438 lines
9.8 KiB
C
438 lines
9.8 KiB
C
/* Dependency generator for Makefile fragments.
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Copyright (C) 2000-2013 Free Software Foundation, Inc.
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Contributed by Zack Weinberg, Mar 2000
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>.
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In other words, you are welcome to use, share and improve this program.
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You are forbidden to forbid anyone else to use, share and improve
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what you give them. Help stamp out software-hoarding! */
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#include "config.h"
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#include "system.h"
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#include "mkdeps.h"
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/* Keep this structure local to this file, so clients don't find it
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easy to start making assumptions. */
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struct deps
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{
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const char **targetv;
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unsigned int ntargets; /* number of slots actually occupied */
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unsigned int targets_size; /* amt of allocated space - in words */
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const char **depv;
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unsigned int ndeps;
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unsigned int deps_size;
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const char **vpathv;
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size_t *vpathlv;
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unsigned int nvpaths;
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unsigned int vpaths_size;
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};
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static const char *munge (const char *);
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/* Given a filename, quote characters in that filename which are
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significant to Make. Note that it's not possible to quote all such
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characters - e.g. \n, %, *, ?, [, \ (in some contexts), and ~ are
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not properly handled. It isn't possible to get this right in any
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current version of Make. (??? Still true? Old comment referred to
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3.76.1.) */
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static const char *
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munge (const char *filename)
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{
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int len;
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const char *p, *q;
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char *dst, *buffer;
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for (p = filename, len = 0; *p; p++, len++)
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{
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switch (*p)
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{
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case ' ':
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case '\t':
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/* GNU make uses a weird quoting scheme for white space.
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A space or tab preceded by 2N+1 backslashes represents
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N backslashes followed by space; a space or tab
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preceded by 2N backslashes represents N backslashes at
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the end of a file name; and backslashes in other
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contexts should not be doubled. */
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for (q = p - 1; filename <= q && *q == '\\'; q--)
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len++;
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len++;
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break;
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case '$':
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/* '$' is quoted by doubling it. */
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len++;
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break;
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case '#':
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/* '#' is quoted with a backslash. */
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len++;
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break;
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}
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}
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/* Now we know how big to make the buffer. */
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buffer = XNEWVEC (char, len + 1);
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for (p = filename, dst = buffer; *p; p++, dst++)
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{
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switch (*p)
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{
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case ' ':
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case '\t':
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for (q = p - 1; filename <= q && *q == '\\'; q--)
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*dst++ = '\\';
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*dst++ = '\\';
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break;
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case '$':
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*dst++ = '$';
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break;
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case '#':
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*dst++ = '\\';
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break;
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default:
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/* nothing */;
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}
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*dst = *p;
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}
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*dst = '\0';
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return buffer;
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}
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/* If T begins with any of the partial pathnames listed in d->vpathv,
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then advance T to point beyond that pathname. */
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static const char *
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apply_vpath (struct deps *d, const char *t)
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{
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if (d->vpathv)
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{
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unsigned int i;
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for (i = 0; i < d->nvpaths; i++)
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{
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if (!filename_ncmp (d->vpathv[i], t, d->vpathlv[i]))
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{
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const char *p = t + d->vpathlv[i];
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if (!IS_DIR_SEPARATOR (*p))
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goto not_this_one;
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/* Do not simplify $(vpath)/../whatever. ??? Might not
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be necessary. */
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if (p[1] == '.' && p[2] == '.' && IS_DIR_SEPARATOR (p[3]))
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goto not_this_one;
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/* found a match */
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t = t + d->vpathlv[i] + 1;
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break;
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}
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not_this_one:;
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}
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}
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/* Remove leading ./ in any case. */
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while (t[0] == '.' && IS_DIR_SEPARATOR (t[1]))
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{
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t += 2;
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/* If we removed a leading ./, then also remove any /s after the
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first. */
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while (IS_DIR_SEPARATOR (t[0]))
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++t;
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}
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return t;
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}
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/* Public routines. */
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struct deps *
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deps_init (void)
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{
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return XCNEW (struct deps);
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}
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void
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deps_free (struct deps *d)
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{
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unsigned int i;
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if (d->targetv)
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{
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for (i = 0; i < d->ntargets; i++)
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free ((void *) d->targetv[i]);
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free (d->targetv);
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}
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if (d->depv)
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{
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for (i = 0; i < d->ndeps; i++)
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free ((void *) d->depv[i]);
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free (d->depv);
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}
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if (d->vpathv)
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{
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for (i = 0; i < d->nvpaths; i++)
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free ((void *) d->vpathv[i]);
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free (d->vpathv);
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free (d->vpathlv);
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}
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free (d);
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}
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/* Adds a target T. We make a copy, so it need not be a permanent
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string. QUOTE is true if the string should be quoted. */
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void
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deps_add_target (struct deps *d, const char *t, int quote)
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{
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if (d->ntargets == d->targets_size)
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{
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d->targets_size = d->targets_size * 2 + 4;
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d->targetv = XRESIZEVEC (const char *, d->targetv, d->targets_size);
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}
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t = apply_vpath (d, t);
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if (quote)
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t = munge (t); /* Also makes permanent copy. */
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else
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t = xstrdup (t);
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d->targetv[d->ntargets++] = t;
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}
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/* Sets the default target if none has been given already. An empty
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string as the default target in interpreted as stdin. The string
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is quoted for MAKE. */
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void
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deps_add_default_target (struct deps *d, const char *tgt)
