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 * 4. 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 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 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 static int rval; /* Exit status */ 104 105 static int ispan; /* Whether inplace editing spans across files */ 106 107 /* 108 * Current file and line number; line numbers restart across compilation 109 * units, but span across input files. The latter is optional if editing 110 * in place. 111 */ 112 const char *fname; /* File name. */ 113 const char *outfname; /* Output file name */ 114 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */ 115 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */ 116 static const char *inplace; /* Inplace edit file extension. */ 117 u_long linenum; 118 119 static void add_compunit(enum e_cut, char *); 120 static void add_file(char *); 121 static void usage(void); 122 123 int 124 main(int argc, char *argv[]) 125 { 126 int c, fflag; 127 char *temp_arg; 128 129 (void) setlocale(LC_ALL, ""); 130 131 fflag = 0; 132 inplace = NULL; 133 134 while ((c = getopt(argc, argv, "EI:ae:f:i:lnru")) != -1) 135 switch (c) { 136 case 'r': /* Gnu sed compat */ 137 case 'E': 138 rflags = REG_EXTENDED; 139 break; 140 case 'I': 141 inplace = optarg; 142 ispan = 1; /* span across input files */ 143 break; 144 case 'a': 145 aflag = 1; 146 break; 147 case 'e': 148 eflag = 1; 149 if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL) 150 err(1, "malloc"); 151 strcpy(temp_arg, optarg); 152 strcat(temp_arg, "\n"); 153 add_compunit(CU_STRING, temp_arg); 154 break; 155 case 'f': 156 fflag = 1; 157 add_compunit(CU_FILE, optarg); 158 break; 159 case 'i': 160 inplace = optarg; 161 ispan = 0; /* don't span across input files */ 162 break; 163 case 'l': 164 if(setvbuf(stdout, NULL, _IOLBF, 0) != 0) 165 warnx("setting line buffered output failed"); 166 break; 167 case 'n': 168 nflag = 1; 169 break; 170 case 'u': 171 if(setvbuf(stdout, NULL, _IONBF, 0) != 0) 172 warnx("setting unbuffered output failed"); 173 break; 174 default: 175 case '?': 176 usage(); 177 } 178 argc -= optind; 179 argv += optind; 180 181 /* First usage case; script is the first arg */ 182 if (!eflag && !fflag && *argv) { 183 add_compunit(CU_STRING, *argv); 184 argv++; 185 } 186 187 compile(); 188 189 /* Continue with first and start second usage */ 190 if (*argv) 191 for (; *argv; argv++) 192 add_file(*argv); 193 else 194 add_file(NULL); 195 process(); 196 cfclose(prog, NULL); 197 if (fclose(stdout)) 198 err(1, "stdout"); 199 exit(rval); 200 } 201 202 static void 203 usage(void) 204 { 205 (void)fprintf(stderr, 206 "usage: %s script [-Ealnru] [-i extension] [file ...]\n" 207 "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]" 208 " ... [file ...]\n", getprogname(), getprogname()); 209 exit(1); 210 } 211 212 /* 213 * Like fgets, but go through the chain of compilation units chaining them 214 * together. Empty strings and files are ignored. 215 */ 216 char * 217 cu_fgets(char *buf, int n, int *more) 218 { 219 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 220 static FILE *f; /* Current open file */ 221 static char *s; /* Current pointer inside string */ 222 static char string_ident[30]; 223 char *p; 224 225 again: 226 switch (state) { 227 case ST_EOF: 228 if (script == NULL) { 229 if (more != NULL) 230 *more = 0; 231 return (NULL); 232 } 233 linenum = 0; 234 switch (script->type) { 235 case CU_FILE: 236 if ((f = fopen(script->s, "r")) == NULL) 237 err(1, "%s", script->s); 238 fname = script->s; 239 state = ST_FILE; 240 goto again; 241 case CU_STRING: 242 if (((size_t)snprintf(string_ident, 243 sizeof(string_ident), "\"%s\"", script->s)) >= 244 sizeof(string_ident) - 1) 245 (void)strcpy(string_ident + 246 sizeof(string_ident) - 6, " ...