1 /* $OpenBSD: main.c,v 1.16 2009/08/07 03:30:56 djm Exp $ */ 2 3 /*- 4 * Copyright (c) 1992 Diomidis Spinellis. 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Diomidis Spinellis of Imperial College, University of London. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static const char copyright[] = 38 "@(#) Copyright (c) 1992, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 /* from: static char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94"; */ 41 static const char rcsid[] = "$OpenBSD: main.c,v 1.16 2009/08/07 03:30:56 djm Exp $"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 46 #include <ctype.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <limits.h> 50 #include <regex.h> 51 #include <stddef.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 #include "defs.h" 58 #include "extern.h" 59 60 /* 61 * Linked list of units (strings and files) to be compiled 62 */ 63 struct s_compunit { 64 struct s_compunit *next; 65 enum e_cut {CU_FILE, CU_STRING} type; 66 char *s; /* Pointer to string or fname */ 67 }; 68 69 /* 70 * Linked list pointer to compilation units and pointer to current 71 * next pointer. 72 */ 73 static struct s_compunit *script, **cu_nextp = &script; 74 75 /* 76 * Linked list of files to be processed 77 */ 78 struct s_flist { 79 char *fname; 80 struct s_flist *next; 81 }; 82 83 /* 84 * Linked list pointer to files and pointer to current 85 * next pointer. 86 */ 87 static struct s_flist *files, **fl_nextp = &files; 88 89 int Eflag, aflag, eflag, nflag; 90 91 /* 92 * Current file and line number; line numbers restart across compilation 93 * units, but span across input files. 94 */ 95 char *fname; /* File name. */ 96 u_long linenum; 97 int lastline; /* TRUE on the last line of the last file */ 98 99 static void add_compunit(enum e_cut, char *); 100 static void add_file(char *); 101 102 int 103 main(int argc, char *argv[]) 104 { 105 int c, fflag; 106 107 fflag = 0; 108 while ((c = getopt(argc, argv, "Eae:f:nru")) != -1) 109 switch (c) { 110 case 'E': 111 case 'r': 112 Eflag = 1; 113 break; 114 case 'a': 115 aflag = 1; 116 break; 117 case 'e': 118 eflag = 1; 119 add_compunit(CU_STRING, optarg); 120 break; 121 case 'f': 122 fflag = 1; 123 add_compunit(CU_FILE, optarg); 124 break; 125 case 'n': 126 nflag = 1; 127 break; 128 case 'u': 129 setlinebuf(stdout); 130 break; 131 default: 132 case '?': 133 (void)fprintf(stderr, 134 "usage: sed [-aEnru] command [file ...]\n" 135 " sed [-aEnru] [-e command] [-f command_file] [file ...]\n"); 136 exit(1); 137 } 138 argc -= optind; 139 argv += optind; 140 141 /* First usage case; script is the first arg */ 142 if (!eflag && !fflag && *argv) { 143 add_compunit(CU_STRING, *argv); 144 argv++; 145 } 146 147 compile(); 148 149 /* Continue with first and start second usage */ 150 if (*argv) 151 for (; *argv; argv++) 152 add_file(*argv); 153 else 154 add_file(NULL); 155 process(); 156 cfclose(prog, NULL); 157 if (fclose(stdout)) 158 err(FATAL, "stdout: %s", strerror(errno)); 159 exit (0); 160 } 161 162 /* 163 * Like fgets, but go through the chain of compilation units chaining them 164 * together. Empty strings and files are ignored. 165 */ 166 char * 167 cu_fgets(char **outbuf, size_t *outsize) 168 { 169 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 170 static FILE *f; /* Current open file */ 171 static char *s; /* Current pointer inside string */ 172 static char string_ident[30]; 173 size_t len; 174 char *p; 175 176 if (*outbuf == NULL) 177 *outsize = 0; 178 179 again: 180 switch (state) { 181 case ST_EOF: 182 if (script == NULL) 183 return (NULL); 184 linenum = 0; 185 switch (script->type) { 186 case CU_FILE: 187 if ((f = fopen(script->s, "r")) == NULL) 188 err(FATAL, 189 "%s: %s", script->s, strerror(errno)); 190 fname = script->s; 191 state = ST_FILE; 192 goto again; 193 case CU_STRING: 194 if ((snprintf(string_ident, 195 sizeof(string_ident), "\"%s\"", script->s)) >= 196 sizeof(string_ident)) 197 strlcpy(string_ident + 198 sizeof(string_ident) - 6, " ...