table: add teble_add_string_cell()

src/shared/format-table.c

@@ -380,6 +380,20 @@ int table_add_cell_full(
         return 0;
 }
 
+int table_add_cell_stringf(Table *t, TableCell **ret_cell, const char *format, ...) {
+        _cleanup_free_ char *buffer = NULL;
+        va_list ap;
+        int r;
+
+        va_start(ap, format);
+        r = vasprintf(&buffer, format, ap);
+        va_end(ap);
+        if (r < 0)
+                return -ENOMEM;
+
+        return table_add_cell(t, ret_cell, TABLE_STRING, buffer);
+}
+
 int table_dup_cell(Table *t, TableCell *cell) {
         size_t i;
 

src/shared/format-table.h

@@ -36,6 +36,7 @@ int table_add_cell_full(Table *t, TableCell **ret_cell, TableDataType type, cons
 static inline int table_add_cell(Table *t, TableCell **ret_cell, TableDataType type, const void *data) {
         return table_add_cell_full(t, ret_cell, type, data, (size_t) -1, (size_t) -1, (unsigned) -1, (unsigned) -1, (unsigned) -1);
 }
+int table_add_cell_stringf(Table *t, TableCell **ret_cell, const char *format, ...) _printf_(3, 4);
 
 int table_dup_cell(Table *t, TableCell *cell);