1 /*- 2 * Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson. 3 * Copyright (c) 1992 Diomidis Spinellis. 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Diomidis Spinellis of Imperial College, University of London. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California. All rights reserved. 35 * @(#)main.c 8.2 (Berkeley) 1/3/94 36 * $FreeBSD: head/usr.bin/sed/main.c 303662 2016-08-02 15:35:53Z pfg $ 37 */ 38 39 #include <sys/types.h> 40 #include <sys/mman.h> 41 #include <sys/param.h> 42 #include <sys/stat.h> 43 44 #include <err.h> 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <libgen.h> 48 #include <limits.h> 49 #include <locale.h> 50 #include <stddef.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 #include <regex.h> 56 57 #include "defs.h" 58 #include "extern.h" 59 60 /* 61 * Linked list of units (strings and files) to be compiled 62 */ 63 struct s_compunit { 64 struct s_compunit *next; 65 enum e_cut {CU_FILE, CU_STRING} type; 66 char *s; /* Pointer to string or fname */ 67 }; 68 69 /* 70 * Linked list pointer to compilation units and pointer to current 71 * next pointer. 72 */ 73 static struct s_compunit *script, **cu_nextp = &script; 74 75 /* 76 * Linked list of files to be processed 77 */ 78 struct s_flist { 79 char *fname; 80 struct s_flist *next; 81 }; 82 83 /* 84 * Linked list pointer to files and pointer to current 85 * next pointer. 86 */ 87 static struct s_flist *files, **fl_nextp = &files; 88 89 FILE *infile; /* Current input file */ 90 FILE *outfile; /* Current output file */ 91 92 int aflag, eflag, nflag; 93 int rflags = 0; 94 static int rval; /* Exit status */ 95 96 static int ispan; /* Whether inplace editing spans across files */ 97 98 /* 99 * Current file and line number; line numbers restart across compilation 100 * units, but span across input files. The latter is optional if editing 101 * in place. 102 */ 103 const char *fname; /* File name. */ 104 const char *outfname; /* Output file name */ 105 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */ 106 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */ 107 static const char *inplace; /* Inplace edit file extension. */ 108 u_long linenum; 109 110 static void add_compunit(enum e_cut, char *); 111 static void add_file(char *); 112 static void usage(void); 113 114 int 115 main(int argc, char *argv[]) 116 { 117 int c, fflag; 118 char *temp_arg; 119 120 (void) setlocale(LC_ALL, ""); 121 122 fflag = 0; 123 inplace = NULL; 124 125 while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1) 126 switch (c) { 127 case 'r': /* GNU sed compat */ 128 case 'E': 129 rflags = REG_EXTENDED; 130 break; 131 case 'I': 132 inplace = optarg; 133 ispan = 1; /* span across input files */ 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 ispan = 0; /* don't span across input files */ 153 break; 154 case 'l': 155 if(setvbuf(stdout, NULL, _IOLBF, 0) != 0) 156 warnx("setting line buffered output failed"); 157 break; 158 case 'n': 159 nflag = 1; 160 break; 161 case 'u': 162 if(setvbuf(stdout, NULL, _IONBF, 0) != 0) 163 warnx("setting unbuffered output failed"); 164 break; 165 default: 166 case '?': 167 usage(); 168 } 169 argc -= optind; 170 argv += optind; 171 172 /* First usage case; script is the first arg */ 173 if (!eflag && !fflag && *argv) { 174 add_compunit(CU_STRING, *argv); 175 argv++; 176 } 177 178 compile(); 179 180 /* Continue with first and start second usage */ 181 if (*argv) 182 for (; *argv; argv++) 183 add_file(*argv); 184 else 185 add_file(NULL); 186 process(); 187 cfclose(prog, NULL); 188 if (fclose(stdout)) 189 err(1, "stdout"); 190 exit(rval); 191 } 192 193 static void 194 usage(void) 195 { 196 (void)fprintf(stderr, 197 "usage: %s script [-Ealnru] [-i extension] [file ...]