main.c (8200B)
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 #include "util.h" 52 53 /* 54 * Linked list of units (strings and files) to be compiled 55 */ 56 struct s_compunit { 57 struct s_compunit *next; 58 enum e_cut {CU_FILE, CU_STRING} type; 59 char *s; /* Pointer to string or fname */ 60 }; 61 62 /* 63 * Linked list pointer to compilation units and pointer to current 64 * next pointer. 65 */ 66 static struct s_compunit *script, **cu_nextp = &script; 67 68 /* 69 * Linked list of files to be processed 70 */ 71 struct s_flist { 72 char *fname; 73 struct s_flist *next; 74 }; 75 76 /* 77 * Linked list pointer to files and pointer to current 78 * next pointer. 79 */ 80 static struct s_flist *files, **fl_nextp = &files; 81 82 int Eflag, aflag, eflag, nflag; 83 84 /* 85 * Current file and line number; line numbers restart across compilation 86 * units, but span across input files. 87 */ 88 char *fname; /* File name. */ 89 u_long linenum; 90 int lastline; /* TRUE on the last line of the last file */ 91 92 static void add_compunit(enum e_cut, char *); 93 static void add_file(char *); 94 95 int 96 main(int argc, char *argv[]) 97 { 98 int c, fflag; 99 100 fflag = 0; 101 while ((c = getopt(argc, argv, "Eae:f:nru")) != -1) 102 switch (c) { 103 case 'E': 104 case 'r': 105 Eflag = 1; 106 break; 107 case 'a': 108 aflag = 1; 109 break; 110 case 'e': 111 eflag = 1; 112 add_compunit(CU_STRING, optarg); 113 break; 114 case 'f': 115 fflag = 1; 116 add_compunit(CU_FILE, optarg); 117 break; 118 case 'n': 119 nflag = 1; 120 break; 121 case 'u': 122 setlinebuf(stdout); 123 break; 124 default: 125 case '?': 126 (void)fprintf(stderr, 127 "usage: sed [-aEnru] command [file ...]\n" 128 " sed [-aEnru] [-e command] [-f command_file] [file ...]\n"); 129 exit(1); 130 } 131 argc -= optind; 132 argv += optind; 133 134 /* First usage case; script is the first arg */ 135 if (!eflag && !fflag && *argv) { 136 add_compunit(CU_STRING, *argv); 137 argv++; 138 } 139 140 compile(); 141 142 /* Continue with first and start second usage */ 143 if (*argv) 144 for (; *argv; argv++) 145 add_file(*argv); 146 else 147 add_file(NULL); 148 process(); 149 cfclose(prog, NULL); 150 if (fclose(stdout)) 151 err(FATAL, "stdout: %s", strerror(errno)); 152 exit (0); 153 } 154 155 /* 156 * Like fgets, but go through the chain of compilation units chaining them 157 * together. Empty strings and files are ignored. 158 */ 159 char * 160 cu_fgets(char **outbuf, size_t *outsize) 161 { 162 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 163 static FILE *f; /* Current open file */ 164 static char *s; /* Current pointer inside string */ 165 static char string_ident[30]; 166 size_t len; 167 char *p; 168 169 if (*outbuf == NULL) 170 *outsize = 0; 171 172 again: 173 switch (state) { 174 case ST_EOF: 175 if (script == NULL) 176 return (NULL); 177 linenum = 0; 178 switch (script->type) { 179 case CU_FILE: 180 if ((f = fopen(script->s, "r")) == NULL) 181 err(FATAL, 182 "%s: %s", script->s, strerror(errno)); 183 fname = script->s; 184 state = ST_FILE; 185 goto again; 186 case CU_STRING: 187 if ((snprintf(string_ident, 188 sizeof(string_ident), "\"%s\"", script->s)) >= 189 sizeof(string_ident)) 190 strlcpy(string_ident + 191 sizeof(string_ident) - 6, " ...