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