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 static FILE *curfile; /* Current open file */ 100 101 int aflag, eflag, nflag; 102 int rflags = 0; 103 static int rval; /* Exit status */ 104 105 /* 106 * Current file and line number; line numbers restart across compilation 107 * units, but span across input files. 108 */ 109 const char *fname; /* File name. */ 110 const char *inplace; /* Inplace edit file extension. */ 111 u_long linenum; 112 113 static void add_compunit(enum e_cut, char *); 114 static void add_file(char *); 115 static int inplace_edit(char **); 116 static void usage(void); 117 118 int 119 main(argc, argv) 120 int argc; 121 char *argv[]; 122 { 123 int c, fflag; 124 char *temp_arg; 125 126 (void) setlocale(LC_ALL, ""); 127 128 fflag = 0; 129 inplace = NULL; 130 131 while ((c = getopt(argc, argv, "Eae:f:i:n")) != -1) 132 switch (c) { 133 case 'E': 134 rflags = REG_EXTENDED; 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 break; 154 case 'n': 155 nflag = 1; 156 break; 157 default: 158 case '?': 159 usage(); 160 } 161 argc -= optind; 162 argv += optind; 163 164 /* First usage case; script is the first arg */ 165 if (!eflag && !fflag && *argv) { 166 add_compunit(CU_STRING, *argv); 167 argv++; 168 } 169 170 compile(); 171 172 /* Continue with first and start second usage */ 173 if (*argv) 174 for (; *argv; argv++) 175 add_file(*argv); 176 else 177 add_file(NULL); 178 process(); 179 cfclose(prog, NULL); 180 if (fclose(stdout)) 181 err(1, "stdout"); 182 exit(rval); 183 } 184 185 static void 186 usage() 187 { 188 (void)fprintf(stderr, "%s\n%s\n", 189 "usage: sed script [-Ean] [-i extension] [file ...]", 190 " sed [-an] [-i extension] [-e script] ... [-f script_file] ... [file ...]"); 191 exit(1); 192 } 193 194 /* 195 * Like fgets, but go through the chain of compilation units chaining them 196 * together. Empty strings and files are ignored. 197 */ 198 char * 199 cu_fgets(buf, n, more) 200 char *buf; 201 int n; 202 int *more; 203 { 204 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 205 static FILE *f; /* Current open file */ 206 static char *s; /* Current pointer inside string */ 207 static char string_ident[30]; 208 char *p; 209 210 again: 211 switch (state) { 212 case ST_EOF: 213 if (script == NULL) { 214 if (more != NULL) 215 *more = 0; 216 return (NULL); 217 } 218 linenum = 0; 219 switch (script->type) { 220 case CU_FILE: 221 if ((f = fopen(script->s, "r")) == NULL) 222 err(1, "%s", script->s); 223 fname = script->s; 224 state = ST_FILE; 225 goto again; 226 case CU_STRING: 227 if ((snprintf(string_ident, 228 sizeof(string_ident), "\"%s\"", script->s)) >= 229 sizeof(string_ident) - 1) 230 (void)strcpy(string_ident + 231 sizeof(string_ident) - 6, " ...\""); 232 fname = string_ident; 233 s = script->s; 234 state = ST_STRING; 235 goto again; 236 } 237 case ST_FILE: 238 if ((p = fgets(buf, n, f)) != NULL) { 239 linenum++; 240 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 241 nflag = 1; 242 if (more != NULL) 243 *more = !feof(f); 244 return (p); 245 } 246 script = script->next; 247 (void)fclose(f); 248 state = ST_EOF; 249 goto again; 250 case ST_STRING: 251 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 252 nflag = 1; 253 p = buf; 254 for (;;) { 255 if (n-- <= 1) { 256 *p = '\0'; 257 linenum++; 258 if (more != NULL) 259 *more = 1; 260 return (buf); 261 } 262 switch (*s) { 263 case '\0': 264 state = ST_EOF; 265 if (s == script->s) { 266 script = script->next; 267 goto again; 268 } else { 269 script = script->next; 270 *p = '\0'; 271 linenum++; 272 if (more != NULL) 273 *more = 0; 274 return (buf); 275 } 276 case '\n': 277 *p++ = '\n'; 278 *p = '\0'; 279 s++; 280 linenum++; 281 if (more != NULL) 282 *more = 0; 283 return (buf); 284 default: 285 *p++ = *s++; 286 } 287 } 288 } 289 /* NOTREACHED */ 290 return (NULL); 291 } 292 293 /* 294 * Like fgets, but go through the list of files chaining them together. 