path: added mkpath

docs/technical/path.txt

@@ -17,7 +17,12 @@ Functions
 `is_dir()`::
 
     Returns a non zero value if 'path' is a directory. zero otherwise.
-    
+
+`mkpath()`::
+
+    Formats a "functional correct" path (that works with `open()`, `stat()` etc). +
+    Returns a staticly allocated string.
+
 `path_normalize`::
 
 Returns a string that contains the normalized full path specified by 'base', 'name' and 'dir'. +

src/path.c

@@ -67,6 +67,32 @@ int is_dir(const char *path) {
     return 0;
 }
 
+const char *mkpath(const char *fmt, ...) {
+
+    static strbuf_t sb = STRBUF_INIT;
+    va_list va;
+    int len;
+
+    if (strbuf_avail(&sb)) {
+        strbuf_reduce(&sb, sb.len);
+    } else {
+        strbuf_expand(&sb, 1);
+    }
+    
+    va_start(va, fmt);
+    len = strbuf_append_va(&sb, fmt, va);
+    va_end(va);
+
+    if (len > 0) {
+        strbuf_expand(&sb, len);
+        va_start(va, fmt);
+        strbuf_append_va(&sb, fmt, va);
+        va_end(va);
+    }
+
+    return sb.buf;
+}
+
 static char* expand_home() {
 
     char *home = getenv("HOME");

src/path.h

@@ -20,6 +20,8 @@ int is_file(const char *path);
 
 int is_dir(const char *path);
 
+const char* mkpath(const char *fmt, ...);
+
 char* path_normalize(const char *base, const char *name, unsigned dir);
 
 #endif /* __PATH_H */

test/t_path.c

@@ -36,6 +36,12 @@ void test_normalize() {
     free(ptr);
 }
 
+void test_mkpath() {
+
+    assert_string(mkpath("%s/%s", "/mnt/", "file"), "/mnt//file");
+    assert_string(mkpath("%s/%s%i", "/dev", "tty", 2), "/dev/tty2");
+}
+
 void test_isabspath() {
 
     assert(is_abspath("file") == 0);
@@ -115,6 +121,7 @@ int main(int argc, char *argv[]) {
     test_isfile();
     test_isdir();
     test_normalize();
+    test_mkpath();
     test_basename();
     test_dirname();