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 #ifndef lint 39 static const char copyright[] = 40 "@(#) Copyright (c) 1992, 1993\n\ 41 The Regents of the University of California. All rights reserved.\n"; 42 #endif 43 44 #ifndef lint 45 static const char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94"; 46 #endif 47 48 #include <sys/types.h> 49 #include <sys/mman.h> 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 53 #include <err.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <libgen.h> 57 #include <limits.h> 58 #include <locale.h> 59 #include <regex.h> 60 #include <stddef.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 66 #include "defs.h" 67 #include "extern.h" 68 69 /* 70 * Linked list of units (strings and files) to be compiled 71 */ 72 struct s_compunit { 73 struct s_compunit *next; 74 enum e_cut {CU_FILE, CU_STRING} type; 75 char *s; /* Pointer to string or fname */ 76 }; 77 78 /* 79 * Linked list pointer to compilation units and pointer to current 80 * next pointer. 81 */ 82 static struct s_compunit *script, **cu_nextp = &script; 83 84 /* 85 * Linked list of files to be processed 86 */ 87 struct s_flist { 88 char *fname; 89 struct s_flist *next; 90 }; 91 92 /* 93 * Linked list pointer to files and pointer to current 94 * next pointer. 95 */ 96 static struct s_flist *files, **fl_nextp = &files; 97 98 FILE *infile; /* Current input file */ 99 FILE *outfile; /* Current output file */ 100 101 int aflag, eflag, nflag; 102 int rflags = 0; 103 int quit = 0; 104 static int rval; /* Exit status */ 105 106 static int ispan; /* Whether inplace editing spans across files */ 107 108 /* 109 * Current file and line number; line numbers restart across compilation 110 * units, but span across input files. The latter is optional if editing 111 * in place. 112 */ 113 const char *fname; /* File name. */ 114 const char *outfname; /* Output file name */ 115 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */ 116 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */ 117 const char *inplace; /* Inplace edit file extension. */ 118 u_long linenum; 119 120 static void add_compunit(enum e_cut, char *); 121 static void add_file(char *); 122 static void usage(void) __dead2; 123 124 int 125 main(int argc, char *argv[]) 126 { 127 int c, fflag, fflagstdin; 128 char *temp_arg; 129 130 (void) setlocale(LC_ALL, ""); 131 132 fflag = 0; 133 fflagstdin = 0; 134 inplace = NULL; 135 136 while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1) 137 switch (c) { 138 case 'r': /* Gnu sed compat */ 139 case 'E': 140 rflags = REG_EXTENDED; 141 break; 142 case 'I': 143 inplace = optarg; 144 ispan = 1; /* span across input files */ 145 break; 146 case 'a': 147 aflag = 1; 148 break; 149 case 'e': 150 eflag = 1; 151 if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL) 152 err(1, "malloc"); 153 strcpy(temp_arg, optarg); 154 strcat(temp_arg, "\n"); 155 add_compunit(CU_STRING, temp_arg); 156 break; 157 case 'f': 158 fflag = 1; 159 if (strcmp(optarg, "-") == 0) 160 fflagstdin = 1; 161 add_compunit(CU_FILE, optarg); 162 break; 163 case 'i': 164 inplace = optarg; 165 ispan = 0; /* don't span across input files */ 166 break; 167 case 'l': 168 if(setvbuf(stdout, NULL, _IOLBF, 0) != 0) 169 warnx("setting line buffered output failed"); 170 break; 171 case 'n': 172 nflag = 1; 173 break; 174 case 'u': 175 if(setvbuf(stdout, NULL, _IONBF, 0) != 0) 176 warnx("setting unbuffered output failed"); 177 break; 178 default: 179 case '?': 180 usage(); 181 } 182 argc -= optind; 183 argv += optind; 184 185 /* First usage case; script is the first arg */ 186 if (!eflag && !fflag && *argv) { 187 add_compunit(CU_STRING, *argv); 188 argv++; 189 } 190 191 compile(); 192 193 /* Continue with first and start second usage */ 194 if (*argv) 195 for (; *argv; argv++) 196 add_file(*argv); 197 else if (fflagstdin) 198 exit(rval); 199 else 200 add_file(NULL); 201 process(); 202 cfclose(prog, NULL); 203 if (fclose(stdout)) 204 err(1, "stdout"); 205 exit(rval); 206 } 207 208 static void 209 usage(void) 210 { 211 (void)fprintf(stderr, 212 "usage: %s script [-Ealnru] [-i extension] [file ...]