pathtoabs: Added comments and better error handling

If chdir returns anything other than 0 now, we return errno to indicate
that something went wrong with determination of the absolute path.

Also added errno.h include to handle errno values.

1 files changed, 15 insertions, 1 deletions

diff --git a/c/src/main.c b/c/src/main.c
index 341e6a4..0f30b24 100644
--- a/c/src/main.c
+++ b/c/src/main.c
@@ -20,15 +20,29 @@
 #include <string.h>
 #include <unistd.h>
 #include <libgen.h> // Provides basename and dirname
+#include <errno.h>
 
 #include "encarchive.h"
 
+
+/**
+ * pathtoabs:
+ * Converts the specified path, relative or absolute, to the absolute path
+ * equivelant.
+ * Uses the unistd getcwd and chdir to determine the absolute path, so the
+ * specified path must exist. for successful conversion
+ *
+ * @path   Path to convert to absolute
+ * @apath  Pointer to absolute path buffer (must be 2048 long)
+ */
 int pathtoabs(char* path, char* apath) {
   char startdir[1024];
   getcwd(startdir, 1024);
 
   // Change dir to the parent directory
-  chdir(dirname(path));
+  // Return errno on failure
+  if(chdir(dirname(path)) != 0)
+    return errno;
 
   getcwd(&apath[0], 2048);
   strcat(apath, "/");