4 files changed, 74 insertions, 0 deletions
diff --git a/src/basic/fileio.c b/src/basic/fileio.c
index 29f5374222..0360a8eab3 100644
--- a/src/basic/fileio.c
+++ b/src/basic/fileio.c
@@ -1354,3 +1354,44 @@ int link_tmpfile(int fd, const char *path, const char *target) {
 
         return 0;
 }
+
+int read_nul_string(FILE *f, char **ret) {
+        _cleanup_free_ char *x = NULL;
+        size_t allocated = 0, n = 0;
+
+        assert(f);
+        assert(ret);
+
+        /* Reads a NUL-terminated string from the specified file. */
+
+        for (;;) {
+                int c;
+
+                if (!GREEDY_REALLOC(x, allocated, n+2))
+                        return -ENOMEM;
+
+                c = fgetc(f);
+                if (c == 0) /* Terminate at NUL byte */
+                        break;
+                if (c == EOF) {
+                        if (ferror(f))
+                                return -errno;
+                        break; /* Terminate at EOF */
+                }
+
+                x[n++] = (char) c;
+        }
+
+        if (x)
+                x[n] = 0;
+        else {
+                x = new0(char, 1);
+                if (!x)
+                        return -ENOMEM;
+        }
+
+        *ret = x;
+        x = NULL;
+
+        return 0;
+}
diff --git a/src/basic/fileio.h b/src/basic/fileio.h
index 58dbc80c24..9ac497d9eb 100644
--- a/src/basic/fileio.h
+++ b/src/basic/fileio.h
@@ -86,3 +86,5 @@ int open_tmpfile_unlinkable(const char *directory, int flags);
 int open_tmpfile_linkable(const char *target, int flags, char **ret_path);
 
 int link_tmpfile(int fd, const char *path, const char *target);
+
+int read_nul_string(FILE *f, char **ret);
diff --git a/src/basic/fs-util.c b/src/basic/fs-util.c
index e24e7036f7..f0c6f3265e 100644
--- a/src/basic/fs-util.c
+++ b/src/basic/fs-util.c
@@ -38,6 +38,7 @@
 #include "mkdir.h"
 #include "parse-util.h"
 #include "path-util.h"
+#include "stat-util.h"
 #include "stdio-util.h"
 #include "string-util.h"
 #include "strv.h"
@@ -495,6 +496,34 @@ int get_files_in_directory(const char *path, char ***list) {
         return n;
 }
 
+int var_tmp(char **ret) {
+        const char *tmp_dir = NULL;
+        const char *env_tmp_dir = NULL;
+        char *c = NULL;
+        int r;
+
+        assert(ret);
+
+        env_tmp_dir = getenv("TMPDIR");
+        if (env_tmp_dir != NULL) {
+                r = is_dir(env_tmp_dir, true);
+                if (r < 0 && r != -ENOENT)
+                        return r;
+                if (r > 0)
+                        tmp_dir = env_tmp_dir;
+        }
+
+        if (!tmp_dir)
+                tmp_dir = "/var/tmp";
+
+        c = strdup(tmp_dir);
+        if (!c)
+                return -ENOMEM;
+        *ret = c;
+
+        return 0;
+}
+
 int inotify_add_watch_fd(int fd, int what, uint32_t mask) {
         char path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int) + 1];
         int r;
diff --git a/src/basic/fs-util.h b/src/basic/fs-util.h
index 517b599d6f..075e5942b1 100644
--- a/src/basic/fs-util.h
+++ b/src/basic/fs-util.h
@@ -61,6 +61,8 @@ int mkfifo_atomic(const char *path, mode_t mode);
 
 int get_files_in_directory(const char *path, char ***list);
 
+int var_tmp(char **ret);
+
 #define INOTIFY_EVENT_MAX (sizeof(struct inotify_event) + NAME_MAX + 1)
 
 #define FOREACH_INOTIFY_EVENT(e, buffer, sz) \