\""); 247 fname = string_ident; 248 s = script->s; 249 state = ST_STRING; 250 goto again; 251 } 252 case ST_FILE: 253 if ((p = fgets(buf, n, f)) != NULL) { 254 linenum++; 255 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 256 nflag = 1; 257 if (more != NULL) 258 *more = !feof(f); 259 return (p); 260 } 261 script = script->next; 262 (void)fclose(f); 263 state = ST_EOF; 264 goto again; 265 case ST_STRING: 266 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 267 nflag = 1; 268 p = buf; 269 for (;;) { 270 if (n-- <= 1) { 271 *p = '\0'; 272 linenum++; 273 if (more != NULL) 274 *more = 1; 275 return (buf); 276 } 277 switch (*s) { 278 case '\0': 279 state = ST_EOF; 280 if (s == script->s) { 281 script = script->next; 282 goto again; 283 } else { 284 script = script->next; 285 *p = '\0'; 286 linenum++; 287 if (more != NULL) 288 *more = 0; 289 return (buf); 290 } 291 case '\n': 292 *p++ = '\n'; 293 *p = '\0'; 294 s++; 295 linenum++; 296 if (more != NULL) 297 *more = 0; 298 return (buf); 299 default: 300 *p++ = *s++; 301 } 302 } 303 } 304 /* NOTREACHED */ 305 return (NULL); 306 } 307 308 /* 309 * Like fgets, but go through the list of files chaining them together. 310 * Set len to the length of the line. 311 */ 312 int 313 mf_fgets(SPACE *sp, enum e_spflag spflag) 314 { 315 struct stat sb; 316 ssize_t len; 317 char *dirbuf, *basebuf; 318 static char *p = NULL; 319 static size_t plen = 0; 320 int c; 321 static int firstfile; 322 323 if (infile == NULL) { 324 /* stdin? */ 325 if (files->fname == NULL) { 326 if (inplace != NULL) 327 errx(1, "-I or -i may not be used with stdin"); 328 infile = stdin; 329 fname = "stdin"; 330 outfile = stdout; 331 outfname = "stdout"; 332 } 333 firstfile = 1; 334 } 335 336 for (;;) { 337 if (infile != NULL && (c = getc(infile)) != EOF) { 338 (void)ungetc(c, infile); 339 break; 340 } 341 /* If we are here then either eof or no files are open yet */ 342 if (infile == stdin) { 343 sp->len = 0; 344 return (0); 345 } 346 if (infile != NULL) { 347 fclose(infile); 348 if (*oldfname != '\0') { 349 /* if there was a backup file, remove it */ 350 unlink(oldfname); 351 /* 352 * Backup the original. Note that hard links 353 * are not supported on all filesystems. 354 */ 355 if ((link(fname, oldfname) != 0) && 356 (rename(fname, oldfname) != 0)) { 357 warn("rename()"); 358 if (*tmpfname) 359 unlink(tmpfname); 360 exit(1); 361 } 362 *oldfname = '\0'; 363 } 364 if (*tmpfname != '\0') { 365 if (outfile != NULL && outfile != stdout) 366 if (fclose(outfile) != 0) { 367 warn("fclose()"); 368 unlink(tmpfname); 369 exit(1); 370 } 371 outfile = NULL; 372 if (rename(tmpfname, fname) != 0) { 373 /* this should not happen really! */ 374 warn("rename()"); 375 unlink(tmpfname); 376 exit(1); 377 } 378 *tmpfname = '\0'; 379 } 380 outfname = NULL; 381 } 382 if (firstfile == 0) 383 files = files->next; 384 else 385 firstfile = 0; 386 if (files == NULL) { 387 sp->len = 0; 388 return (0); 389 } 390 fname = files->fname; 391 if (inplace != NULL) { 392 if (lstat(fname, &sb) != 0) 393 err(1, "%s", fname); 394 if (!