Remove string_erase

TODO

@@ -90,7 +90,7 @@ Features:
   usefaultd() and make systemd-analyze check for it.
 
 * paranoia: whenever we process passwords, call mlock() on the memory
-  first. i.e. look for all places we use string_erase()/free_and_erasep() and
+  first. i.e. look for all places we use free_and_erasep() and
   augment them with mlock(). Also use MADV_DONTDUMP.
 
 * Move RestrictAddressFamily= to the new cgroup create socket

src/basic/string-util.c

@@ -1032,16 +1032,6 @@ int free_and_strndup(char **p, const char *s, size_t l) {
         return 1;
 }
 
-char* string_erase(char *x) {
-        if (!x)
-                return NULL;
-
-        /* A delicious drop of snake-oil! To be called on memory where
-         * we stored passphrases or so, after we used them. */
-        explicit_bzero_safe(x, strlen(x));
-        return x;
-}
-
 bool string_is_safe(const char *p) {
         const char *t;
 

src/basic/string-util.h

@@ -197,8 +197,6 @@ static inline int free_and_strdup_warn(char **p, const char *s) {
 }
 int free_and_strndup(char **p, const char *s, size_t l);
 
-char *string_erase(char *x);
-
 bool string_is_safe(const char *p) _pure_;
 
 static inline size_t strlen_ptr(const char *s) {

src/basic/strv.c

@@ -11,6 +11,7 @@
 #include "escape.h"
 #include "extract-word.h"
 #include "fileio.h"
+#include "memory-util.h"
 #include "nulstr-util.h"
 #include "sort-util.h"
 #include "string-util.h"
@@ -78,9 +79,9 @@ char **strv_free_erase(char **l) {
         char **i;
 
         STRV_FOREACH(i, l)
-                string_erase(*i);
+                erase_and_freep(i);
 
-        return strv_free(l);
+        return mfree(l);
 }
 
 char **strv_copy(char * const *l) {

src/journal/journalctl.c

@@ -753,7 +753,7 @@ static int parse_argv(int argc, char *argv[]) {
                         r = free_and_strdup(&arg_verify_key, optarg);
                         if (r < 0)
                                 return r;
-                        /* Use memset not string_erase so this doesn't look confusing
+                        /* Use memset not explicit_bzero() or similar so this doesn't look confusing
                          * in ps or htop output. */
                         memset(optarg, 'x', strlen(optarg));
 

src/test/test-string-util.c

@@ -9,29 +9,6 @@
 #include "utf8.h"
 #include "util.h"
 
-static void test_string_erase(void) {
-        char *x;
-
-        x = strdupa("");
-        assert_se(streq(string_erase(x), ""));
-
-        x = strdupa("1");
-        assert_se(streq(string_erase(x), ""));
-
-        x = strdupa("123456789");
-        assert_se(streq(string_erase(x), ""));
-
-        assert_se(x[1] == '\0');
-        assert_se(x[2] == '\0');
-        assert_se(x[3] == '\0');
-        assert_se(x[4] == '\0');
-        assert_se(x[5] == '\0');
-        assert_se(x[6] == '\0');
-        assert_se(x[7] == '\0');
-        assert_se(x[8] == '\0');
-        assert_se(x[9] == '\0');
-}
-
 static void test_free_and_strndup_one(char **t, const char *src, size_t l, const char *expected, bool change) {
         int r;
 
@@ -582,7 +559,6 @@ static void test_memory_startswith_no_case(void) {
 int main(int argc, char *argv[]) {
         test_setup_logging(LOG_DEBUG);
 
-        test_string_erase();
         test_free_and_strndup();
         test_ascii_strcasecmp_n();
         test_ascii_strcasecmp_nn();