1 /* $OpenBSD: main.c,v 1.9 2003/06/10 22:20:50 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 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1992, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 /* from: static char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94"; */ 44 static char *rcsid = "$OpenBSD: main.c,v 1.9 2003/06/10 22:20:50 deraadt Exp $"; 45 #endif /* not lint */ 46 47 #include <sys/types.h> 48 49 #include <ctype.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <regex.h> 53 #include <stddef.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 #include "defs.h" 60 #include "extern.h" 61 62 /* 63 * Linked list of units (strings and files) to be compiled 64 */ 65 struct s_compunit { 66 struct s_compunit *next; 67 enum e_cut {CU_FILE, CU_STRING} type; 68 char *s; /* Pointer to string or fname */ 69 }; 70 71 /* 72 * Linked list pointer to compilation units and pointer to current 73 * next pointer. 74 */ 75 static struct s_compunit *script, **cu_nextp = &script; 76 77 /* 78 * Linked list of files to be processed 79 */ 80 struct s_flist { 81 char *fname; 82 struct s_flist *next; 83 }; 84 85 /* 86 * Linked list pointer to files and pointer to current 87 * next pointer. 88 */ 89 static struct s_flist *files, **fl_nextp = &files; 90 91 int aflag, eflag, nflag; 92 93 /* 94 * Current file and line number; line numbers restart across compilation 95 * units, but span across input files. 96 */ 97 char *fname; /* File name. */ 98 u_long linenum; 99 int lastline; /* TRUE on the last line of the last file */ 100 101 static void add_compunit(enum e_cut, char *); 102 static void add_file(char *); 103 104 int 105 main(int argc, char *argv[]) 106 { 107 int c, fflag; 108 109 fflag = 0; 110 while ((c = getopt(argc, argv, "ae:f:n")) != -1) 111 switch (c) { 112 case 'a': 113 aflag = 1; 114 break; 115 case 'e': 116 eflag = 1; 117 add_compunit(CU_STRING, optarg); 118 break; 119 case 'f': 120 fflag = 1; 121 add_compunit(CU_FILE, optarg); 122 break; 123 case 'n': 124 nflag = 1; 125 break; 126 default: 127 case '?': 128 (void)fprintf(stderr, 129 "usage:\tsed script [-an] [file ...]\n\tsed [-an] [-e script] ... [-f script_file] ... [file ...]\n"); 130 exit(1); 131 } 132 argc -= optind; 133 argv += optind; 134 135 /* First usage case; script is the first arg */ 136 if (!eflag && !fflag && *argv) { 137 add_compunit(CU_STRING, *argv); 138 argv++; 139 } 140 141 compile(); 142 143 /* Continue with first and start second usage */ 144 if (*argv) 145 for (; *argv; argv++) 146 add_file(*argv); 147 else 148 add_file(NULL); 149 process(); 150 cfclose(prog, NULL); 151 if (fclose(stdout)) 152 err(FATAL, "stdout: %s", strerror(errno)); 153 exit (0); 154 } 155 156 /* 157 * Like fgets, but go through the chain of compilation units chaining them 158 * together. Empty strings and files are ignored. 159 */ 160 char * 161 cu_fgets(char *buf, int n) 162 { 163 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 164 static FILE *f; /* Current open file */ 165 static char *s; /* Current pointer inside string */ 166 static char string_ident[30]; 167 char *p; 168 169 again: 170 switch (state) { 171 case ST_EOF: 172 if (script == NULL) 173 return (NULL); 174 linenum = 0; 175 switch (script->type) { 176 case CU_FILE: 177 if ((f = fopen(script->s, "r")) == NULL) 178 err(FATAL, 179 "%s: %s", script->s, strerror(errno)); 180 fname = script->s; 181 state = ST_FILE; 182 goto again; 183 case CU_STRING: 184 if ((snprintf(string_ident, 185 sizeof(string_ident), "\"%s\"", script->s)) >= 186 sizeof(string_ident)) 187 strlcpy(string_ident + 188 sizeof(string_ident) - 6, " ...