\n" 198 "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]" 199 " ... [file ...]\n", getprogname(), getprogname()); 200 exit(1); 201 } 202 203 /* 204 * Like fgets, but go through the chain of compilation units chaining them 205 * together. Empty strings and files are ignored. 206 */ 207 char * 208 cu_fgets(char *buf, int n, int *more) 209 { 210 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 211 static FILE *f; /* Current open file */ 212 static char *s; /* Current pointer inside string */ 213 static char string_ident[30]; 214 char *p; 215 216 again: 217 switch (state) { 218 case ST_EOF: 219 if (script == NULL) { 220 if (more != NULL) 221 *more = 0; 222 return (NULL); 223 } 224 linenum = 0; 225 switch (script->type) { 226 case CU_FILE: 227 if ((f = fopen(script->s, "r")) == NULL) 228 err(1, "%s", script->s); 229 fname = script->s; 230 state = ST_FILE; 231 goto again; 232 case CU_STRING: 233 if (((size_t)snprintf(string_ident, 234 sizeof(string_ident), "\"%s\"", script->s)) >= 235 sizeof(string_ident) - 1) 236 (void)strcpy(string_ident + 237 sizeof(string_ident) - 6, " ...\""); 238 fname = string_ident; 239 s = script->s; 240 state = ST_STRING; 241 goto again; 242 default: 243 errx(1, "illegal script type: %d", script->type); 244 } 245 case ST_FILE: 246 if ((p = fgets(buf, n, f)) != NULL) { 247 linenum++; 248 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 249 nflag = 1; 250 if (more != NULL) 251 *more = !feof(f); 252 return (p); 253 } 254 script = script->next; 255 (void)fclose(f); 256 state = ST_EOF; 257 goto again; 258 case ST_STRING: 259 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 260 nflag = 1; 261 p = buf; 262 for (;;) { 263 if (n-- <= 1) { 264 *p = '\0'; 265 linenum++; 266 if (more != NULL) 267 *more = 1; 268 return (buf); 269 } 270 switch (*s) { 271 case '\0': 272 state = ST_EOF; 273 if (s == script->s) { 274 script = script->next; 275 goto again; 276 } else { 277 script = script->next; 278 *p = '\0'; 279 linenum++; 280 if (more != NULL) 281 *more = 0; 282 return (buf); 283 } 284 case '\n': 285 *p++ = '\n'; 286 *p = '\0'; 287 s++; 288 linenum++; 289 if (more != NULL) 290 *more = 0; 291 return (buf); 292 default: 293 *p++ = *s++; 294 } 295 } 296 } 297 /* NOTREACHED */ 298 return (NULL); 299 } 300 301 /* 302 * Like fgets, but go through the list of files chaining them together. 303 * Set len to the length of the line. 304 */ 305 int 306 mf_fgets(SPACE *sp, enum e_spflag spflag) 307 { 308 struct stat sb; 309 ssize_t len; 310 char *dirbuf, *basebuf; 311 static char *p = NULL; 312 static size_t plen = 0; 313 int c; 314 static int firstfile; 315 316 if (infile == NULL) { 317 /* stdin? */ 318 if (files->fname == NULL) { 319 if (inplace != NULL) 320 errx(1, "-I or -i may not be used with stdin"); 321 infile = stdin; 322 fname = "stdin"; 323 outfile = stdout; 324 outfname = "stdout"; 325 } 326 firstfile = 1; 327 } 328 329 for (;;) { 330 if (infile != NULL && (c = getc(infile)) != EOF) { 331 (void)ungetc(c, infile); 332 break; 333 } 334 /* If we are here then either eof or no files are open yet */ 335 if (infile == stdin) { 336 sp->len = 0; 337 return (0); 338 } 339 if (infile != NULL) { 340 fclose(infile); 341 if (*oldfname != '\0') { 342 /* if there was a backup file, remove it */ 343 unlink(oldfname); 344 /* 345 * Backup the original. Note that hard links 346 * are not supported on all filesystems. 347 */ 348 if ((link(fname, oldfname) != 0) && 349 (rename(fname, oldfname) != 0)) { 350 warn("rename()"); 351 if (*tmpfname) 352 unlink(tmpfname); 353 exit(1); 354 } 355 *oldfname = '\0'; 356 } 357 if (*tmpfname != '\0') { 358 if (outfile != NULL && outfile != stdout) 359 if (fclose(outfile) != 0) { 360 warn("fclose()"); 361 unlink(tmpfname); 362 exit(1); 363 } 364 outfile = NULL; 365 if (rename(tmpfname, fname) != 0) { 366 /* this should not happen really! */ 367 warn("rename()"); 368 unlink(tmpfname); 369 exit(1); 370 } 371 *tmpfname = '\0'; 372 } 373 outfname = NULL; 374 } 375 if (firstfile == 0) 376 files = files->next; 377 else 378 firstfile = 0; 379 if (files == NULL) { 380 sp->len = 0; 381 return (0); 382 } 383 fname = files->fname; 384 if (inplace != NULL) { 385 if (lstat(fname, &sb) != 0) 386 err(1, "%s", fname); 387 if (!