main.c revision 1.34
1 /* $NetBSD: main.c,v 1.34 2015/03/12 12:40:41 christos Exp $ */ 2 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 #if HAVE_NBTOOL_CONFIG_H 38 #include "nbtool_config.h" 39 #endif 40 41 #include <sys/cdefs.h> 42 __RCSID("$NetBSD: main.c,v 1.34 2015/03/12 12:40:41 christos Exp $"); 43 #ifdef __FBSDID 44 __FBSDID("$FreeBSD: head/usr.bin/sed/main.c 252231 2013-06-26 04:14:19Z pfg $"); 45 #endif 46 47 #ifndef lint 48 __COPYRIGHT("@(#) Copyright (c) 1992, 1993\ 49 The Regents of the University of California. All rights reserved."); 50 #endif 51 52 #if 0 53 static const char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94"; 54 #endif 55 56 #include <sys/types.h> 57 #include <sys/mman.h> 58 #include <sys/param.h> 59 #include <sys/stat.h> 60 61 #include <err.h> 62 #include <errno.h> 63 #include <fcntl.h> 64 #include <libgen.h> 65 #include <limits.h> 66 #include <locale.h> 67 #include <regex.h> 68 #include <stddef.h> 69 #define _WITH_GETLINE 70 #include <stdio.h> 71 #include <stdlib.h> 72 #include <string.h> 73 #include <unistd.h> 74 75 #include "defs.h" 76 #include "extern.h" 77 78 /* 79 * Linked list of units (strings and files) to be compiled 80 */ 81 struct s_compunit { 82 struct s_compunit *next; 83 enum e_cut {CU_FILE, CU_STRING} type; 84 char *s; /* Pointer to string or fname */ 85 }; 86 87 /* 88 * Linked list pointer to compilation units and pointer to current 89 * next pointer. 90 */ 91 static struct s_compunit *script, **cu_nextp = &script; 92 93 /* 94 * Linked list of files to be processed 95 */ 96 struct s_flist { 97 char *fname; 98 struct s_flist *next; 99 }; 100 101 /* 102 * Linked list pointer to files and pointer to current 103 * next pointer. 104 */ 105 static struct s_flist *files, **fl_nextp = &files; 106 107 FILE *infile; /* Current input file */ 108 FILE *outfile; /* Current output file */ 109 110 int aflag, eflag, nflag; 111 int rflags = 0; 112 static int rval; /* Exit status */ 113 114 static int ispan; /* Whether inplace editing spans across files */ 115 116 /* 117 * Current file and line number; line numbers restart across compilation 118 * units, but span across input files. The latter is optional if editing 119 * in place. 120 */ 121 const char *fname; /* File name. */ 122 const char *outfname; /* Output file name */ 123 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */ 124 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */ 125 static const char *inplace; /* Inplace edit file extension. */ 126 u_long linenum; 127 128 static void add_compunit(enum e_cut, char *); 129 static void add_file(char *); 130 static void usage(void) __dead; 131 132 int 133 main(int argc, char *argv[]) 134 { 135 int c, fflag; 136 char *temp_arg; 137 138 setprogname(argv[0]); 139 (void) setlocale(LC_ALL, ""); 140 141 fflag = 0; 142 inplace = NULL; 143 144 while ((c = getopt(argc, argv, "EI::ae:f:i::lnru")) != -1) 145 switch (c) { 146 case 'r': /* Gnu sed compat */ 147 case 'E': 148 rflags = REG_EXTENDED; 149 break; 150 case 'I': 151 inplace = optarg ? optarg : __UNCONST(""); 152 ispan = 1; /* span across input files */ 153 break; 154 case 'a': 155 aflag = 1; 156 break; 157 case 'e': 158 eflag = 1; 159 temp_arg = xmalloc(strlen(optarg) + 2); 160 strcpy(temp_arg, optarg); 161 strcat(temp_arg, "\n"); 162 add_compunit(CU_STRING, temp_arg); 163 break; 164 case 'f': 165 fflag = 1; 166 add_compunit(CU_FILE, optarg); 167 break; 168 case 'i': 169 inplace = optarg ? optarg : __UNCONST(""); 170 ispan = 0; /* don't span across input files */ 171 break; 172 case 'l': 173 #ifdef _IOLBF 174 c = setvbuf(stdout, NULL, _IOLBF, 0); 175 #else 176 c = setlinebuf(stdout); 177 #endif 178 if (c) 179 warn("setting line buffered output failed"); 180 break; 181 case 'n': 182 nflag = 1; 183 break; 184 case 'u': 