clang: fix numerous little issues found with clang-analyzer

[elogind.git] / src / util.c

diff --git a/src/util.c b/src/util.c
index ec5c7ca91aacbb19c807015c402fc5baed38cba1..a2def28730c935f0f3bc684ac37b5ebe8410d11e 100644 (file)
--- a/src/util.c
+++ b/src/util.c
@@ -62,11 +62,11 @@
 
 static struct selabel_handle *label_hnd = NULL;
 
-static inline int use_selinux(void) {
+static inline bool use_selinux(void) {
         static int use_selinux_ind = -1;
 
-        if (use_selinux_ind == -1)
-                use_selinux_ind = (is_selinux_enabled() == 1);
+        if (use_selinux_ind < 0)
+                use_selinux_ind = is_selinux_enabled() > 0;
 
         return use_selinux_ind;
 }
@@ -84,6 +84,8 @@ static int label_get_file_label_from_path(
         r = getfilecon(path, &dir_con);
         if (r >= 0) {
                 r = -1;
+                errno = EINVAL;
+
                 if ((sclass = string_to_security_class(class)) != 0)
                         r = security_compute_create((security_context_t) label, dir_con, sclass, fcon);
         }
@@ -1934,6 +1936,12 @@ char *format_timespan(char *buf, size_t l, usec_t t) {
         if (t == (usec_t) -1)
                 return NULL;
 
+        if (t == 0) {
+                snprintf(p, l, "0");
+                p[l-1] = 0;
+                return p;
+        }
+
         /* The result of this function can be parsed with parse_usec */
 
         for (i = 0; i < ELEMENTSOF(table); i++) {
@@ -3077,18 +3085,18 @@ char *replace_env(const char *format, char **env) {
 
                 case VARIABLE:
                         if (*e == '}') {
-                                char *t;
+                                const char *t;
 
-                                if ((t = strv_env_get_with_length(env, word+2, e-word-2))) {
-                                        if (!(k = strappend(r, t)))
-                                                goto fail;
+                                if (!(t = strv_env_get_with_length(env, word+2, e-word-2)))
+                                        t = "";
 
-                                        free(r);
-                                        r = k;
+                                if (!(k = strappend(r, t)))
+                                        goto fail;
 
-                                        word = e+1;
-                                }
+                                free(r);
+                                r = k;
 
+                                word = e+1;
                                 state = WORD;
                         }
                         break;
@@ -3118,36 +3126,39 @@ char **replace_env_argv(char **argv, char **env) {
         STRV_FOREACH(i, argv) {
 
                 /* If $FOO appears as single word, replace it by the split up variable */
-                if ((*i)[0] == '$') {
-                        char *e = strv_env_get(env, *i+1);
+                if ((*i)[0] == '$' && (*i)[1] != '{') {
+                        char *e;
+                        char **w, **m;
+                        unsigned q;
 
-                        if (e) {
-                                char **w, **m;
-                                unsigned q;
+                        if ((e = strv_env_get(env, *i+1))) {
 
                                 if (!(m = strv_split_quoted(e))) {
                                         r[k] = NULL;
                                         strv_free(r);
                                         return NULL;
                                 }
+                        } else
+                                m = NULL;
 
-                                q = strv_length(m);
-                                l = l + q - 1;
+                        q = strv_length(m);
+                        l = l + q - 1;
 
-                                if (!(w = realloc(r, sizeof(char*) * (l+1)))) {
-                                        r[k] = NULL;
-                                        strv_free(r);
-                                        strv_free(m);
-                                        return NULL;
-                                }
+                        if (!(w = realloc(r, sizeof(char*) * (l+1)))) {
+                                r[k] = NULL;
+                                strv_free(r);
+                                strv_free(m);
+                                return NULL;
+                        }
 
-                                r = w;
+                        r = w;
+                        if (m) {
                                 memcpy(r + k, m, q * sizeof(char*));
                                 free(m);
-
-                                k += q;
-                                continue;
                         }
+
+                        k += q;
+                        continue;
                 }
 
                 /* If ${FOO} appears as part of a word, replace it by the variable as-is */