add misc/expstring.h

misc/expstring.h

@@ -0,0 +1,80 @@
+/**
+ * @file expstring.h
+ * @author Ambroz Bizjak <ambrop7@gmail.com>
+ * 
+ * @section LICENSE
+ * 
+ * This file is part of BadVPN.
+ * 
+ * BadVPN is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ * 
+ * BadVPN is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef BADVPN_MISC_EXPSTRING_H
+#define BADVPN_MISC_EXPSTRING_H
+
+#include <stddef.h>
+
+#include <misc/debug.h>
+#include <misc/exparray.h>
+
+typedef struct {
+    struct ExpArray arr;
+    size_t n;
+} ExpString;
+
+static int ExpString_Init (ExpString *c);
+static void ExpString_Free (ExpString *c);
+static int ExpString_Append (ExpString *c, char *str);
+static char * ExpString_Get (ExpString *c);
+
+int ExpString_Init (ExpString *c)
+{
+    if (!ExpArray_init(&c->arr, 1, 16)) {
+        return 0;
+    }
+    
+    c->n = 0;
+    ((char *)c->arr.v)[c->n] = '\0';
+    
+    return 1;
+}
+
+void ExpString_Free (ExpString *c)
+{
+    free(c->arr.v);
+}
+
+int ExpString_Append (ExpString *c, char *str)
+{
+    ASSERT(str)
+    
+    size_t l = strlen(str);
+    
+    if (!ExpArray_resize(&c->arr, c->n + l + 1)) {
+        return 0;
+    }
+    
+    memcpy((char *)c->arr.v + c->n, str, l);
+    c->n += l;
+    ((char *)c->arr.v)[c->n] = '\0';
+    
+    return 1;
+}
+
+char * ExpString_Get (ExpString *c)
+{
+    return (char *)c->arr.v;
+}
+
+#endif