1/*
2 * gethost.c: Create version file from prototype
3 */
4/*-
5 * Copyright (c) 1980, 1991 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32#include "sh.h"
33
34#ifdef SCO
35# define perror __perror
36# define rename __rename
37# define getopt __getopt
38# define system __system
39#endif
40#include <stdio.h>
41#ifdef SCO
42# undef perror
43# undef rename
44# undef getopt
45# undef system
46#endif
47
48#include <ctype.h>
49
50#define ISSPACE(p)	(isspace((unsigned char) (p)) && (p) != '\n')
51
52/*
53 * We cannot do that, because some compilers like #line and others
54 * like # <lineno>
55 * #define LINEDIRECTIVE
56 */
57
58static const char *keyword[] =
59{
60    "vendor",
61#define T_VENDOR	0
62    "hosttype",
63#define T_HOSTTYPE	1
64    "machtype",
65#define T_MACHTYPE	2
66    "ostype",
67#define T_OSTYPE	3
68    "newdef",
69#define T_NEWDEF	4
70    "enddef",
71#define T_ENDDEF	5
72    "newcode",
73#define T_NEWCODE	6
74    "endcode",
75#define T_ENDCODE	7
76    "comment",
77#define T_COMMENT	8
78    "macro",
79#define T_MACRO		9
80    NULL
81#define T_NONE		10
82};
83
84#define S_DISCARD	0
85#define S_COMMENT	1
86#define S_CODE		2
87#define S_KEYWORD	3
88
89static int findtoken (char *);
90static char *gettoken (char **, char  *);
91static char *pname;
92
93int main (int, char *[]);
94
95/* findtoken():
96 *	Return the token number of the given token
97 */
98static int
99findtoken(char *ptr)
100{
101    int i;
102
103    if (ptr == NULL || *ptr == '\0')
104	return T_NONE;
105
106    for (i = 0; keyword[i] != NULL; i++)
107	if (strcmp(keyword[i], ptr) == 0)
108	    return i;
109
110    return T_NONE;
111}
112
113
114/* gettoken():
115 *	Get : delimited token and remove leading/trailing blanks/newlines
116 */
117static char *
118gettoken(char **pptr, char *token)
119{
120    char *ptr = *pptr;
121    char *tok = token;
122
123    for (; *ptr && ISSPACE(*ptr); ptr++)
124	continue;
125
126    for (; *ptr && *ptr != ':'; *tok++ = *ptr++)
127	continue;
128
129    if (*ptr == ':')
130	ptr++;
131    else
132	tok--;
133
134    for (tok--; tok >= token && *tok && ISSPACE(*tok); tok--)
135	continue;
136
137    *++tok = '\0';
138
139    *pptr = ptr;
140    return token;
141}
142
143static char *
144cat(const char *a, const char *b, size_t len)
145{
146	size_t l;
147	char *r;
148
149	if (len == 0)
150		len = strlen(b) + 1;
151	if (a)
152	    l = strlen(a) + len;
153	else
154	    l = len;
155	if ((r = malloc(l)) == NULL)
156		abort();
157	if (a)
158	    snprintf(r, l, "%s%.*s", a, (int)len, b);
159	else
160	    snprintf(r, l, "%.*s", (int)len, b);
161	return r;
162}
163
164static const char *
165explode(const char *defs)
166{
167	static const char def[] = "defined("; /* ) */
168	static char *buf;
169	size_t len;
170	const char *ptr, *bptr, *eptr = NULL, *name;
171
172	if (strstr(defs, "#machine(" /* ) */))
173		return defs;
174	if (!strstr(defs, def))
175		return defs;
176
177	free(buf);
178	buf = NULL;
179	for (ptr = defs; (bptr = strstr(ptr, def)) != NULL; ptr = eptr + 1) {
180		if (ptr != bptr)
181			buf = cat(buf, ptr, bptr - ptr + 1);
182		buf = cat(buf, "(", 0); /* ) */
183		if ((eptr = strchr(ptr + sizeof(def) - 1, ')')) == NULL) {
184			(void) fprintf(stderr, "%s: missing close paren `%s'\n",
185			    pname, defs);
186			free(buf);
187			return defs;
188		}
189		buf = cat(buf, bptr, eptr - bptr + 1);
190		name = bptr + sizeof(def) - 1;
191		len = eptr - name;
192		if (len < 1) {
193			(void) fprintf(stderr, "%s: empty define `%s'\n",
194			    pname, defs);
195			free(buf);
196			return defs;
197		}
198		if (*name != '_' && (*name != 'M' && name[1] != '_')) {
199			char *undername = malloc(len + 10);
200			if (undername == NULL)
201				abort();
202			buf = cat(buf, ") || defined(", 0);
203			snprintf(undername, len + 10, "__%.*s__)", (int)len,
204			    name);
205			buf = cat(buf, undername, len + 5);
206			buf = cat(buf, ") || defined(", 0);
207			snprintf(undername, len + 10, "__%.*s)", (int)len,
208			    name);
209			buf = cat(buf, undername, len + 3);
210		}
211		buf = cat(buf, "))", 0);
212	}
213	if (!eptr) {
214	    (void) fprintf(stderr, "%s: invalid input `%s'\n", pname, defs);
215	    return defs;
216        }
217	buf = cat(buf, eptr + 1, 0);
218	return buf;
219}
220
221
222int
223main(int argc, char *argv[])
224{
225    char line[INBUFSIZE];
226    const char *fname = "stdin";
227    char *ptr, *tok;
