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1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1987, 1993, 1994, 1995
5  *      The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31
32 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1987, 1993, 1994, 1995\n\
35         The Regents of the University of California.  All rights reserved.\n";
36 #endif
37
38 #if 0
39 #ifndef lint
40 static char sccsid[] = "@(#)ctags.c     8.4 (Berkeley) 2/7/95";
41 #endif
42 #endif
43
44 #include <sys/cdefs.h>
45 #include <sys/types.h>
46 #include <sys/wait.h>
47 __FBSDID("$FreeBSD$");
48
49 #include <err.h>
50 #include <limits.h>
51 #include <locale.h>
52 #include <regex.h>
53 #include <stdio.h>
54 #include <stdlib.h>
55 #include <string.h>
56 #include <unistd.h>
57
58 #include "ctags.h"
59
60 /*
61  * ctags: create a tags file
62  */
63
64 NODE    *head;                  /* head of the sorted binary tree */
65
66                                 /* boolean "func" (see init()) */
67 bool    _wht[256], _etk[256], _itk[256], _btk[256], _gd[256];
68
69 FILE    *inf;                   /* ioptr for current input file */
70 FILE    *outf;                  /* ioptr for tags file */
71
72 long    lineftell;              /* ftell after getc( inf ) == '\n' */
73
74 int     lineno;                 /* line number of current line */
75 int     dflag;                  /* -d: non-macro defines */
76 int     tflag;                  /* -t: create tags for typedefs */
77 int     vflag;                  /* -v: vgrind style index output */
78 int     wflag;                  /* -w: suppress warnings */
79 int     xflag;                  /* -x: cxref style output */
80
81 char    *curfile;               /* current input file name */
82 char    searchar = '/';         /* use /.../ searches by default */
83 char    lbuf[LINE_MAX];
84
85 void    init(void);
86 void    find_entries(char *);
87 static void usage(void);
88
89 int
90 main(int argc, char **argv)
91 {
92         static const char       *outfile = "tags";      /* output file */
93         int     aflag;                          /* -a: append to tags */
94         int     uflag;                          /* -u: update tags */
95         int     exit_val;                       /* exit value */
96         int     step;                           /* step through args */
97         int     ch;                             /* getopts char */
98
99         setlocale(LC_ALL, "");
100
101         aflag = uflag = NO;
102         tflag = YES;
103         while ((ch = getopt(argc, argv, "BFTadf:tuwvx")) != -1)
104                 switch(ch) {
105                 case 'B':
106                         searchar = '?';
107                         break;
108                 case 'F':
109                         searchar = '/';
110                         break;
111                 case 'T':
112                         tflag = NO;
113                         break;
114                 case 'a':
115                         aflag++;
116                         break;
117                 case 'd':
118                         dflag++;
119                         break;
120                 case 'f':
121                         outfile = optarg;
122                         break;
123                 case 't':
124                         tflag = YES;
125                         break;
126                 case 'u':
127                         uflag++;
128                         break;
129                 case 'w':
130                         wflag++;
131                         break;
132                 case 'v':
133                         vflag++;
134                 case 'x':
135                         xflag++;
136                         break;
137                 case '?':
138                 default:
139                         usage();
140                 }
141         argv += optind;
142         argc -= optind;
143         if (!argc)
144                 usage();
145
146         if (!xflag)
147                 setlocale(LC_COLLATE, "C");
148
149         init();
150
151         for (exit_val = step = 0; step < argc; ++step)
152                 if (!(inf = fopen(argv[step], "r"))) {
153                         warn("%s", argv[step]);
154                         exit_val = 1;
155                 }
156                 else {
157                         curfile = argv[step];
158                         find_entries(argv[step]);
159                         (void)fclose(inf);
160                 }
161
162         if (head) {
163                 if (xflag)
164                         put_entries(head);
165                 else {
166                         if (uflag) {
167                                 FILE *oldf;
168                                 regex_t *regx;
169
170                                 if ((oldf = fopen(outfile, "r")) == NULL)
171                                         err(1, "opening %s", outfile);
172                                 if (unlink(outfile))
173                                         err(1, "unlinking %s", outfile);
174                                 if ((outf = fopen(outfile, "w")) == NULL)
175                                         err(1, "recreating %s", outfile);
176                                 if ((regx = calloc(argc, sizeof(regex_t))) == NULL)
177                                         err(1, "RE alloc");
178                                 for (step = 0; step < argc; step++) {
179                                         (void)strcpy(lbuf, "\t");
180                                         (void)strlcat(lbuf, argv[step], LINE_MAX);
181                                         (void)strlcat(lbuf, "\t", LINE_MAX);
182                                         if (regcomp(regx + step, lbuf,
183                                             REG_NOSPEC))
184                                                 warn("RE compilation failed");
185                                 }
186 nextline:
