main.c revision 1.6
1 /*- 2 * Copyright (c) 1992 Diomidis Spinellis. 3 * Copyright (c) 1992, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Diomidis Spinellis of Imperial College, University of London. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #ifndef lint 39 static char copyright[] = 40 "@(#) Copyright (c) 1992, 1993\n\ 41 The Regents of the University of California. All rights reserved.\n"; 42 #endif /* not lint */ 43 44 #ifndef lint 45 /* from: static char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94"; */ 46 static char *rcsid = "$Id: main.c,v 1.6 1994/02/03 23:44:53 cgd Exp $"; 47 #endif /* not lint */ 48 49 #include <sys/types.h> 50 51 #include <ctype.h> 52 #include <errno.h> 53 #include <fcntl.h> 54 #include <regex.h> 55 #include <stddef.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #include "defs.h" 62 #include "extern.h" 63 64 /* 65 * Linked list of units (strings and files) to be compiled 66 */ 67 struct s_compunit { 68 struct s_compunit *next; 69 enum e_cut {CU_FILE, CU_STRING} type; 70 char *s; /* Pointer to string or fname */ 71 }; 72 73 /* 74 * Linked list pointer to compilation units and pointer to current 75 * next pointer. 76 */ 77 static struct s_compunit *script, **cu_nextp = &script; 78 79 /* 80 * Linked list of files to be processed 81 */ 82 struct s_flist { 83 char *fname; 84 struct s_flist *next; 85 }; 86 87 /* 88 * Linked list pointer to files and pointer to current 89 * next pointer. 90 */ 91 static struct s_flist *files, **fl_nextp = &files; 92 93 int aflag, eflag, nflag; 94 95 /* 96 * Current file and line number; line numbers restart across compilation 97 * units, but span across input files. 98 */ 99 char *fname; /* File name. */ 100 u_long linenum; 101 int lastline; /* TRUE on the last line of the last file */ 102 103 static void add_compunit __P((enum e_cut, char *)); 104 static void add_file __P((char *)); 105 106 int 107 main(argc, argv) 108 int argc; 109 char *argv[]; 110 { 111 int c, fflag; 112 113 fflag = 0; 114 while ((c = getopt(argc, argv, "ae:f:n")) != EOF) 115 switch (c) { 116 case 'a': 117 aflag = 1; 118 break; 119 case 'e': 120 eflag = 1; 121 add_compunit(CU_STRING, optarg); 122 break; 123 case 'f': 124 fflag = 1; 125 add_compunit(CU_FILE, optarg); 126 break; 127 case 'n': 128 nflag = 1; 129 break; 130 default: 131 case '?': 132 (void)fprintf(stderr, 133 "usage:\tsed script [-an] [file ...]\n\tsed [-an] [-e script] ... [-f scipt_file] ... [file ...]\n"); 134 exit(1); 135 } 136 argc -= optind; 137 argv += optind; 138 139 /* First usage case; script is the first arg */ 140 if (!eflag && !fflag && *argv) { 141 add_compunit(CU_STRING, *argv); 142 argv++; 143 } 144 145 compile(); 146 147 /* Continue with first and start second usage */ 148 if (*argv) 149 for (; *argv; argv++) 150 add_file(*argv); 151 else 152 add_file(NULL); 153 process(); 154 cfclose(prog, NULL); 155 if (fclose(stdout)) 156 err(FATAL, "stdout: %s", strerror(errno)); 157 exit (0); 158 } 159 160 /* 161 * Like fgets, but go through the chain of compilation units chaining them 162 * together. Empty strings and files are ignored. 163 */ 164 char * 165 cu_fgets(buf, n) 166 char *buf; 167 int n; 168 { 169 static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF; 170 static FILE *f; /* Current open file */ 171 static char *s; /* Current pointer inside string */ 172 static char string_ident[30]; 173 char *p; 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) - 1) 193 (void)strcpy(string_ident + 194 sizeof(string_ident) - 6, " ...