 396         struct stat orig;
 397         char backup[MAXPATHLEN];
 398
 399         if (lstat(*filename, &orig) == -1)
 400                 err(1, "lstat");
 401         if ((orig.st_mode & S_IFREG) == 0) {
 402                 warnx("cannot inplace edit %s, not a regular file", *filename);
 403                 return -1;
 404         }
 405
 406         if (*inplace == '\0') {
 407                 /*
 408                  * This is a bit of a hack: we use mkstemp() to avoid the
 409                  * mktemp() link-time warning, although mktemp() would fit in
 410                  * this context much better. We're only interested in getting
 411                  * a name for use in the rename(); there aren't any security
 412                  * issues here that don't already exist in relation to the
 413                  * original file and its directory.
 414                  */
 415                 int fd;
 416                 strlcpy(backup, *filename, sizeof(backup));
 417                 strlcat(backup, ".XXXXXXXXXX", sizeof(backup));
 418                 fd = mkstemp(backup);
 419                 if (fd == -1)
 420                         errx(1, "could not create backup of %s", *filename);
 421                 else
 422                         close(fd);
 423         } else {
 424                 strlcpy(backup, *filename, sizeof(backup));
 425                 strlcat(backup, inplace, sizeof(backup));
 426         }
 427
 428         if (rename(*filename, backup) == -1)
 429                 err(1, "rename(\"%s\", \"%s\")", *filename, backup);
 430         if (freopen(*filename, "w", stdout) == NULL)
 431                 err(1, "open(\"%s\")", *filename);
 432         if (fchmod(fileno(stdout), orig.st_mode) == -1)
 433                 err(1, "chmod(\"%s\")", *filename);
 434         *filename = strdup(backup);
 435         if (*filename == NULL)
 436                 err(1, "malloc");
 437         return 0;
 438 }
 439
 440 int
 441 lastline(void)
 442 {
 443         int ch;
 444
 445         if (files->next != NULL)
 446                 return (0);
 447         if ((ch = getc(curfile)) == EOF)
 448                 return (1);
 449         ungetc(ch, curfile);
 450         return (0);
 451 }