\"", 5); 189 fname = string_ident; 190 s = script->s; 191 state = ST_STRING; 192 goto again; 193 } 194 case ST_FILE: 195 if ((p = fgets(buf, n, f)) != NULL) { 196 linenum++; 197 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 198 nflag = 1; 199 return (p); 200 } 201 script = script->next; 202 (void)fclose(f); 203 state = ST_EOF; 204 goto again; 205 case ST_STRING: 206 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 207 nflag = 1; 208 p = buf; 209 for (;;) { 210 if (n-- <= 1) { 211 *p = '\0'; 212 linenum++; 213 return (buf); 214 } 215 switch (*s) { 216 case '\0': 217 state = ST_EOF; 218 if (s == script->s) { 219 script = script->next; 220 goto again; 221 } else { 222 script = script->next; 223 *p = '\0'; 224 linenum++; 225 return (buf); 226 } 227 case '\n': 228 *p++ = '\n'; 229 *p = '\0'; 230 s++; 231 linenum++; 232 return (buf); 233 default: 234 *p++ = *s++; 235 } 236 } 237 } 238 /* NOTREACHED */ 239 } 240 241 /* 242 * Like fgets, but go through the list of files chaining them together. 243 * Set len to the length of the line. 244 */ 245 int 246 mf_fgets(SPACE *sp, enum e_spflag spflag) 247 { 248 static FILE *f; /* Current open file */ 249 size_t len; 250 char *p; 251 int c; 252 253 if (f == NULL) 254 /* Advance to first non-empty file */ 255 for (;;) { 256 if (files == NULL) { 257 lastline = 1; 258 return (0); 259 } 260 if (files->fname == NULL) { 261 f = stdin; 262 fname = "stdin"; 263 } else { 264 fname = files->fname; 265 if ((f = fopen(fname, "r")) == NULL) 266 err(FATAL, "%s: %s", 267 fname, strerror(errno)); 268 } 269 if ((c = getc(f)) != EOF) { 270 (void)ungetc(c, f); 271 break; 272 } 273 (void)fclose(f); 274 files = files->next; 275 } 276 277 if (lastline) { 278 sp->len = 0; 279 return (0); 280 } 281 282 /* 283 * Use fgetln so that we can handle essentially infinite input data. 284 * Can't use the pointer into the stdio buffer as the process space 285 * because the ungetc() can cause it to move. 286 */ 287 p = fgetln(f, &len); 288 if (ferror(f)) 289 err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO)); 290 cspace(sp, p, len, spflag); 291 292 linenum++; 293 /* Advance to next non-empty file */ 294 while ((c = getc(f)) == EOF) { 295 (void)fclose(f); 296 files = files->next; 297 if (files == NULL) { 298 lastline = 1; 299 return (1); 300 } 301 if (files->fname == NULL) { 302 f = stdin; 303 fname = "stdin"; 304 } else { 305 fname = files->fname; 306 if ((f = fopen(fname, "r")) == NULL) 307 err(FATAL, "%s: %s", fname, strerror(errno)); 308 } 309 } 310 (void)ungetc(c, f); 311 return (1); 312 } 313 314 /* 315 * Add a compilation unit to the linked list 316 */ 317 static void 318 add_compunit(enum e_cut type, char *s) 319 { 320 struct s_compunit *cu; 321 322 cu = xmalloc(sizeof(struct s_compunit)); 323 cu->type = type; 324 cu->s = s; 325 cu->next = NULL; 326 *cu_nextp = cu; 327 cu_nextp = &cu->next; 328 } 329 330 /* 331 * Add a file to the linked list 332 */ 333 static void 334 add_file(char *s) 335 { 336 struct s_flist *fp; 337 338 fp = xmalloc(sizeof(struct s_flist)); 339 fp->next = NULL; 340 *fl_nextp = fp; 341 fp->fname = s; 342 fl_nextp = &fp->next; 343 } 344