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
main(int argc,char * argv[])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 *
cu_fgets(char * buf,int n)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
mf_fgets(SPACE * sp,enum e_spflag spflag)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
add_compunit(enum e_cut type,char * s)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
add_file(char * s)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