185 #ifdef _IONBF 186 c = setvbuf(stdout, NULL, _IONBF, 0); 187 #else 188 c = -1; 189 errno = EOPNOTSUPP; 190 #endif 191 if (c) 192 warn("setting unbuffered output failed"); 193 break; 194 default: 195 case '?': 196 usage(); 197 } 198 argc -= optind; 199 argv += optind; 200 201 /* First usage case; script is the first arg */ 202 if (!eflag && !fflag && *argv) { 203 add_compunit(CU_STRING, *argv); 204 argv++; 205 } 206 207 compile(); 208 209 /* Continue with first and start second usage */ 210 if (*argv) 211 for (; *argv; argv++) 212 add_file(*argv); 213 else 214 add_file(NULL); 215 process(); 216 cfclose(prog, NULL); 217 if (fclose(stdout)) 218 err(1, "stdout"); 219 exit(rval); 220 } 221 222 static void 223 usage(void) 224 { 225 (void)fprintf(stderr, 226 "Usage: %s [-aElnru] command [file ...]\n" 227 "\t%s [-aElnru] [-e command] [-f command_file] [-I[extension]]\n" 228 "\t [-i[extension]] [file ...]\n", getprogname(), getprogname()); 229 exit(1); 230 } 231 232 /* 233 * Like fgets, but go through the chain of compilation units chaining them 234 * together. Empty strings and files are ignored. 235 */ 236 char * 237 cu_fgets(char *buf, int n, int *more) 238 { 239 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 240 static FILE *f; /* Current open file */ 241 static char *s; /* Current pointer inside string */ 242 static char string_ident[30]; 243 char *p; 244 245 again: 246 switch (state) { 247 case ST_EOF: 248 if (script == NULL) { 249 if (more != NULL) 250 *more = 0; 251 return (NULL); 252 } 253 linenum = 0; 254 switch (script->type) { 255 case CU_FILE: 256 if ((f = fopen(script->s, "r")) == NULL) 257 err(1, "%s", script->s); 258 fname = script->s; 259 state = ST_FILE; 260 goto again; 261 case CU_STRING: 262 if (((size_t)snprintf(string_ident, 263 sizeof(string_ident), "\"%s\"", script->s)) >= 264 sizeof(string_ident) - 1) 265 (void)strcpy(string_ident + 266 sizeof(string_ident) - 6, " ...\""); 267 fname = string_ident; 268 s = script->s; 269 state = ST_STRING; 270 goto again; 271 } 272 case ST_FILE: 273 if ((p = fgets(buf, n, f)) != NULL) { 274 linenum++; 275 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 276 nflag = 1; 277 if (more != NULL) 278 *more = !feof(f); 279 return (p); 280 } 281 script = script->next; 282 (void)fclose(f); 283 state = ST_EOF; 284 goto again; 285 case ST_STRING: 286 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 287 nflag = 1; 288 p = buf; 289 for (;;) { 290 if (n-- <= 1) { 291 *p = '\0'; 292 linenum++; 293 if (more != NULL) 294 *more = 1; 295 return (buf); 296 } 297 switch (*s) { 298 case '\0': 299 state = ST_EOF; 300 if (s == script->s) { 301 script = script->next; 302 goto again; 303 } else { 304 script = script->next; 305 *p = '\0'; 306 linenum++; 307 if (more != NULL) 308 *more = 0; 309 return (buf); 310 } 311 case '\n': 312 *p++ = '\n'; 313 *p = '\0'; 314 s++; 315 linenum++; 316 if (more != NULL) 317 *more = 0; 318 return (buf); 319 default: 320 *p++ = *s++; 321 } 322 } 323 } 324 /* NOTREACHED */ 325 return (NULL); 326 } 327 328 /* 329 * Like fgets, but go through the list of files chaining them together. 330 * Set len to the length of the line. 331 */ 332 int 333 mf_fgets(SPACE *sp, enum e_spflag spflag) 334 { 335 struct stat sb; 336 size_t len; 337 static char *p = NULL; 338 static size_t plen = 0; 339 int c; 340 static int firstfile; 341 342 if (infile == NULL) { 343 /* stdin? */ 344 if (files->fname == NULL) { 345 if (inplace != NULL) 346 errx(1, "-I or -i may not be used with stdin"); 347 infile = stdin; 348 fname = "stdin"; 349 outfile = stdout; 350 outfname = "stdout"; 351 } 352 firstfile = 1; 353 } 354 355 for (;;) { 356 if (infile != NULL && (c = getc(infile)) != EOF) { 357 (void)ungetc(c, infile); 358 break; 359 } 360 /* If we are here then either eof or no files are open yet */ 361 if (infile == stdin) { 362 sp->len = 0; 363 return (0); 364 } 365 if (infile != NULL) { 366 fclose(infile); 367 if (*oldfname != '\0') { 368 /* if there was a backup file, remove it */ 369 unlink(oldfname); 370 /* 371 * Backup the original. Note that hard links 372 * are not supported on all filesystems. 