(sb.st_mode & S_IFREG)) 388 errx(1, "%s: %s %s", fname, 389 "in-place editing only", 390 "works for regular files"); 391 if (*inplace != '\0') { 392 strlcpy(oldfname, fname, 393 sizeof(oldfname)); 394 len = strlcat(oldfname, inplace, 395 sizeof(oldfname)); 396 if (len > (ssize_t)sizeof(oldfname)) 397 errx(1, "%s: name too long", fname); 398 } 399 if ((dirbuf = strdup(fname)) == NULL || 400 (basebuf = strdup(fname)) == NULL) 401 err(1, "strdup"); 402 len = snprintf(tmpfname, sizeof(tmpfname), 403 "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(), 404 basename(basebuf)); 405 free(dirbuf); 406 free(basebuf); 407 if (len >= (ssize_t)sizeof(tmpfname)) 408 errx(1, "%s: name too long", fname); 409 unlink(tmpfname); 410 if (outfile != NULL && outfile != stdout) 411 fclose(outfile); 412 if ((outfile = fopen(tmpfname, "w")) == NULL) 413 err(1, "%s", fname); 414 fchown(fileno(outfile), sb.st_uid, sb.st_gid); 415 fchmod(fileno(outfile), sb.st_mode & ALLPERMS); 416 outfname = tmpfname; 417 if (!ispan) { 418 linenum = 0; 419 resetstate(); 420 } 421 } else { 422 outfile = stdout; 423 outfname = "stdout"; 424 } 425 if ((infile = fopen(fname, "r")) == NULL) { 426 warn("%s", fname); 427 rval = 1; 428 continue; 429 } 430 } 431 /* 432 * We are here only when infile is open and we still have something 433 * to read from it. 434 * 435 * Use getline() so that we can handle essentially infinite input 436 * data. The p and plen are static so each invocation gives 437 * getline() the same buffer which is expanded as needed. 438 */ 439 len = getline(&p, &plen, infile); 440 if (len == -1) 441 err(1, "%s", fname); 442 if (len != 0 && p[len - 1] == '\n') { 443 sp->append_newline = 1; 444 len--; 445 } else if (!lastline()) { 446 sp->append_newline = 1; 447 } else { 448 sp->append_newline = 0; 449 } 450 cspace(sp, p, len, spflag); 451 452 linenum++; 453 454 return (1); 455 } 456 457 /* 458 * Add a compilation unit to the linked list 459 */ 460 static void 461 add_compunit(enum e_cut type, char *s) 462 { 463 struct s_compunit *cu; 464 465 if ((cu = malloc(sizeof(struct s_compunit))) == NULL) 466 err(1, "malloc"); 467 cu->type = type; 468 cu->s = s; 469 cu->next = NULL; 470 *cu_nextp = cu; 471 cu_nextp = &cu->next; 472 } 473 474 /* 475 * Add a file to the linked list 476 */ 477 static void 478 add_file(char *s) 479 { 480 struct s_flist *fp; 481 482 if ((fp = malloc(sizeof(struct s_flist))) == NULL) 483 err(1, "malloc"); 484 fp->next = NULL; 485 *fl_nextp = fp; 486 fp->fname = s; 487 fl_nextp = &fp->next; 488 } 489 490 static int 491 next_files_have_lines(void) 492 { 493 struct s_flist *file; 494 FILE *file_fd; 495 int ch; 496 497 file = files; 498 while ((file = file->next) != NULL) { 499 if ((file_fd = fopen(file->fname, "r")) == NULL) 500 continue; 501 502 if ((ch = getc(file_fd)) != EOF) { 503 /* 504 * This next file has content, therefore current 505 * file doesn't contains the last line. 506 */ 507 ungetc(ch, file_fd); 508 fclose(file_fd); 509 return (1); 510 } 511 512 fclose(file_fd); 513 } 514 515 return (0); 516 } 517 518 int 519 lastline(void) 520 { 521 int ch; 522 523 if (feof(infile)) { 524 return !( 525 (inplace == NULL || ispan) && 526 next_files_have_lines()); 527 } 528 if ((ch = getc(infile)) == EOF) { 529 return !( 530 (inplace == NULL || ispan) && 531 next_files_have_lines()); 532 } 533 ungetc(ch, infile); 534 return (0); 535 } 536