main.c revision 1.27
1 /* $NetBSD: main.c,v 1.27 2014/06/18 14:15:50 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 1.27 2014/06/18 14:15:50 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 #include <sys/types.h> 53 #include <sys/mman.h> 54 #include <sys/param.h> 55 #include <sys/stat.h> 56 57 #include <err.h> 58 #include <errno.h> 59 #include <fcntl.h> 60 #include <libgen.h> 61 #include <limits.h> 62 #include <locale.h> 63 #include <regex.h> 64 #include <stddef.h> 65 #define _WITH_GETLINE 66 #include <stdio.h> 67 #include <stdlib.h> 68 #include <string.h> 69 #include <unistd.h> 70 71 #include "defs.h" 72 #include "extern.h" 73 74 /* 75 * Linked list of units (strings and files) to be compiled 76 */ 77 struct s_compunit { 78 struct s_compunit *next; 79 enum e_cut {CU_FILE, CU_STRING} type; 80 char *s; /* Pointer to string or fname */ 81 }; 82 83 /* 84 * Linked list pointer to compilation units and pointer to current 85 * next pointer. 86 */ 87 static struct s_compunit *script, **cu_nextp = &script; 88 89 /* 90 * Linked list of files to be processed 91 */ 92 struct s_flist { 93 char *fname; 94 struct s_flist *next; 95 }; 96 97 /* 98 * Linked list pointer to files and pointer to current 99 * next pointer. 100 */ 101 static struct s_flist *files, **fl_nextp = &files; 102 103 FILE *infile; /* Current input file */ 104 FILE *outfile; /* Current output file */ 105 106 int aflag, eflag, nflag; 107 int rflags = 0; 108 static int rval; /* Exit status */ 109 110 static int ispan; /* Whether inplace editing spans across files */ 111 112 /* 113 * Current file and line number; line numbers restart across compilation 114 * units, but span across input files. The latter is optional if editing 115 * in place. 116 */ 117 const char *fname; /* File name. */ 118 const char *outfname; /* Output file name */ 119 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */ 120 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */ 121 static const char *inplace; /* Inplace edit file extension. */ 122 u_long linenum; 123 124 static void add_compunit(enum e_cut, char *); 125 static void add_file(char *); 126 static void usage(void) __dead; 127 128 int 129 main(int argc, char *argv[]) 130 { 131 int c, fflag; 132 char *temp_arg; 133 134 setprogname(argv[0]); 135 (void) setlocale(LC_ALL, ""); 136 137 fflag = 0; 138 inplace = NULL; 139 140 while ((c = getopt(argc, argv, "EI::ae:f:i::lnru")) != -1) 141 switch (c) { 142 case 'r': /* Gnu sed compat */ 143 case 'E': 144 rflags = REG_EXTENDED; 145 break; 146 case 'I': 147 inplace = optarg ? optarg : __UNCONST(""); 148 ispan = 1; /* span across input files */ 149 break; 150 case 'a': 151 aflag = 1; 152 break; 153 case 'e': 154 eflag = 1; 155 temp_arg = xmalloc(strlen(optarg) + 2); 156 strcpy(temp_arg, optarg); 157 strcat(temp_arg, "\n"); 158 add_compunit(CU_STRING, temp_arg); 159 break; 160 case 'f': 161 fflag = 1; 162 add_compunit(CU_FILE, optarg); 163 break; 164 case 'i': 165 inplace = optarg ? optarg : __UNCONST(""); 166 ispan = 0; /* don't span across input files */ 167 break; 168 case 'l': 169 #ifdef _IOLBF 170 c = setvbuf(stdout, NULL, _IOLBF, 0); 171 #else 172 c = setlinebuf(stdout); 173 #endif 174 if (c) 175 warn("setting line buffered output failed"); 176 break; 177 case 'n': 178 nflag = 1; 179 break; 180 case 'u': 181 #ifdef _IONBF 182 c = setvbuf(stdout, NULL, _IONBF, 0); 183 #else 184 c = -1; 185 errno = EOPNOTSUPP; 186 #endif 187 if (c) 188 warn("setting unbuffered output failed"); 189 break; 190 default: 191 case '?': 192 usage(); 193 } 194 argc -= optind; 195 argv += optind; 196 197 /* First usage case; script is the first arg */ 198 if (!eflag && !fflag && *argv) { 199 add_compunit(CU_STRING, *argv); 200 argv++; 201 } 202 203 compile(); 204 205 /* Continue with first and start second usage */ 206 if (*argv) 207 for (; *argv; argv++) 208 add_file(*argv); 209 else 210 add_file(NULL); 211 process(); 212 cfclose(prog, NULL); 213 if (fclose(stdout)) 214 err(1, "stdout"); 215 exit(rval); 216 } 217 218 static void 219 usage(void) 220 { 221 (void)fprintf(stderr, 222 "Usage: %s [-aElnru] command [file ...]\n" 223 "\t%s [-aElnru] [-e command] [-f command_file] [-I[extension]]\n" 224 "\t [-i[extension]] [file ...]\n", getprogname(), getprogname()); 225 exit(1); 226 } 227 228 /* 229 * Like fgets, but go through the chain of compilation units chaining them 230 * together. Empty strings and files are ignored. 231 */ 232 char * 233 cu_fgets(char *buf, int n, int *more) 234 { 235 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 236 static FILE *f; /* Current open file */ 237 static char *s; /* Current pointer inside string */ 238 static char string_ident[30]; 239 char *p; 240 241 again: 242 switch (state) { 243 case ST_EOF: 244 if (script == NULL) { 245 if (more != NULL) 246 *more = 0; 247 return (NULL); 248 } 249 linenum = 0; 250 switch (script->type) { 251 case CU_FILE: 252 if ((f = fopen(script->s, "r")) == NULL) 253 err(1, "%s", script->s); 254 fname = script->s; 255 state = ST_FILE; 256 goto again; 257 case CU_STRING: 258 if (((size_t)snprintf(string_ident, 259 sizeof(string_ident), "\"%s\"", script->s)) >= 260 sizeof(string_ident) - 1) 261 (void)strcpy(string_ident + 262 sizeof(string_ident) - 6, " ...\""); 263 fname = string_ident; 264 s = script->s; 265 state = ST_STRING; 266 goto again; 267 } 268 case ST_FILE: 269 if ((p = fgets(buf, n, f)) != NULL) { 270 linenum++; 271 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 272 nflag = 1; 273 if (more != NULL) 274 *more = !feof(f); 275 return (p); 276 } 277 script = script->next; 278 (void)fclose(f); 279 state = ST_EOF; 280 goto again; 281 case ST_STRING: 282 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 283 nflag = 1; 284 p = buf; 285 for (;;) { 286 if (n-- <= 1) { 287 *p = '\0'; 288 linenum++; 289 if (more != NULL) 290 *more = 1; 291 return (buf); 292 } 293 switch (*s) { 294 case '\0': 295 state = ST_EOF; 296 if (s == script->s) { 297 script = script->next; 298 goto again; 299 } else { 300 script = script->next; 301 *p = '\0'; 302 linenum++; 303 if (more != NULL) 304 *more = 0; 305 return (buf); 306 } 307 case '\n': 308 *p++ = '\n'; 309 *p = '\0'; 310 s++; 311 linenum++; 312 if (more != NULL) 313 *more = 0; 314 return (buf); 315 default: 316 *p++ = *s++; 317 } 318 } 319 } 320 /* NOTREACHED */ 321 return (NULL); 322 } 323 324 /* 325 * Like fgets, but go through the list of files chaining them together. 326 * Set len to the length of the line. 327 */ 328 int 329 mf_fgets(SPACE *sp, enum e_spflag spflag) 330 { 331 struct stat sb; 332 size_t len; 333 static char *p = NULL; 334 static size_t plen = 0; 335 int c; 336 static int firstfile; 337 338 if (infile == NULL) { 339 /* stdin? */ 340 if (files->fname == NULL) { 341 if (inplace != NULL) 342 errx(1, "-I or -i may not be used with stdin"); 343 infile = stdin; 344 fname = "stdin"; 345 outfile = stdout; 346 outfname = "stdout"; 347 } 348 firstfile = 1; 349 } 350 351 for (;;) { 352 if (infile != NULL && (c = getc(infile)) != EOF) { 353 (void)ungetc(c, infile); 354 break; 355 } 356 /* If we are here then either eof or no files are open yet */ 357 if (infile == stdin) { 358 sp->len = 0; 359 return (0); 360 } 361 if (infile != NULL) { 362 fclose(infile); 363 if (*oldfname != '\0') { 364 /* if there was a backup file, remove it */ 365 unlink(oldfname); 366 /* 367 * Backup the original. Note that hard links 368 * are not supported on all filesystems. 