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 1.2 2003/06/17 04:29:31 dillon 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(argc, argv) 112 int argc; 113 char *argv[]; 114 { 115 int c, fflag; 116 char *temp_arg; 117 118 (void) setlocale(LC_ALL, ""); 119 120 fflag = 0; 121 inplace = NULL; 122 123 while ((c = getopt(argc, argv, "Eae:f:i:n")) != -1) 124 switch (c) { 125 case 'E': 126 rflags = REG_EXTENDED; 127 break; 128 case 'a': 129 aflag = 1; 130 break; 131 case 'e': 132 eflag = 1; 133 if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL) 134 err(1, "malloc"); 135 strcpy(temp_arg, optarg); 136 strcat(temp_arg, "\n"); 137 add_compunit(CU_STRING, temp_arg); 138 break; 139 case 'f': 140 fflag = 1; 141 add_compunit(CU_FILE, optarg); 142 break; 143 case 'i': 144 inplace = optarg; 145 break; 146 case 'n': 147 nflag = 1; 148 break; 149 default: 150 case '?': 151 usage(); 152 } 153 argc -= optind; 154 argv += optind; 155 156 /* First usage case; script is the first arg */ 157 if (!eflag && !fflag && *argv) { 158 add_compunit(CU_STRING, *argv); 159 argv++; 160 } 161 162 compile(); 163 164 /* Continue with first and start second usage */ 165 if (*argv) 166 for (; *argv; argv++) 167 add_file(*argv); 168 else 169 add_file(NULL); 170 process(); 171 cfclose(prog, NULL); 172 if (fclose(stdout)) 173 err(1, "stdout"); 174 exit(rval); 175 } 176 177 static void 178 usage() 179 { 180 (void)fprintf(stderr, "%s\n%s\n", 181 "usage: sed script [-Ean] [-i extension] [file ...]", 182 " sed [-an] [-i extension] [-e script] ... [-f script_file] ... [file ...]"); 183 exit(1); 184 } 185 186 /* 187 * Like fgets, but go through the chain of compilation units chaining them 188 * together. Empty strings and files are ignored. 189 */ 190 char * 191 cu_fgets(buf, n, more) 192 char *buf; 193 int n; 194 int *more; 195 { 196 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 197 static FILE *f; /* Current open file */ 198 static char *s; /* Current pointer inside string */ 199 static char string_ident[30]; 200 char *p; 201 202 again: 203 switch (state) { 204 case ST_EOF: 205 if (script == NULL) { 206 if (more != NULL) 207 *more = 0; 208 return (NULL); 209 } 210 linenum = 0; 211 switch (script->type) { 212 case CU_FILE: 213 if ((f = fopen(script->s, "r")) == NULL) 214 err(1, "%s", script->s); 215 fname = script->s; 216 state = ST_FILE; 217 goto again; 218 case CU_STRING: 219 if ((snprintf(string_ident, 220 sizeof(string_ident), "\"%s\"", script->s)) >= 221 sizeof(string_ident) - 1) 222 (void)strcpy(string_ident + 223 sizeof(string_ident) - 6, " ...\""); 224 fname = string_ident; 225 s = script->s; 226 state = ST_STRING; 227 goto again; 228 } 229 case ST_FILE: 230 if ((p = fgets(buf, n, f)) != NULL) { 231 linenum++; 232 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 233 nflag = 1; 234 if (more != NULL) 235 *more = !feof(f); 236 return (p); 237 } 238 script = script->next; 239 (void)fclose(f); 240 state = ST_EOF; 241 goto again; 242 case ST_STRING: 243 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 244 nflag = 1; 245 p = buf; 246 for (;;) { 247 if (n-- <= 1) { 248 *p = '\0'; 249 linenum++; 250 if (more != NULL) 251 *more = 1; 252 return (buf); 253 } 254 switch (*s) { 255 case '\0': 256 state = ST_EOF; 257 if (s == script->s) { 258 script = script->next; 259 goto again; 260 } else { 261 script = script->next; 262 *p = '\0'; 263 linenum++; 264 if (more != NULL) 265 *more = 0; 266 return (buf); 267 } 268 case '\n': 269 *p++ = '\n'; 270 *p = '\0'; 271 s++; 272 linenum++; 273 if (more != NULL) 274 *more = 0; 275 return (buf); 276 default: 277 *p++ = *s++; 278 } 279 } 280 } 281 /* NOTREACHED */ 282 return (NULL); 283 } 284 285 /* 286 * Like fgets, but go through the list of files chaining them together. 