1 /* $OpenBSD: main.c,v 1.15 2008/10/16 16:34:32 millert 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 1.15 2008/10/16 16:34:32 millert 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 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, "ae:f:nu")) != -1) 109 switch (c) { 110 case 'a': 111 aflag = 1; 112 break; 113 case 'e': 114 eflag = 1; 115 add_compunit(CU_STRING, optarg); 116 break; 117 case 'f': 118 fflag = 1; 119 add_compunit(CU_FILE, optarg); 120 break; 121 case 'n': 122 nflag = 1; 123 break; 124 case 'u': 125 setlinebuf(stdout); 126 break; 127 default: 128 case '?': 129 (void)fprintf(stderr, 130 "usage: sed [-anu] command [file ...]\n" 131 " sed [-anu] [-e command] [-f command_file] [file ...]\n"); 132 exit(1); 133 } 134 argc -= optind; 135 argv += optind; 136 137 /* First usage case; script is the first arg */ 138 if (!eflag && !fflag && *argv) { 139 add_compunit(CU_STRING, *argv); 140 argv++; 141 } 142 143 compile(); 144 145 /* Continue with first and start second usage */ 146 if (*argv) 147 for (; *argv; argv++) 148 add_file(*argv); 149 else 150 add_file(NULL); 151 process(); 152 cfclose(prog, NULL); 153 if (fclose(stdout)) 154 err(FATAL, "stdout: %s", strerror(errno)); 155 exit (0); 156 } 157 158 /* 159 * Like fgets, but go through the chain of compilation units chaining them 160 * together. Empty strings and files are ignored. 161 */ 162 char * 163 cu_fgets(char **outbuf, size_t *outsize) 164 { 165 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 166 static FILE *f; /* Current open file */ 167 static char *s; /* Current pointer inside string */ 168 static char string_ident[30]; 169 size_t len; 170 char *p; 171 172 if (*outbuf == NULL) 173 *outsize = 0; 174 175 again: 176 switch (state) { 177 case ST_EOF: 178 if (script == NULL) 179 return (NULL); 180 linenum = 0; 181 switch (script->type) { 182 case CU_FILE: 183 if ((f = fopen(script->s, "r")) == NULL) 184 err(FATAL, 185 "%s: %s", script->s, strerror(errno)); 186 fname = script->s; 187 state = ST_FILE; 188 goto again; 189 case CU_STRING: 190 if ((snprintf(string_ident, 191 sizeof(string_ident), "\"%s\"", script->s)) >= 192 sizeof(string_ident)) 193 strlcpy(string_ident + 194 sizeof(string_ident) - 6, " ...\"", 5); 195 fname = string_ident; 196 s = script->s; 197 state = ST_STRING; 198 goto again; 199 } 200 case ST_FILE: 201 if ((p = fgetln(f, &len)) != NULL) { 202 linenum++; 203 if (len >= *outsize) { 204 free(*outbuf); 205 *outsize = ROUNDLEN(len + 1); 206 *outbuf = xmalloc(*outsize); 207 } 208 memcpy(*outbuf, p, len); 209 (*outbuf)[len] = '\0'; 210 if (linenum == 1 && p[0] == '#' && p[1] == 'n') 211 nflag = 1; 212 return (*outbuf); 213 } 214 script = script->next; 215 (void)fclose(f); 216 state = ST_EOF; 217 goto again; 218 case ST_STRING: 219 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 220 nflag = 1; 221 p = *outbuf; 222 len = *outsize; 223 for (;;) { 224 if (len <= 1) { 225 *outbuf = xrealloc(*outbuf, 226 *outsize + _POSIX2_LINE_MAX); 227 p = *outbuf + *outsize - len; 228 len += _POSIX2_LINE_MAX; 229 *outsize += _POSIX2_LINE_MAX; 230 } 231 switch (*s) { 232 case '\0': 233 state = ST_EOF; 234 if (s == script->s) { 235 script = script->next; 236 goto again; 237 } else { 238 script = script->next; 239 *p = '\0'; 240 linenum++; 241 return (*outbuf); 242 } 243 case '\n': 244 *p++ = '\n'; 245 *p = '\0'; 246 s++; 247 linenum++; 248 return (*outbuf); 249 default: 250 *p++ = *s++; 251 len--; 252 } 253 } 254 } 255 /* NOTREACHED */ 256 } 257 258 /* 259 * Like fgets, but go through the list of files chaining them together. 260 * Set len to the length of the line. 261 */ 262 int 263 mf_fgets(SPACE *sp, enum e_spflag spflag) 264 { 265 static FILE *f; /* Current open file */ 266 size_t len; 267 char *p; 268 int c; 269 270 if (f == NULL) 271 /* Advance to first non-empty file */ 272 for (;;) { 273 if (files == NULL) { 274 lastline = 1; 275 return (0); 276 } 277 if (files->fname == NULL) { 278 f = stdin; 279 fname = "stdin"; 280 } else { 281 fname = files->fname; 282 if ((f = fopen(fname, "r")) == NULL) 283 err(FATAL, "%s: %s", 284 fname, strerror(errno)); 285 } 286 if ((c = getc(f)) != EOF) { 287 (void)ungetc(c, f); 288 break; 289 } 290 (void)fclose(f); 291 files = files->next; 292 } 293 294 if (lastline) { 295 sp->len = 0; 296 return (0); 297 } 298 299 /* 300 * Use fgetln so that we can handle essentially infinite input data. 301 * Can't use the pointer into the stdio buffer as the process space 302 * because the ungetc() can cause it to move. 303 */ 304 p = fgetln(f, &len); 305 if (ferror(f)) 306 err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO)); 307 cspace(sp, p, len, spflag); 308 309 linenum++; 310 /* Advance to next non-empty file */ 311 while ((c = getc(f)) == EOF) { 312 (void)fclose(f); 313 files = files->next; 314 if (files == NULL) { 315 lastline = 1; 316 return (1); 317 } 318 if (files->fname == NULL) { 319 f = stdin; 320 fname = "stdin"; 321 } else { 322 fname = files->fname; 323 if ((f = fopen(fname, "r")) == NULL) 324 err(FATAL, "%s: %s", fname, strerror(errno)); 325 } 326 } 327 (void)ungetc(c, f); 328 return (1); 329 } 330 331 /* 332 * Add a compilation unit to the linked list 333 */ 334 static void 335 add_compunit(enum e_cut type, char *s) 336 { 337 struct s_compunit *cu; 338 339 cu = xmalloc(sizeof(struct s_compunit)); 340 cu->type = type; 341 cu->s = s; 342 cu->next = NULL; 343 *cu_nextp = cu; 344 cu_nextp = &cu->next; 345 } 346 347 /* 348 * Add a file to the linked list 349 */ 350 static void 351 add_file(char *s) 352 { 353 struct s_flist *fp; 354 355 fp = xmalloc(sizeof(struct s_flist)); 356 fp->next = NULL; 357 *fl_nextp = fp; 358 fp->fname = s; 359 fl_nextp = &fp->next; 360 } 361