228    char defs[INBUFSIZE];
229    char stmt[INBUFSIZE];
230    FILE *fp = stdin;
231    int lineno = 0;
232    int inprocess = 0;
233    int token, state;
234    int errs = 0;
235
236    if ((pname = strrchr(argv[0], '/')) == NULL)
237	pname = argv[0];
238    else
239	pname++;
240
241    if (argc > 2) {
242	(void) fprintf(stderr, "Usage: %s [<filename>]\n", pname);
243	return 1;
244    }
245
246    if (argc == 2)
247	if ((fp = fopen(fname = argv[1], "r")) == NULL) {
248	    (void) fprintf(stderr, "%s: Cannot open `%s'\n", pname, fname);
249	    return 1;
250	}
251
252    state = S_DISCARD;
253
254    while ((ptr = fgets(line, sizeof(line), fp)) != NULL) {
255	lineno++;
256	switch (token = findtoken(gettoken(&ptr, defs))) {
257	case T_NEWCODE:
258	    state = S_CODE;
259	    break;
260
261	case T_ENDCODE:
262	    state = S_DISCARD;
263	    break;
264
265	case T_COMMENT:
266	    state = S_COMMENT;
267	    break;
268
269	case T_NEWDEF:
270	    state = S_KEYWORD;
271	    break;
272
273	case T_ENDDEF:
274	    state = S_DISCARD;
275	    break;
276
277	case T_VENDOR:
278	    state = S_KEYWORD;
279	    break;
280
281	case T_HOSTTYPE:
282	    state = S_KEYWORD;
283	    break;
284
285	case T_MACHTYPE:
286	    state = S_KEYWORD;
287	    break;
288
289	case T_OSTYPE:
290	    state = S_KEYWORD;
291	    break;
292
293	case T_MACRO:
294	    if (gettoken(&ptr, defs) == NULL) {
295		(void) fprintf(stderr, "%s: \"%s\", %d: Missing macro name\n",
296			       pname, fname, lineno);
297		break;
298	    }
299	    if (gettoken(&ptr, stmt) == NULL) {
300		(void) fprintf(stderr, "%s: \"%s\", %d: Missing macro body\n",
301			       pname, fname, lineno);
302		break;
303	    }
304	    (void) fprintf(stdout, "\n#if %s\n# define %s\n#endif\n\n",
305		explode(stmt), defs);
306	    break;
307
308	case T_NONE:
309	    if (state != S_CODE && *defs != '\0') {
310		(void) fprintf(stderr, "%s: \"%s\", %d: Discarded\n",
311			       pname, fname, lineno);
312		if (++errs == 30) {
313		    (void) fprintf(stderr, "%s: Too many errors\n", pname);
314		    return 1;
315		}
316		break;
317	    }
318	    (void) fprintf(stdout, "%s", line);
319	    break;
320
321	default:
322	    (void) fprintf(stderr, "%s: \"%s\", %d: Unexpected token\n",
323			   pname, fname, lineno);
324	    return 1;
325	}
326
327	switch (state) {
328	case S_DISCARD:
329	    if (inprocess) {
330		inprocess = 0;
331		(void) fprintf(stdout, "#endif\n");
332	    }
333	    break;
334
335	case S_KEYWORD:
336	    tok = gettoken(&ptr, defs);
337	    if (token == T_NEWDEF) {
338		if (inprocess) {
339		    (void) fprintf(stderr, "%s: \"%s\", %d: Missing enddef\n",
340				   pname, fname, lineno);
341		    return 1;
342		}
343		if (tok == NULL) {
344		    (void) fprintf(stderr, "%s: \"%s\", %d: No defs\n",
345				   pname, fname, lineno);
346		    return 1;
347		}
348		(void) fprintf(stdout, "\n\n");
349#ifdef LINEDIRECTIVE
350		(void) fprintf(stdout, "# %d \"%s\"\n", lineno + 1, fname);
351#endif /* LINEDIRECTIVE */
352		(void) fprintf(stdout, "#if (%s)\n", explode(defs));
353		inprocess = 1;
354	    }
355	    else {
356		if (tok && *tok)
357		    (void) fprintf(stdout, "# if (%s) && !defined(_%s_)\n",
358				   explode(defs), keyword[token]);
359		else
360		    (void) fprintf(stdout, "# if !defined(_%s_)\n",
361				   keyword[token]);
362
363		if (gettoken(&ptr, stmt) == NULL) {
364		    (void) fprintf(stderr, "%s: \"%s\", %d: No statement\n",
365				   pname, fname, lineno);
366		    return 1;
367		}
368		(void) fprintf(stdout, "# define _%s_\n", keyword[token]);
369		(void) fprintf(stdout, "    %s = %s;\n", keyword[token], stmt);
370		(void) fprintf(stdout, "# endif\n");
371	    }
372	    break;
373
374	case S_COMMENT:
375	    if (gettoken(&ptr, defs))
376		(void) fprintf(stdout, "    /* %s */\n", defs);
377	    break;
378
379	case S_CODE:
380	    if (token == T_NEWCODE) {
381#ifdef LINEDIRECTIVE
382		(void) fprintf(stdout, "# %d \"%s\"\n", lineno + 1, fname);
383#endif /* LINEDIRECTIVE */
384	    }
385	    break;
386
387	default:
388	    (void) fprintf(stderr, "%s: \"%s\", %d: Unexpected state\n",
389			   pname, fname, lineno);
390	    return 1;
391	}
392    }
393
394    if (inprocess) {
395	(void) fprintf(stderr, "%s: \"%s\", %d: Missing enddef\n",
396		       pname, fname, lineno);
397	return 1;
398    }
399
400    if (fp != stdin)
401	(void) fclose(fp);
402
403    return 0;
404}
405