1 /*- 2 * Copyright (c) 1992 Diomidis Spinellis. 3 * Copyright (c) 1992, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Diomidis Spinellis of Imperial College, University of London. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #ifndef lint 38 static const char copyright[] = 39 "@(#) Copyright (c) 1992, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif 42 43 #ifndef lint 44 static const char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94"; 45 #endif 46 47 #include <sys/types.h> 48 #include <sys/mman.h> 49 #include <sys/param.h> 50 #include <sys/stat.h> 51 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <libgen.h> 56 #include <limits.h> 57 #include <locale.h> 58 #include <regex.h> 59 #include <stddef.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <unistd.h> 64 65 #include "defs.h" 66 #include "extern.h" 67 68 /* 69 * Linked list of units (strings and files) to be compiled 70 */ 71 struct s_compunit { 72 struct s_compunit *next; 73 enum e_cut {CU_FILE, CU_STRING} type; 74 char *s; /* Pointer to string or fname */ 75 }; 76 77 /* 78 * Linked list pointer to compilation units and pointer to current 79 * next pointer. 80 */ 81 static struct s_compunit *script, **cu_nextp = &script; 82 83 /* 84 * Linked list of files to be processed 85 */ 86 struct s_flist { 87 char *fname; 88 struct s_flist *next; 89 }; 90 91 /* 92 * Linked list pointer to files and pointer to current 93 * next pointer. 94 */ 95 static struct s_flist *files, **fl_nextp = &files; 96 97 FILE *infile; /* Current input file */ 98 FILE *outfile; /* Current output file */ 99 100 int aflag, eflag, nflag; 101 int rflags = 0; 102 static int rval; /* Exit status */ 103 104 /* 105 * Current file and line number; line numbers restart across compilation 106 * units, but span across input files. 107 */ 108 const char *fname; /* File name. */ 109 const char *outfname; /* Output file name */ 110 static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */ 111 static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */ 112 const char *inplace; /* Inplace edit file extension. */ 113 u_long linenum; 114 115 static void add_compunit(enum e_cut, char *); 116 static void add_file(char *); 117 static int inplace_edit(char **); 118 static void usage(void); 119 120 int 121 main(int argc, char *argv[]) 122 { 123 int c, fflag; 124 char *temp_arg; 125 126 (void) setlocale(LC_ALL, ""); 127 128 fflag = 0; 129 inplace = NULL; 130 131 while ((c = getopt(argc, argv, "Eae:f:i:n")) != -1) 132 switch (c) { 133 case 'E': 134 rflags = REG_EXTENDED; 135 break; 136 case 'a': 137 aflag = 1; 138 break; 139 case 'e': 140 eflag = 1; 141 if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL) 142 err(1, "malloc"); 143 strcpy(temp_arg, optarg); 144 strcat(temp_arg, "\n"); 145 add_compunit(CU_STRING, temp_arg); 146 break; 147 case 'f': 148 fflag = 1; 149 add_compunit(CU_FILE, optarg); 150 break; 151 case 'i': 152 inplace = optarg; 153 break; 154 case 'n': 155 nflag = 1; 156 break; 157 default: 158 case '?': 159 usage(); 160 } 161 argc -= optind; 162 argv += optind; 163 164 /* First usage case; script is the first arg */ 165 if (!eflag && !fflag && *argv) { 166 add_compunit(CU_STRING, *argv); 167 argv++; 168 } 169 170 compile(); 171 172 /* Continue with first and start second usage */ 173 if (*argv) 174 for (; *argv; argv++) 175 add_file(*argv); 176 else 177 add_file(NULL); 178 process(); 179 cfclose(prog, NULL); 180 if (fclose(stdout)) 181 err(1, "stdout"); 182 exit(rval); 183 } 184 185 static void 186 usage(void) 187 { 188 (void)fprintf(stderr, "%s\n%s\n", 189 "usage: sed script [-Ean] [-i extension] [file ...]", 190 " sed [-an] [-i extension] [-e script] ... [-f script_file] ... [file ...]"); 191 exit(1); 192 } 193 194 /* 195 * Like fgets, but go through the chain of compilation units chaining them 196 * together. Empty strings and files are ignored. 197 */ 198 char * 199 cu_fgets(char *buf, int n, int *more) 200 { 201 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 202 static FILE *f; /* Current open file */ 203 static char *s; /* Current pointer inside string */ 204 static char string_ident[30]; 205 char *p; 206 207 again: 208 switch (state) { 209 case ST_EOF: 210 if (script == NULL) { 211 if (more != NULL) 212 *more = 0; 213 return (NULL); 214 } 215 linenum = 0; 216 switch (script->type) { 217 case CU_FILE: 218 if ((f = fopen(script->s, "r")) == NULL) 219 err(1, "%s", script->s); 220 fname = script->s; 221 state = ST_FILE; 222 goto again; 223 case CU_STRING: 224 if ((snprintf(string_ident, 225 sizeof(string_ident), "\"%s\"", script->s)) >= 226 sizeof(string_ident) - 1) 227 (void)strcpy(string_ident + 228 sizeof(string_ident) - 6, " ...