1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson. 5 * Copyright (c) 1992 Diomidis Spinellis. 6 * Copyright (c) 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * Diomidis Spinellis of Imperial College, University of London. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #ifndef lint 41 static const char copyright[] = 42 "@(#) Copyright (c) 1992, 1993\n\ 43 The Regents of the University of California. All rights reserved.\n"; 44 #endif 45 46 #ifndef lint 47 static const char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94"; 48 #endif 49 50 #include <sys/types.h> 51 #include <sys/mman.h> 52 #include <sys/param.h> 53 #include <sys/stat.h> 54 55 #include <err.h> 56 #include <errno.h> 57 #include <fcntl.h> 58 #include <libgen.h> 59 #include <limits.h> 60 #include <locale.h> 61 #include <regex.h> 62 #include <stddef.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <string.h> 66 #include <unistd.h> 67 68 #include "defs.h" 69 #include "extern.h" 70 71 /* 72 * Linked list of units (strings and files) to be compiled 73 */ 74 struct s_compunit { 75 struct s_compunit *next; 76 enum e_cut {CU_FILE, CU_STRING} type; 77 char *s; /* Pointer to string or fname */ 78 }; 79 80 /* 81 * Linked list pointer to compilation units and pointer to current 82 * next pointer. 83 */ 84 static struct s_compunit *script, **cu_nextp = &script; 85 86 /* 87 * Linked list of files to be processed 88 */ 89 struct s_flist { 90 char *fname; 91 struct s_flist *next; 92 }; 93 94 /* 95 * Linked list pointer to files and pointer to current 96 * next pointer. 97 */ 98 static struct s_flist *files, **fl_nextp = &files; 99 100 FILE *infile; /* Current input file */ 101 FILE *outfile; /* Current output file */ 102 103 int aflag, eflag, nflag; 104 int rflags = 0; 105 int quit = 0; 106 static int rval; /* Exit status */ 107 108 static int ispan; /* Whether inplace editing spans across files */ 109 110 /* 111 * Current file and line number; line numbers restart across compilation 112 * units, but span across input files. The latter is optional if editing 113 * in place. 114 */ 115 const char *fname; /* File name. */ 116 const char *outfname; /* Output file name */ 117 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */ 118 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */ 119 const char *inplace; /* Inplace edit file extension. */ 120 u_long linenum; 121 122 static void add_compunit(enum e_cut, char *); 123 static void add_file(char *); 124 static void usage(void); 125 126 int 127 main(int argc, char *argv[]) 128 { 129 int c, fflag; 130 char *temp_arg; 131 132 (void) setlocale(LC_ALL, ""); 133 134 fflag = 0; 135 inplace = NULL; 136 137 while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1) 138 switch (c) { 139 case 'r': /* Gnu sed compat */ 140 case 'E': 141 rflags = REG_EXTENDED; 142 break; 143 case 'I': 144 inplace = optarg; 145 ispan = 1; /* span across input files */ 146 break; 147 case 'a': 148 aflag = 1; 149 break; 150 case 'e': 151 eflag = 1; 152 if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL) 153 err(1, "malloc"); 154 strcpy(temp_arg, optarg); 155 strcat(temp_arg, "\n"); 156 add_compunit(CU_STRING, temp_arg); 157 break; 158 case 'f': 159 fflag = 1; 160 add_compunit(CU_FILE, optarg); 161 break; 162 case 'i': 163 inplace = optarg; 164 ispan = 0; /* don't span across input files */ 165 break; 166 case 'l': 167 if(setvbuf(stdout, NULL, _IOLBF, 0) != 0) 168 warnx("setting line buffered output failed"); 169 break; 170 case 'n': 171 nflag = 1; 172 break; 173 case 'u': 174 if(setvbuf(stdout, NULL, _IONBF, 0) != 0) 175 warnx("setting unbuffered output failed"); 176 break; 177 default: 178 case '?': 179 usage(); 180 } 181 argc -= optind; 182 argv += optind; 183 184 /* First usage case; script is the first arg */ 185 if (!eflag && !fflag && *argv) { 186 add_compunit(CU_STRING, *argv); 187 argv++; 188 } 189 190 compile(); 191 192 /* Continue with first and start second usage */ 193 if (*argv) 194 for (; *argv; argv++) 195 add_file(*argv); 196 else 197 add_file(NULL); 198 process(); 199 cfclose(prog, NULL); 200 if (fclose(stdout)) 201 err(1, "stdout"); 202 exit(rval); 203 } 204 205 static void 206 usage(void) 207 { 208 (void)fprintf(stderr, 209 "usage: %s script [-Ealnru] [-i extension] [file ...]