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