Home | History | Annotate | Line # | Download | only in mkdep
mkdep.c revision 1.32 
      1 /* $NetBSD: mkdep.c,v 1.32 2008/07/21 14:19:24 lukem 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 1.32 2008/07/21 14:19:24 lukem 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 <locale.h>
     50 #include <paths.h>
     51 #include <stdio.h>
     52 #include <stdlib.h>
     53 #include <string.h>
     54 #include <unistd.h>
     55 
     56 #include "findcc.h"
     57 
     58 typedef struct opt opt_t;
     59 struct opt {
     60 	opt_t	*left;
     61 	opt_t	*right;
     62 	int	len;
     63 	int	count;
     64 	char	name[4];
     65 };
     66 
     67 typedef struct {
     68 	int	len;
     69 	char	suff[12];
     70 } suff_list_t;
     71 
     72 /* tree of includes for -o processing */
     73 opt_t *opt;
     74 int width;
     75 
     76 #define DEFAULT_PATH		_PATH_DEFPATH
     77 #define DEFAULT_FILENAME	".depend"
     78 
     79 static void save_for_optional(const char *, const char *);
     80 static int write_optional(int, opt_t *, int);
     81 
     82 
     83 static inline void *
     84 deconst(const void *p)
     85 {
     86 	return (const char *)p - (const char *)0 + (char *)0;
     87 }
     88 
     89 static void
     90 usage(void)
     91 {
     92 	(void)fprintf(stderr,
     93 	    "usage: %s [-aDdopq] [-f file] [-s suffixes] -- [flags] file ...\n",
     94 	    getprogname());
     95 	exit(EXIT_FAILURE);
     96 }
     97 
     98 static int
     99 run_cc(int argc, char **argv, const char **fname)
    100 {
    101 	const char *CC, *tmpdir;
    102 	char * volatile pathname;
    103 	static char tmpfilename[MAXPATHLEN];
    104 	char **args;
    105 	int tmpfd;
    106 	pid_t pid, cpid;
    107 	int status;
    108 
    109 	if ((CC = getenv("CC")) == NULL)
    110 		CC = DEFAULT_CC;
    111 	if ((pathname = findcc(CC)) == NULL)
    112 		if (!setenv("PATH", DEFAULT_PATH, 1))
    113 			pathname = findcc(CC);
    114 	if (pathname == NULL)
    115 		err(EXIT_FAILURE, "%s: not found", CC);
    116 	if ((args = malloc((argc + 3) * sizeof(char *))) == NULL)
    117 		err(EXIT_FAILURE, "malloc");
    118 
    119 	args[0] = deconst(CC);
    120 	args[1] = deconst("-M");
    121 	(void)memcpy(&args[2], argv, (argc + 1) * sizeof(char *));
    122 
    123 	if ((tmpdir = getenv("TMPDIR")) == NULL)
    124 		tmpdir = _PATH_TMP;
    125 	(void)snprintf(tmpfilename, sizeof (tmpfilename), "%s/%s", tmpdir,
    126 	    "mkdepXXXXXX");
    127 	if ((tmpfd = mkstemp(tmpfilename)) < 0) {
    128 		warn("unable to create temporary file %s", tmpfilename);
    129 		exit(EXIT_FAILURE);
    130 	}
    131 	(void)unlink(tmpfilename);
    132 	*fname = tmpfilename;
    133 
    134 	switch (cpid = vfork()) {
    135 	case 0:
    136 		(void)dup2(tmpfd, STDOUT_FILENO);
    137 		(void)close(tmpfd);
    138 
    139 		(void)execv(pathname, args);
    140 		_exit(EXIT_FAILURE);
    141 		/* NOTREACHED */
    142 
    143 	case -1:
    144 		err(EXIT_FAILURE, "unable to fork");
    145 	}
    146 
    147 	free(pathname);
    148 	free(args);
    149 
    150 	while (((pid = wait(&status)) != cpid) && (pid >= 0))
    151 		continue;
    152 
    153 	if (status)
    154 		errx(EXIT_FAILURE, "compile failed.");
    155 
    156 	return tmpfd;
    157 }
    158 
    159 static const char *
    160 read_fname(void)
    161 {
    162 	static char *fbuf;
    163 	static int fbuflen;
    164 	int len, ch;
    165 
    166 	for (len = 0; (ch = getchar()) != EOF; len++) {
    167 		if (isspace(ch)) {
    168 			if (len != 0)
    169 				break;
    170 			len--;
    171 			continue;
    172 		}
    173 		if (len >= fbuflen - 1) {
    174 			fbuf = realloc(fbuf, fbuflen += 32);
    175 			if (fbuf == NULL)
    176 				err(EXIT_FAILURE, "no memory");
    177 		}
    178 		fbuf[len] = ch;
    179 	}
    180 	if (len == 0)
    181 		return NULL;
    182 	fbuf[len] = 0;
    183 	return fbuf;
    184 }
    185 
    186 int
    187 main(int argc, char **argv)
    188 {
    189 	int 	aflag, dflag, oflag, qflag;
    190 	const char *filename;
    191 	int	dependfile;
    192 	char	*buf, *lim, *ptr, *line, *suf, *colon, *eol;
    193 	int	ok_ind, ch;
    194 	int	sz;
    195 	int	fd;
