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97#include <sys/types.h>
98#include <sys/stat.h>
99#include <unistd.h>
100#include <fcntl.h>
101#include <string.h>
102#include <stdlib.h>
103#include <stdio.h>
104#include <ctype.h>
105
106static void usage(void)
107{
108 fprintf(stderr, "Usage: fixdep [-e] <depfile> <target> <cmdline>\n");
109 fprintf(stderr, " -e insert extra dependencies given on stdin\n");
110 exit(1);
111}
112
113
114
115
116static void print_dep(const char *m, int slen, const char *dir)
117{
118 int c, i;
119
120 printf(" $(wildcard %s/", dir);
121 for (i = 0; i < slen; i++) {
122 c = m[i];
123 if (c == '_')
124 c = '/';
125 else
126 c = tolower(c);
127 putchar(c);
128 }
129 printf(".h) \\\n");
130}
131
132static void do_extra_deps(void)
133{
134 char buf[80];
135
136 while (fgets(buf, sizeof(buf), stdin)) {
137 int len = strlen(buf);
138
139 if (len < 2 || buf[len - 1] != '\n') {
140 fprintf(stderr, "fixdep: bad data on stdin\n");
141 exit(1);
142 }
143 print_dep(buf, len - 1, "include/ksym");
144 }
145}
146
147struct item {
148 struct item *next;
149 unsigned int len;
150 unsigned int hash;
151 char name[0];
152};
153
154#define HASHSZ 256
155static struct item *hashtab[HASHSZ];
156
157static unsigned int strhash(const char *str, unsigned int sz)
158{
159
160 unsigned int i, hash = 2166136261U;
161
162 for (i = 0; i < sz; i++)
163 hash = (hash ^ str[i]) * 0x01000193;
164 return hash;
165}
166
167
168
169
170static int is_defined_config(const char *name, int len, unsigned int hash)
171{
172 struct item *aux;
173
174 for (aux = hashtab[hash % HASHSZ]; aux; aux = aux->next) {
175 if (aux->hash == hash && aux->len == len &&
176 memcmp(aux->name, name, len) == 0)
177 return 1;
178 }
179 return 0;
180}
181
182
183
184
185static void define_config(const char *name, int len, unsigned int hash)
186{
187 struct item *aux = malloc(sizeof(*aux) + len);
188
189 if (!aux) {
190 perror("fixdep:malloc");
191 exit(1);
192 }
193 memcpy(aux->name, name, len);
194 aux->len = len;
195 aux->hash = hash;
196 aux->next = hashtab[hash % HASHSZ];
197 hashtab[hash % HASHSZ] = aux;
198}
199
200
201
202
203static void use_config(const char *m, int slen)
204{
205 unsigned int hash = strhash(m, slen);
206
207 if (is_defined_config(m, slen, hash))
208 return;
209
210 define_config(m, slen, hash);
211 print_dep(m, slen, "include/config");
212}
213
214
215static int str_ends_with(const char *s, int slen, const char *sub)
216{
217 int sublen = strlen(sub);
218
219 if (sublen > slen)
220 return 0;
221
222 return !memcmp(s + slen - sublen, sub, sublen);
223}
224
225static void parse_config_file(const char *p)
226{
227 const char *q, *r;
228 const char *start = p;
229
230 while ((p = strstr(p, "CONFIG_"))) {
231 if (p > start && (isalnum(p[-1]) || p[-1] == '_')) {
232 p += 7;
233 continue;
234 }
235 p += 7;
236 q = p;
237 while (*q && (isalnum(*q) || *q == '_'))
238 q++;
239 if (str_ends_with(p, q - p, "_MODULE"))
240 r = q - 7;
241 else
242 r = q;
243 if (r > p)
244 use_config(p, r - p);
245 p = q;
246 }
247}
248
249static void *read_file(const char *filename)
250{
251 struct stat st;
252 int fd;
253 char *buf;
254
255 fd = open(filename, O_RDONLY);
256 if (fd < 0) {
257 fprintf(stderr, "fixdep: error opening file: ");
258 perror(filename);
259 exit(2);
260 }
261 if (fstat(fd, &st) < 0) {
262 fprintf(stderr, "fixdep: error fstat'ing file: ");
263 perror(filename);
264 exit(2);
265 }
266 buf = malloc(st.st_size + 1);
267 if (!buf) {
268 perror("fixdep: malloc");
269 exit(2);
270 }
271 if (read(fd, buf, st.st_size) != st.st_size) {
272 perror("fixdep: read");
273 exit(2);
274 }
275 buf[st.st_size] = '\0';
276 close(fd);
277
278 return buf;
279}
280
281
282static int is_ignored_file(const char *s, int len)
283{
284 return str_ends_with(s, len, "include/generated/autoconf.h") ||
285 str_ends_with(s, len, "include/generated/autoksyms.h") ||
286 str_ends_with(s, len, ".ver");
287}
288
289
290
291
292
293
294static void parse_dep_file(char *m, const char *target, int insert_extra_deps)
295{
296 char *p;
297 int is_last, is_target;
298 int saw_any_target = 0;
299 int is_first_dep = 0;
300 void *buf;
301
302 while (1) {
303
304 while (*m == ' ' || *m == '\\' || *m == '\n')
305 m++;
306
307 if (!*m)
308 break;
309
310
311 p = m;
312 while (*p && *p != ' ' && *p != '\\' && *p != '\n')
313 p++;
314 is_last = (*p == '\0');
315
316 is_target = (*(p-1) == ':');
317
318 if (is_target) {
319
320 is_first_dep = 1;
321 } else if (!is_ignored_file(m, p - m)) {
322 *p = '\0';
323
324
325
326
327
328
329
330 if (is_first_dep) {
331
332
333
334
335
336
337
338
339 if (!saw_any_target) {
340 saw_any_target = 1;
341 printf("source_%s := %s\n\n",
342 target, m);
343 printf("deps_%s := \\\n", target);
344 }
345 is_first_dep = 0;
346 } else {
347 printf(" %s \\\n", m);
348 }
349
350 buf = read_file(m);
351 parse_config_file(buf);
352 free(buf);
353 }
354
355 if (is_last)
356 break;
357
358
359
360
361
362 m = p + 1;
363 }
364
365 if (!saw_any_target) {
366 fprintf(stderr, "fixdep: parse error; no targets found\n");
367 exit(1);
368 }
369
370 if (insert_extra_deps)
371 do_extra_deps();
372
373 printf("\n%s: $(deps_%s)\n\n", target, target);
374 printf("$(deps_%s):\n", target);
375}
376
377int main(int argc, char *argv[])
378{
379 const char *depfile, *target, *cmdline;
380 int insert_extra_deps = 0;
381 void *buf;
382
383 if (argc == 5 && !strcmp(argv[1], "-e")) {
384 insert_extra_deps = 1;
385 argv++;
386 } else if (argc != 4)
387 usage();
388
389 depfile = argv[1];
390 target = argv[2];
391 cmdline = argv[3];
392
393 printf("cmd_%s := %s\n\n", target, cmdline);
394
395 buf = read_file(depfile);
396 parse_dep_file(buf, target, insert_extra_deps);
397 free(buf);
398
399 return 0;
400}
401