373 */ 374 if ((link(fname, oldfname) != 0) && 375 (rename(fname, oldfname) != 0)) { 376 warn("rename()"); 377 if (*tmpfname) 378 unlink(tmpfname); 379 exit(1); 380 } 381 *oldfname = '\0'; 382 } 383 if (*tmpfname != '\0') { 384 if (outfile != NULL && outfile != stdout) 385 if (fclose(outfile) != 0) { 386 warn("fclose()"); 387 unlink(tmpfname); 388 exit(1); 389 } 390 outfile = NULL; 391 if (rename(tmpfname, fname) != 0) { 392 /* this should not happen really! */ 393 warn("rename()"); 394 unlink(tmpfname); 395 exit(1); 396 } 397 *tmpfname = '\0'; 398 } 399 outfname = NULL; 400 } 401 if (firstfile == 0) 402 files = files->next; 403 else 404 firstfile = 0; 405 if (files == NULL) { 406 sp->len = 0; 407 return (0); 408 } 409 fname = files->fname; 410 if (inplace != NULL) { 411 if (lstat(fname, &sb) != 0) 412 err(1, "%s", fname); 413 if (!(sb.st_mode & S_IFREG)) 414 errx(1, "%s: %s %s", fname, 415 "in-place editing only", 416 "works for regular files"); 417 if (*inplace != '\0') { 418 strlcpy(oldfname, fname, 419 sizeof(oldfname)); 420 len = strlcat(oldfname, inplace, 421 sizeof(oldfname)); 422 if (len > sizeof(oldfname)) 423 errx(1, "%s: name too long", fname); 424 } 425 char d_name[PATH_MAX], f_name[PATH_MAX]; 426 (void)strlcpy(d_name, fname, sizeof(d_name)); 427 (void)strlcpy(f_name, fname, sizeof(f_name)); 428 len = (size_t)snprintf(tmpfname, sizeof(tmpfname), 429 "%s/.!%ld!%s", dirname(d_name), (long)getpid(), 430 basename(f_name)); 431 if (len >= sizeof(tmpfname)) 432 errx(1, "%s: name too long", fname); 433 unlink(tmpfname); 434 if (outfile != NULL && outfile != stdout) 435 fclose(outfile); 436 if ((outfile = fopen(tmpfname, "w")) == NULL) 437 err(1, "%s", fname); 438 fchown(fileno(outfile), sb.st_uid, sb.st_gid); 439 fchmod(fileno(outfile), sb.st_mode & ALLPERMS); 440 outfname = tmpfname; 441 if (!ispan) { 442 linenum = 0; 443 resetstate(); 444 } 445 } else { 446 outfile = stdout; 447 outfname = "stdout"; 448 } 449 if ((infile = fopen(fname, "r")) == NULL) { 450 warn("%s", fname); 451 rval = 1; 452 continue; 453 } 454 } 455 /* 456 * We are here only when infile is open and we still have something 457 * to read from it. 458 * 459 * Use getline() so that we can handle essentially infinite input 460 * data. The p and plen are static so each invocation gives 461 * getline() the same buffer which is expanded as needed. 462 */ 463 ssize_t slen = getline(&p, &plen, infile); 464 if (slen == -1) 465 err(1, "%s", fname); 466 if (slen != 0 && p[slen - 1] == '\n') 467 slen--; 468 cspace(sp, p, (size_t)slen, spflag); 469 470 linenum++; 471 472 return (1); 473 } 474 475 /* 476 * Add a compilation unit to the linked list 477 */ 478 static void 479 add_compunit(enum e_cut type, char *s) 480 { 481 struct s_compunit *cu; 482 483 cu = xmalloc(sizeof(struct s_compunit)); 484 cu->type = type; 485 cu->s = s; 486 cu->next = NULL; 487 *cu_nextp = cu; 488 cu_nextp = &cu->next; 489 } 490 491 /* 492 * Add a file to the linked list 493 */ 494 static void 495 add_file(char *s) 496 { 497 struct s_flist *fp; 498 499 fp = xmalloc(sizeof(struct s_flist)); 500 fp->next = NULL; 501 *fl_nextp = fp; 502 fp->fname = s; 503 fl_nextp = &fp->next; 504 } 505 506 int 507 lastline(void) 508 { 509 int ch; 510 511 if (files->next != NULL && (inplace == NULL || ispan)) 512 return (0); 513 if ((ch = getc(infile)) == EOF) 514 return (1); 515 ungetc(ch, infile); 516 return (0); 517 } 518
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