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