1 /* $NetBSD: mkdep.c,v 1.26 2005/12/12 22:49:37 wiz Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matthias Scheler. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #if HAVE_NBTOOL_CONFIG_H 40 #include "nbtool_config.h" 41 #endif 42 43 #include <sys/cdefs.h> 44 #if !defined(lint) 45 __COPYRIGHT("@(#) Copyright (c) 1999 The NetBSD Foundation, Inc.\n\ 46 All rights reserved.\n"); 47 __RCSID("$NetBSD: mkdep.c,v 1.26 2005/12/12 22:49:37 wiz Exp $"); 48 #endif /* not lint */ 49 50 #include <sys/mman.h> 51 #include <sys/param.h> 52 #include <sys/wait.h> 53 #include <ctype.h> 54 #include <err.h> 55 #include <fcntl.h> 56 #include <locale.h> 57 #include <paths.h> 58 #include <signal.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 64 #include "findcc.h" 65 66 typedef struct opt opt_t; 67 struct opt { 68 opt_t *left; 69 opt_t *right; 70 int len; 71 int count; 72 char name[4]; 73 }; 74 75 typedef struct { 76 int len; 77 char suff[12]; 78 } suff_list_t; 79 80 /* tree of includes for -o processing */ 81 opt_t *opt; 82 int width; 83 84 #define DEFAULT_PATH _PATH_DEFPATH 85 #define DEFAULT_FILENAME ".depend" 86 87 static void save_for_optional(const char *, const char *); 88 static int write_optional(int, opt_t *, int); 89 90 91 static inline void * 92 deconst(const void *p) 93 { 94 return (const char *)p - (const char *)0 + (char *)0; 95 } 96 97 static void 98 usage(void) 99 { 100 (void)fprintf(stderr, 101 "usage: %s [-aDdopq] [-f file] [-s suffixes] -- [flags] file ...\n", 102 getprogname()); 103 exit(EXIT_FAILURE); 104 } 105 106 static int 107 run_cc(int argc, char **argv, const char **fname) 108 { 109 const char *CC, *pathname, *tmpdir; 110 static char tmpfilename[MAXPATHLEN]; 111 char **args; 112 int tmpfd; 113 pid_t pid, cpid; 114 int status; 115 116 if ((CC = getenv("CC")) == NULL) 117 CC = DEFAULT_CC; 118 if ((pathname = findcc(CC)) == NULL) 119 if (!setenv("PATH", DEFAULT_PATH, 1)) 120 pathname = findcc(CC); 121 if (pathname == NULL) 122 err(EXIT_FAILURE, "%s: not found", CC); 123 if ((args = malloc((argc + 3) * sizeof(char *))) == NULL) 124 err(EXIT_FAILURE, "malloc"); 125 126 args[0] = deconst(CC); 127 args[1] = deconst("-M"); 128 (void)memcpy(&args[2], argv, (argc + 1) * sizeof(char *)); 129 130 if ((tmpdir = getenv("TMPDIR")) == NULL) 131 tmpdir = _PATH_TMP; 132 (void)snprintf(tmpfilename, sizeof (tmpfilename), "%s/%s", tmpdir, 133 "mkdepXXXXXX"); 134 if ((tmpfd = mkstemp(tmpfilename)) < 0) { 135 warn("unable to create temporary file %s", tmpfilename); 136 exit(EXIT_FAILURE); 137 } 138 (void)unlink(tmpfilename); 139 *fname = tmpfilename; 140 141 switch (cpid = vfork()) { 142 case 0: 143 (void)dup2(tmpfd, STDOUT_FILENO); 144 (void)close(tmpfd); 145 146 (void)execv(pathname, args); 147 _exit(EXIT_FAILURE); 148 /* NOTREACHED */ 149 150 case -1: 151 err(EXIT_FAILURE, "unable to fork"); 152 } 153 154 while (((pid = wait(&status)) != cpid) && (pid >= 0)) 155 continue; 156 157 if (status) 158 errx(EXIT_FAILURE, "compile failed."); 159 160 return tmpfd; 161 } 162 163 static const char * 164 read_fname(void) 165 { 166 static char *fbuf; 167 static int fbuflen; 168 int len, ch; 169 170 for (len = 0; (ch = getchar()) != EOF; len++) { 171 if (isspace(ch)) { 172 if (len != 0) 173 break; 174 len--; 175 continue; 176 } 177 if (len >= fbuflen - 1) { 178 fbuf = realloc(fbuf, fbuflen += 32); 179 if (fbuf == NULL) 180 err(EXIT_FAILURE, "no memory"); 181 } 182 fbuf[len] = ch; 183 } 184 if (len == 0) 