1 /* $OpenBSD: main.c,v 1.17 2009/10/27 23:59:43 deraadt 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 #include <sys/types.h> 37 38 #include <ctype.h> 39 #include <errno.h> 40 #include <fcntl.h> 41 #include <limits.h> 42 #include <regex.h> 43 #include <stddef.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #include "defs.h" 50 #include "extern.h" 51 52 /* 53 * Linked list of units (strings and files) to be compiled 54 */ 55 struct s_compunit { 56 struct s_compunit *next; 57 enum e_cut {CU_FILE, CU_STRING} type; 58 char *s; /* Pointer to string or fname */ 59 }; 60 61 /* 62 * Linked list pointer to compilation units and pointer to current 63 * next pointer. 64 */ 65 static struct s_compunit *script, **cu_nextp = &script; 66 67 /* 68 * Linked list of files to be processed 69 */ 70 struct s_flist { 71 char *fname; 72 struct s_flist *next; 73 }; 74 75 /* 76 * Linked list pointer to files and pointer to current 77 * next pointer. 78 */ 79 static struct s_flist *files, **fl_nextp = &files; 80 81 int Eflag, aflag, eflag, nflag; 82 83 /* 84 * Current file and line number; line numbers restart across compilation 85 * units, but span across input files. 86 */ 87 char *fname; /* File name. */ 88 u_long linenum; 89 int lastline; /* TRUE on the last line of the last file */ 90 91 static void add_compunit(enum e_cut, char *); 92 static void add_file(char *); 93 94 int 95 main(int argc, char *argv[]) 96 { 97 int c, fflag; 98 99 fflag = 0; 100 while ((c = getopt(argc, argv, "Eae:f:nru")) != -1) 101 switch (c) { 102 case 'E': 103 case 'r': 104 Eflag = 1; 105 break; 106 case 'a': 107 aflag = 1; 108 break; 109 case 'e': 110 eflag = 1; 111 add_compunit(CU_STRING, optarg); 112 break; 113 case 'f': 114 fflag = 1; 115 add_compunit(CU_FILE, optarg); 116 break; 117 case 'n': 118 nflag = 1; 119 break; 120 case 'u': 121 setlinebuf(stdout); 122 break; 123 default: 124 case '?': 125 (void)fprintf(stderr, 126 "usage: sed [-aEnru] command [file ...]\n" 127 " sed [-aEnru] [-e command] [-f command_file] [file ...]\n"); 128 exit(1); 129 } 130 argc -= optind; 131 argv += optind; 132 133 /* First usage case; script is the first arg */ 134 if (!eflag && !fflag && *argv) { 135 add_compunit(CU_STRING, *argv); 136 argv++; 137 } 138 139 compile(); 140 141 /* Continue with first and start second usage */ 142 if (*argv) 143 for (; *argv; argv++) 144 add_file(*argv); 145 else 146 add_file(NULL); 147 process(); 148 cfclose(prog, NULL); 149 if (fclose(stdout)) 150 err(FATAL, "stdout: %s", strerror(errno)); 151 exit (0); 152 } 153 154 /* 155 * Like fgets, but go through the chain of compilation units chaining them 156 * together. Empty strings and files are ignored. 157 */ 158 char * 159 cu_fgets(char **outbuf, size_t *outsize) 160 { 161 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 162 static FILE *f; /* Current open file */ 163 static char *s; /* Current pointer inside string */ 164 static char string_ident[30]; 165 size_t len; 166 char *p; 167 168 if (*outbuf == NULL) 169 *outsize = 0; 170 171 again: 172 switch (state) { 173 case ST_EOF: 174 if (script == NULL) 175 return (NULL); 176 linenum = 0; 177 switch (script->type) { 178 case CU_FILE: 179 if ((f = fopen(script->s, "r")) == NULL) 180 err(FATAL, 181 "%s: %s", script->s, strerror(errno)); 182 fname = script->s; 183 state = ST_FILE; 184 goto again; 185 case CU_STRING: 186 if ((snprintf(string_ident, 187 sizeof(string_ident), "\"%s\"", script->s)) >= 188 sizeof(string_ident)) 189 strlcpy(string_ident + 190 sizeof(string_ident) - 6, " ...