295 * Set len to the length of the line. 296 */ 297 int 298 mf_fgets(sp, spflag) 299 SPACE *sp; 300 enum e_spflag spflag; 301 { 302 size_t len; 303 char *p; 304 int c; 305 static int firstfile; 306 307 if (curfile == NULL) { 308 /* stdin? */ 309 if (files->fname == NULL) { 310 if (inplace != NULL) 311 errx(1, "-i may not be used with stdin"); 312 curfile = stdin; 313 fname = "stdin"; 314 } 315 firstfile = 1; 316 } 317 318 for (;;) { 319 if (curfile != NULL && (c = getc(curfile)) != EOF) { 320 (void)ungetc(c, curfile); 321 break; 322 } 323 /* If we are here then either eof or no files are open yet */ 324 if (curfile == stdin) { 325 sp->len = 0; 326 return (0); 327 } 328 if (curfile != NULL) { 329 fclose(curfile); 330 } 331 if (firstfile == 0) { 332 files = files->next; 333 } else 334 firstfile = 0; 335 if (files == NULL) { 336 sp->len = 0; 337 return (0); 338 } 339 if (inplace != NULL) { 340 if (inplace_edit(&files->fname) == -1) 341 continue; 342 } 343 fname = files->fname; 344 if ((curfile = fopen(fname, "r")) == NULL) { 345 warn("%s", fname); 346 rval = 1; 347 continue; 348 } 349 if (inplace != NULL && *inplace == '\0') 350 unlink(fname); 351 } 352 /* 353 * We are here only when curfile is open and we still have something 354 * to read from it. 355 * 356 * Use fgetln so that we can handle essentially infinite input data. 357 * Can't use the pointer into the stdio buffer as the process space 358 * because the ungetc() can cause it to move. 359 */ 360 p = fgetln(curfile, &len); 361 if (ferror(curfile)) 362 errx(1, "%s: %s", fname, strerror(errno ? errno : EIO)); 363 if (len != 0 && p[len - 1] == '\n') 364 len--; 365 cspace(sp, p, len, spflag); 366 367 linenum++; 368 369 return (1); 370 } 371 372 /* 373 * Add a compilation unit to the linked list 374 */ 375 static void 376 add_compunit(type, s) 377 enum e_cut type; 378 char *s; 379 { 380 struct s_compunit *cu; 381 382 if ((cu = malloc(sizeof(struct s_compunit))) == NULL) 383 err(1, "malloc"); 384 cu->type = type; 385 cu->s = s; 386 cu->next = NULL; 387 *cu_nextp = cu; 388 cu_nextp = &cu->next; 389 } 390 391 /* 392 * Add a file to the linked list 393 */ 394 static void 395 add_file(s) 396 char *s; 397 { 398 struct s_flist *fp; 399 400 if ((fp = malloc(sizeof(struct s_flist))) == NULL) 401 err(1, "malloc"); 402 fp->next = NULL; 403 *fl_nextp = fp; 404 fp->fname = s; 405 fl_nextp = &fp->next; 406 } 407 408 /* 409 * Modify a pointer to a filename for inplace editing and reopen stdout 410 */ 411 static int 412 inplace_edit(filename) 413 char **filename; 414 { 415 struct stat orig; 416 int input, output; 417 char backup[MAXPATHLEN]; 418 char *buffer; 419 420 if (lstat(*filename, &orig) == -1) 421 err(1, "lstat"); 422 if ((orig.st_mode & S_IFREG) == 0) { 423 warnx("cannot inplace edit %s, not a regular file", *filename); 424 return -1; 425 } 426 427 if (*inplace == '\0') { 428 char template[] = "/tmp/sed.XXXXXXXXXX"; 429 430 output = mkstemp(template); 431 if (output == -1) 432 err(1, "mkstemp"); 433 strlcpy(backup, template, MAXPATHLEN); 434 } else { 435 strlcpy(backup, *filename, MAXPATHLEN); 436 strlcat(backup, inplace, MAXPATHLEN); 437 output = open(backup, O_WRONLY | O_CREAT | O_TRUNC); 438 if (output == -1) 439 err(1, "open(%s)", backup); 440 } 441 442 input = open(*filename, O_RDONLY); 443 if (input == -1) 444 err(1, "open(%s)", *filename); 445 if (fchmod(output, orig.st_mode & ~S_IFMT) == -1) 446 err(1, "chmod"); 447 buffer = (char *)mmap(0, orig.st_size, PROT_READ, MAP_SHARED, input, 0); 448 if (buffer == MAP_FAILED) 449 err(1, "mmap(%s)", *filename); 450 if (write(output, buffer, orig.st_size) == -1) 451 err(1, "write(%s)", backup); 452 if (munmap(buffer, orig.st_size) == -1) 453 err(1, "munmap(%s)", *filename); 454 close(input); 455 close(output); 456 freopen(*filename, "w", stdout); 457 *filename = strdup(backup); 458 return 0; 459 } 460 461 int 462 lastline(void) 463 { 464 int ch; 465 466 if (files->next != NULL) 467 return (0); 468 if ((ch = getc(curfile)) == EOF) 469 return (1); 470 ungetc(ch, curfile); 471 return (0); 472 } 473