\"", 5); 192 fname = string_ident; 193 s = script->s; 194 state = ST_STRING; 195 goto again; 196 } 197 case ST_FILE: 198 if ((p = fgetln(f, &len)) != NULL) { 199 linenum++; 200 if (len >= *outsize) { 201 free(*outbuf); 202 *outsize = ROUNDLEN(len + 1); 203 *outbuf = xmalloc(*outsize); 204 } 205 memcpy(*outbuf, p, len); 206 (*outbuf)[len] = '\0'; 207 if (linenum == 1 && p[0] == '#' && p[1] == 'n') 208 nflag = 1; 209 return (*outbuf); 210 } 211 script = script->next; 212 (void)fclose(f); 213 state = ST_EOF; 214 goto again; 215 case ST_STRING: 216 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 217 nflag = 1; 218 p = *outbuf; 219 len = *outsize; 220 for (;;) { 221 if (len <= 1) { 222 *outbuf = xrealloc(*outbuf, 223 *outsize + _POSIX2_LINE_MAX); 224 p = *outbuf + *outsize - len; 225 len += _POSIX2_LINE_MAX; 226 *outsize += _POSIX2_LINE_MAX; 227 } 228 switch (*s) { 229 case '\0': 230 state = ST_EOF; 231 if (s == script->s) { 232 script = script->next; 233 goto again; 234 } else { 235 script = script->next; 236 *p = '\0'; 237 linenum++; 238 return (*outbuf); 239 } 240 case '\n': 241 *p++ = '\n'; 242 *p = '\0'; 243 s++; 244 linenum++; 245 return (*outbuf); 246 default: 247 *p++ = *s++; 248 len--; 249 } 250 } 251 } 252 /* NOTREACHED */ 253 return NULL; 254 } 255 256 /* 257 * Like fgets, but go through the list of files chaining them together. 258 * Set len to the length of the line. 259 */ 260 int 261 mf_fgets(SPACE *sp, enum e_spflag spflag) 262 { 263 static FILE *f; /* Current open file */ 264 size_t len; 265 char *p; 266 int c; 267 268 if (f == NULL) 269 /* Advance to first non-empty file */ 270 for (;;) { 271 if (files == NULL) { 272 lastline = 1; 273 return (0); 274 } 275 if (files->fname == NULL) { 276 f = stdin; 277 fname = "stdin"; 278 } else { 279 fname = files->fname; 280 if ((f = fopen(fname, "r")) == NULL) 281 err(FATAL, "%s: %s", 282 fname, strerror(errno)); 283 } 284 if ((c = getc(f)) != EOF) { 285 (void)ungetc(c, f); 286 break; 287 } 288 (void)fclose(f); 289 files = files->next; 290 } 291 292 if (lastline) { 293 sp->len = 0; 294 return (0); 295 } 296 297 /* 298 * Use fgetln so that we can handle essentially infinite input data. 299 * Can't use the pointer into the stdio buffer as the process space 300 * because the ungetc() can cause it to move. 301 */ 302 p = fgetln(f, &len); 303 if (ferror(f)) 304 err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO)); 305 cspace(sp, p, len, spflag); 306 307 linenum++; 308 /* Advance to next non-empty file */ 309 while ((c = getc(f)) == EOF) { 310 (void)fclose(f); 311 files = files->next; 312 if (files == NULL) { 313 lastline = 1; 314 return (1); 315 } 316 if (files->fname == NULL) { 317 f = stdin; 318 fname = "stdin"; 319 } else { 320 fname = files->fname; 321 if ((f = fopen(fname, "r")) == NULL) 322 err(FATAL, "%s: %s", fname, strerror(errno)); 323 } 324 } 325 (void)ungetc(c, f); 326 return (1); 327 } 328 329 /* 330 * Add a compilation unit to the linked list 331 */ 332 static void 333 add_compunit(enum e_cut type, char *s) 334 { 335 struct s_compunit *cu; 336 337 cu = xmalloc(sizeof(struct s_compunit)); 338 cu->type = type; 339 cu->s = s; 340 cu->next = NULL; 341 *cu_nextp = cu; 342 cu_nextp = &cu->next; 343 } 344 345 /* 346 * Add a file to the linked list 347 */ 348 static void 349 add_file(char *s) 350 { 351 struct s_flist *fp; 352 353 fp = xmalloc(sizeof(struct s_flist)); 354 fp->next = NULL; 355 *fl_nextp = fp; 356 fp->fname = s; 357 fl_nextp = &fp->next; 358 }