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Formerly vpath.c.~9~

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This commit is contained in:
Roland McGrath 1993-02-08 22:50:00 +00:00
parent cc1433e808
commit bede66b709
1 changed files with 38 additions and 14 deletions
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52
vpath.c
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@ -246,13 +246,15 @@ construct_vpath_list (pattern, dirpath)
}
/* Search the VPATH list whose pattern matches *FILE for a directory
where the name pointed to by FILE exists. If it is found, the pointer
in FILE is set to the newly malloc'd name of the existing file and
we return 1. Otherwise we return 0. */
where the name pointed to by FILE exists. If it is found, we set *FILE to
the newly malloc'd name of the existing file, *MTIME_PTR (if MTIME_PTR is
not NULL) to its modtime (or zero if no stat call was done), and return 1.
Otherwise we return 0. */
int
vpath_search (file)
vpath_search (file, mtime_ptr)
char **file;
time_t *mtime_ptr;
{
register struct vpath *v;
@ -264,11 +266,11 @@ vpath_search (file)
for (v = vpaths; v != 0; v = v->next)
if (pattern_matches (v->pattern, v->percent, *file))
if (selective_vpath_search (v, file))
if (selective_vpath_search (v, file, mtime_ptr))
return 1;
if (general_vpath != 0
&& selective_vpath_search (general_vpath, file))
&& selective_vpath_search (general_vpath, file, mtime_ptr))
return 1;
return 0;
@ -276,14 +278,16 @@ vpath_search (file)
/* Search the given VPATH list for a directory where the name pointed
to by FILE exists. If it is found, the pointer in FILE
is set to the newly malloc'd name of the existing file and we return 1.
to by FILE exists. If it is found, we set *FILE to the newly malloc'd
name of the existing file, *MTIME_PTR (if MTIME_PTR is not NULL) to
its modtime (or zero if no stat call was done), and we return 1.
Otherwise we return 0. */
static int
selective_vpath_search (path, file)
selective_vpath_search (path, file, mtime_ptr)
struct vpath *path;
char **file;
time_t *mtime_ptr;
{
int not_target;
char *name, *n;
@ -323,6 +327,8 @@ selective_vpath_search (path, file)
/* Try each VPATH entry. */
for (i = 0; vpath[i] != 0; ++i)
{
int exists_in_cache = 0;
n = name;
/* Put the next VPATH entry into NAME at N and increment N past it. */
@ -360,20 +366,38 @@ selective_vpath_search (path, file)
/* We know the directory is in the hash table now because either
construct_vpath_list or the code just above put it there.
Does the file we seek exist in it? */
exists = dir_file_exists_p (name, filename);
exists_in_cache = exists = dir_file_exists_p (name, filename);
}
if (exists)
{
/* We have found a file.
Store the name we found into *FILE for the caller. */
/* The file is in the directory cache.
Now check that it actually exists in the filesystem.
The cache may be out of date. When vpath thinks a file
exists, but stat fails for it, confusion results in the
higher levels. */
struct stat st;
/* Put the slash back in NAME. */
*n = '/';
*file = savestring (name, (n + 1 - name) + flen);
if (!exists_in_cache /* Makefile-mentioned file need not exist. */
|| stat (name, &st) == 0) /* Does it really exist? */
{
/* We have found a file.
Store the name we found into *FILE for the caller. */
return 1;
*file = savestring (name, (n + 1 - name) + flen);
if (mtime_ptr != 0)
/* Store the modtime into *MTIME_PTR for the caller.
If we have had no need to stat the file here,
we record a zero modtime to indicate this. */
*mtime_ptr = exists_in_cache ? st.st_mtime : (time_t) 0;
return 1;
}
}
}