1 /* $NetBSD: mkdep.c,v 1.47 2021/08/20 05:45:19 rillig 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #if HAVE_NBTOOL_CONFIG_H 33 #include "nbtool_config.h" 34 #endif 35 36 #include <sys/cdefs.h> 37 #if !defined(lint) 38 __COPYRIGHT("@(#) Copyright (c) 1999 The NetBSD Foundation, Inc.\ 39 All rights reserved."); 40 __RCSID("$NetBSD: mkdep.c,v 1.47 2021/08/20 05:45:19 rillig Exp $"); 41 #endif /* not lint */ 42 43 #include <sys/mman.h> 44 #include <sys/param.h> 45 #include <sys/wait.h> 46 #include <ctype.h> 47 #include <err.h> 48 #include <fcntl.h> 49 #include <getopt.h> 50 #include <locale.h> 51 #include <paths.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 #include "findcc.h" 58 59 typedef struct opt opt_t; 60 struct opt { 61 opt_t *left; 62 opt_t *right; 63 int len; 64 int count; 65 char name[4]; 66 }; 67 68 typedef struct suff_list { 69 size_t len; 70 char *suff; 71 struct suff_list *next; 72 } suff_list_t; 73 74 /* tree of includes for -o processing */ 75 static opt_t *opt; 76 static int width; 77 static int verbose; 78 79 #define DEFAULT_PATH _PATH_DEFPATH 80 #define DEFAULT_FILENAME ".depend" 81 82 static void save_for_optional(const char *, const char *); 83 static size_t write_optional(int, opt_t *, size_t); 84 85 __dead static void 86 usage(void) 87 { 88 (void)fprintf(stderr, 89 "usage: %s [-aDdiopqv] [-f file] [-P prefix] [-s suffixes] " 90 "-- [flags] file ...\n", 91 getprogname()); 92 exit(EXIT_FAILURE); 93 } 94 95 static int 96 run_cc(int argc, char **argv, const char **fname) 97 { 98 const char *CC; 99 const char *tmpdir; 100 char * volatile pathname; 101 static char tmpfilename[MAXPATHLEN]; 102 char **args; 103 int tmpfd; 104 pid_t pid, cpid; 105 int status; 106 107 if ((CC = getenv("CC")) == NULL) 108 CC = DEFAULT_CC; 109 if ((pathname = findcc(CC)) == NULL) 110 if (!setenv("PATH", DEFAULT_PATH, 1)) 111 pathname = findcc(CC); 112 if (pathname == NULL) 113 err(EXIT_FAILURE, "%s: not found", CC); 114 if ((args = malloc((argc + 3) * sizeof(char *))) == NULL) 115 err(EXIT_FAILURE, "malloc"); 116 117 args[0] = __UNCONST(CC); 118 args[1] = __UNCONST("-M"); 119 (void)memcpy(&args[2], argv, (argc + 1) * sizeof(char *)); 120 121 if ((tmpdir = getenv("TMPDIR")) == NULL) 122 tmpdir = _PATH_TMP; 123 (void)snprintf(tmpfilename, sizeof (tmpfilename), "%s/%s", tmpdir, 124 "mkdepXXXXXX"); 125 if ((tmpfd = mkstemp(tmpfilename)) < 0) 126 err(EXIT_FAILURE, "Unable to create temporary file %s", 127 tmpfilename); 128 (void)unlink(tmpfilename); 129 *fname = tmpfilename; 130 131 if (verbose) { 132 char **a; 133 for (a = args; *a; a++) 134 printf("%s ", *a); 135 printf("\n"); 136 } 137 138 switch (cpid = vfork()) { 139 case 0: 140 (void)dup2(tmpfd, STDOUT_FILENO); 141 (void)close(tmpfd); 142 143 (void)execv(pathname, args); 144 _exit(EXIT_FAILURE); 145 /* NOTREACHED */ 146 147 case -1: 148 err(EXIT_FAILURE, "unable to fork"); 149 } 150 151 free(pathname); 152 free(args); 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 static struct option longopt[] = { 191 { "sysroot", 1, NULL, 'R' }, 192 { NULL, 0, NULL, '\0' }, 193 }; 194 195 static void 196 addsuff(suff_list_t **l, const char *s, size_t len) 197 { 198 suff_list_t *p = calloc(1, sizeof(*p)); 199 if (p == NULL) 200 err(1, "calloc"); 201 p->suff = malloc(len + 1); 202 if (p->suff == NULL) 203 err(1, "malloc"); 204 memcpy(p->suff, s, len); 205 p->suff[len] = '\0'; 206 p->len = len; 207 p->next = *l; 208 *l = p; 209 } 210 211 int 212 main(int argc, char **argv) 213 { 214 int aflag, dflag, iflag, oflag, qflag; 215 const char *filename; 216 int dependfile; 217 char *buf, *lim, *ptr, *line, *suf, *colon, *eol; 218 int ok_ind, ch; 219 size_t sz; 220 int fd; 221 size_t slen; 222 const char *fname; 223 const char *prefix = NULL; 224 const char *suffixes = NULL, *s; 225 suff_list_t *suff_list = NULL, *sl; 226 227 suf = NULL; /* XXXGCC -Wuninitialized [sun2] */ 228 sl = NULL; /* XXXGCC -Wuninitialized [sun2] */ 229 230 setlocale(LC_ALL, ""); 231 setprogname(argv[0]); 232 233 aflag = O_WRONLY | O_APPEND | O_CREAT | O_TRUNC; 234 dflag = 0; 235 iflag = 0; 236 oflag = 0; 237 qflag = 0; 238 filename = DEFAULT_FILENAME; 239 dependfile = -1; 240 241 opterr = 0; /* stop getopt() bleating about errors. */ 242 for (;;) { 243 ok_ind = optind; 244 ch = getopt_long(argc, argv, "aDdf:ioP:pqRs:v", longopt, NULL); 245 switch (ch) { 246 case -1: 247 ok_ind = optind; 248 break; 249 case 'a': /* Append to output file */ 250 aflag &= ~O_TRUNC; 251 continue; 252 case 'D': /* Process *.d files (don't run cc -M) */ 253 dflag = 2; /* Read names from stdin */ 254 opterr = 1; 255 continue; 256 case 'd': /* Process *.d files (don't run cc -M) */ 257 dflag = 1; 258 opterr = 1; 259 continue; 260 case 'f': /* Name of output file */ 261 filename = optarg; 262 continue; 263 case 'i': 264 iflag = 1; 265 continue; 266 case 'o': /* Mark dependent files .OPTIONAL */ 267 oflag = 1; 268 continue; 269 case 'P': /* Prefix for each target filename */ 270 prefix = optarg; 271 continue; 272 case 'p': /* Program mode (x.o: -> x:) */ 273 suffixes = ""; 274 continue; 275 case 'q': /* Quiet */ 276 qflag = 1; 277 continue; 278 case 'R': 279 /* sysroot = optarg */ 280 continue; 281 case 's': /* Suffix list */ 282 suffixes = optarg; 283 continue; 284 case 'v': 285 verbose = 1; 286 continue; 287 default: 288 if (dflag) 289 usage(); 290 /* Unknown arguments are passed to "${CC} -M" */ 291 break; 292 } 293 break; 294 } 295 296 argc -= ok_ind; 297 argv += ok_ind; 298 if ((argc == 0 && !dflag) || (argc != 0 && dflag == 2)) 299 usage(); 300 301 if (suffixes != NULL) { 302 if (*suffixes) { 303 for (s = suffixes; (sz = strcspn(s, ", ")) != 0;) { 304 addsuff(&suff_list, s, sz); 305 s += sz; 306 while (*s && strchr(", ", *s)) 307 s++; 308 } 309 } else 310 addsuff(&suff_list, "", 0); 311 } 312 313 dependfile = open(filename, aflag, 0666); 314 if (dependfile == -1) 315 goto wrerror; 316 317 while (dflag == 2 || *argv != NULL) { 318 if (dflag) { 319 if (dflag == 2) { 320 fname = read_fname(); 321 if (fname == NULL) 322 break; 323 } else 324 fname = *argv++; 325 if (iflag) { 326 if (dprintf(dependfile, ".-include \"%s\"\n", 327 fname) < 0) 328 goto wrerror; 329 continue; 330 } 331 fd = open(fname, O_RDONLY, 0); 332 if (fd == -1) { 333 if (!qflag) 334 warn("ignoring %s", fname); 335 continue; 336 } 337 } else { 338 fd = run_cc(argc, argv, &fname); 339 /* consume all args... */ 340 argv += argc; 341 } 342 343 sz = lseek(fd, 0, SEEK_END); 344 if (sz == 0) { 345 close(fd); 346 continue; 347 } 348 buf = mmap(NULL, sz, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); 349 close(fd); 350 351 if (buf == MAP_FAILED) 352 err(EXIT_FAILURE, "unable to mmap file %s", fname); 353 lim = buf + sz - 1; 354 355 /* Remove leading "./" from filenames */ 356 for (ptr = buf; ptr < lim; ptr++) { 357 if (ptr[1] != '.' || ptr[2] != '/' 358 || !isspace((unsigned char)ptr[0])) 359 continue; 360 ptr[1] = ' '; 361 ptr[2] = ' '; 362 } 363 364 for (line = eol = buf; eol <= lim;) { 365 while (eol <= lim && *eol++ != '\n') 366 /* Find end of this line */ 367 continue; 368 if (line == eol - 1) { 369 /* empty line - ignore */ 370 line = eol; 371 continue; 372 } 373 if (eol[-2] == '\\') 374 /* Assemble continuation lines */ 375 continue; 376 for (colon = line; *colon != ':'; colon++) { 377 if (colon >= eol) { 378 colon = NULL; 379 break; 380 } 381 } 382 if (isspace((unsigned char)*line) || colon == NULL) { 383 /* No dependency - just transcribe line */ 384 if (write(dependfile, line, eol - line) < 0) 385 goto wrerror; 386 line = eol; 387 continue; 388 } 389 if (suff_list != NULL) { 390 /* Find the .o: */ 391 /* First allow for any whitespace */ 392 for (suf = colon; suf > buf; suf--) { 393 if (!isspace((unsigned char)suf[-1])) 394 break; 395 } 396 if (suf == buf) 397 errx(EXIT_FAILURE, 398 "Corrupted file `%s'", fname); 399 /* Then look for any valid suffix */ 400 for (sl = suff_list; sl != NULL; 401 sl = sl->next) { 402 if (sl->len && buf <= suf - sl->len && 403 !memcmp(suf - sl->len, sl->suff, 404 sl->len)) 405 break; 406 } 407 /* 408 * Not found, check for .o, since the 409 * original file will have it. 410 */ 411 if (sl == NULL) { 412 if (memcmp(suf - 2, ".o", 2) == 0) 413 slen = 2; 414 else 415 slen = 0; 416 } else 417 slen = sl->len; 418 } 419 if (suff_list != NULL && slen != 0) { 420 suf -= slen; 421 for (sl = suff_list; sl != NULL; sl = sl->next) 422 { 423 if (sl != suff_list) 424 if (write(dependfile, " ", 1) 425 < 0) 426 goto wrerror; 427 if (prefix != NULL) 428 if (write(dependfile, prefix, 429 strlen(prefix)) < 0) 430 goto wrerror; 431 if (write(dependfile, line, 432 suf - line) < 0) 433 goto wrerror; 434 if (write(dependfile, sl->suff, 435 sl->len) < 0) 436 goto wrerror; 437 } 438 if (write(dependfile, colon, eol - colon) < 0) 439 goto wrerror; 440 } else { 441 if (prefix != NULL) 442 if (write(dependfile, prefix, 443 strlen(prefix)) < 0) 444 goto wrerror; 445 if (write(dependfile, line, eol - line) < 0) 446 goto wrerror; 447 } 448 449 if (oflag) 450 save_for_optional(colon + 1, eol); 451 line = eol; 452 } 453 munmap(buf, sz); 454 } 455 456 if (oflag && opt != NULL) { 457 if (write(dependfile, ".OPTIONAL:", 10) < 0) 458 goto wrerror; 459 width = 9; 460 sz = write_optional(dependfile, opt, 0); 461 if (sz == (size_t)-1) 462 goto wrerror; 463 /* 'depth' is about 39 for an i386 kernel */ 464 /* fprintf(stderr, "Recursion depth %d\n", sz); */ 465 } 466 close(dependfile); 467 468 exit(EXIT_SUCCESS); 469 wrerror: 470 err(EXIT_FAILURE, "unable to %s to file %s", 471 aflag & O_TRUNC ? "write" : "append", filename); 472 } 473 474 475 /* 476 * Only save each file once - the kernel .depend is 3MB and there is 477 * no point doubling its size. 478 * The data seems to be 'random enough' so the simple binary tree 479 * only has a reasonable depth. 480 */ 481 static void 482 save_for_optional(const char *start, const char *limit) 483 { 484 opt_t **l, *n; 485 const char *name, *end; 486 int c; 487 488 while (start < limit && strchr(" \t\n\\", *start)) 489 start++; 490 for (name = start; ; name = end) { 491 while (name < limit && strchr(" \t\n\\", *name)) 492 name++; 493 for (end = name; end < limit && !strchr(" \t\n\\", *end);) 494 end++; 495 if (name >= limit) 496 break; 497 if (end[-1] == 'c' && end[-2] == '.' && name == start) 498 /* ignore dependency on the files own .c */ 499 continue; 500 for (l = &opt;;) { 501 n = *l; 502 if (n == NULL) { 503 n = malloc(sizeof *n + (end - name)); 504 n->left = n->right = 0; 505 n->len = end - name; 506 n->count = 1; 507 n->name[0] = ' '; 508 memcpy(n->name + 1, name, end - name); 509 *l = n; 510 break; 511 } 512 c = (end - name) - n->len; 513 if (c == 0) 514 c = memcmp(n->name + 1, name, (end - name)); 515 if (c == 0) { 516 /* Duplicate */ 517 n->count++; 518 break; 519 } 520 if (c < 0) 521 l = &n->left; 522 else 523 l = &n->right; 524 } 525 } 526 } 527 528 static size_t 529 write_optional(int fd, opt_t *node, size_t depth) 530 { 531 size_t d1 = ++depth; 532 533 if (node->left) 534 d1 = write_optional(fd, node->left, d1); 535 if (width > 76 - node->len) { 536 if (write(fd, " \\\n ", 4) < 0) 537 return (size_t)-1; 538 width = 1; 539 } 540 width += 1 + node->len; 541 if (write(fd, node->name, 1 + node->len) < 0) 542 return (size_t)-1; 543 if (node->right) 544 depth = write_optional(fd, node->right, depth); 545 return d1 > depth ? d1 : depth; 546 } 547
Indexes created Sat Sep 20 22:09:52 GMT 2025