update: redesigning ctx functions and structure

src/database/changes.c

@@ -0,0 +1,52 @@
+#include "../../include/database.h"
+#include "../../include/error.h"
+#include "../../include/util.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+bool lm_database_changes_update(lm_database_t *db, lm_pkg_t *pkg, char *file){
+  if(NULL == db || NULL == pkg || NULL == file){
+    lm_error_set(LM_ERR_ArgNULL);
+    return false;
+  }
+
+  char changes_file[strlen(db->dir)+strlen(pkg->name)+20];
+  join_multiple(changes_file, db->dir, pkg->name, "changes");
+
+  if(!copy_file(changes_file, file))
+    return false; // error set by function
+  
+  return true;
+}
+
+bool lm_database_changes_del(lm_database_t *db, lm_pkg_t *pkg){
+  if(NULL == db || NULL == pkg){
+    lm_error_set(LM_ERR_ArgNULL);
+    return false;
+  }
+
+  char changes_file[strlen(db->dir)+strlen(pkg->name)+20];
+  join_multiple(changes_file, db->dir, pkg->name, "changes");
+
+  if(unlink(changes_file) < 0 && errno != ENOENT){
+    lm_error_set(LM_ERR_DbChangesUnlinkFail);
+    return false;
+  }
+  
+  return true;
+}
+
+char *lm_database_changes_get(lm_database_t *db, lm_pkg_t *pkg){
+  char *changes_file = malloc(strlen(db->dir)+strlen(pkg->name)+20);
+  join_multiple(changes_file, db->dir, pkg->name, "changes");
+
+  if(!exists(changes_file)){
+    free(changes_file);
+    return NULL;
+  }
+
+  return changes_file;
+}