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 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #ifndef lint 42 static const char copyright[] = 43 "@(#) Copyright (c) 1992, 1993\n\ 44 The Regents of the University of California. All rights reserved.\n"; 45 #endif 46 47 #ifndef lint 48 static const char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94"; 49 #endif 50 51 #include <sys/types.h> 52 #include <sys/mman.h> 53 #include <sys/param.h> 54 #include <sys/stat.h> 55 56 #include <err.h> 57 #include <errno.h> 58 #include <fcntl.h> 59 #include <locale.h> 60 #include <regex.h> 61 #include <stddef.h> 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 int aflag, eflag, nflag; 100 int rflags = 0; 101 static int rval; /* Exit status */ 102 103 /* 104 * Current file and line number; line numbers restart across compilation 105 * units, but span across input files. 106 */ 107 const char *fname; /* File name. */ 108 const char *inplace; /* Inplace edit file extension. */ 109 u_long linenum; 110 int lastline; /* TRUE on the last line of the last file */ 111 112 static void add_compunit(enum e_cut, char *); 113 static void add_file(char *); 114 static int inplace_edit(char **); 115 static void usage(void); 116 117 int 118 main(argc, argv) 119 int argc; 120 char *argv[]; 121 { 122 int c, fflag; 123 char *temp_arg; 124 125 (void) setlocale(LC_ALL, ""); 126 127 fflag = 0; 128 inplace = NULL; 129 130 while ((c = getopt(argc, argv, "Eae:f:i:n")) != -1) 131 switch (c) { 132 case 'E': 133 rflags = REG_EXTENDED; 134 break; 135 case 'a': 136 aflag = 1; 137 break; 138 case 'e': 139 eflag = 1; 140 if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL) 141 err(1, "malloc"); 142 strcpy(temp_arg, optarg); 143 strcat(temp_arg, "\n"); 144 add_compunit(CU_STRING, temp_arg); 145 break; 146 case 'f': 147 fflag = 1; 148 add_compunit(CU_FILE, optarg); 149 break; 150 case 'i': 151 inplace = optarg; 152 break; 153 case 'n': 154 nflag = 1; 155 break; 156 default: 157 case '?': 158 usage(); 159 } 160 argc -= optind; 161 argv += optind; 162 163 /* First usage case; script is the first arg */ 164 if (!eflag && !fflag && *argv) { 165 add_compunit(CU_STRING, *argv); 166 argv++; 167 } 168 169 compile(); 170 171 /* Continue with first and start second usage */ 172 if (*argv) 173 for (; *argv; argv++) 174 add_file(*argv); 175 else 176 add_file(NULL); 177 process(); 178 cfclose(prog, NULL); 179 if (fclose(stdout)) 180 err(1, "stdout"); 181 exit(rval); 182 } 183 184 static void 185 usage() 186 { 187 (void)fprintf(stderr, "%s\n%s\n", 188 "usage: sed script [-Ean] [-i extension] [file ...]", 189 " sed [-an] [-i extension] [-e script] ... [-f script_file] ... [file ...]"); 190 exit(1); 191 } 192 193 /* 194 * Like fgets, but go through the chain of compilation units chaining them 195 * together. Empty strings and files are ignored. 196 */ 197 char * 198 cu_fgets(buf, n, more) 199 char *buf; 200 int n; 201 int *more; 202 { 203 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 204 static FILE *f; /* Current open file */ 205 static char *s; /* Current pointer inside string */ 206 static char string_ident[30]; 207 char *p; 208 209 again: 210 switch (state) { 211 case ST_EOF: 212 if (script == NULL) { 213 if (more != NULL) 214 *more = 0; 215 return (NULL); 216 } 217 linenum = 0; 218 switch (script->type) { 219 case CU_FILE: 220 if ((f = fopen(script->s, "r")) == NULL) 221 err(1, "%s", script->s); 222 fname = script->s; 223 state = ST_FILE; 224 goto again; 225 case CU_STRING: 226 if ((snprintf(string_ident, 227 sizeof(string_ident), "\"%s\"", script->s)) >= 228 sizeof(string_ident) - 1) 229 (void)strcpy(string_ident + 230 sizeof(string_ident) - 6, " ...\""); 231 fname = string_ident; 232 s = script->s; 233 state = ST_STRING; 234 goto again; 235 } 236 case ST_FILE: 237 if ((p = fgets(buf, n, f)) != NULL) { 238 linenum++; 239 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 240 nflag = 1; 241 if (more != NULL) 242 *more = !feof(f); 243 return (p); 244 } 245 script = script->next; 246 (void)fclose(f); 247 state = ST_EOF; 248 goto again; 249 case ST_STRING: 250 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 251 nflag = 1; 252 p = buf; 253 for (;;) { 254 if (n-- <= 1) { 255 *p = '\0'; 256 linenum++; 257 if (more != NULL) 258 *more = 1; 259 return (buf); 260 } 261 switch (*s) { 262 case '\0': 263 state = ST_EOF; 264 if (s == script->s) { 265 script = script->next; 266 goto again; 267 } else { 268 script = script->next; 269 *p = '\0'; 270 linenum++; 271 if (more != NULL) 272 *more = 0; 273 return (buf); 274 } 275 case '\n': 276 *p++ = '\n'; 277 *p = '\0'; 278 s++; 279 linenum++; 280 if (more != NULL) 281 *more = 0; 282 return (buf); 283 default: 284 *p++ = *s++; 285 } 286 } 287 } 288 /* NOTREACHED */ 289 return (NULL); 290 } 291 292 /* 293 * Like fgets, but go through the list of files chaining them together. 