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{
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/* Only if we have no targets. */
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if (d->ntargets)
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return;
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if (tgt[0] == '\0')
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deps_add_target (d, "-", 1);
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else
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{
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#ifndef TARGET_OBJECT_SUFFIX
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# define TARGET_OBJECT_SUFFIX ".o"
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#endif
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const char *start = lbasename (tgt);
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char *o = (char *) alloca (strlen (start)
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+ strlen (TARGET_OBJECT_SUFFIX) + 1);
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char *suffix;
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strcpy (o, start);
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suffix = strrchr (o, '.');
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if (!suffix)
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suffix = o + strlen (o);
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strcpy (suffix, TARGET_OBJECT_SUFFIX);
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deps_add_target (d, o, 1);
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}
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}
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void
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deps_add_dep (struct deps *d, const char *t)
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{
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t = munge (apply_vpath (d, t)); /* Also makes permanent copy. */
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if (d->ndeps == d->deps_size)
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{
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d->deps_size = d->deps_size * 2 + 8;
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d->depv = XRESIZEVEC (const char *, d->depv, d->deps_size);
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}
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d->depv[d->ndeps++] = t;
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}
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void
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deps_add_vpath (struct deps *d, const char *vpath)
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{
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const char *elem, *p;
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char *copy;
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size_t len;
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for (elem = vpath; *elem; elem = p)
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{
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for (p = elem; *p && *p != ':'; p++);
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len = p - elem;
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copy = XNEWVEC (char, len + 1);
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memcpy (copy, elem, len);
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copy[len] = '\0';
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if (*p == ':')
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p++;
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if (d->nvpaths == d->vpaths_size)
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{
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d->vpaths_size = d->vpaths_size * 2 + 8;
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d->vpathv = XRESIZEVEC (const char *, d->vpathv, d->vpaths_size);
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d->vpathlv = XRESIZEVEC (size_t, d->vpathlv, d->vpaths_size);
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}
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d->vpathv[d->nvpaths] = copy;
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d->vpathlv[d->nvpaths] = len;
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d->nvpaths++;
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}
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}
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void
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deps_write (const struct deps *d, FILE *fp, unsigned int colmax)
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{
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unsigned int size, i, column;
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column = 0;
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if (colmax && colmax < 34)
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colmax = 34;
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for (i = 0; i < d->ntargets; i++)
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{
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size = strlen (d->targetv[i]);
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column += size;
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if (i)
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{
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if (colmax && column > colmax)
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{
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fputs (" \\\n ", fp);
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column = 1 + size;
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}
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else
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{
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putc (' ', fp);
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column++;
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}
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}
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fputs (d->targetv[i], fp);
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}
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putc (':', fp);
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column++;
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for (i = 0; i < d->ndeps; i++)
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{
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size = strlen (d->depv[i]);
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column += size;
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if (colmax && column > colmax)
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{
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fputs (" \\\n ", fp);
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column = 1 + size;
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}
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else
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{
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putc (' ', fp);
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column++;
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}
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fputs (d->depv[i], fp);
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}
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putc ('\n', fp);
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}
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void
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deps_phony_targets (const struct deps *d, FILE *fp)
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{
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unsigned int i;
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for (i = 1; i < d->ndeps; i++)
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{
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putc ('\n', fp);
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fputs (d->depv[i], fp);
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putc (':', fp);
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putc ('\n', fp);
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}
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}
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/* Write out a deps buffer to a file, in a form that can be read back
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with deps_restore. Returns nonzero on error, in which case the
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error number will be in errno. */
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int
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deps_save (struct deps *deps, FILE *f)
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{
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unsigned int i;
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/* The cppreader structure contains makefile dependences. Write out this
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structure. */
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/* The number of dependences. */
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if (fwrite (&deps->ndeps, sizeof (deps->ndeps), 1, f) != 1)
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return -1;
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/* The length of each dependence followed by the string. */
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for (i = 0; i < deps->ndeps; i++)
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{
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size_t num_to_write = strlen (deps->depv[i]);
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if (fwrite (&num_to_write, sizeof (size_t), 1, f) != 1)
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return -1;
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if (fwrite (deps->depv[i], num_to_write, 1, f) != 1)
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return -1;
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}
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return 0;
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}
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/* Read back dependency information written with deps_save into
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the deps buffer. The third argument may be NULL, in which case
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the dependency information is just skipped, or it may be a filename,
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in which case that filename is skipped. */
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int
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deps_restore (struct deps *deps, FILE *fd, const char *self)
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{
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unsigned int i, count;
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size_t num_to_read;
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size_t buf_size = 512;
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char *buf;
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/* Number of dependences. */
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if (fread (&count, 1, sizeof (count), fd) != sizeof (count))
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return -1;
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buf = XNEWVEC (char, buf_size);
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/* The length of each dependence string, followed by the string. */
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for (i = 0; i < count; i++)
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{
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/* Read in # bytes in string. */
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if (fread (&num_to_read, 1, sizeof (size_t), fd) != sizeof (size_t))
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{
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free (buf);
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return -1;
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}
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if (buf_size < num_to_read + 1)
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{
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buf_size = num_to_read + 1 + 127;
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buf = XRESIZEVEC (char, buf, buf_size);
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}
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if (fread (buf, 1, num_to_read, fd) != num_to_read)
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{
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free (buf);
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return -1;
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}
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buf[num_to_read] = '\0';
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/* Generate makefile dependencies from .pch if -nopch-deps. */
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if (self != NULL && filename_cmp (buf, self) != 0)
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deps_add_dep (deps, buf);
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}
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free (buf);
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return 0;
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}
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