strv: add calls to add two entries to an strv at once

src/shared/strv.c

@@ -388,7 +388,7 @@ int strv_push(char ***l, char *value) {
 
         n = strv_length(*l);
 
-        /* increase and check for overflow */
+        /* Increase and check for overflow */
         m = n + 2;
         if (m < n)
                 return -ENOMEM;
@@ -404,6 +404,34 @@ int strv_push(char ***l, char *value) {
         return 0;
 }
 
+int strv_push_pair(char ***l, char *a, char *b) {
+        char **c;
+        unsigned n, m;
+
+        if (!a && !b)
+                return 0;
+
+        n = strv_length(*l);
+
+        /* increase and check for overflow */
+        m = n + !!a + !!b + 1;
+        if (m < n)
+                return -ENOMEM;
+
+        c = realloc_multiply(*l, sizeof(char*), m);
+        if (!c)
+                return -ENOMEM;
+
+        if (a)
+                c[n++] = a;
+        if (b)
+                c[n++] = b;
+        c[n] = NULL;
+
+        *l = c;
+        return 0;
+}
+
 int strv_push_prepend(char ***l, char *value) {
         char **c;
         unsigned n, m, i;
@@ -444,6 +472,18 @@ int strv_consume(char ***l, char *value) {
         return r;
 }
 
+int strv_consume_pair(char ***l, char *a, char *b) {
+        int r;
+
+        r = strv_push_pair(l, a, b);
+        if (r < 0) {
+                free(a);
+                free(b);
+        }
+
+        return r;
+}
+
 int strv_consume_prepend(char ***l, char *value) {
         int r;
 

src/shared/strv.h

@@ -42,8 +42,10 @@ int strv_extend_strv_concat(char ***a, char **b, const char *suffix);
 int strv_extend(char ***l, const char *value);
 int strv_extendf(char ***l, const char *format, ...) _printf_(2,0);
 int strv_push(char ***l, char *value);
+int strv_push_pair(char ***l, char *a, char *b);
 int strv_push_prepend(char ***l, char *value);
 int strv_consume(char ***l, char *value);
+int strv_consume_pair(char ***l, char *a, char *b);
 int strv_consume_prepend(char ***l, char *value);
 
 char **strv_remove(char **l, const char *s);

src/test/test-strv.c

@@ -453,6 +453,23 @@ static void test_strv_push_prepend(void) {
         assert_se(!a[5]);
 }
 
+static void test_strv_push(void) {
+        _cleanup_strv_free_ char **a = NULL;
+        char *i, *j;
+
+        assert_se(i = strdup("foo"));
+        assert_se(strv_push(&a, i) >= 0);
+
+        assert_se(i = strdup("a"));
+        assert_se(j = strdup("b"));
+        assert_se(strv_push_pair(&a, i, j) >= 0);
+
+        assert_se(streq_ptr(a[0], "foo"));
+        assert_se(streq_ptr(a[1], "a"));
+        assert_se(streq_ptr(a[2], "b"));
+        assert_se(streq_ptr(a[3], NULL));
+}
+
 int main(int argc, char *argv[]) {
         test_specifier_printf();
         test_strv_foreach();
@@ -501,6 +518,7 @@ int main(int argc, char *argv[]) {
         test_strv_extendf();
         test_strv_from_stdarg_alloca();
         test_strv_push_prepend();
+        test_strv_push();
 
         return 0;
 }