\""); 195 fname = string_ident; 196 s = script->s; 197 state = ST_STRING; 198 goto again; 199 } 200 case ST_FILE: 201 if ((p = fgets(buf, n, f)) != NULL) { 202 linenum++; 203 if (linenum == 1 && buf[0] == '#' && buf[1] == 'n') 204 nflag = 1; 205 return (p); 206 } 207 script = script->next; 208 (void)fclose(f); 209 state = ST_EOF; 210 goto again; 211 case ST_STRING: 212 if (linenum == 0 && s[0] == '#' && s[1] == 'n') 213 nflag = 1; 214 p = buf; 215 for (;;) { 216 if (n-- <= 1) { 217 *p = '\0'; 218 linenum++; 219 return (buf); 220 } 221 switch (*s) { 222 case '\0': 223 state = ST_EOF; 224 if (s == script->s) { 225 script = script->next; 226 goto again; 227 } else { 228 script = script->next; 229 *p = '\0'; 230 linenum++; 231 return (buf); 232 } 233 case '\n': 234 *p++ = '\n'; 235 *p = '\0'; 236 s++; 237 linenum++; 238 return (buf); 239 default: 240 *p++ = *s++; 241 } 242 } 243 } 244 /* NOTREACHED */ 245 } 246 247 /* 248 * Like fgets, but go through the list of files chaining them together. 249 * Set len to the length of the line. 250 */ 251 int 252 mf_fgets(sp, spflag) 253 SPACE *sp; 254 enum e_spflag spflag; 255 { 256 static FILE *f; /* Current open file */ 257 size_t len; 258 char c, *p; 259 260 if (f == NULL) 261 /* Advance to first non-empty file */ 262 for (;;) { 263 if (files == NULL) { 264 lastline = 1; 265 return (0); 266 } 267 if (files->fname == NULL) { 268 f = stdin; 269 fname = "stdin"; 270 } else { 271 fname = files->fname; 272 if ((f = fopen(fname, "r")) == NULL) 273 err(FATAL, "%s: %s", 274 fname, strerror(errno)); 275 } 276 if ((c = getc(f)) != EOF) { 277 (void)ungetc(c, f); 278 break; 279 } 280 (void)fclose(f); 281 files = files->next; 282 } 283 284 if (lastline) { 285 sp->len = 0; 286 return (0); 287 } 288 289 /* 290 * Use fgetln so that we can handle essentially infinite input data. 291 * Can't use the pointer into the stdio buffer as the process space 292 * because the ungetc() can cause it to move. 293 */ 294 p = fgetln(f, &len); 295 if (ferror(f)) 296 err(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO)); 297 cspace(sp, p, len, spflag); 298 299 linenum++; 300 /* Advance to next non-empty file */ 301 while ((c = getc(f)) == EOF) { 302 (void)fclose(f); 303 files = files->next; 304 if (files == NULL) { 305 lastline = 1; 306 return (1); 307 } 308 if (files->fname == NULL) { 309 f = stdin; 310 fname = "stdin"; 311 } else { 312 fname = files->fname; 313 if ((f = fopen(fname, "r")) == NULL) 314 err(FATAL, "%s: %s", fname, strerror(errno)); 315 } 316 } 317 (void)ungetc(c, f); 318 return (1); 319 } 320 321 /* 322 * Add a compilation unit to the linked list 323 */ 324 static void 325 add_compunit(type, s) 326 enum e_cut type; 327 char *s; 328 { 329 struct s_compunit *cu; 330 331 cu = xmalloc(sizeof(struct s_compunit)); 332 cu->type = type; 333 cu->s = s; 334 cu->next = NULL; 335 *cu_nextp = cu; 336 cu_nextp = &cu->next; 337 } 338 339 /* 340 * Add a file to the linked list 341 */ 342 static void 343 add_file(s) 344 char *s; 345 { 346 struct s_flist *fp; 347 348 fp = xmalloc(sizeof(struct s_flist)); 349 fp->next = NULL; 350 *fl_nextp = fp; 351 fp->fname = s; 352 fl_nextp = &fp->next; 353 } 354
Indexes created Tue Sep 23 14:10:03 GMT 2025