    196 	const char *fname;
    197 	const char *suffixes = NULL, *s;
    198 	suff_list_t *suff_list = NULL, *sl;
    199 
    200 	suf = NULL;		/* XXXGCC -Wuninitialized [sun2] */
    201 	sl = NULL;		/* XXXGCC -Wuninitialized [sun2] */
    202 
    203 	setlocale(LC_ALL, "");
    204 	setprogname(argv[0]);
    205 
    206 	aflag = O_WRONLY | O_APPEND | O_CREAT | O_TRUNC;
    207 	dflag = 0;
    208 	oflag = 0;
    209 	qflag = 0;
    210 	filename = DEFAULT_FILENAME;
    211 	dependfile = -1;
    212 
    213 	opterr = 0;	/* stop getopt() bleating about errors. */
    214 	for (;;) {
    215 		ok_ind = optind;
    216 		ch = getopt(argc, argv, "aDdf:opqs:");
    217 		switch (ch) {
    218 		case -1:
    219 			ok_ind = optind;
    220 			break;
    221 		case 'a':	/* Append to output file */
    222 			aflag &= ~O_TRUNC;
    223 			continue;
    224 		case 'D':	/* Process *.d files (don't run cc -M) */
    225 			dflag = 2;	/* Read names from stdin */
    226 			opterr = 1;
    227 			continue;
    228 		case 'd':	/* Process *.d files (don't run cc -M) */
    229 			dflag = 1;
    230 			opterr = 1;
    231 			continue;
    232 		case 'f':	/* Name of output file */
    233 			filename = optarg;
    234 			continue;
    235 		case 'o':	/* Mark dependant files .OPTIONAL */
    236 			oflag = 1;
    237 			continue;
    238 		case 'p':	/* Program mode (x.o: -> x:) */
    239 			suffixes = "";
    240 			continue;
    241 		case 'q':	/* Quiet */
    242 			qflag = 1;
    243 			continue;
    244 		case 's':	/* Suffix list */
    245 			suffixes = optarg;
    246 			continue;
    247 		default:
    248 			if (dflag)
    249 				usage();
    250 			/* Unknown arguments are passed to "${CC} -M" */
    251 			break;
    252 		}
    253 		break;
    254 	}
    255 
    256 	argc -= ok_ind;
    257 	argv += ok_ind;
    258 	if ((argc == 0 && !dflag) || (argc != 0 && dflag == 2))
    259 		usage();
    260 
    261 	if (suffixes != NULL) {
    262 		/* parse list once and save names and lengths */
    263 		/* allocate an extra entry to mark end of list */
    264 		for (sz = 1, s = suffixes; *s != 0; s++)
    265 			if (*s == '.')
    266 			    sz++;
    267 		suff_list = calloc(sz, sizeof *suff_list);
    268 		if (suff_list == NULL)
    269 			err(2, "malloc");
    270 		sl = suff_list;
    271 		for (s = suffixes; (s = strchr(s, '.')); s += sz, sl++ ) {
    272 			sz = strcspn(s, ", ");
    273 			if (sz > sizeof sl->suff)
    274 				errx(2, "suffix too long");
    275 			sl->len = sz;
    276 			memcpy(sl->suff, s, sz);
    277 		}
    278 	}
    279 
    280 	dependfile = open(filename, aflag, 0666);
    281 	if (dependfile == -1)
    282 		err(EXIT_FAILURE, "unable to %s to file %s\n",
    283 		    aflag & O_TRUNC ? "write" : "append", filename);
    284 
    285 	while (dflag == 2 || *argv != NULL) {
    286 		if (dflag) {
    287 			if (dflag == 2) {
    288 				fname = read_fname();
    289 				if (fname == NULL)
    290 					break;
    291 			} else
    292 				fname = *argv++;
    293 			fd = open(fname, O_RDONLY, 0);
    294 			if (fd == -1) {
    295 				if (!qflag)
    296 					warn("ignoring %s", fname);
    297 				continue;
    298 			}
    299 		} else {
    300 			fd = run_cc(argc, argv, &fname);
    301 			/* consume all args... */
    302 			argv += argc;
    303 		}
    304 
    305 		sz = lseek(fd, 0, SEEK_END);
    306 		if (sz == 0) {
    307 			close(fd);
    308 			continue;
    309 		}
    310 		buf = mmap(NULL, sz, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
    311 		close(fd);
    312 
    313 		if (buf == MAP_FAILED)
    314 			err(EXIT_FAILURE, "unable to mmap file %s", fname);
    315 		lim = buf + sz - 1;
    316 
    317 		/* Remove leading "./" from filenames */
    318 		for (ptr = buf; ptr < lim; ptr++) {
    319 			if (ptr[1] != '.' || ptr[2] != '/'
    320 			    || !isspace((unsigned char)ptr[0]))
    321 				continue;
    322 			ptr[1] = ' ';
    323 			ptr[2] = ' ';
    324 		}
    325 
    326 		for (line = eol = buf; eol <= lim;) {
    327 			while (eol <= lim && *eol++ != '\n')
    328 				/* Find end of this line */
    329 				continue;
    330 			if (line == eol - 1) {
    331 				/* empty line - ignore */