\n" 210 "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]" 211 " ... [file ...]\n", getprogname(), getprogname()); 212 exit(1); 213 } 214 215 /* 216 * Like fgets, but go through the chain of compilation units chaining them 217 * together. Empty strings and files are ignored. 218 */ 219 char * 220 cu_fgets(char *buf, int n, int *more) 221 { 222 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 223 static FILE *f; /* Current open file */ 224 static char *s; /* Current pointer inside string */ 225 static char string_ident[30]; 226 char *p; 227 228 again: 229 switch (state) { 230 case ST_EOF: 231 if (script == NULL) { 232 if (more != NULL) 233 *more = 0; 234 return (NULL); 235 } 236 linenum = 0; 237 switch (script->type) { 238 case CU_FILE: 239 if ((f = fopen(script->s, "r")) == NULL) 240 err(1, "%s", script->s); 241 fname = script->s; 242 state = ST_FILE; 243 goto again; 244 case CU_STRING: 245 if (((size_t)snprintf(string_ident, 246 sizeof(string_ident), "\"%s\"", script->s)) >= 247 sizeof(string_ident) - 1) 248 (void)strcpy(string_ident + 249 sizeof(string_ident) - 6, " ...\""); 250 fname = string_ident; 251 s = script->s; 252 state = ST_STRING; 253 goto again; 254 default: 255 __unreachable(); 256 } 257 case ST_FILE: 258 if ((p = fgets(buf, n, f)) != NULL) { 259 linenum++; 260 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 261 nflag = 1; 262 if (more != NULL) 263 *more = !feof(f); 264 return (p); 265 } 266 script = script->next; 267 (void)fclose(f); 268 state = ST_EOF; 269 goto again; 270 case ST_STRING: 271 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 272 nflag = 1; 273 p = buf; 274 for (;;) { 275 if (n-- <= 1) { 276 *p = '\0'; 277 linenum++; 278 if (more != NULL) 279 *more = 1; 280 return (buf); 281 } 282 switch (*s) { 283 case '\0': 284 state = ST_EOF; 285 if (s == script->s) { 286 script = script->next; 287 goto again; 288 } else { 289 script = script->next; 290 *p = '\0'; 291 linenum++; 292 if (more != NULL) 293 *more = 0; 294 return (buf); 295 } 296 case '\n': 297 *p++ = '\n'; 298 *p = '\0'; 299 s++; 300 linenum++; 301 if (more != NULL) 302 *more = 0; 303 return (buf); 304 default: 305 *p++ = *s++; 306 } 307 } 308 } 309 /* NOTREACHED */ 310 return (NULL); 311 } 312 313 /* 314 * Like fgets, but go through the list of files chaining them together. 315 * Set len to the length of the line. 316 */ 317 int 318 mf_fgets(SPACE *sp, enum e_spflag spflag) 319 { 320 struct stat sb; 321 ssize_t len; 322 char *dirbuf, *basebuf; 323 static char *p = NULL; 324 static size_t plen = 0; 325 int c; 326 static int firstfile; 327 328 if (infile == NULL) { 329 /* stdin? */ 330 if (files->fname == NULL) { 331 if (inplace != NULL) 332 errx(1, "-I or -i may not be used with stdin"); 333 infile = stdin; 334 fname = "stdin"; 335 outfile = stdout; 336 outfname = "stdout"; 337 } 338 firstfile = 1; 339 } 340 341 for (;;) { 342 if (infile != NULL && (c = getc(infile)) != EOF && !quit) { 343 (void)ungetc(c, infile); 344 break; 345 } 346 /* If we are here then either eof or no files are open yet */ 347 if (infile == stdin) { 348 sp->len = 0; 349 return (0); 350 } 351 if (infile != NULL) { 352 fclose(infile); 353 if (*oldfname != '\0') { 354 /* if there was a backup file, remove it */ 355 unlink(oldfname); 356 /* 357 * Backup the original. Note that hard links 358 * are not supported on all filesystems. 