1 /* Dependency generator for Makefile fragments.
2 Copyright (C) 2000, 2001, 2003 Free Software Foundation, Inc.
3 Contributed by Zack Weinberg, Mar 2000
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 2, or (at your option) any
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 In other words, you are welcome to use, share and improve this program.
20 You are forbidden to forbid anyone else to use, share and improve
21 what you give them. Help stamp out software-hoarding! */
29 /* Keep this structure local to this file, so clients don't find it
30 easy to start making assumptions. */
34 unsigned int ntargets; /* number of slots actually occupied */
35 unsigned int targets_size; /* amt of allocated space - in words */
39 unsigned int deps_size;
42 static const char *munge (const char *);
44 /* Given a filename, quote characters in that filename which are
45 significant to Make. Note that it's not possible to quote all such
46 characters - e.g. \n, %, *, ?, [, \ (in some contexts), and ~ are
47 not properly handled. It isn't possible to get this right in any
48 current version of Make. (??? Still true? Old comment referred to
52 munge (const char *filename)
58 for (p = filename, len = 0; *p; p++, len++)
64 /* GNU make uses a weird quoting scheme for white space.
65 A space or tab preceded by 2N+1 backslashes represents
66 N backslashes followed by space; a space or tab
67 preceded by 2N backslashes represents N backslashes at
68 the end of a file name; and backslashes in other
69 contexts should not be doubled. */
70 for (q = p - 1; filename <= q && *q == '\\'; q--)
76 /* '$' is quoted by doubling it. */
82 /* Now we know how big to make the buffer. */
83 buffer = xmalloc (len + 1);
85 for (p = filename, dst = buffer; *p; p++, dst++)
91 for (q = p - 1; filename <= q && *q == '\\'; q--)
110 /* Public routines. */
115 struct deps *d = xmalloc (sizeof (struct deps));
117 /* Allocate space for the vectors only if we need it. */
131 deps_free (struct deps *d)
137 for (i = 0; i < d->ntargets; i++)
138 free ((void *) d->targetv[i]);
144 for (i = 0; i < d->ndeps; i++)
145 free ((void *) d->depv[i]);
152 /* Adds a target T. We make a copy, so it need not be a permanent
153 string. QUOTE is true if the string should be quoted. */
155 deps_add_target (struct deps *d, const char *t, int quote)
157 if (d->ntargets == d->targets_size)
159 d->targets_size = d->targets_size * 2 + 4;
160 d->targetv = xrealloc (d->targetv,
161 d->targets_size * sizeof (const char *));
165 t = munge (t); /* Also makes permanent copy. */
169 d->targetv[d->ntargets++] = t;
172 /* Sets the default target if none has been given already. An empty
173 string as the default target in interpreted as stdin. The string
174 is quoted for MAKE. */
176 deps_add_default_target (cpp_reader *pfile, const char *tgt)
178 struct deps *d = pfile->deps;
180 /* Only if we have no targets. */
185 deps_add_target (d, "-", 1);
188 #ifndef TARGET_OBJECT_SUFFIX
189 # define TARGET_OBJECT_SUFFIX ".o"
191 const char *start = lbasename (tgt);
196 if (NULL == CPP_OPTION (pfile, obj_ext))
197 obj_ext = TARGET_OBJECT_SUFFIX;
198 else if (CPP_OPTION (pfile, obj_ext)[0] != '.')
200 char *t = alloca (strlen (CPP_OPTION (pfile, obj_ext)) + 2);
202 strcpy (&t[1], CPP_OPTION (pfile, obj_ext));
206 obj_ext = CPP_OPTION (pfile, obj_ext);
208 o = (char *) alloca (strlen (start) + strlen (obj_ext) + 1);
212 suffix = strrchr (o, '.');
214 suffix = o + strlen (o);
215 strcpy (suffix, obj_ext);
217 deps_add_target (d, o, 1);
222 deps_add_dep (struct deps *d, const char *t)
224 t = munge (t); /* Also makes permanent copy. */
226 if (d->ndeps == d->deps_size)
228 d->deps_size = d->deps_size * 2 + 8;
229 d->depv = xrealloc (d->depv, d->deps_size * sizeof (const char *));
231 d->depv[d->ndeps++] = t;
235 deps_write (const struct deps *d, FILE *fp, unsigned int colmax)
237 unsigned int size, i, column;
240 if (colmax && colmax < 34)
243 for (i = 0; i < d->ntargets; i++)
245 size = strlen (d->targetv[i]);
247 if (colmax && column > colmax)
249 fputs (" \\\n ", fp);
257 fputs (d->targetv[i], fp);
264 for (i = 0; i < d->ndeps; i++)
266 size = strlen (d->depv[i]);
268 if (colmax && column > colmax)
270 fputs (" \\\n ", fp);
278 fputs (d->depv[i], fp);
284 deps_phony_targets (const struct deps *d, FILE *fp)
288 for (i = 1; i < d->ndeps; i++)
291 fputs (d->depv[i], fp);
297 /* Write out a deps buffer to a file, in a form that can be read back
298 with deps_restore. Returns nonzero on error, in which case the
299 error number will be in errno. */
302 deps_save (struct deps *deps, FILE *f)
306 /* The cppreader structure contains makefile dependences. Write out this
309 /* The number of dependences. */
310 if (fwrite (&deps->ndeps, sizeof (deps->ndeps), 1, f) != 1)
312 /* The length of each dependence followed by the string. */
313 for (i = 0; i < deps->ndeps; i++)
315 size_t num_to_write = strlen (deps->depv[i]);
316 if (fwrite (&num_to_write, sizeof (size_t), 1, f) != 1)
318 if (fwrite (deps->depv[i], num_to_write, 1, f) != 1)
325 /* Read back dependency information written with deps_save into
326 the deps buffer. The third argument may be NULL, in which case
327 the dependency information is just skipped, or it may be a filename,
328 in which case that filename is skipped. */
331 deps_restore (struct deps *deps, FILE *fd, const char *self)
333 unsigned int i, count;
335 size_t buf_size = 512;
336 char *buf = xmalloc (buf_size);
338 /* Number of dependences. */
339 if (fread (&count, 1, sizeof (count), fd) != sizeof (count))
342 /* The length of each dependence string, followed by the string. */
343 for (i = 0; i < count; i++)
345 /* Read in # bytes in string. */
346 if (fread (&num_to_read, 1, sizeof (size_t), fd) != sizeof (size_t))
348 if (buf_size < num_to_read + 1)
350 buf_size = num_to_read + 1 + 127;
351 buf = xrealloc (buf, buf_size);
353 if (fread (buf, 1, num_to_read, fd) != num_to_read)
355 buf[num_to_read] = '\0';
357 /* Generate makefile dependencies from .pch if -nopch-deps. */
358 if (self != NULL && strcmp (buf, self) != 0)
359 deps_add_dep (deps, buf);