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When there are device name aliases, choose the "nicest" to display.

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This commit is contained in:
Alasdair Kergon 2003-01-03 21:11:23 +00:00
parent 4e268ceacb
commit 4aae68792c
1 changed files with 73 additions and 1 deletions
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72
lib/device/dev-cache.c
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@ -65,9 +65,72 @@ static struct device *_create_dev(dev_t d)
return dev;
}
/* Return 1 if we prefer path1 else return 0 */
static int _compare_paths(const char *path0, const char *path1)
{
int slash0 = 0, slash1 = 0;
const char *p;
char p0[PATH_MAX], p1[PATH_MAX];
char *s0, *s1;
struct stat stat0, stat1;
/* Return the path with fewer slashes */
for (p = path0; p++; p = (const char *) strchr(p, '/'))
slash0++;
for (p = path1; p++; p = (const char *) strchr(p, '/'))
slash1++;
if (slash0 < slash1)
return 0;
if (slash1 < slash0)
return 1;
strncpy(p0, path0, PATH_MAX);
strncpy(p1, path1, PATH_MAX);
s0 = &p0[0] + 1;
s1 = &p1[0] + 1;
/* We prefer symlinks - they exist for a reason!
* So we prefer a shorter path before the first symlink in the name.
* FIXME Configuration option to invert this? */
while (s0) {
s0 = strchr(s0, '/');
s1 = strchr(s1, '/');
if (s0) {
*s0 = '\0';
*s1 = '\0';
}
if (lstat(p0, &stat0)) {
log_sys_error("lstat", p0);
return 1;
}
if (lstat(p1, &stat1)) {
log_sys_error("lstat", p1);
return 0;
}
if (S_ISLNK(stat0.st_mode) && !S_ISLNK(stat1.st_mode))
return 0;
if (!S_ISLNK(stat0.st_mode) && S_ISLNK(stat1.st_mode))
return 1;
if (s0) {
*s0++ = '/';
*s1++ = '/';
}
}
/* ASCII comparison */
if (strcmp(path0, path1) < 0)
return 0;
else
return 1;
}
static int _add_alias(struct device *dev, const char *path)
{
struct str_list *sl = _alloc(sizeof(*sl));
const char *oldpath;
int prefer_old = 1;
if (!sl) {
stack;
@ -79,7 +142,16 @@ static int _add_alias(struct device *dev, const char *path)
return 0;
}
if (!list_empty(&dev->aliases)) {
oldpath = list_item(dev->aliases.n, struct str_list)->str;
prefer_old = _compare_paths(path, oldpath);
}
if (prefer_old)
list_add(&dev->aliases, &sl->list);
else
list_add_h(&dev->aliases, &sl->list);
return 1;
}