287 * Set len to the length of the line. 288 */ 289 int 290 mf_fgets(sp, spflag) 291 SPACE *sp; 292 enum e_spflag spflag; 293 { 294 size_t len; 295 char *p; 296 int c; 297 static int firstfile; 298 299 if (curfile == NULL) { 300 /* stdin? */ 301 if (files->fname == NULL) { 302 if (inplace != NULL) 303 errx(1, "-i may not be used with stdin"); 304 curfile = stdin; 305 fname = "stdin"; 306 } 307 firstfile = 1; 308 } 309 310 for (;;) { 311 if (curfile != NULL && (c = getc(curfile)) != EOF) { 312 (void)ungetc(c, curfile); 313 break; 314 } 315 /* If we are here then either eof or no files are open yet */ 316 if (curfile == stdin) { 317 sp->len = 0; 318 return (0); 319 } 320 if (curfile != NULL) { 321 fclose(curfile); 322 } 323 if (firstfile == 0) { 324 files = files->next; 325 } else 326 firstfile = 0; 327 if (files == NULL) { 328 sp->len = 0; 329 return (0); 330 } 331 if (inplace != NULL) { 332 if (inplace_edit(&files->fname) == -1) 333 continue; 334 } 335 fname = files->fname; 336 if ((curfile = fopen(fname, "r")) == NULL) { 337 warn("%s", fname); 338 rval = 1; 339 continue; 340 } 341 if (inplace != NULL && *inplace == '\0') 342 unlink(fname); 343 } 344 /* 345 * We are here only when curfile is open and we still have something 346 * to read from it. 347 * 348 * Use fgetln so that we can handle essentially infinite input data. 349 * Can't use the pointer into the stdio buffer as the process space 350 * because the ungetc() can cause it to move. 351 */ 352 p = fgetln(curfile, &len); 353 if (ferror(curfile)) 354 errx(1, "%s: %s", fname, strerror(errno ? errno : EIO)); 355 if (len != 0 && p[len - 1] == '\n') 356 len--; 357 cspace(sp, p, len, spflag); 358 359 linenum++; 360 361 return (1); 362 } 363 364 /* 365 * Add a compilation unit to the linked list 366 */ 367 static void 368 add_compunit(type, s) 369 enum e_cut type; 370 char *s; 371 { 372 struct s_compunit *cu; 373 374 if ((cu = malloc(sizeof(struct s_compunit))) == NULL) 375 err(1, "malloc"); 376 cu->type = type; 377 cu->s = s; 378 cu->next = NULL; 379 *cu_nextp = cu; 380 cu_nextp = &cu->next; 381 } 382 383 /* 384 * Add a file to the linked list 385 */ 386 static void 387 add_file(s) 388 char *s; 389 { 390 struct s_flist *fp; 391 392 if ((fp = malloc(sizeof(struct s_flist))) == NULL) 393 err(1, "malloc"); 394 fp->next = NULL; 395 *fl_nextp = fp; 396 fp->fname = s; 397 fl_nextp = &fp->next; 398 } 399 400 /* 401 * Modify a pointer to a filename for inplace editing and reopen stdout 402 */ 403 static int 404 inplace_edit(filename) 405 char **filename; 406 { 407 struct stat orig; 408 char backup[MAXPATHLEN]; 409 410 if (lstat(*filename, &orig) == -1) 411 err(1, "lstat"); 412 if ((orig.st_mode & S_IFREG) == 0) { 413 warnx("cannot inplace edit %s, not a regular file", *filename); 414 return -1; 415 } 416 417 if (*inplace == '\0') { 418 /* 419 * This is a bit of a hack: we use mkstemp() to avoid the 420 * mktemp() link-time warning, although mktemp() would fit in 421 * this context much better. We're only interested in getting 422 * a name for use in the rename(); there aren't any security 423 * issues here that don't already exist in relation to the 424 * original file and its directory. 425 */ 426 int fd; 427 strlcpy(backup, *filename, sizeof(backup)); 428 strlcat(backup, ".XXXXXXXXXX", sizeof(backup)); 429 fd = mkstemp(backup); 430 if (fd == -1) 431 errx(1, "could not create backup of %s", *filename); 432 else 433 close(fd); 434 } else { 435 strlcpy(backup, *filename, sizeof(backup)); 436 strlcat(backup, inplace, sizeof(backup)); 437 } 438 439 if (rename(*filename, backup) == -1) 440 err(1, "rename(\"%s\", \"%s\")", *filename, backup); 441 if (freopen(*filename, "w", stdout) == NULL) 442 err(1, "open(\"%s\")", *filename); 443 if (fchmod(fileno(stdout), orig.st_mode) == -1) 444 err(1, "chmod(\"%s\")", *filename); 445 *filename = strdup(backup); 446 if (*filename == NULL) 447 err(1, "malloc"); 448 return 0; 449 } 450 451 int 452 lastline(void) 453 { 454 int ch; 455 456 if (files->next != NULL) 457 return (0); 458 if ((ch = getc(curfile)) == EOF) 459 return (1); 460 ungetc(ch, curfile); 461 return (0); 462 } 463