tree-wide: rename hidden_file to hidden_or_backup_file and optimize

In standard linux parlance, "hidden" usually means that the file name starts
with ".", and nothing else. Rename the function to convey what the function does
better to casual readers.

Stop exposing hidden_file_allow_backup which is rather ugly and rewrite
hidden_file to extract the suffix first. Note that hidden_file_allow_backup
excluded files with "~" at the end, which is quite confusing. Let's get
rid of it before it gets used in the wrong place.

7 files changed, 33 insertions, 34 deletions

diff --git a/src/basic/dirent-util.c b/src/basic/dirent-util.c
index 5019882a0a..59067121b7 100644
--- a/src/basic/dirent-util.c
+++ b/src/basic/dirent-util.c
@@ -52,10 +52,10 @@ int dirent_ensure_type(DIR *d, struct dirent *de) {
 bool dirent_is_file(const struct dirent *de) {
         assert(de);
 
-        if (hidden_file(de->d_name))
+        if (!IN_SET(de->d_type, DT_REG, DT_LNK, DT_UNKNOWN))
                 return false;
 
-        if (!IN_SET(de->d_type, DT_REG, DT_LNK, DT_UNKNOWN))
+        if (hidden_or_backup_file(de->d_name))
                 return false;
 
         return true;
diff --git a/src/basic/dirent-util.h b/src/basic/dirent-util.h
index 6bf099b46c..b91d04908f 100644
--- a/src/basic/dirent-util.h
+++ b/src/basic/dirent-util.h
@@ -38,7 +38,7 @@ bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) _pu
                                 on_error;                               \
                         }                                               \
                         break;                                          \
-                } else if (hidden_file((de)->d_name))                   \
+                } else if (hidden_or_backup_file((de)->d_name))         \
                         continue;                                       \
                 else
 
diff --git a/src/basic/fd-util.c b/src/basic/fd-util.c
index 3d46d708c7..9130d023d7 100644
--- a/src/basic/fd-util.c
+++ b/src/basic/fd-util.c
@@ -231,7 +231,7 @@ int close_all_fds(const int except[], unsigned n_except) {
         while ((de = readdir(d))) {
                 int fd = -1;
 
-                if (hidden_file(de->d_name))
+                if (hidden_or_backup_file(de->d_name))
                         continue;
 
                 if (safe_atoi(de->d_name, &fd) < 0)
diff --git a/src/basic/fdset.c b/src/basic/fdset.c
index 06f8ecbdbc..527f27bc67 100644
--- a/src/basic/fdset.c
+++ b/src/basic/fdset.c
@@ -151,7 +151,7 @@ int fdset_new_fill(FDSet **_s) {
         while ((de = readdir(d))) {
                 int fd = -1;
 
-                if (hidden_file(de->d_name))
+                if (hidden_or_backup_file(de->d_name))
                         continue;
 
                 r = safe_atoi(de->d_name, &fd);
diff --git a/src/basic/path-util.c b/src/basic/path-util.c
index 25aa355397..100e3f5af2 100644
--- a/src/basic/path-util.c
+++ b/src/basic/path-util.c
@@ -756,37 +756,37 @@ char *file_in_same_dir(const char *path, const char *filename) {
         return ret;
 }
 
-bool hidden_file_allow_backup(const char *filename) {
-        assert(filename);
-
-        return
-                filename[0] == '.' ||
-                streq(filename, "lost+found") ||
-                streq(filename, "aquota.user") ||
-                streq(filename, "aquota.group") ||
-                endswith(filename, ".rpmnew") ||
-                endswith(filename, ".rpmsave") ||
-                endswith(filename, ".rpmorig") ||
-                endswith(filename, ".dpkg-old") ||
-                endswith(filename, ".dpkg-new") ||
-                endswith(filename, ".dpkg-tmp") ||
-                endswith(filename, ".dpkg-dist") ||
-                endswith(filename, ".dpkg-bak") ||
-                endswith(filename, ".dpkg-backup") ||
-                endswith(filename, ".dpkg-remove") ||
-                endswith(filename, ".ucf-new") ||
-                endswith(filename, ".ucf-old") ||
-                endswith(filename, ".ucf-dist") ||
-                endswith(filename, ".swp");
-}
+bool hidden_or_backup_file(const char *filename) {
+        const char *p;
 
-bool hidden_file(const char *filename) {
         assert(filename);
 
-        if (endswith(filename, "~"))
+        if (filename[0] == '.' ||
+            streq(filename, "lost+found") ||
+            streq(filename, "aquota.user") ||
+            streq(filename, "aquota.group") ||
+            endswith(filename, "~"))
                 return true;
 
-        return hidden_file_allow_backup(filename);
+        p = strrchr(filename, '.');
+        if (!p)
+                return false;
+
+        return STR_IN_SET(p + 1,
+                          "rpmnew",
+                          "rpmsave",
+                          "rpmorig",
+                          "dpkg-old",
+                          "dpkg-new",
+                          "dpkg-tmp",
+                          "dpkg-dist",
+                          "dpkg-bak",
+                          "dpkg-backup",
+                          "dpkg-remove",
+                          "ucf-new",
+                          "ucf-old",
+                          "ucf-dist",
+                          "swp");
 }
 
 bool is_device_path(const char *path) {
diff --git a/src/basic/path-util.h b/src/basic/path-util.h
index 34d5cd1570..a27c13fcc3 100644
--- a/src/basic/path-util.h
+++ b/src/basic/path-util.h
@@ -122,7 +122,6 @@ bool path_is_safe(const char *p) _pure_;
 
 char *file_in_same_dir(const char *path, const char *filename);
 
-bool hidden_file_allow_backup(const char *filename);
-bool hidden_file(const char *filename) _pure_;
+bool hidden_or_backup_file(const char *filename) _pure_;
 
 bool is_device_path(const char *path);
diff --git a/src/basic/util.c b/src/basic/util.c
index b70c50047f..756c663be4 100644
--- a/src/basic/util.c
+++ b/src/basic/util.c
@@ -522,7 +522,7 @@ int on_ac_power(void) {
                 if (!de)
                         break;
 
-                if (hidden_file(de->d_name))
+                if (hidden_or_backup_file(de->d_name))
                         continue;
 
                 device = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC|O_NOCTTY);