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/contrib/tcsh/gethost.c

https://bitbucket.org/freebsd/freebsd-head/
C | 395 lines | 299 code | 53 blank | 43 comment | 73 complexity | 490fb44f86fda66d4055a35f260724fc MD5 | raw file
  1/* $Header: /p/tcsh/cvsroot/tcsh/gethost.c,v 1.15 2012/01/15 17:14:54 christos Exp $ */
  2/*
  3 * gethost.c: Create version file from prototype
  4 */
  5/*-
  6 * Copyright (c) 1980, 1991 The Regents of the University of California.
  7 * All rights reserved.
  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. Neither the name of the University nor the names of its contributors
 18 *    may be used to endorse or promote products derived from this software
 19 *    without specific prior written permission.
 20 *
 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 31 * SUCH DAMAGE.
 32 */
 33#include "sh.h"
 34
 35RCSID("$tcsh: gethost.c,v 1.15 2012/01/15 17:14:54 christos Exp $")
 36
 37#ifdef SCO
 38# define perror __perror
 39# define rename __rename
 40# define getopt __getopt
 41# define system __system
 42#endif
 43#include <stdio.h>
 44#ifdef SCO
 45# undef perror
 46# undef rename
 47# undef getopt
 48# undef system
 49#endif
 50
 51#include <ctype.h>
 52
 53#define ISSPACE(p)	(isspace((unsigned char) (p)) && (p) != '\n')
 54
 55/* 
 56 * We cannot do that, because some compilers like #line and others
 57 * like # <lineno>
 58 * #define LINEDIRECTIVE 
 59 */
 60
 61static const char *keyword[] =
 62{
 63    "vendor",
 64#define T_VENDOR	0
 65    "hosttype",
 66#define T_HOSTTYPE	1
 67    "machtype",
 68#define T_MACHTYPE	2
 69    "ostype",
 70#define T_OSTYPE	3
 71    "newdef",
 72#define T_NEWDEF	4
 73    "enddef",
 74#define T_ENDDEF	5
 75    "newcode",
 76#define T_NEWCODE	6
 77    "endcode",
 78#define T_ENDCODE	7
 79    "comment",
 80#define T_COMMENT	8
 81    "macro",
 82#define T_MACRO		9
 83    NULL
 84#define T_NONE		10
 85};
 86
 87#define S_DISCARD	0
 88#define S_COMMENT	1
 89#define S_CODE		2
 90#define S_KEYWORD	3
 91
 92static int findtoken (char *);
 93static char *gettoken (char **, char  *);
 94static char *pname;
 95
 96int main (int, char *[]);
 97
 98/* findtoken():
 99 *	Return the token number of the given token
100 */
101static int
102findtoken(char *ptr)
103{
104    int i;
105
106    if (ptr == NULL || *ptr == '\0')
107	return T_NONE;
108
109    for (i = 0; keyword[i] != NULL; i++)
110	if (strcmp(keyword[i], ptr) == 0)
111	    return i;
112
113    return T_NONE;
114}
115
116
117/* gettoken():
118 *	Get : delimited token and remove leading/trailing blanks/newlines
119 */
120static char *
121gettoken(char **pptr, char *token)
122{
123    char *ptr = *pptr;
124    char *tok = token;
125
126    for (; *ptr && ISSPACE(*ptr); ptr++)
127	continue;
128
129    for (; *ptr && *ptr != ':'; *tok++ = *ptr++)
130	continue;
131
132    if (*ptr == ':')
133	ptr++;
134    else
135	tok--;
136
137    for (tok--; tok >= token && *tok && ISSPACE(*tok); tok--)
138	continue;
139
140    *++tok = '\0';
141
142    *pptr = ptr;
143    return token;
144}
145
146static char *
147cat(const char *a, const char *b, size_t len)