185 return NULL; 186 fbuf[len] = 0; 187 return fbuf; 188 } 189 190 int 191 main(int argc, char **argv) 192 { 193 int aflag, dflag, oflag, qflag; 194 const char *filename; 195 int dependfile; 196 char *buf, *lim, *ptr, *line, *suf, *colon, *eol; 197 int ok_ind, ch; 198 int sz; 199 int fd; 200 const char *fname; 201 const char *suffixes = NULL, *s; 202 suff_list_t *suff_list = NULL, *sl; 203 204 suf = NULL; /* XXXGCC -Wuninitialized [sun2] */ 205 sl = NULL; /* XXXGCC -Wuninitialized [sun2] */ 206 207 setlocale(LC_ALL, ""); 208 setprogname(argv[0]); 209 210 aflag = O_WRONLY | O_APPEND | O_CREAT | O_TRUNC; 211 dflag = 0; 212 oflag = 0; 213 qflag = 0; 214 filename = DEFAULT_FILENAME; 215 dependfile = -1; 216 217 opterr = 0; /* stop getopt() bleating about errors. */ 218 for (;;) { 219 ok_ind = optind; 220 ch = getopt(argc, argv, "aDdf:opqs:"); 221 switch (ch) { 222 case -1: 223 ok_ind = optind; 224 break; 225 case 'a': /* Append to output file */ 226 aflag &= ~O_TRUNC; 227 continue; 228 case 'D': /* Process *.d files (don't run cc -M) */ 229 dflag = 2; /* Read names from stdin */ 230 opterr = 1; 231 continue; 232 case 'd': /* Process *.d files (don't run cc -M) */ 233 dflag = 1; 234 opterr = 1; 235 continue; 236 case 'f': /* Name of output file */ 237 filename = optarg; 238 continue; 239 case 'o': /* Mark dependant files .OPTIONAL */ 240 oflag = 1; 241 continue; 242 case 'p': /* Program mode (x.o: -> x:) */ 243 suffixes = ""; 244 continue; 245 case 'q': /* Quiet */ 246 qflag = 1; 247 continue; 248 case 's': /* Suffix list */ 249 suffixes = optarg; 250 continue; 251 default: 252 if (dflag) 253 usage(); 254 /* Unknown arguments are passed to "${CC} -M" */ 255 break; 256 } 257 break; 258 } 259 260 argc -= ok_ind; 261 argv += ok_ind; 262 if ((argc == 0 && !dflag) || (argc != 0 && dflag == 2)) 263 usage(); 264 265 if (suffixes != NULL) { 266 /* parse list once and save names and lengths */ 267 /* allocate an extra entry to mark end of list */ 268 for (sz = 1, s = suffixes; *s != 0; s++) 269 if (*s == '.') 270 sz++; 271 suff_list = calloc(sz, sizeof *suff_list); 272 if (suff_list == NULL) 273 err(2, "malloc"); 274 sl = suff_list; 275 for (s = suffixes; (s = strchr(s, '.')); s += sz, sl++ ) { 276 sz = strcspn(s, ", "); 277 if (sz > sizeof sl->suff) 278 errx(2, "suffix too long"); 279 sl->len = sz; 280 memcpy(sl->suff, s, sz); 281 } 282 } 283 284 dependfile = open(filename, aflag, 0666); 285 if (dependfile == -1) 286 err(EXIT_FAILURE, "unable to %s to file %s\n", 287 aflag & O_TRUNC ? "write" : "append", filename); 288 289 while (dflag == 2 || *argv != NULL) { 290 if (dflag) { 291 if (dflag == 2) { 292 fname = read_fname(); 293 if (fname == NULL) 294 break; 295 } else 296 fname = *argv++; 297 fd = open(fname, O_RDONLY, 0); 298 if (fd == -1) { 299 if (!qflag) 300 warn("ignoring %s", fname); 301 continue; 302 } 303 } else { 304 fd = run_cc(argc, argv, &fname); 305 /* consume all args... */ 306 argv += argc; 307 } 308 309 sz = lseek(fd, 0, SEEK_END); 310 if (sz == 0) { 311 close(fd); 312 continue; 313 } 314 buf = mmap(NULL, sz, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); 315 close(fd); 316 317 if (buf == MAP_FAILED) 318 err(EXIT_FAILURE, "unable to mmap file %s", fname); 319 lim = buf + sz - 1; 320 321 /* Remove leading "./" from filenames */ 322 for (ptr = buf; ptr < lim; ptr++) { 323 if (ptr[1] != '.' || ptr[2] != '/' 324 || !isspace((unsigned char)ptr[0])) 325 continue; 326 ptr[1] = ' '; 327 