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/param.h> 52 #include <sys/stat.h> 53 54 #include <err.h> 55 #include <errno.h> 56 #include <fcntl.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 int aflag, eflag, nflag; 98 int rflags = 0; 99 100 /* 101 * Current file and line number; line numbers restart across compilation 102 * units, but span across input files. 103 */ 104 const char *fname; /* File name. */ 105 const char *inplace; /* Inplace edit file extension. */ 106 u_long linenum; 107 int lastline; /* TRUE on the last line of the last file */ 108 109 static void add_compunit(enum e_cut, char *); 110 static void add_file(char *); 111 static int inplace_edit(char **); 112 static void usage(void); 113 114 int 115 main(argc, argv) 116 int argc; 117 char *argv[]; 118 { 119 int c, fflag; 120 char *temp_arg; 121 122 (void) setlocale(LC_ALL, ""); 123 124 fflag = 0; 125 inplace = NULL; 126 127 while ((c = getopt(argc, argv, "Eae:f:i:n")) != -1) 128 switch (c) { 129 case 'E': 130 rflags = REG_EXTENDED; 131 break; 132 case 'a': 133 aflag = 1; 134 break; 135 case 'e': 136 eflag = 1; 137 if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL) 138 err(1, "malloc"); 139 strcpy(temp_arg, optarg); 140 strcat(temp_arg, "\n"); 141 add_compunit(CU_STRING, temp_arg); 142 break; 143 case 'f': 144 fflag = 1; 145 add_compunit(CU_FILE, optarg); 146 break; 147 case 'i': 148 inplace = optarg; 149 break; 150 case 'n': 151 nflag = 1; 152 break; 153 default: 154 case '?': 155 usage(); 156 } 157 argc -= optind; 158 argv += optind; 159 160 /* First usage case; script is the first arg */ 161 if (!eflag && !fflag && *argv) { 162 add_compunit(CU_STRING, *argv); 163 argv++; 164 } 165 166 compile(); 167 168 /* Continue with first and start second usage */ 169 if (*argv) 170 for (; *argv; argv++) 171 add_file(*argv); 172 else 173 add_file(NULL); 174 process(); 175 cfclose(prog, NULL); 176 if (fclose(stdout)) 177 err(1, "stdout"); 178 exit (0); 179 } 180 181 static void 182 usage() 183 { 184 (void)fprintf(stderr, "%s\n%s\n", 185 "usage: sed script [-Ean] [-i extension] [file ...]", 186 " sed [-an] [-i extension] [-e script] ... [-f script_file] ... [file ...]"); 187 exit(1); 188 } 189 190 /* 191 * Like fgets, but go through the chain of compilation units chaining them 192 * together. Empty strings and files are ignored. 193 */ 194 char * 195 cu_fgets(buf, n, more) 196 char *buf; 197 int n; 198 int *more; 199 { 200 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 201 static FILE *f; /* Current open file */ 202 static char *s; /* Current pointer inside string */ 203 static char string_ident[30]; 204 char *p; 205 206 again: 207 switch (state) { 208 case ST_EOF: 209 if (script == NULL) { 210 if (more != NULL) 211 *more = 0; 212 return (NULL); 213 } 214 linenum = 0; 215 switch (script->type) { 216 case CU_FILE: 217 if ((f = fopen(script->s, "r")) == NULL) 218 err(1, "%s", script->s); 219 fname = script->s; 220 state = ST_FILE; 221 goto again; 222 case CU_STRING: 223 if ((snprintf(string_ident, 224 sizeof(string_ident), "\"%s\"", script->s)) >= 225 sizeof(string_ident) - 1) 226 (void)strcpy(string_ident + 227 sizeof(string_ident) - 6, " ...\""); 228 fname = string_ident; 229 s = script->s; 230 state = ST_STRING; 231 goto again; 232 } 233 case ST_FILE: 234 if ((p = fgets(buf, n, f)) != NULL) { 235 linenum++; 236 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 237 nflag = 1; 238 if (more != NULL) 239 *more = !feof(f); 240 return (p); 241 } 242 script = script->next; 243 (void)fclose(f); 244 state = ST_EOF; 245 goto again; 246 case ST_STRING: 247 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 248 nflag = 1; 249 p = buf; 250 for (;;) { 251 if (n-- <= 1) { 252 *p = '\0'; 253 linenum++; 254 if (more != NULL) 255 *more = 1; 256 return (buf); 257 } 258 switch (*s) { 259 case '\0': 260 state = ST_EOF; 261 if (s == script->s) { 262 script = script->next; 263 goto again; 264 } else { 265 script = script->next; 266 *p = '\0'; 267 linenum++; 268 if (more != NULL) 269 *more = 0; 270 return (buf); 271 } 272 case '\n': 273 *p++ = '\n'; 274 *p = '\0'; 275 s++; 276 linenum++; 277 if (more != NULL) 278 *more = 0; 279 return (buf); 280 default: 281 *p++ = *s++; 282 } 283 } 284 } 285 /* NOTREACHED */ 286 return (NULL); 287 } 288 289 /* 290 * Like fgets, but go through the list of files chaining them together. 