\"", 5); 199 fname = string_ident; 200 s = script->s; 201 state = ST_STRING; 202 goto again; 203 } 204 case ST_FILE: 205 if ((p = fgetln(f, &len)) != NULL) { 206 linenum++; 207 if (len >= *outsize) { 208 free(*outbuf); 209 *outsize = ROUNDLEN(len + 1); 210 *outbuf = xmalloc(*outsize); 211 } 212 memcpy(*outbuf, p, len); 213 (*outbuf)[len] = '\0'; 214 if (linenum == 1 && p[0] == '#' && p[1] == 'n') 215 nflag = 1; 216 return (*outbuf); 217 } 218 script = script->next; 219 (void)fclose(f); 220 state = ST_EOF; 221 goto again; 222 case ST_STRING: 223 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 224 nflag = 1; 225 p = *outbuf; 226 len = *outsize; 227 for (;;) { 228 if (len <= 1) { 229 *outbuf = xrealloc(*outbuf, 230 *outsize + _POSIX2_LINE_MAX); 231 p = *outbuf + *outsize - len; 232 len += _POSIX2_LINE_MAX; 233 *outsize += _POSIX2_LINE_MAX; 234 } 235 switch (*s) { 236 case '\0': 237 state = ST_EOF; 238 if (s == script->s) { 239 script = script->next; 240 goto again; 241 } else { 242 script = script->next; 243 *p = '\0'; 244 linenum++; 245 return (*outbuf); 246 } 247 case '\n': 248 *p++ = '\n'; 249 *p = '\0'; 250 s++; 251 linenum++; 252 return (*outbuf); 253 default: 254 *p++ = *s++; 255 len--; 256 } 257 } 258 } 259 /* NOTREACHED */ 260 } 261 262 /* 263 * Like fgets, but go through the list of files chaining them together. 264 * Set len to the length of the line. 265 */ 266 int 267 mf_fgets(SPACE *sp, enum e_spflag spflag) 268 { 269 static FILE *f; /* Current open file */ 270 size_t len; 271 char *p; 272 int c; 273 274 if (f == NULL) 275 /* Advance to first non-empty file */ 276 for (;;) { 277 if (files == NULL) { 278 lastline = 1; 279 return (0); 280 } 281 if (files->fname == NULL) { 282 f = stdin; 283 fname = "stdin"; 284 } else { 285 fname = files->fname; 286 if ((f = fopen(fname, "r")) == NULL) 287 err(FATAL, "%s: %s", 288 fname, strerror(errno)); 289 } 290 if ((c = getc(f)) != EOF) { 291 (void)ungetc(c, f); 292 break; 293 } 294 (void)fclose(f); 295 files = files->next; 296 } 297 298 if (lastline) { 299 sp->len = 0; 300 return (0); 301 } 302 303 /* 304 * Use fgetln so that we can handle essentially infinite input data. 305 * Can't use the pointer into the stdio buffer as the process space 306 * because the ungetc() can cause it to move. 307 */ 308 p = fgetln(f, &len); 309 if (ferror(f)) 310 err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO)); 311 cspace(sp, p, len, spflag); 312 313 linenum++; 314 /* Advance to next non-empty file */ 315 while ((c = getc(f)) == EOF) { 316 (void)fclose(f); 317 files = files->next; 318 if (files == NULL) { 319 lastline = 1; 320 return (1); 321 } 322 if (files->fname == NULL) { 323 f = stdin; 324 fname = "stdin"; 325 } else { 326 fname = files->fname; 327 if ((f = fopen(fname, "r")) == NULL) 328 err(FATAL, "%s: %s", fname, strerror(errno)); 329 } 330 } 331 (void)ungetc(c, f); 332 return (1); 333 } 334 335 /* 336 * Add a compilation unit to the linked list 337 */ 338 static void 339 add_compunit(enum e_cut type, char *s) 340 { 341 struct s_compunit *cu; 342 343 cu = xmalloc(sizeof(struct s_compunit)); 344 cu->type = type; 345 cu->s = s; 346 cu->next = NULL; 347 *cu_nextp = cu; 348 cu_nextp = &cu->next; 349 } 350 351 /* 352 * Add a file to the linked list 353 */ 354 static void 355 add_file(char *s) 356 { 357 struct s_flist *fp; 358 359 fp = xmalloc(sizeof(struct s_flist)); 360 fp->next = NULL; 361 *fl_nextp = fp; 362 fp->fname = s; 363 fl_nextp = &fp->next; 364 } 365