From 288727f09a1b3458c268497d111349e608c3f9fa Mon Sep 17 00:00:00 2001
From: "bozo.kopic" <bozo@kopic.xyz>
Date: Tue, 2 Aug 2022 01:20:12 +0200
Subject: init

---
 src_c/buff.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 src_c/buff.c

(limited to 'src_c/buff.c')

diff --git a/src_c/buff.c b/src_c/buff.c
new file mode 100644
index 0000000..e22eba8
--- /dev/null
+++ b/src_c/buff.c
@@ -0,0 +1,61 @@
+#include "buff.h"
+
+
+static lsp_status_t update_str(lsp_buff_t *b) {
+    lsp_uint16_t value_len =
+        ((b->value == b->m->nil) ? 0 : lsp_mem_get_string_len(b->m, b->value));
+
+    lsp_addr_t value;
+    lsp_status_t status =
+        lsp_mem_create_string(b->m, value_len + b->buff_len, &value);
+    if (status != LSP_SUCCESS)
+        return status;
+
+    for (lsp_uint16_t i = 0; i < value_len; ++i)
+        lsp_mem_set_string_data(b->m, value, i,
+                                lsp_mem_get_string_data(b->m, b->value, i));
+
+    for (lsp_uint16_t i = 0; i < b->buff_len; ++i)
+        lsp_mem_set_string_data(b->m, value, i + value_len, b->buff[i]);
+
+    lsp_mem_dec_ref(b->m, b->value);
+    b->value = value;
+    b->buff_len = 0;
+    return LSP_SUCCESS;
+}
+
+
+void lsp_buff_init(lsp_buff_t *b, lsp_mem_t *m) {
+    b->m = m;
+    b->value = m->nil;
+    b->buff_len = 0;
+}
+
+
+lsp_status_t lsp_buff_push(lsp_buff_t *b, lsp_uint8_t c) {
+    if (b->buff_len + 1 >= LSP_BUFF_SIZE) {
+        lsp_status_t status = update_str(b);
+        if (status != LSP_SUCCESS)
+            return status;
+    }
+
+    b->buff[b->buff_len++] = c;
+    return LSP_SUCCESS;
+}
+
+
+lsp_status_t lsp_buff_pop(lsp_buff_t *b, lsp_addr_t *value) {
+    lsp_status_t status = update_str(b);
+    if (status != LSP_SUCCESS)
+        return status;
+
+    *value = b->value;
+    b->value = b->m->nil;
+    return LSP_SUCCESS;
+}
+
+
+void lsp_buff_clear(lsp_buff_t *b) {
+    lsp_mem_dec_ref(b->m, b->value);
+    b->value = b->m->nil;
+}
-- 
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