ptr[2] = ' '; 328 } 329 330 for (line = eol = buf; eol <= lim;) { 331 while (eol <= lim && *eol++ != '\n') 332 /* Find end of this line */ 333 continue; 334 if (line == eol - 1) { 335 /* empty line - ignore */ 336 line = eol; 337 continue; 338 } 339 if (eol[-2] == '\\') 340 /* Assemble continuation lines */ 341 continue; 342 for (colon = line; *colon != ':'; colon++) { 343 if (colon >= eol) { 344 colon = NULL; 345 break; 346 } 347 } 348 if (isspace((unsigned char)*line) || colon == NULL) { 349 /* No dependency - just transcribe line */ 350 write(dependfile, line, eol - line); 351 line = eol; 352 continue; 353 } 354 if (suff_list != NULL) { 355 /* Find the .o: */ 356 /* First allow for any whitespace */ 357 for (suf = colon; ; suf--) { 358 if (!isspace((unsigned char)suf[-1])) 359 break; 360 } 361 /* Then look for any valid suffix */ 362 for (sl = suff_list; sl->len != 0; sl++) { 363 if (!memcmp(suf - sl->len, sl->suff, 364 sl->len)) 365 break; 366 } 367 } 368 if (suff_list != NULL && sl->len != 0) { 369 suf -= sl->len; 370 for (sl = suff_list; sl->len != 0; sl++) { 371 if (sl != suff_list) 372 write(dependfile, " ", 1); 373 write(dependfile, line, suf - line); 374 write(dependfile, sl->suff, sl->len); 375 } 376 write(dependfile, colon, eol - colon); 377 } else 378 write(dependfile, line, eol - line); 379 380 if (oflag) 381 save_for_optional(colon + 1, eol); 382 line = eol; 383 } 384 munmap(buf, sz); 385 } 386 387 if (oflag && opt != NULL) { 388 write(dependfile, ".OPTIONAL:", 10); 389 width = 9; 390 sz = write_optional(dependfile, opt, 0); 391 /* 'depth' is about 39 for an i386 kernel */ 392 /* fprintf(stderr, "Recursion depth %d\n", sz); */ 393 } 394 close(dependfile); 395 396 exit(EXIT_SUCCESS); 397 } 398 399 400 /* 401 * Only save each file once - the kernel .depend is 3MB and there is 402 * no point doubling its size. 403 * The data seems to be 'random enough' so the simple binary tree 404 * only has a reasonable depth. 405 */ 406 static void 407 save_for_optional(const char *start, const char *limit) 408 { 409 opt_t **l, *n; 410 const char *name, *end; 411 int c; 412 413 while (start < limit && strchr(" \t\n\\", *start)) 414 start++; 415 for (name = start; ; name = end) { 416 while (name < limit && strchr(" \t\n\\", *name)) 417 name++; 418 for (end = name; end < limit && !strchr(" \t\n\\", *end);) 419 end++; 420 if (name >= limit) 421 break; 422 if (end[-1] == 'c' && end[-2] == '.' && name == start) 423 /* ignore dependency on the files own .c */ 424 continue; 425 for (l = &opt;;) { 426 n = *l; 427 if (n == NULL) { 428 n = malloc(sizeof *n + (end - name)); 429 n->left = n->right = 0; 430 n->len = end - name; 431 n->count = 1; 432 n->name[0] = ' '; 433 memcpy(n->name + 1, name, end - name); 434 *l = n; 435 break; 436 } 437 c = (end - name) - n->len; 438 if (c == 0) 439 c = memcmp(n->name + 1, name, (end - name)); 440 if (c == 0) { 441 /* Duplicate */ 442 n->count++; 443 break; 444 } 445 if (c < 0) 446 l = &n->left; 447 else 448 l = &n->right; 449 } 450 } 451 } 452 453 static int 454 write_optional(int fd, opt_t *node, int depth) 455 { 456 int d1 = ++depth; 457 458 if (node->left) 459 d1 = write_optional(fd, node->left, d1); 460 if (width > 76 - node->len) { 461 write(fd, " \\\n ", 4); 462 width = 1; 463 } 464 width += 1 + node->len; 465 write(fd, node->name, 1 + node->len); 466 if (node->right) 467 depth = write_optional(fd, node->right, depth); 468 return d1 > depth ? d1 : depth; 469 } 470