\n" 213 "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]" 214 " ... [file ...]\n", getprogname(), getprogname()); 215 exit(1); 216 } 217 218 /* 219 * Like fgets, but go through the chain of compilation units chaining them 220 * together. Empty strings and files are ignored. 221 */ 222 char * 223 cu_fgets(char *buf, int n, int *more) 224 { 225 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 226 static FILE *f; /* Current open file */ 227 static char *s; /* Current pointer inside string */ 228 static char string_ident[30]; 229 char *p; 230 231 again: 232 switch (state) { 233 case ST_EOF: 234 if (script == NULL) { 235 if (more != NULL) 236 *more = 0; 237 return (NULL); 238 } 239 linenum = 0; 240 switch (script->type) { 241 case CU_FILE: 242 if (strcmp(script->s, "-") == 0) { 243 f = stdin; 244 fname = "stdin"; 245 } else { 246 if ((f = fopen(script->s, "r")) == NULL) 247 err(1, "%s", script->s); 248 fname = script->s; 249 } 250 state = ST_FILE; 251 goto again; 252 case CU_STRING: 253 if (((size_t)snprintf(string_ident, 254 sizeof(string_ident), "\"%s\"", script->s)) >= 255 sizeof(string_ident) - 1) 256 (void)strcpy(string_ident + 257 sizeof(string_ident) - 6, " ...\""); 258 fname = string_ident; 259 s = script->s; 260 state = ST_STRING; 261 goto again; 262 default: 263 __unreachable(); 264 } 265 case ST_FILE: 266 if ((p = fgets(buf, n, f)) != NULL) { 267 linenum++; 268 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 269 nflag = 1; 270 if (more != NULL) 271 *more = !feof(f); 272 return (p); 273 } 274 script = script->next; 275 (void)fclose(f); 276 state = ST_EOF; 277 goto again; 278 case ST_STRING: 279 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 280 nflag = 1; 281 p = buf; 282 for (;;) { 283 if (n-- <= 1) { 284 *p = '\0'; 285 linenum++; 286 if (more != NULL) 287 *more = 1; 288 return (buf); 289 } 290 switch (*s) { 291 case '\0': 292 state = ST_EOF; 293 if (s == script->s) { 294 script = script->next; 295 goto again; 296 } else { 297 script = script->next; 298 *p = '\0'; 299 linenum++; 300 if (more != NULL) 301 *more = 0; 302 return (buf); 303 } 304 case '\n': 305 *p++ = '\n'; 306 *p = '\0'; 307 s++; 308 linenum++; 309 if (more != NULL) 310 *more = 0; 311 return (buf); 312 default: 313 *p++ = *s++; 314 } 315 } 316 } 317 /* NOTREACHED */ 318 return (NULL); 319 } 320 321 /* 322 * Like fgets, but go through the list of files chaining them together. 323 * Set len to the length of the line. 324 */ 325 int 326 mf_fgets(SPACE *sp, enum e_spflag spflag) 327 { 328 struct stat sb; 329 ssize_t len; 330 char *dirbuf, *basebuf; 331 static char *p = NULL; 332 static size_t plen = 0; 333 int c; 334 static int firstfile; 335 336 if (infile == NULL) { 337 /* stdin? */ 338 if (files->fname == NULL) { 339 if (inplace != NULL) 340 errx(1, "-I or -i may not be used with stdin"); 341 infile = stdin; 342 fname = "stdin"; 343 outfile = stdout; 344 outfname = "stdout"; 345 } 346 firstfile = 1; 347 } 348 349 for (;;) { 350 if (infile != NULL && (c = getc(infile)) != EOF && !quit) { 351 (void)ungetc(c, infile); 352 break; 353 } 354 /* If we are here then either eof or no files are open yet */ 355 if (infile == stdin) { 356 sp->len = 0; 357 return (0); 358 } 359 if (infile != NULL) { 360 fclose(infile); 361 if (*oldfname != '\0') { 362 /* if there was a backup file, remove it */ 363 unlink(oldfname); 364 /* 365 * Backup the original. Note that hard links 366 * are not supported on all filesystems. 