git-receiver: splitted and tested pre-receive input parser

1 files changed, 77 insertions, 0 deletions

diff --git a/src/blogc-git-receiver/pre-receive-parser.c b/src/blogc-git-receiver/pre-receive-parser.c
new file mode 100644
index 0000000..a842a9d
--- /dev/null
+++ b/src/blogc-git-receiver/pre-receive-parser.c
@@ -0,0 +1,77 @@
+/*
+ * blogc: A blog compiler.
+ * Copyright (C) 2015-2016 Rafael G. Martins <rafael@rafaelmartins.eng.br>
+ *
+ * This program can be distributed under the terms of the BSD License.
+ * See the file LICENSE.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "../common/utils.h"
+#include "pre-receive-parser.h"
+
+typedef enum {
+    START_OLD = 1,
+    OLD,
+    START_NEW,
+    NEW,
+    START_REF,
+    REF
+} input_state_t;
+
+
+char*
+bgr_pre_receive_parse(const char *input)
+{
+    input_state_t state = START_OLD;
+    size_t start = 0;
+    size_t start_new = 0;
+    size_t input_len = strlen(input);
+
+    for (size_t current = 0; current < input_len; current++) {
+
+        char c = input[current];
+
+        switch (state) {
+            case START_OLD:
+                start = current;
+                state = OLD;
+                break;
+            case OLD:
+                if (c != ' ')
+                    break;
+                // no need to store old
+                state = START_NEW;
+                break;
+            case START_NEW:
+                start = current;
+                state = NEW;
+                break;
+            case NEW:
+                if (c != ' ')
+                    break;
+                state = START_REF;
+                start_new = start;
+                break;
+            case START_REF:
+                start = current;
+                state = REF;
+                break;
+            case REF:
+                if (c != '\n')
+                    break;
+                state = START_OLD;
+                // we just care about a ref (refs/heads/master), everything
+                // else is disposable :)
+                if ((current - start == 17) &&
+                    (0 == strncmp("refs/heads/master", input + start, 17)))
+                {
+                    return bc_strndup(input + start_new, start - 1 - start_new);
+                }
+                break;
+        }
+    }
+
+    return NULL;
+}