    332 				line = eol;
    333 				continue;
    334 			}
    335 			if (eol[-2] == '\\')
    336 				/* Assemble continuation lines */
    337 				continue;
    338 			for (colon = line; *colon != ':'; colon++) {
    339 				if (colon >= eol) {
    340 					colon = NULL;
    341 					break;
    342 				}
    343 			}
    344 			if (isspace((unsigned char)*line) || colon == NULL) {
    345 				/* No dependency - just transcribe line */
    346 				write(dependfile, line, eol - line);
    347 				line = eol;
    348 				continue;
    349 			}
    350 			if (suff_list != NULL) {
    351 				/* Find the .o: */
    352 				/* First allow for any whitespace */
    353 				for (suf = colon; suf > buf; suf--) {
    354 					if (!isspace((unsigned char)suf[-1]))
    355 						break;
    356 				}
    357 				if (suf == buf)
    358 					errx(EXIT_FAILURE,
    359 					    "Corrupted file `%s'", fname);
    360 				/* Then look for any valid suffix */
    361 				for (sl = suff_list; sl->len != 0; sl++) {
    362 					if (!memcmp(suf - sl->len, sl->suff,
    363 						    sl->len))
    364 						break;
    365 				}
    366 			}
    367 			if (suff_list != NULL && sl->len != 0) {
    368 				suf -= sl->len;
    369 				for (sl = suff_list; sl->len != 0; sl++) {
    370 					if (sl != suff_list)
    371 						write(dependfile, " ", 1);
    372 					write(dependfile, line, suf - line);
    373 					write(dependfile, sl->suff, sl->len);
    374 				}
    375 				write(dependfile, colon, eol - colon);
    376 			} else
    377 				write(dependfile, line, eol - line);
    378 
    379 			if (oflag)
    380 				save_for_optional(colon + 1, eol);
    381 			line = eol;
    382 		}
    383 		munmap(buf, sz);
    384 	}
    385 
    386 	if (oflag && opt != NULL) {
    387 		write(dependfile, ".OPTIONAL:", 10);
    388 		width = 9;
    389 		sz = write_optional(dependfile, opt, 0);
    390 		/* 'depth' is about 39 for an i386 kernel */
    391 		/* fprintf(stderr, "Recursion depth %d\n", sz); */
    392 	}
    393 	close(dependfile);
    394 
    395 	exit(EXIT_SUCCESS);
    396 }
    397 
    398 
    399 /*
    400  * Only save each file once - the kernel .depend is 3MB and there is
    401  * no point doubling its size.
    402  * The data seems to be 'random enough' so the simple binary tree
    403  * only has a reasonable depth.
    404  */
    405 static void
    406 save_for_optional(const char *start, const char *limit)
    407 {
    408 	opt_t **l, *n;
    409 	const char *name, *end;
    410 	int c;
    411 
    412 	while (start < limit && strchr(" \t\n\\", *start))
    413 		start++;
    414 	for (name = start; ; name = end) {
    415 		while (name < limit && strchr(" \t\n\\", *name))
    416 			name++;
    417 		for (end = name; end < limit && !strchr(" \t\n\\", *end);)
    418 			end++;
    419 		if (name >= limit)
    420 			break;
    421 		if (end[-1] == 'c' && end[-2] == '.' && name == start)
    422 			/* ignore dependency on the files own .c */
    423 			continue;
    424 		for (l = &opt;;) {
    425 			n = *l;
    426 			if (n == NULL) {
    427 				n = malloc(sizeof *n + (end - name));
    428 				n->left = n->right = 0;
    429 				n->len = end - name;
    430 				n->count = 1;
    431 				n->name[0] = ' ';
    432 				memcpy(n->name + 1, name, end - name);
    433 				*l = n;
    434 				break;
    435 			}
    436 			c = (end - name) - n->len;
    437 			if (c == 0)
    438 				c = memcmp(n->name + 1, name, (end - name));
    439 			if (c == 0) {
    440 				/* Duplicate */
    441 				n->count++;
    442 				break;
    443 			}
    444 			if (c < 0)
    445 				l = &n->left;
    446 			else
    447 				l = &n->right;
    448 		}
    449 	}
    450 }
    451 
    452 static int
    453 write_optional(int fd, opt_t *node, int depth)
    454 {
    455 	int d1 = ++depth;
    456 
    457 	if (node->left)
    458 		d1 = write_optional(fd, node->left, d1);
    459 	if (width > 76 - node->len) {
    460 		write(fd, " \\\n ", 4);
    461 		width = 1;
    462 	}
    463 	width += 1 + node->len;
    464 	write(fd, node->name, 1 + node->len);
    465 	if (node->right)
    466 		depth = write_optional(fd, node->right, depth);
    467 	return d1 > depth ? d1 : depth;
    468 }
    469