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92#include <sys/types.h>
93#include <sys/stat.h>
94#include <unistd.h>
95#include <fcntl.h>
96#include <string.h>
97#include <stdarg.h>
98#include <stdlib.h>
99#include <stdio.h>
100#include <ctype.h>
101
102static void usage(void)
103{
104 fprintf(stderr, "Usage: fixdep <depfile> <target> <cmdline>\n");
105 exit(1);
106}
107
108
109
110
111
112
113static void xprintf(const char *format, ...)
114{
115 va_list ap;
116 int ret;
117
118 va_start(ap, format);
119 ret = vprintf(format, ap);
120 if (ret < 0) {
121 perror("fixdep");
122 exit(1);
123 }
124 va_end(ap);
125}
126
127static void xputchar(int c)
128{
129 int ret;
130
131 ret = putchar(c);
132 if (ret == EOF) {
133 perror("fixdep");
134 exit(1);
135 }
136}
137
138
139
140
141static void print_dep(const char *m, int slen, const char *dir)
142{
143 int c, prev_c = '/', i;
144
145 xprintf(" $(wildcard %s/", dir);
146 for (i = 0; i < slen; i++) {
147 c = m[i];
148 if (c == '_')
149 c = '/';
150 else
151 c = tolower(c);
152 if (c != '/' || prev_c != '/')
153 xputchar(c);
154 prev_c = c;
155 }
156 xprintf(".h) \\\n");
157}
158
159struct item {
160 struct item *next;
161 unsigned int len;
162 unsigned int hash;
163 char name[];
164};
165
166#define HASHSZ 256
167static struct item *hashtab[HASHSZ];
168
169static unsigned int strhash(const char *str, unsigned int sz)
170{
171
172 unsigned int i, hash = 2166136261U;
173
174 for (i = 0; i < sz; i++)
175 hash = (hash ^ str[i]) * 0x01000193;
176 return hash;
177}
178
179
180
181
182static int is_defined_config(const char *name, int len, unsigned int hash)
183{
184 struct item *aux;
185
186 for (aux = hashtab[hash % HASHSZ]; aux; aux = aux->next) {
187 if (aux->hash == hash && aux->len == len &&
188 memcmp(aux->name, name, len) == 0)
189 return 1;
190 }
191 return 0;
192}
193
194
195
196
197static void define_config(const char *name, int len, unsigned int hash)
198{
199 struct item *aux = malloc(sizeof(*aux) + len);
200
201 if (!aux) {
202 perror("fixdep:malloc");
203 exit(1);
204 }
205 memcpy(aux->name, name, len);
206 aux->len = len;
207 aux->hash = hash;
208 aux->next = hashtab[hash % HASHSZ];
209 hashtab[hash % HASHSZ] = aux;
210}
211
212
213
214
215static void use_config(const char *m, int slen)
216{
217 unsigned int hash = strhash(m, slen);
218
219 if (is_defined_config(m, slen, hash))
220 return;
221
222 define_config(m, slen, hash);
223 print_dep(m, slen, "include/config");
224}
225
226
227static int str_ends_with(const char *s, int slen, const char *sub)
228{
229 int sublen = strlen(sub);
230
231 if (sublen > slen)
232 return 0;
233
234 return !memcmp(s + slen - sublen, sub, sublen);
235}
236
237static void parse_config_file(const char *p)
238{
239 const char *q, *r;
240 const char *start = p;
241
242 while ((p = strstr(p, "CONFIG_"))) {
243 if (p > start && (isalnum(p[-1]) || p[-1] == '_')) {
244 p += 7;
245 continue;
246 }
247 p += 7;
248 q = p;
249 while (isalnum(*q) || *q == '_')
250 q++;
251 if (str_ends_with(p, q - p, "_MODULE"))
252 r = q - 7;
253 else
254 r = q;
255 if (r > p)
256 use_config(p, r - p);
257 p = q;
258 }
259}
260
261static void *read_file(const char *filename)
262{
263 struct stat st;
264 int fd;
265 char *buf;
266
267 fd = open(filename, O_RDONLY);
268 if (fd < 0) {
269 fprintf(stderr, "fixdep: error opening file: ");
270 perror(filename);
271 exit(2);
272 }
273 if (fstat(fd, &st) < 0) {
274 fprintf(stderr, "fixdep: error fstat'ing file: ");
275 perror(filename);
276 exit(2);
277 }
278 buf = malloc(st.st_size + 1);
279 if (!buf) {
280 perror("fixdep: malloc");
281 exit(2);
282 }
283 if (read(fd, buf, st.st_size) != st.st_size) {
284 perror("fixdep: read");
285 exit(2);
286 }
287 buf[st.st_size] = '\0';
288 close(fd);
289
290 return buf;
291}
292
293
294static int is_ignored_file(const char *s, int len)
295{
296 return str_ends_with(s, len, "include/generated/autoconf.h") ||
297 str_ends_with(s, len, "include/generated/autoksyms.h");
298}
299
300
301
302
303
304
305static void parse_dep_file(char *m, const char *target)
306{
307 char *p;
308 int is_last, is_target;
309 int saw_any_target = 0;
310 int is_first_dep = 0;
311 void *buf;
312
313 while (1) {
314
315 while (*m == ' ' || *m == '\\' || *m == '\n')
316 m++;
317
318 if (!*m)
319 break;
320
321
322 p = m;
323 while (*p && *p != ' ' && *p != '\\' && *p != '\n')
324 p++;
325 is_last = (*p == '\0');
326
327 is_target = (*(p-1) == ':');
328
329 if (is_target) {
330
331 is_first_dep = 1;
332 } else if (!is_ignored_file(m, p - m)) {
333 *p = '\0';
334
335
336
337
338
339
340
341 if (is_first_dep) {
342
343
344
345
346
347
348
349
350 if (!saw_any_target) {
351 saw_any_target = 1;
352 xprintf("source_%s := %s\n\n",
353 target, m);
354 xprintf("deps_%s := \\\n", target);
355 }
356 is_first_dep = 0;
357 } else {
358 xprintf(" %s \\\n", m);
359 }
360
361 buf = read_file(m);
362 parse_config_file(buf);
363 free(buf);
364 }
365
366 if (is_last)
367 break;
368
369
370
371
372
373 m = p + 1;
374 }
375
376 if (!saw_any_target) {
377 fprintf(stderr, "fixdep: parse error; no targets found\n");
378 exit(1);
379 }
380
381 xprintf("\n%s: $(deps_%s)\n\n", target, target);
382 xprintf("$(deps_%s):\n", target);
383}
384
385int main(int argc, char *argv[])
386{
387 const char *depfile, *target, *cmdline;
388 void *buf;
389
390 if (argc != 4)
391 usage();
392
393 depfile = argv[1];
394 target = argv[2];
395 cmdline = argv[3];
396
397 xprintf("cmd_%s := %s\n\n", target, cmdline);
398
399 buf = read_file(depfile);
400 parse_dep_file(buf, target);
401 free(buf);
402
403 return 0;
404}
405