dynbuf: provide curlx_ names for reuse by the curl tool

Closes #5946

lib/dynbuf.c

@@ -21,12 +21,11 @@
  ***************************************************************************/
 
 #include "curl_setup.h"
-#include "strdup.h"
 #include "dynbuf.h"
-
-/* The last 3 #include files should be in this order */
 #include "curl_printf.h"
+#ifdef BUILDING_LIBCURL
 #include "curl_memory.h"
+#endif
 #include "memdebug.h"
 
 #define MIN_FIRST_ALLOC 32
@@ -94,11 +93,15 @@ static CURLcode dyn_nappend(struct dynbuf *s,
   }
 
   if(a != s->allc) {
-    s->bufr = Curl_saferealloc(s->bufr, a);
-    if(!s->bufr) {
+    /* this logic is not using Curl_saferealloc() to make the tool not have to
+       include that as well when it uses this code */
+    void *p = realloc(s->bufr, a);
+    if(!p) {
+      Curl_safefree(s->bufr);
       s->leng = s->allc = 0;
       return CURLE_OUT_OF_MEMORY;
     }
+    s->bufr = p;
     s->allc = a;
   }
 

lib/dynbuf.h

@@ -22,6 +22,22 @@
  *
  ***************************************************************************/
 
+#ifndef BUILDING_LIBCURL
+/* this renames the functions so that the tool code can use the same code
+   without getting symbol collisions */
+#define Curl_dyn_init(a,b) curlx_dyn_init(a,b)
+#define Curl_dyn_add(a,b) curlx_dyn_add(a,b)
+#define Curl_dyn_addn(a,b,c) curlx_dyn_addn(a,b,c)
+#define Curl_dyn_addf curlx_dyn_addf
+#define Curl_dyn_free(a) curlx_dyn_free(a)
+#define Curl_dyn_ptr(a) curlx_dyn_ptr(a)
+#define Curl_dyn_uptr(a) curlx_dyn_uptr(a)
+#define Curl_dyn_len(a) curlx_dyn_len(a)
+#define Curl_dyn_reset(a) curlx_dyn_reset(a)
+#define Curl_dyn_tail(a,b) curlx_dyn_tail(a,b)
+#define curlx_dynbuf dynbuf /* for the struct name */
+#endif
+
 struct dynbuf {
   char *bufr;    /* point to a null-terminated allocated buffer */
   size_t leng;   /* number of bytes *EXCLUDING* the zero terminator */