359 */ 360 if ((link(fname, oldfname) != 0) && 361 (rename(fname, oldfname) != 0)) { 362 warn("rename()"); 363 if (*tmpfname) 364 unlink(tmpfname); 365 exit(1); 366 } 367 *oldfname = '\0'; 368 } 369 if (*tmpfname != '\0') { 370 if (outfile != NULL && outfile != stdout) 371 if (fclose(outfile) != 0) { 372 warn("fclose()"); 373 unlink(tmpfname); 374 exit(1); 375 } 376 outfile = NULL; 377 if (rename(tmpfname, fname) != 0) { 378 /* this should not happen really! */ 379 warn("rename()"); 380 unlink(tmpfname); 381 exit(1); 382 } 383 *tmpfname = '\0'; 384 } 385 outfname = NULL; 386 } 387 if (firstfile == 0) 388 files = files->next; 389 else 390 firstfile = 0; 391 if (files == NULL) { 392 sp->len = 0; 393 return (0); 394 } 395 fname = files->fname; 396 if (inplace != NULL) { 397 if (lstat(fname, &sb) != 0) 398 err(1, "%s", fname); 399 if (!S_ISREG(sb.st_mode)) 400 errx(1, "%s: %s %s", fname, 401 "in-place editing only", 402 "works for regular files"); 403 if (*inplace != '\0') { 404 strlcpy(oldfname, fname, 405 sizeof(oldfname)); 406 len = strlcat(oldfname, inplace, 407 sizeof(oldfname)); 408 if (len > (ssize_t)sizeof(oldfname)) 409 errx(1, "%s: name too long", fname); 410 } 411 if ((dirbuf = strdup(fname)) == NULL || 412 (basebuf = strdup(fname)) == NULL) 413 err(1, "strdup"); 414 len = snprintf(tmpfname, sizeof(tmpfname), 415 "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(), 416 basename(basebuf)); 417 free(dirbuf); 418 free(basebuf); 419 if (len >= (ssize_t)sizeof(tmpfname)) 420 errx(1, "%s: name too long", fname); 421 unlink(tmpfname); 422 if (outfile != NULL && outfile != stdout) 423 fclose(outfile); 424 if ((outfile = fopen(tmpfname, "w")) == NULL) 425 err(1, "%s", fname); 426 fchown(fileno(outfile), sb.st_uid, sb.st_gid); 427 fchmod(fileno(outfile), sb.st_mode & ALLPERMS); 428 outfname = tmpfname; 429 if (!ispan) { 430 linenum = 0; 431 resetstate(); 432 } 433 } else { 434 outfile = stdout; 435 outfname = "stdout"; 436 } 437 if ((infile = fopen(fname, "r")) == NULL) { 438 warn("%s", fname); 439 rval = 1; 440 continue; 441 } 442 } 443 /* 444 * We are here only when infile is open and we still have something 445 * to read from it. 446 * 447 * Use getline() so that we can handle essentially infinite input 448 * data. The p and plen are static so each invocation gives 449 * getline() the same buffer which is expanded as needed. 450 */ 451 len = getline(&p, &plen, infile); 452 if (len == -1) 453 err(1, "%s", fname); 454 if (len != 0 && p[len - 1] == '\n') { 455 sp->append_newline = 1; 456 len--; 457 } else if (!lastline()) { 458 sp->append_newline = 1; 459 } else { 460 sp->append_newline = 0; 461 } 462 cspace(sp, p, len, spflag); 463 464 linenum++; 465 466 return (1); 467 } 468 469 /* 470 * Add a compilation unit to the linked list 471 */ 472 static void 473 add_compunit(enum e_cut type, char *s) 474 { 475 struct s_compunit *cu; 476 477 if ((cu = malloc(sizeof(struct s_compunit))) == NULL) 478 err(1, "malloc"); 479 cu->type = type; 480 cu->s = s; 481 cu->next = NULL; 482 *cu_nextp = cu; 483 cu_nextp = &cu->next; 484 } 485 486 /* 487 * Add a file to the linked list 488 */ 489 static void 490 add_file(char *s) 491 { 492 struct s_flist *fp; 493 494 if ((fp = malloc(sizeof(struct s_flist))) == NULL) 495 err(1, "malloc"); 496 fp->next = NULL; 497 *fl_nextp = fp; 498 fp->fname = s; 499 fl_nextp = &fp->next; 500 } 501 502 static int 503 next_files_have_lines(void) 504 { 505 struct s_flist *file; 506 FILE *file_fd; 507 int ch; 508 509 file = files; 510 while ((file = file->next) != NULL) { 511 if ((file_fd = fopen(file->fname, "r")) == NULL) 512 continue; 513 514 if ((ch = getc(file_fd)) != EOF) { 515 /* 516 * This next file has content, therefore current 517 * file doesn't contains the last line. 518 */ 519 ungetc(ch, file_fd); 520 fclose(file_fd); 521 return (1); 522 } 523 524 fclose(file_fd); 525 } 526 527 return (0); 528 } 529 530 int 531 lastline(void) 532 { 533 int ch; 534 535 if (feof(infile)) { 536 return !( 537 (inplace == NULL || ispan) && 538 next_files_have_lines()); 539 } 540 if ((ch = getc(infile)) == EOF) { 541 return !( 542 (inplace == NULL || ispan) && 543 next_files_have_lines()); 544 } 545 ungetc(ch, infile); 546 return (0); 547 } 548