(sb.st_mode & S_IFREG)) 395 errx(1, "%s: %s %s", fname, 396 "in-place editing only", 397 "works for regular files"); 398 if (*inplace != '\0') { 399 strlcpy(oldfname, fname, 400 sizeof(oldfname)); 401 len = strlcat(oldfname, inplace, 402 sizeof(oldfname)); 403 if (len > (ssize_t)sizeof(oldfname)) 404 errx(1, "%s: name too long", fname); 405 } 406 if ((dirbuf = strdup(fname)) == NULL || 407 (basebuf = strdup(fname)) == NULL) 408 err(1, "strdup"); 409 len = snprintf(tmpfname, sizeof(tmpfname), 410 "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(), 411 basename(basebuf)); 412 free(dirbuf); 413 free(basebuf); 414 if (len >= (ssize_t)sizeof(tmpfname)) 415 errx(1, "%s: name too long", fname); 416 unlink(tmpfname); 417 if (outfile != NULL && outfile != stdout) 418 fclose(outfile); 419 if ((outfile = fopen(tmpfname, "w")) == NULL) 420 err(1, "%s", fname); 421 fchown(fileno(outfile), sb.st_uid, sb.st_gid); 422 fchmod(fileno(outfile), sb.st_mode & ALLPERMS); 423 outfname = tmpfname; 424 if (!ispan) { 425 linenum = 0; 426 resetstate(); 427 } 428 } else { 429 outfile = stdout; 430 outfname = "stdout"; 431 } 432 if ((infile = fopen(fname, "r")) == NULL) { 433 warn("%s", fname); 434 rval = 1; 435 continue; 436 } 437 } 438 /* 439 * We are here only when infile is open and we still have something 440 * to read from it. 441 * 442 * Use getline() so that we can handle essentially infinite input 443 * data. The p and plen are static so each invocation gives 444 * getline() the same buffer which is expanded as needed. 445 */ 446 len = getline(&p, &plen, infile); 447 if (len == -1) 448 err(1, "%s", fname); 449 if (len != 0 && p[len - 1] == '\n') { 450 sp->append_newline = 1; 451 len--; 452 } else if (!lastline()) { 453 sp->append_newline = 1; 454 } else { 455 sp->append_newline = 0; 456 } 457 cspace(sp, p, len, spflag); 458 459 linenum++; 460 461 return (1); 462 } 463 464 /* 465 * Add a compilation unit to the linked list 466 */ 467 static void 468 add_compunit(enum e_cut type, char *s) 469 { 470 struct s_compunit *cu; 471 472 if ((cu = malloc(sizeof(struct s_compunit))) == NULL) 473 err(1, "malloc"); 474 cu->type = type; 475 cu->s = s; 476 cu->next = NULL; 477 *cu_nextp = cu; 478 cu_nextp = &cu->next; 479 } 480 481 /* 482 * Add a file to the linked list 483 */ 484 static void 485 add_file(char *s) 486 { 487 struct s_flist *fp; 488 489 if ((fp = malloc(sizeof(struct s_flist))) == NULL) 490 err(1, "malloc"); 491 fp->next = NULL; 492 *fl_nextp = fp; 493 fp->fname = s; 494 fl_nextp = &fp->next; 495 } 496 497 static int 498 next_files_have_lines(void) 499 { 500 struct s_flist *file; 501 FILE *file_fd; 502 int ch; 503 504 file = files; 505 while ((file = file->next) != NULL) { 506 if ((file_fd = fopen(file->fname, "r")) == NULL) 507 continue; 508 509 if ((ch = getc(file_fd)) != EOF) { 510 /* 511 * This next file has content, therefore current 512 * file doesn't contains the last line. 513 */ 514 ungetc(ch, file_fd); 515 fclose(file_fd); 516 return (1); 517 } 518 519 fclose(file_fd); 520 } 521 522 return (0); 523 } 524 525 int 526 lastline(void) 527 { 528 int ch; 529 530 if (feof(infile)) { 531 return !( 532 (inplace == NULL || ispan) && 533 next_files_have_lines()); 534 } 535 if ((ch = getc(infile)) == EOF) { 536 return !( 537 (inplace == NULL || ispan) && 538 next_files_have_lines()); 539 } 540 ungetc(ch, infile); 541 return (0); 542 } 543