\""); 229 fname = string_ident; 230 s = script->s; 231 state = ST_STRING; 232 goto again; 233 } 234 case ST_FILE: 235 if ((p = fgets(buf, n, f)) != NULL) { 236 linenum++; 237 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 238 nflag = 1; 239 if (more != NULL) 240 *more = !feof(f); 241 return (p); 242 } 243 script = script->next; 244 (void)fclose(f); 245 state = ST_EOF; 246 goto again; 247 case ST_STRING: 248 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 249 nflag = 1; 250 p = buf; 251 for (;;) { 252 if (n-- <= 1) { 253 *p = '\0'; 254 linenum++; 255 if (more != NULL) 256 *more = 1; 257 return (buf); 258 } 259 switch (*s) { 260 case '\0': 261 state = ST_EOF; 262 if (s == script->s) { 263 script = script->next; 264 goto again; 265 } else { 266 script = script->next; 267 *p = '\0'; 268 linenum++; 269 if (more != NULL) 270 *more = 0; 271 return (buf); 272 } 273 case '\n': 274 *p++ = '\n'; 275 *p = '\0'; 276 s++; 277 linenum++; 278 if (more != NULL) 279 *more = 0; 280 return (buf); 281 default: 282 *p++ = *s++; 283 } 284 } 285 } 286 /* NOTREACHED */ 287 return (NULL); 288 } 289 290 /* 291 * Like fgets, but go through the list of files chaining them together. 292 * Set len to the length of the line. 293 */ 294 int 295 mf_fgets(SPACE *sp, enum e_spflag spflag) 296 { 297 struct stat sb; 298 size_t len; 299 char *p; 300 int c; 301 static int firstfile; 302 303 if (infile == NULL) { 304 /* stdin? */ 305 if (files->fname == NULL) { 306 if (inplace != NULL) 307 errx(1, "-i may not be used with stdin"); 308 infile = stdin; 309 fname = "stdin"; 310 outfile = stdout; 311 outfname = "stdout"; 312 } 313 firstfile = 1; 314 } 315 316 for (;;) { 317 if (infile != NULL && (c = getc(infile)) != EOF) { 318 (void)ungetc(c, infile); 319 break; 320 } 321 /* If we are here then either eof or no files are open yet */ 322 if (infile == stdin) { 323 sp->len = 0; 324 return (0); 325 } 326 if (infile != NULL) { 327 fclose(infile); 328 if (*oldfname != '\0') { 329 if (rename(fname, oldfname) != 0) { 330 warn("rename()"); 331 unlink(tmpfname); 332 exit(1); 333 } 334 *oldfname = '\0'; 335 } 336 if (*tmpfname != '\0') { 337 if (outfile != NULL && outfile != stdout) 338 fclose(outfile); 339 outfile = NULL; 340 rename(tmpfname, fname); 341 *tmpfname = '\0'; 342 } 343 outfname = NULL; 344 } 345 if (firstfile == 0) 346 files = files->next; 347 else 348 firstfile = 0; 349 if (files == NULL) { 350 sp->len = 0; 351 return (0); 352 } 353 fname = files->fname; 354 if (inplace != NULL) { 355 if (lstat(fname, &sb) != 0) 356 err(1, "%s", fname); 357 if (!(sb.st_mode & S_IFREG)) 358 errx(1, "%s: %s %s", fname, 359 "in-place editing only", 360 "works for regular files"); 361 if (*inplace != '\0') { 362 strlcpy(oldfname, fname, 363 sizeof(oldfname)); 364 len = strlcat(oldfname, inplace, 365 sizeof(oldfname)); 366 if (len > sizeof(oldfname)) 367 errx(1, "%s: name too long", fname); 368 } 369 len = snprintf(tmpfname, sizeof(tmpfname), 370 "%s/.!%ld!%s", dirname(fname), (long)getpid(), 371 basename(fname)); 372 if (len >= sizeof(tmpfname)) 373 errx(1, "%s: name too long", fname); 374 unlink(tmpfname); 375 if ((outfile = fopen(tmpfname, "w")) == NULL) 376 err(1, "%s", fname); 377 fchown(fileno(outfile), sb.st_uid, sb.st_gid); 378 fchmod(fileno(outfile), sb.st_mode & ALLPERMS); 379 outfname = tmpfname; 380 } else { 381 outfile = stdout; 382 outfname = "stdout"; 383 } 384 if ((infile = fopen(fname, "r")) == NULL) { 385 warn("%s", fname); 386 rval = 1; 387 continue; 388 } 389 } 390 /* 391 * We are here only when infile is open and we still have something 392 * to read from it. 393 * 394 * Use fgetln so that we can handle essentially infinite input data. 395 * Can't use the pointer into the stdio buffer as the process space 396 * because the ungetc() can cause it to move. 397 */ 398 p = fgetln(infile, &len); 399 if (ferror(infile)) 400 errx(1, "%s: %s", fname, strerror(errno ? errno : EIO)); 401 if (len != 0 && p[len - 1] == '\n') 402 len--; 403 cspace(sp, p, len, spflag); 404 405 linenum++; 406 407 return (1); 408 } 409 410 /* 411 * Add a compilation unit to the linked list 412 */ 413 static void 414 add_compunit(enum e_cut type, char *s) 415 { 416 struct s_compunit *cu; 417 418 if ((cu = malloc(sizeof(struct s_compunit))) == NULL) 419 err(1, "malloc"); 420 cu->type = type; 421 cu->s = s; 422 cu->next = NULL; 423 *cu_nextp = cu; 424 cu_nextp = &cu->next; 425 } 426 427 /* 428 * Add a file to the linked list 429 */ 430 static void 431 add_file(char *s) 432 { 433 struct s_flist *fp; 434 435 if ((fp = malloc(sizeof(struct s_flist))) == NULL) 436 err(1, "malloc"); 437 fp->next = NULL; 438 *fl_nextp = fp; 439 fp->fname = s; 440 fl_nextp = &fp->next; 441 } 442 443 int 444 lastline(void) 445 { 446 int ch; 447 448 if (files->next != NULL) 449 return (0); 450 if ((ch = getc(infile)) == EOF) 451 return (1); 452 ungetc(ch, infile); 453 return (0); 454 } 455