369 */ 370 if ((link(fname, oldfname) != 0) && 371 (rename(fname, oldfname) != 0)) { 372 warn("rename()"); 373 if (*tmpfname) 374 unlink(tmpfname); 375 exit(1); 376 } 377 *oldfname = '\0'; 378 } 379 if (*tmpfname != '\0') { 380 if (outfile != NULL && outfile != stdout) 381 if (fclose(outfile) != 0) { 382 warn("fclose()"); 383 unlink(tmpfname); 384 exit(1); 385 } 386 outfile = NULL; 387 if (rename(tmpfname, fname) != 0) { 388 /* this should not happen really! */ 389 warn("rename()"); 390 unlink(tmpfname); 391 exit(1); 392 } 393 *tmpfname = '\0'; 394 } 395 outfname = NULL; 396 } 397 if (firstfile == 0) 398 files = files->next; 399 else 400 firstfile = 0; 401 if (files == NULL) { 402 sp->len = 0; 403 return (0); 404 } 405 fname = files->fname; 406 if (inplace != NULL) { 407 if (lstat(fname, &sb) != 0) 408 err(1, "%s", fname); 409 if (!(sb.st_mode & S_IFREG)) 410 errx(1, "%s: %s %s", fname, 411 "in-place editing only", 412 "works for regular files"); 413 if (*inplace != '\0') { 414 strlcpy(oldfname, fname, 415 sizeof(oldfname)); 416 len = strlcat(oldfname, inplace, 417 sizeof(oldfname)); 418 if (len > sizeof(oldfname)) 419 errx(1, "%s: name too long", fname); 420 } 421 char d_name[PATH_MAX], f_name[PATH_MAX]; 422 (void)strlcpy(d_name, fname, sizeof(d_name)); 423 (void)strlcpy(f_name, fname, sizeof(f_name)); 424 len = (size_t)snprintf(tmpfname, sizeof(tmpfname), 425 "%s/.!%ld!%s", dirname(d_name), (long)getpid(), 426 basename(f_name)); 427 if (len >= sizeof(tmpfname)) 428 errx(1, "%s: name too long", fname); 429 unlink(tmpfname); 430 if ((outfile = fopen(tmpfname, "w")) == NULL) 431 err(1, "%s", fname); 432 fchown(fileno(outfile), sb.st_uid, sb.st_gid); 433 fchmod(fileno(outfile), sb.st_mode & ALLPERMS); 434 outfname = tmpfname; 435 if (!ispan) { 436 linenum = 0; 437 resetstate(); 438 } 439 } else { 440 outfile = stdout; 441 outfname = "stdout"; 442 } 443 if ((infile = fopen(fname, "r")) == NULL) { 444 warn("%s", fname); 445 rval = 1; 446 continue; 447 } 448 } 449 /* 450 * We are here only when infile is open and we still have something 451 * to read from it. 452 * 453 * Use getline() so that we can handle essentially infinite input 454 * data. The p and plen are static so each invocation gives 455 * getline() the same buffer which is expanded as needed. 456 */ 457 ssize_t slen = getline(&p, &plen, infile); 458 if (slen == -1) 459 err(1, "%s", fname); 460 if (slen != 0 && p[slen - 1] == '\n') 461 slen--; 462 cspace(sp, p, (size_t)slen, 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 cu = xmalloc(sizeof(struct s_compunit)); 478 cu->type = type; 479 cu->s = s; 480 cu->next = NULL; 481 *cu_nextp = cu; 482 cu_nextp = &cu->next; 483 } 484 485 /* 486 * Add a file to the linked list 487 */ 488 static void 489 add_file(char *s) 490 { 491 struct s_flist *fp; 492 493 fp = xmalloc(sizeof(struct s_flist)); 494 fp->next = NULL; 495 *fl_nextp = fp; 496 fp->fname = s; 497 fl_nextp = &fp->next; 498 } 499 500 int 501 lastline(void) 502 { 503 int ch; 504 505 if (files->next != NULL && (inplace == NULL || ispan)) 506 return (0); 507 if ((ch = getc(infile)) == EOF) 508 return (1); 509 ungetc(ch, infile); 510 return (0); 511 } 512
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