1 /* $OpenBSD: main.c,v 1.12 2007/10/16 20:19:27 sobrado 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 1.12 2007/10/16 20:19:27 sobrado 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 <regex.h> 50 #include <stddef.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #include "defs.h" 57 #include "extern.h" 58 59 /* 60 * Linked list of units (strings and files) to be compiled 61 */ 62 struct s_compunit { 63 struct s_compunit *next; 64 enum e_cut {CU_FILE, CU_STRING} type; 65 char *s; /* Pointer to string or fname */ 66 }; 67 68 /* 69 * Linked list pointer to compilation units and pointer to current 70 * next pointer. 71 */ 72 static struct s_compunit *script, **cu_nextp = &script; 73 74 /* 75 * Linked list of files to be processed 76 */ 77 struct s_flist { 78 char *fname; 79 struct s_flist *next; 80 }; 81 82 /* 83 * Linked list pointer to files and pointer to current 84 * next pointer. 85 */ 86 static struct s_flist *files, **fl_nextp = &files; 87 88 int aflag, eflag, nflag; 89 90 /* 91 * Current file and line number; line numbers restart across compilation 92 * units, but span across input files. 93 */ 94 char *fname; /* File name. */ 95 u_long linenum; 96 int lastline; /* TRUE on the last line of the last file */ 97 98 static void add_compunit(enum e_cut, char *); 99 static void add_file(char *); 100 101 int 102 main(int argc, char *argv[]) 103 { 104 int c, fflag; 105 106 fflag = 0; 107 while ((c = getopt(argc, argv, "ae:f:nu")) != -1) 108 switch (c) { 109 case 'a': 110 aflag = 1; 111 break; 112 case 'e': 113 eflag = 1; 114 add_compunit(CU_STRING, optarg); 115 break; 116 case 'f': 117 fflag = 1; 118 add_compunit(CU_FILE, optarg); 119 break; 120 case 'n': 121 nflag = 1; 122 break; 123 case 'u': 124 setlinebuf(stdout); 125 break; 126 default: 127 case '?': 128 (void)fprintf(stderr, 129 "usage: sed [-anu] command [file ...]\n" 130 " sed [-anu] [-e command] [-f command_file] [file ...]\n"); 131 exit(1); 132 } 133 argc -= optind; 134 argv += optind; 135 136 /* First usage case; script is the first arg */ 137 if (!eflag && !fflag && *argv) { 138 add_compunit(CU_STRING, *argv); 139 argv++; 140 } 141 142 compile(); 143 144 /* Continue with first and start second usage */ 145 if (*argv) 146 for (; *argv; argv++) 147 add_file(*argv); 148 else 149 add_file(NULL); 150 process(); 151 cfclose(prog, NULL); 152 if (fclose(stdout)) 153 err(FATAL, "stdout: %s", strerror(errno)); 154 exit (0); 155 } 156 157 /* 158 * Like fgets, but go through the chain of compilation units chaining them 159 * together. Empty strings and files are ignored. 160 */ 161 char * 162 cu_fgets(char *buf, int n) 163 { 164 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 165 static FILE *f; /* Current open file */ 166 static char *s; /* Current pointer inside string */ 167 static char string_ident[30]; 168 char *p; 169 170 again: 171 switch (state) { 172 case ST_EOF: 173 if (script == NULL) 174 return (NULL); 175 linenum = 0; 176 switch (script->type) { 177 case CU_FILE: 178 if ((f = fopen(script->s, "r")) == NULL) 179 err(FATAL, 180 "%s: %s", script->s, strerror(errno)); 181 fname = script->s; 182 state = ST_FILE; 183 goto again; 184 case CU_STRING: 185 if ((snprintf(string_ident, 186 sizeof(string_ident), "\"%s\"", script->s)) >= 187 sizeof(string_ident)) 188 strlcpy(string_ident + 189 sizeof(string_ident) - 6, " ...