291 * Set len to the length of the line. 292 */ 293 int 294 mf_fgets(sp, spflag) 295 SPACE *sp; 296 enum e_spflag spflag; 297 { 298 static FILE *f; /* Current open file */ 299 size_t len; 300 char *p; 301 int c; 302 303 if (f == NULL) 304 /* Advance to first non-empty file */ 305 for (;;) { 306 if (files == NULL) { 307 lastline = 1; 308 return (0); 309 } 310 if (files->fname == NULL) { 311 if (inplace != NULL) 312 errx(1, "-i may not be used with stdin"); 313 f = stdin; 314 fname = "stdin"; 315 } else { 316 if (inplace != NULL) { 317 if (inplace_edit(&files->fname) == -1) 318 continue; 319 } 320 fname = files->fname; 321 if ((f = fopen(fname, "r")) == NULL) 322 err(1, "%s", fname); 323 if (inplace != NULL && *inplace == '\0') 324 unlink(fname); 325 } 326 if ((c = getc(f)) != EOF) { 327 (void)ungetc(c, f); 328 break; 329 } 330 (void)fclose(f); 331 files = files->next; 332 } 333 334 if (lastline) { 335 sp->len = 0; 336 return (0); 337 } 338 339 /* 340 * Use fgetln so that we can handle essentially infinite input data. 341 * Can't use the pointer into the stdio buffer as the process space 342 * because the ungetc() can cause it to move. 343 */ 344 p = fgetln(f, &len); 345 if (ferror(f)) 346 errx(1, "%s: %s", fname, strerror(errno ? errno : EIO)); 347 cspace(sp, p, len, spflag); 348 349 linenum++; 350 /* Advance to next non-empty file */ 351 while ((c = getc(f)) == EOF) { 352 (void)fclose(f); 353 files = files->next; 354 if (files == NULL) { 355 lastline = 1; 356 return (1); 357 } 358 if (files->fname == NULL) { 359 if (inplace != NULL) 360 errx(1, "-i may not be used with stdin"); 361 f = stdin; 362 fname = "stdin"; 363 } else { 364 if (inplace != NULL) { 365 if (inplace_edit(&files->fname) == -1) 366 continue; 367 } 368 fname = files->fname; 369 if ((f = fopen(fname, "r")) == NULL) 370 err(1, "%s", fname); 371 if (inplace != NULL && *inplace == '\0') 372 unlink(fname); 373 } 374 } 375 (void)ungetc(c, f); 376 return (1); 377 } 378 379 /* 380 * Add a compilation unit to the linked list 381 */ 382 static void 383 add_compunit(type, s) 384 enum e_cut type; 385 char *s; 386 { 387 struct s_compunit *cu; 388 389 if ((cu = malloc(sizeof(struct s_compunit))) == NULL) 390 err(1, "malloc"); 391 cu->type = type; 392 cu->s = s; 393 cu->next = NULL; 394 *cu_nextp = cu; 395 cu_nextp = &cu->next; 396 } 397 398 /* 399 * Add a file to the linked list 400 */ 401 static void 402 add_file(s) 403 char *s; 404 { 405 struct s_flist *fp; 406 407 if ((fp = malloc(sizeof(struct s_flist))) == NULL) 408 err(1, "malloc"); 409 fp->next = NULL; 410 *fl_nextp = fp; 411 fp->fname = s; 412 fl_nextp = &fp->next; 413 } 414 415 /* 416 * Modify a pointer to a filename for inplace editing and reopen stdout 417 */ 418 static int 419 inplace_edit(filename) 420 char **filename; 421 { 422 struct stat orig; 423 int input, output; 424 char backup[MAXPATHLEN]; 425 char *buffer; 426 427 if (lstat(*filename, &orig) == -1) 428 err(1, "lstat"); 429 if ((orig.st_mode & S_IFREG) == 0) { 430 warnx("cannot inplace edit %s, not a regular file", *filename); 431 return -1; 432 } 433 434 if (*inplace == '\0') { 435 char template[] = "/tmp/sed.XXXXXXXXXX"; 436 437 output = mkstemp(template); 438 if (output == -1) 439 err(1, "mkstemp"); 440 strlcpy(backup, template, MAXPATHLEN); 441 } else { 442 strlcpy(backup, *filename, MAXPATHLEN); 443 strlcat(backup, inplace, MAXPATHLEN); 444 output = open(backup, O_WRONLY | O_CREAT | O_EXCL); 445 if (output == -1) 446 err(1, "open(%s)", backup); 447 } 448 449 input = open(*filename, O_RDONLY); 450 if (input == -1) 451 err(1, "open(%s)", *filename); 452 if (fchmod(output, orig.st_mode & ~S_IFMT) == -1) 453 err(1, "chmod"); 454 buffer = malloc(orig.st_size); 455 if (buffer == NULL) 456 errx(1, "malloc failed"); 457 if (read(input, buffer, orig.st_size) == -1) 458 err(1, "read"); 459 if (write(output, buffer, orig.st_size) == -1) 460 err(1, "write"); 461 close(input); 462 close(output); 463 freopen(*filename, "w", stdout); 464 *filename = strdup(backup); 465 return 0; 466 } 467