367 */ 368 if ((link(fname, oldfname) != 0) && 369 (rename(fname, oldfname) != 0)) { 370 warn("rename()"); 371 if (*tmpfname) 372 unlink(tmpfname); 373 exit(1); 374 } 375 *oldfname = '\0'; 376 } 377 if (*tmpfname != '\0') { 378 if (outfile != NULL && outfile != stdout) 379 if (fclose(outfile) != 0) { 380 warn("fclose()"); 381 unlink(tmpfname); 382 exit(1); 383 } 384 outfile = NULL; 385 if (rename(tmpfname, fname) != 0) { 386 /* this should not happen really! */ 387 warn("rename()"); 388 unlink(tmpfname); 389 exit(1); 390 } 391 *tmpfname = '\0'; 392 } 393 outfname = NULL; 394 } 395 if (firstfile == 0) 396 files = files->next; 397 else 398 firstfile = 0; 399 if (files == NULL) { 400 sp->len = 0; 401 return (0); 402 } 403 fname = files->fname; 404 if (inplace != NULL) { 405 if (lstat(fname, &sb) != 0) 406 err(1, "%s", fname); 407 if (!S_ISREG(sb.st_mode)) 408 errx(1, "%s: %s %s", fname, 409 "in-place editing only", 410 "works for regular files"); 411 if (*inplace != '\0') { 412 strlcpy(oldfname, fname, 413 sizeof(oldfname)); 414 len = strlcat(oldfname, inplace, 415 sizeof(oldfname)); 416 if (len > (ssize_t)sizeof(oldfname)) 417 errx(1, "%s: name too long", fname); 418 } 419 if ((dirbuf = strdup(fname)) == NULL || 420 (basebuf = strdup(fname)) == NULL) 421 err(1, "strdup"); 422 len = snprintf(tmpfname, sizeof(tmpfname), 423 "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(), 424 basename(basebuf)); 425 free(dirbuf); 426 free(basebuf); 427 if (len >= (ssize_t)sizeof(tmpfname)) 428 errx(1, "%s: name too long", fname); 429 unlink(tmpfname); 430 if (outfile != NULL && outfile != stdout) 431 fclose(outfile); 432 if ((outfile = fopen(tmpfname, "w")) == NULL) 433 err(1, "%s", fname); 434 fchown(fileno(outfile), sb.st_uid, sb.st_gid); 435 fchmod(fileno(outfile), sb.st_mode & ALLPERMS); 436 outfname = tmpfname; 437 if (!ispan) { 438 linenum = 0; 439 resetstate(); 440 } 441 } else { 442 outfile = stdout; 443 outfname = "stdout"; 444 } 445 if ((infile = fopen(fname, "r")) == NULL) { 446 warn("%s", fname); 447 rval = 1; 448 continue; 449 } 450 } 451 /* 452 * We are here only when infile is open and we still have something 453 * to read from it. 454 * 455 * Use getline() so that we can handle essentially infinite input 456 * data. The p and plen are static so each invocation gives 457 * getline() the same buffer which is expanded as needed. 458 */ 459 len = getline(&p, &plen, infile); 460 if (len == -1) 461 err(1, "%s", fname); 462 if (len != 0 && p[len - 1] == '\n') { 463 sp->append_newline = 1; 464 len--; 465 } else if (!lastline()) { 466 sp->append_newline = 1; 467 } else { 468 sp->append_newline = 0; 469 } 470 cspace(sp, p, len, spflag); 471 472 linenum++; 473 474 return (1); 475 } 476 477 /* 478 * Add a compilation unit to the linked list 479 */ 480 static void 481 add_compunit(enum e_cut type, char *s) 482 { 483 struct s_compunit *cu; 484 485 if ((cu = malloc(sizeof(struct s_compunit))) == NULL) 486 err(1, "malloc"); 487 cu->type = type; 488 cu->s = s; 489 cu->next = NULL; 490 *cu_nextp = cu; 491 cu_nextp = &cu->next; 492 } 493 494 /* 495 * Add a file to the linked list 496 */ 497 static void 498 add_file(char *s) 499 { 500 struct s_flist *fp; 501 502 if ((fp = malloc(sizeof(struct s_flist))) == NULL) 503 err(1, "malloc"); 504 fp->next = NULL; 505 *fl_nextp = fp; 506 fp->fname = s; 507 fl_nextp = &fp->next; 508 } 509 510 static int 511 next_files_have_lines(void) 512 { 513 struct s_flist *file; 514 FILE *file_fd; 515 int ch; 516 517 file = files; 518 while ((file = file->next) != NULL) { 519 if ((file_fd = fopen(file->fname, "r")) == NULL) 520 continue; 521 522 if ((ch = getc(file_fd)) != EOF) { 523 /* 524 * This next file has content, therefore current 525 * file doesn't contains the last line. 526 */ 527 ungetc(ch, file_fd); 528 fclose(file_fd); 529 return (1); 530 } 531 532 fclose(file_fd); 533 } 534 535 return (0); 536 } 537 538 int 539 lastline(void) 540 { 541 int ch; 542 543 if (feof(infile)) { 544 return !( 545 (inplace == NULL || ispan) && 546 next_files_have_lines()); 547 } 548 if ((ch = getc(infile)) == EOF) { 549 return !( 550 (inplace == NULL || ispan) && 551 next_files_have_lines()); 552 } 553 ungetc(ch, infile); 554 return (0); 555 } 556