1 files changed, 68 insertions, 0 deletions
diff --git a/src/dged/path.c b/src/dged/path.c
new file mode 100644
index 0000000..735ef0c
--- /dev/null
+++ b/src/dged/path.c
@@ -0,0 +1,68 @@
+#include "path.h"
+
+#include <limits.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+char *expanduser(const char *path) {
+  // replace tilde
+  char *res = NULL;
+  char *tilde_pos = strchr(path, '~');
+  if (tilde_pos != NULL) {
+    char *home = getenv("HOME");
+    if (home != NULL) {
+      // allocate a new string based with the new len
+      size_t home_len = strlen(home);
+      size_t path_len = strlen(path);
+      size_t total_len = path_len + home_len;
+      res = malloc(total_len);
+      size_t initial_len = tilde_pos - path;
+      strncpy(res, path, initial_len);
+
+      strncpy(res + initial_len, home, home_len + 1);
+
+      size_t rest_len = path_len - initial_len - 1;
+      strncpy(res + initial_len + home_len, path + initial_len + 1, rest_len);
+      res[total_len - 1] = '\0';
+    }
+  }
+
+  return res != NULL ? res : strdup(path);
+}
+
+char *to_abspath(const char *path) {
+  char *exp = expanduser(path);
+  char *p = realpath(path, NULL);
+  if (p != NULL) {
+    free(exp);
+    return p;
+  } else {
+    return exp;
+  }
+}
+
+const char *join_path_with_delim(const char *p1, const char *p2,
+                                 const char delim) {
+  size_t len1 = strlen(p1);
+  size_t len2 = strlen(p2);
+
+  char *path = malloc(len1 + len2 + 2);
+  uint32_t idx = 0;
+  memcpy(&path[idx], p1, len1);
+  idx += len1;
+  path[idx++] = delim;
+  memcpy(&path[idx], p2, len2);
+  idx += len2;
+  path[idx++] = '\0';
+
+  return path;
+}
+
+const char *join_path(const char *p1, const char *p2) {
+#ifdef __unix__
+  return join_path_with_delim(p1, p2, '/');
+#elif defined(_WIN32) || defined(WIN32)
+  return join_path_with_delim(p1, p2, '\\');
+#endif
+}