187                                 while (fgets(lbuf, LINE_MAX, oldf)) {
188                                         for (step = 0; step < argc; step++)
189                                                 if (regexec(regx + step,
190                                                     lbuf, 0, NULL, 0) == 0)
191                                                         goto nextline;
192                                         fputs(lbuf, outf);
193                                 }
194                                 for (step = 0; step < argc; step++)
195                                         regfree(regx + step);
196                                 free(regx);
197                                 fclose(oldf);
198                                 fclose(outf);
199                                 ++aflag;
200                         }
201                         if (!(outf = fopen(outfile, aflag ? "a" : "w")))
202                                 err(1, "%s", outfile);
203                         put_entries(head);
204                         (void)fclose(outf);
205                         if (uflag) {
206                                 pid_t pid;
207
208                                 if ((pid = fork()) == -1)
209                                         err(1, "fork failed");
210                                 else if (pid == 0) {
211                                         execlp("sort", "sort", "-o", outfile,
212                                             outfile, NULL);
213                                         err(1, "exec of sort failed");
214                                 }
215                                 /* Just assume the sort went OK. The old code
216                                    did not do any checks either. */
217                                 (void)wait(NULL);
218                         }
219                 }
220         }
221         exit(exit_val);
222 }
223
224 static void
225 usage(void)
226 {
227         (void)fprintf(stderr, "usage: ctags [-BFTaduwvx] [-f tagsfile] file ...\n");
228         exit(1);
229 }
230
231 /*
232  * init --
233  *      this routine sets up the boolean pseudo-functions which work by
234  *      setting boolean flags dependent upon the corresponding character.
235  *      Every char which is NOT in that string is false with respect to
236  *      the pseudo-function.  Therefore, all of the array "_wht" is NO
237  *      by default and then the elements subscripted by the chars in
238  *      CWHITE are set to YES.  Thus, "_wht" of a char is YES if it is in
239  *      the string CWHITE, else NO.
240  */
241 void
242 init(void)
243 {
244         int             i;
245         const unsigned char     *sp;
246
247         for (i = 0; i < 256; i++) {
248                 _wht[i] = _etk[i] = _itk[i] = _btk[i] = NO;
249                 _gd[i] = YES;
250         }
251 #define CWHITE  " \f\t\n"
252         for (sp = CWHITE; *sp; sp++)    /* white space chars */
253                 _wht[*sp] = YES;
254 #define CTOKEN  " \t\n\"'#()[]{}=-+%*/&|^~!<>;,.:?"
255         for (sp = CTOKEN; *sp; sp++)    /* token ending chars */
256                 _etk[*sp] = YES;
257 #define CINTOK  "ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz0123456789"
258         for (sp = CINTOK; *sp; sp++)    /* valid in-token chars */
259                 _itk[*sp] = YES;
260 #define CBEGIN  "ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz"
261         for (sp = CBEGIN; *sp; sp++)    /* token starting chars */
262                 _btk[*sp] = YES;
263 #define CNOTGD  ",;"
264         for (sp = CNOTGD; *sp; sp++)    /* invalid after-function chars */
265                 _gd[*sp] = NO;
266 }
267
268 /*
269  * find_entries --
270  *      this routine opens the specified file and calls the function
271  *      which searches the file.
272  */
273 void
274 find_entries(char *file)
275 {
276         char    *cp;
277
278         lineno = 0;                             /* should be 1 ?? KB */
279         if ((cp = strrchr(file, '.'))) {
280                 if (cp[1] == 'l' && !cp[2]) {
281                         int     c;
282
283                         for (;;) {
284                                 if (GETC(==, EOF))
285                                         return;
286                                 if (!iswhite(c)) {
287                                         rewind(inf);
288                                         break;
289                                 }
290                         }
291 #define LISPCHR ";(["
292 /* lisp */              if (strchr(LISPCHR, c)) {
293                                 l_entries();
294                                 return;
295                         }
296 /* lex */               else {
297                                 /*
298                                  * we search all 3 parts of a lex file
299                                  * for C references.  This may be wrong.
300                                  */
301                                 toss_yysec();
302                                 (void)strcpy(lbuf, "%%$");
303                                 pfnote("yylex", lineno);
304                                 rewind(inf);
305                         }
306                 }
307 /* yacc */      else if (cp[1] == 'y' && !cp[2]) {
308                         /*
309                          * we search only the 3rd part of a yacc file
310                          * for C references.  This may be wrong.
311                          */
312                         toss_yysec();
313                         (void)strcpy(lbuf, "%%$");
314                         pfnote("yyparse", lineno);
315                         y_entries();
316                 }
317 /* fortran */   else if ((cp[1] != 'c' && cp[1] != 'h') && !cp[2]) {
318                         if (PF_funcs())
319                                 return;
320                         rewind(inf);
321                 }
322         }
323 /* C */ c_entries();
324 }