294 * Set len to the length of the line. 295 */ 296 int 297 mf_fgets(sp, spflag) 298 SPACE *sp; 299 enum e_spflag spflag; 300 { 301 static FILE *f; /* Current open file */ 302 size_t len; 303 char *p; 304 int c; 305 static int firstfile; 306 307 if (f == NULL) { 308 /* stdin? */ 309 if (files->fname == NULL) { 310 if (inplace != NULL) 311 errx(1, "-i may not be used with stdin"); 312 f = stdin; 313 fname = "stdin"; 314 } 315 firstfile = 1; 316 } 317 318 for (;;) { 319 if (f != NULL && (c = getc(f)) != EOF) { 320 (void)ungetc(c, f); 321 break; 322 } 323 /* If we are here then either eof or no files are open yet */ 324 if (f == stdin) { 325 sp->len = 0; 326 lastline = 1; 327 return (0); 328 } 329 if (f != NULL) { 330 fclose(f); 331 } 332 if (firstfile == 0) { 333 files = files->next; 334 } else 335 firstfile = 0; 336 if (files == NULL) { 337 sp->len = 0; 338 lastline = 1; 339 return (0); 340 } 341 if (inplace != NULL) { 342 if (inplace_edit(&files->fname) == -1) 343 continue; 344 } 345 fname = files->fname; 346 if ((f = fopen(fname, "r")) == NULL) { 347 warn("%s", fname); 348 rval = 1; 349 continue; 350 } 351 if (inplace != NULL && *inplace == '\0') 352 unlink(fname); 353 } 354 /* 355 * We are here only when f is open and we still have something to 356 * read from it. 357 * 358 * Use fgetln so that we can handle essentially infinite input data. 359 * Can't use the pointer into the stdio buffer as the process space 360 * because the ungetc() can cause it to move. 361 */ 362 p = fgetln(f, &len); 363 if (ferror(f)) 364 errx(1, "%s: %s", fname, strerror(errno ? errno : EIO)); 365 if (len != 0 && p[len - 1] == '\n') 366 len--; 367 cspace(sp, p, len, spflag); 368 369 linenum++; 370 if (files->next == NULL) { 371 if ((c = getc(f)) != EOF) { 372 (void)ungetc(c, f); 373 } else { 374 lastline = 1; 375 } 376 } 377 378 return (1); 379 } 380 381 /* 382 * Add a compilation unit to the linked list 383 */ 384 static void 385 add_compunit(type, s) 386 enum e_cut type; 387 char *s; 388 { 389 struct s_compunit *cu; 390 391 if ((cu = malloc(sizeof(struct s_compunit))) == NULL) 392 err(1, "malloc"); 393 cu->type = type; 394 cu->s = s; 395 cu->next = NULL; 396 *cu_nextp = cu; 397 cu_nextp = &cu->next; 398 } 399 400 /* 401 * Add a file to the linked list 402 */ 403 static void 404 add_file(s) 405 char *s; 406 { 407 struct s_flist *fp; 408 409 if ((fp = malloc(sizeof(struct s_flist))) == NULL) 410 err(1, "malloc"); 411 fp->next = NULL; 412 *fl_nextp = fp; 413 fp->fname = s; 414 fl_nextp = &fp->next; 415 } 416 417 /* 418 * Modify a pointer to a filename for inplace editing and reopen stdout 419 */ 420 static int 421 inplace_edit(filename) 422 char **filename; 423 { 424 struct stat orig; 425 int input, output; 426 char backup[MAXPATHLEN]; 427 char *buffer; 428 429 if (lstat(*filename, &orig) == -1) 430 err(1, "lstat"); 431 if ((orig.st_mode & S_IFREG) == 0) { 432 warnx("cannot inplace edit %s, not a regular file", *filename); 433 return -1; 434 } 435 436 if (*inplace == '\0') { 437 char template[] = "/tmp/sed.XXXXXXXXXX"; 438 439 output = mkstemp(template); 440 if (output == -1) 441 err(1, "mkstemp"); 442 strlcpy(backup, template, MAXPATHLEN); 443 } else { 444 strlcpy(backup, *filename, MAXPATHLEN); 445 strlcat(backup, inplace, MAXPATHLEN); 446 output = open(backup, O_WRONLY | O_CREAT | O_TRUNC); 447 if (output == -1) 448 err(1, "open(%s)", backup); 449 } 450 451 input = open(*filename, O_RDONLY); 452 if (input == -1) 453 err(1, "open(%s)", *filename); 454 if (fchmod(output, orig.st_mode & ~S_IFMT) == -1) 455 err(1, "chmod"); 456 buffer = (char *)mmap(0, orig.st_size, PROT_READ, MAP_SHARED, input, 0); 457 if (buffer == MAP_FAILED) 458 err(1, "mmap(%s)", *filename); 459 if (write(output, buffer, orig.st_size) == -1) 460 err(1, "write(%s)", backup); 461 if (munmap(buffer, orig.st_size) == -1) 462 err(1, "munmap(%s)", *filename); 463 close(input); 464 close(output); 465 freopen(*filename, "w", stdout); 466 *filename = strdup(backup); 467 return 0; 468 } 469