1 files changed, 95 insertions, 0 deletions
diff --git a/src/dynstr.c b/src/dynstr.c
new file mode 100644
index 0000000..fa9e9e0
--- /dev/null
+++ b/src/dynstr.c
@@ -0,0 +1,95 @@
+#include "common.h"
+
+#include "dynstr.h"
+
+dynstr_t* dynstr_new(void)
+{
+    dynstr_t* str = calloc(1, sizeof(dynstr_t));
+    if (str)
+    {
+        str->size = 64;
+        str->data = malloc(str->size);
+        if (!str->data)
+        {
+            free(str);
+            return NULL;
+        }
+    }
+    return str;
+}
+
+dynstr_t* dynstr_new_strn(const char* cstr, size_t len)
+{
+    dynstr_t* str = calloc(1, sizeof(dynstr_t));
+    assert(cstr);
+    if (str)
+    {
+        str->len = len;
+        str->size = len + 1;
+        str->data = malloc(str->size);
+        if (!str->data)
+        {
+            free(str);
+            return NULL;
+        }
+        memcpy(str->data, cstr, len);
+    }
+    return str;
+}
+
+void dynstr_free(dynstr_t* str)
+{
+    if (str)
+    {
+        free(str->data);
+        free(str);
+    }
+}
+
+char* dynstr_done(dynstr_t* str)
+{
+    char* ret;
+    assert(str);
+    assert(str->len < str->size);
+    str->data[str->len] = '\0';
+    ret = str->data;
+    free(str);
+    return ret;
+}
+
+const char* dynstr_peek(dynstr_t* str)
+{
+    assert(str);
+    assert(str->len < str->size);
+    str->data[str->len] = '\0';
+    return str->data;
+}
+
+bool dynstr_nappend(dynstr_t* str, const char* add, size_t len)
+{
+    assert(str && add);
+    if (str->len + len >= str->size)
+    {
+        size_t ns = MAX(str->size * 2, str->len + len + 1);
+        char* tmp = realloc(str->data, ns);
+        if (!tmp)
+        {
+            return false;
+        }
+        str->data = tmp;
+        str->size = ns;
+    }
+    memcpy(str->data + str->len, add, len);
+    str->len += len;
+    return true;
+}
+
+void dynstr_cut(dynstr_t* str, size_t newlen)
+{
+    assert(str);
+    assert(newlen <= str->len);
+    if (newlen < str->len)
+    {
+        str->len = newlen;
+    }
+}