148{
149	size_t l;
150	char *r;
151
152	if (len == 0)
153		len = strlen(b);
154	l = strlen(a) + len + 1;
155	if ((r = malloc(l)) == NULL)
156		abort();
157	snprintf(r, l, "%s%.*s", a, (int)len, b);
158	return r;
159}
160
161static const char *
162explode(const char *defs)
163{
164	static const char def[] = "defined("; /* ) */
165	static char *buf;
166	size_t len;
167	const char *ptr, *bptr, *eptr = NULL, *name;
168	size_t buflen = 0;
169
170	if (strstr(defs, "#machine(" /* ) */))
171		return defs;
172
173	free(buf);
174	buf = strdup("("); /* ) */
175	for (ptr = defs; (bptr = strstr(ptr, def)) != NULL; ptr = eptr + 1) {
176		if (ptr != bptr)
177			buf = cat(buf, ptr, bptr - ptr);
178		if ((eptr = strchr(ptr + sizeof(def) - 1, ')')) == NULL) {
179			(void) fprintf(stderr, "%s: missing close paren `%s'\n",
180			    pname, defs);
181			return defs;
182		}
183		buf = cat(buf, bptr, eptr - bptr + 1);
184		name = bptr + sizeof(def) - 1;
185		len = eptr - name;
186		if (len < 1) {
187			(void) fprintf(stderr, "%s: empty define `%s'\n",
188			    pname, defs);
189			return defs;
190		}
191		if (*name != '_') {
192			char *undername = malloc(len + 10);
193			buf = cat(buf, " || defined(", 0);
194			snprintf(undername, len + 10, "__%.*s__)", (int)len,
195			    name);
196			buf = cat(buf, undername, len + 5);
197			buf = cat(buf, " || defined(", 0);
198			snprintf(undername, len + 10, "__%.*s)", (int)len,
199			    name);
200			buf = cat(buf, undername, len + 3);
201		}
202	}
203	if (!eptr) {
204	    (void) fprintf(stderr, "%s: invalid input `%s'\n", pname, defs);
205	    return defs;
206        }
207	buf = cat(buf, eptr + 1, 0);
208	buf = cat(buf, ")", 0);
209	return buf;
210}
211	
212
213int
214main(int argc, char *argv[])
215{
216    char line[INBUFSIZE];
217    const char *fname = "stdin";
218    char *ptr, *tok;
219    char defs[INBUFSIZE];
220    char stmt[INBUFSIZE];
221    FILE *fp = stdin;
222    int lineno = 0;
223    int inprocess = 0;
224    int token, state;
225    int errs = 0;
226
227    if ((pname = strrchr(argv[0], '/')) == NULL)
228	pname = argv[0];
229    else
230	pname++;
231
232    if (argc > 2) {
233	(void) fprintf(stderr, "Usage: %s [<filename>]\n", pname);
234	return 1;
235    }
236
237    if (argc == 2)
238	if ((fp = fopen(fname = argv[1], "r")) == NULL) {
239	    (void) fprintf(stderr, "%s: Cannot open `%s'\n", pname, fname);
240	    return 1;
241	}
242
243    state = S_DISCARD;
244
245    while ((ptr = fgets(line, sizeof(line), fp)) != NULL) {
246	lineno++;
247	switch (token = findtoken(gettoken(&ptr, defs))) {
248	case T_NEWCODE:
249	    state = S_CODE;
250	    break;
251
252	case T_ENDCODE:
253	    state = S_DISCARD;
254	    break;
255
256	case T_COMMENT:
257	    state = S_COMMENT;
258	    break;
259
260	case T_NEWDEF:
261	    state = S_KEYWORD;
262	    break;
263
264	case T_ENDDEF:
265	    state = S_DISCARD;
266	    break;
267
268	case T_VENDOR:
269	    state = S_KEYWORD;
270	    break;
271
272	case T_HOSTTYPE:
273	    state = S_KEYWORD;
274	    break;
275
276	case T_MACHTYPE:
277	    state = S_KEYWORD;
278	    break;
279
