From f1cd7de018b623d19a8f42ac47f0271a28eedcce Mon Sep 17 00:00:00 2001
From: Jan Breuer <jan.breuer@jaybee.cz>
Date: 周日, 19 4月 2015 06:43:16 +0800
Subject: [PATCH] Implement Traversal of the Header Tree. Solve #22
---
libscpi/src/utils.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 45 insertions(+), 0 deletions(-)
diff --git a/libscpi/src/utils.c b/libscpi/src/utils.c
index c40ddb6..710d8e0 100644
--- a/libscpi/src/utils.c
+++ b/libscpi/src/utils.c
@@ -441,6 +441,51 @@
return result;
}
+/**
+ * Compose command from previsou command anc current command
+ *
+ * @param prev pointer to previous command
+ * @param current pointer of current command
+ *
+ * prev and current should be in the same memory buffer
+ */
+scpi_bool_t composeCompoundCommand(const scpi_token_t * prev, scpi_token_t * current) {
+ size_t i;
+
+ /* Invalid input */
+ if (current == NULL || current->ptr == NULL || current->len == 0)
+ return FALSE;
+
+ /* no previous command - nothing to do*/
+ if (prev->ptr == NULL || prev->len == 0)
+ return TRUE;
+
+ /* Common command or command root - nothing to do */
+ if (current->ptr[0] == '*' || current->ptr[0] == ':')
+ return TRUE;
+
+ /* Previsou command was common command - nothing to do */
+ if (prev->ptr[0] == '*')
+ return TRUE;
+
+ /* Find last occurence of ':' */
+ for (i = prev->len; i > 0; i--) {
+ if (prev->ptr[i - 1] == ':') {
+ break;
+ }
+ }
+
+ /* Previous command was simple command - nothing to do*/
+ if (i == 0)
+ return TRUE;
+
+ current->ptr -= i;
+ current->len += i;
+ memmove(current->ptr, prev->ptr, i);
+ return TRUE;
+}
+
+
#if !HAVE_STRNLEN
/* use FreeBSD strnlen */
--
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