4 files changed, 79 insertions, 0 deletions
diff --git a/src/libudev/strv.c b/src/libudev/strv.c
index 041e20d700..3619701e9d 100644
--- a/src/libudev/strv.c
+++ b/src/libudev/strv.c
@@ -142,6 +142,43 @@ char **strv_new(const char *x, ...) {
         return r;
 }
 
+int strv_push(char ***l, char *value) {
+        char **c;
+        unsigned n;
+
+        if (!value)
+                return 0;
+
+        n = strv_length(*l);
+        c = realloc(*l, sizeof(char*) * (n + 2));
+        if (!c)
+                return -ENOMEM;
+
+        c[n] = value;
+        c[n+1] = NULL;
+
+        *l = c;
+        return 0;
+}
+
+int strv_extend(char ***l, const char *value) {
+        char *v;
+        int r;
+
+        if (!value)
+                return 0;
+
+        v = strdup(value);
+        if (!v)
+                return -ENOMEM;
+
+        r = strv_push(l, v);
+        if (r < 0)
+                free(v);
+
+        return r;
+}
+
 char **strv_uniq(char **l) {
         char **i;
 
diff --git a/src/libudev/strv.h b/src/libudev/strv.h
index d9e0e1c20b..9fba94e566 100644
--- a/src/libudev/strv.h
+++ b/src/libudev/strv.h
@@ -36,6 +36,9 @@ static inline void strv_freep(char ***l) {
 char **strv_copy(char * const *l);
 unsigned strv_length(char * const *l) _pure_;
 
+int strv_extend(char ***l, const char *value);
+int strv_push(char ***l, char *value);
+
 char **strv_remove(char **l, const char *s);
 char **strv_uniq(char **l);
 
diff --git a/src/libudev/util.c b/src/libudev/util.c
index f625cfe99b..61d000c350 100644
--- a/src/libudev/util.c
+++ b/src/libudev/util.c
@@ -664,6 +664,41 @@ int null_or_empty_path(const char *fn) {
         return null_or_empty(&st);
 }
 
+char hexchar(int x) {
+        static const char table[16] = "0123456789abcdef";
+
+        return table[x & 15];
+}
+
+char *xescape(const char *s, const char *bad) {
+        char *r, *t;
+        const char *f;
+
+        /* Escapes all chars in bad, in addition to \ and all special
+         * chars, in \xFF style escaping. May be reversed with
+         * cunescape. */
+
+        r = new(char, strlen(s) * 4 + 1);
+        if (!r)
+                return NULL;
+
+        for (f = s, t = r; *f; f++) {
+
+                if ((*f < ' ') || (*f >= 127) ||
+                    (*f == '\\') || strchr(bad, *f)) {
+                        *(t++) = '\\';
+                        *(t++) = 'x';
+                        *(t++) = hexchar(*f >> 4);
+                        *(t++) = hexchar(*f);
+                } else
+                        *(t++) = *f;
+        }
+
+        *t = 0;
+
+        return r;
+}
+
 bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) {
         assert(de);
 
diff --git a/src/libudev/util.h b/src/libudev/util.h
index 60b300da3c..7b6571ab10 100644
--- a/src/libudev/util.h
+++ b/src/libudev/util.h
@@ -131,6 +131,10 @@ char *strnappend(const char *s, const char *suffix, size_t length);
 
 char *truncate_nl(char *s);
 
+char hexchar(int x) _const_;
+
+char *xescape(const char *s, const char *bad);
+
 bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) _pure_;
 
 bool ignore_file(const char *filename) _pure_;