280	case T_OSTYPE:
281	    state = S_KEYWORD;
282	    break;
283
284	case T_MACRO:
285	    if (gettoken(&ptr, defs) == NULL) {
286		(void) fprintf(stderr, "%s: \"%s\", %d: Missing macro name\n",
287			       pname, fname, lineno);
288		break;
289	    }
290	    if (gettoken(&ptr, stmt) == NULL) {
291		(void) fprintf(stderr, "%s: \"%s\", %d: Missing macro body\n",
292			       pname, fname, lineno);
293		break;
294	    }
295	    (void) fprintf(stdout, "\n#if %s\n# define %s\n#endif\n\n", stmt,
296			   defs);
297	    break;
298
299	case T_NONE:
300	    if (state != S_CODE && *defs != '\0') {
301		(void) fprintf(stderr, "%s: \"%s\", %d: Discarded\n",
302			       pname, fname, lineno);
303		if (++errs == 30) {
304		    (void) fprintf(stderr, "%s: Too many errors\n", pname);
305		    return 1;
306		}
307		break;
308	    }
309	    (void) fprintf(stdout, "%s", line);
310	    break;
311
312	default:
313	    (void) fprintf(stderr, "%s: \"%s\", %d: Unexpected token\n",
314			   pname, fname, lineno);
315	    return 1;
316	}
317
318	switch (state) {
319	case S_DISCARD:
320	    if (inprocess) {
321		inprocess = 0;
322		(void) fprintf(stdout, "#endif\n");
323	    }
324	    break;
325
326	case S_KEYWORD:
327	    tok = gettoken(&ptr, defs);
328	    if (token == T_NEWDEF) {
329		if (inprocess) {
330		    (void) fprintf(stderr, "%s: \"%s\", %d: Missing enddef\n",
331				   pname, fname, lineno);
332		    return 1;
333		}
334		if (tok == NULL) {
335		    (void) fprintf(stderr, "%s: \"%s\", %d: No defs\n",
336				   pname, fname, lineno);
337		    return 1;
338		}
339		(void) fprintf(stdout, "\n\n");
340#ifdef LINEDIRECTIVE
341		(void) fprintf(stdout, "# %d \"%s\"\n", lineno + 1, fname);
342#endif /* LINEDIRECTIVE */
343		(void) fprintf(stdout, "#if %s\n", defs);
344		inprocess = 1;
345	    }
346	    else {
347		if (tok && *tok)
348		    (void) fprintf(stdout, "# if (%s) && !defined(_%s_)\n",
349				   explode(defs), keyword[token]);
350		else
351		    (void) fprintf(stdout, "# if !defined(_%s_)\n", 
352				   keyword[token]);
353
354		if (gettoken(&ptr, stmt) == NULL) {
355		    (void) fprintf(stderr, "%s: \"%s\", %d: No statement\n",
356				   pname, fname, lineno);
357		    return 1;
358		}
359		(void) fprintf(stdout, "# define _%s_\n", keyword[token]);
360		(void) fprintf(stdout, "    %s = %s;\n", keyword[token], stmt);
361		(void) fprintf(stdout, "# endif\n");
362	    }
363	    break;
364
365	case S_COMMENT:
366	    if (gettoken(&ptr, defs))
367		(void) fprintf(stdout, "    /* %s */\n", defs);
368	    break;
369
370	case S_CODE:
371	    if (token == T_NEWCODE) {
372#ifdef LINEDIRECTIVE
373		(void) fprintf(stdout, "# %d \"%s\"\n", lineno + 1, fname);
374#endif /* LINEDIRECTIVE */
375	    }
376	    break;
377
378	default:
379	    (void) fprintf(stderr, "%s: \"%s\", %d: Unexpected state\n",
380			   pname, fname, lineno);
381	    return 1;
382	}
383    }
384
385    if (inprocess) {
386	(void) fprintf(stderr, "%s: \"%s\", %d: Missing enddef\n",
387		       pname, fname, lineno);
388	return 1;
389    }
390
391    if (fp != stdin)
392	(void) fclose(fp);
393
394    return 0;
395}