From 456b8fc754e4fb63ab25913910b4c42f06d43b75 Mon Sep 17 00:00:00 2001
From: Tyge Løvset <60263450+tylo-work@users.noreply.github.com>
Date: Mon, 9 Mar 2020 00:58:42 +0100
Subject: added cstring_makeTemp

---
 cmap_test.c |  3 +++
 cstring.h   | 14 +++++++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/cmap_test.c b/cmap_test.c
index 3db1252f..fcb138b7 100644
--- a/cmap_test.c
+++ b/cmap_test.c
@@ -91,6 +91,9 @@ int main()
 
     stringSpeed(20000);
     
+    CString tmp = cstring_makeTemp("I will automatically be destroyed when going out of scope");
+    printf("tmp: %s\n", tmp.str);
+    
     CString cs = cstring_make("one-nine-three-seven-five");
     printf("%s.\n", cs.str);
     cstring_insert(&cs, 3, "-two");
diff --git a/cstring.h b/cstring.h
index 42f2ea76..b6529528 100644
--- a/cstring.h
+++ b/cstring.h
@@ -43,16 +43,24 @@ static size_t _cstring_null_rep[] = {0, 0, 0};
 #define cstring_size(cs)      ((size_t) _cstring_rep(cs)[0])
 #define cstring_capacity(cs)  ((size_t) _cstring_rep(cs)[1])
 #define cstring_npos          ((size_t) -1)
+#define cstring_makeTemp(str) _cstring_makeTemp(str, (size_t *) alloca(2 * sizeof(size_t) + strlen(str) + 1))
 
 
+static inline CString _cstring_makeTemp(const char* str, size_t *rep) {
+	CString cs = {(char *) (rep + 2)};
+	strcpy(cs.str, str);
+    rep[0] = strlen(str);
+    rep[1] = 0; // no cap -> no destroy. OK
+    return cs;
+}
+
 static inline void cstring_reserve(CString* self, size_t cap) {
     size_t len = cstring_size(*self), oldcap = cstring_capacity(*self);
     if (cap > oldcap) {
         size_t* rep = (size_t *) realloc(oldcap ? _cstring_rep(*self) : NULL, sizeof(size_t) * 2 + cap + 1);
-        rep[0] = len;
-        rep[1] = cap;
         self->str = (char* ) (rep + 2);
-        self->str[len] = '\0';
+        self->str[ rep[0] = len ] = '\0';
+        rep[1] = cap;
     }
 }
 
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