\"", 5); 190 fname = string_ident; 191 s = script->s; 192 state = ST_STRING; 193 goto again; 194 } 195 case ST_FILE: 196 if ((p = fgets(buf, n, f)) != NULL) { 197 linenum++; 198 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 199 nflag = 1; 200 return (p); 201 } 202 script = script->next; 203 (void)fclose(f); 204 state = ST_EOF; 205 goto again; 206 case ST_STRING: 207 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 208 nflag = 1; 209 p = buf; 210 for (;;) { 211 if (n-- <= 1) { 212 *p = '\0'; 213 linenum++; 214 return (buf); 215 } 216 switch (*s) { 217 case '\0': 218 state = ST_EOF; 219 if (s == script->s) { 220 script = script->next; 221 goto again; 222 } else { 223 script = script->next; 224 *p = '\0'; 225 linenum++; 226 return (buf); 227 } 228 case '\n': 229 *p++ = '\n'; 230 *p = '\0'; 231 s++; 232 linenum++; 233 return (buf); 234 default: 235 *p++ = *s++; 236 } 237 } 238 } 239 /* NOTREACHED */ 240 } 241 242 /* 243 * Like fgets, but go through the list of files chaining them together. 244 * Set len to the length of the line. 245 */ 246 int 247 mf_fgets(SPACE *sp, enum e_spflag spflag) 248 { 249 static FILE *f; /* Current open file */ 250 size_t len; 251 char *p; 252 int c; 253 254 if (f == NULL) 255 /* Advance to first non-empty file */ 256 for (;;) { 257 if (files == NULL) { 258 lastline = 1; 259 return (0); 260 } 261 if (files->fname == NULL) { 262 f = stdin; 263 fname = "stdin"; 264 } else { 265 fname = files->fname; 266 if ((f = fopen(fname, "r")) == NULL) 267 err(FATAL, "%s: %s", 268 fname, strerror(errno)); 269 } 270 if ((c = getc(f)) != EOF) { 271 (void)ungetc(c, f); 272 break; 273 } 274 (void)fclose(f); 275 files = files->next; 276 } 277 278 if (lastline) { 279 sp->len = 0; 280 return (0); 281 } 282 283 /* 284 * Use fgetln so that we can handle essentially infinite input data. 285 * Can't use the pointer into the stdio buffer as the process space 286 * because the ungetc() can cause it to move. 287 */ 288 p = fgetln(f, &len); 289 if (ferror(f)) 290 err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO)); 291 cspace(sp, p, len, spflag); 292 293 linenum++; 294 /* Advance to next non-empty file */ 295 while ((c = getc(f)) == EOF) { 296 (void)fclose(f); 297 files = files->next; 298 if (files == NULL) { 299 lastline = 1; 300 return (1); 301 } 302 if (files->fname == NULL) { 303 f = stdin; 304 fname = "stdin"; 305 } else { 306 fname = files->fname; 307 if ((f = fopen(fname, "r")) == NULL) 308 err(FATAL, "%s: %s", fname, strerror(errno)); 309 } 310 } 311 (void)ungetc(c, f); 312 return (1); 313 } 314 315 /* 316 * Add a compilation unit to the linked list 317 */ 318 static void 319 add_compunit(enum e_cut type, char *s) 320 { 321 struct s_compunit *cu; 322 323 cu = xmalloc(sizeof(struct s_compunit)); 324 cu->type = type; 325 cu->s = s; 326 cu->next = NULL; 327 *cu_nextp = cu; 328 cu_nextp = &cu->next; 329 } 330 331 /* 332 * Add a file to the linked list 333 */ 334 static void 335 add_file(char *s) 336 { 337 struct s_flist *fp; 338 339 fp = xmalloc(sizeof(struct s_flist)); 340 fp->next = NULL; 341 *fl_nextp = fp; 342 fp->fname = s; 343 fl_nextp = &fp->next; 344 } 345