\"", 5); 191 fname = string_ident; 192 s = script->s; 193 state = ST_STRING; 194 goto again; 195 } 196 case ST_FILE: 197 if ((p = fgetln(f, &len)) != NULL) { 198 linenum++; 199 if (len >= *outsize) { 200 free(*outbuf); 201 *outsize = ROUNDLEN(len + 1); 202 *outbuf = xmalloc(*outsize); 203 } 204 memcpy(*outbuf, p, len); 205 (*outbuf)[len] = '\0'; 206 if (linenum == 1 && p[0] == '#' && p[1] == 'n') 207 nflag = 1; 208 return (*outbuf); 209 } 210 script = script->next; 211 (void)fclose(f); 212 state = ST_EOF; 213 goto again; 214 case ST_STRING: 215 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 216 nflag = 1; 217 p = *outbuf; 218 len = *outsize; 219 for (;;) { 220 if (len <= 1) { 221 *outbuf = xrealloc(*outbuf, 222 *outsize + _POSIX2_LINE_MAX); 223 p = *outbuf + *outsize - len; 224 len += _POSIX2_LINE_MAX; 225 *outsize += _POSIX2_LINE_MAX; 226 } 227 switch (*s) { 228 case '\0': 229 state = ST_EOF; 230 if (s == script->s) { 231 script = script->next; 232 goto again; 233 } else { 234 script = script->next; 235 *p = '\0'; 236 linenum++; 237 return (*outbuf); 238 } 239 case '\n': 240 *p++ = '\n'; 241 *p = '\0'; 242 s++; 243 linenum++; 244 return (*outbuf); 245 default: 246 *p++ = *s++; 247 len--; 248 } 249 } 250 } 251 /* NOTREACHED */ 252 } 253 254 /* 255 * Like fgets, but go through the list of files chaining them together. 256 * Set len to the length of the line. 257 */ 258 int 259 mf_fgets(SPACE *sp, enum e_spflag spflag) 260 { 261 static FILE *f; /* Current open file */ 262 size_t len; 263 char *p; 264 int c; 265 266 if (f == NULL) 267 /* Advance to first non-empty file */ 268 for (;;) { 269 if (files == NULL) { 270 lastline = 1; 271 return (0); 272 } 273 if (files->fname == NULL) { 274 f = stdin; 275 fname = "stdin"; 276 } else { 277 fname = files->fname; 278 if ((f = fopen(fname, "r")) == NULL) 279 err(FATAL, "%s: %s", 280 fname, strerror(errno)); 281 } 282 if ((c = getc(f)) != EOF) { 283 (void)ungetc(c, f); 284 break; 285 } 286 (void)fclose(f); 287 files = files->next; 288 } 289 290 if (lastline) { 291 sp->len = 0; 292 return (0); 293 } 294 295 /* 296 * Use fgetln so that we can handle essentially infinite input data. 297 * Can't use the pointer into the stdio buffer as the process space 298 * because the ungetc() can cause it to move. 299 */ 300 p = fgetln(f, &len); 301 if (ferror(f)) 302 err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO)); 303 cspace(sp, p, len, spflag); 304 305 linenum++; 306 /* Advance to next non-empty file */ 307 while ((c = getc(f)) == EOF) { 308 (void)fclose(f); 309 files = files->next; 310 if (files == NULL) { 311 lastline = 1; 312 return (1); 313 } 314 if (files->fname == NULL) { 315 f = stdin; 316 fname = "stdin"; 317 } else { 318 fname = files->fname; 319 if ((f = fopen(fname, "r")) == NULL) 320 err(FATAL, "%s: %s", fname, strerror(errno)); 321 } 322 } 323 (void)ungetc(c, f); 324 return (1); 325 } 326 327 /* 328 * Add a compilation unit to the linked list 329 */ 330 static void 331 add_compunit(enum e_cut type, char *s) 332 { 333 struct s_compunit *cu; 334 335 cu = xmalloc(sizeof(struct s_compunit)); 336 cu->type = type; 337 cu->s = s; 338 cu->next = NULL; 339 *cu_nextp = cu; 340 cu_nextp = &cu->next; 341 } 342 343 /* 344 * Add a file to the linked list 345 */ 346 static void 347 add_file(char *s) 348 { 349 struct s_flist *fp; 350 351 fp = xmalloc(sizeof(struct s_flist)); 352 fp->next = NULL; 353 *fl_nextp = fp; 354 fp->fname = s; 355 fl_nextp = &fp->next; 356 } 357