internal implementation file

skeletons/asn_internal.c

+#include <asn_internal.h>
+
+ssize_t
+asn__format_to_callback(int (*cb)(const void *, size_t, void *key), void *key,
+                        const char *fmt, ...) {
+    char scratch[64];
+    char *buf = scratch;
+    size_t buf_size = sizeof(scratch);
+    int wrote;
+    int cb_ret;
+
+    do {
+        va_list args;
+        va_start(args, fmt);
+
+        wrote = vsnprintf(buf, buf_size, fmt, args);
+        if(wrote < (ssize_t)buf_size) {
+            if(wrote < 0) {
+                if(buf != scratch) FREEMEM(buf);
+                return -1;
+            }
+            break;
+        }
+
+        buf_size <<= 1;
+        if(buf == scratch) {
+            buf = MALLOC(buf_size);
+            if(!buf) return -1;
+        } else {
+            void *p = REALLOC(buf, buf_size);
+            if(!p) {
+                FREEMEM(buf);
+                return -1;
+            }
+            buf = p;
+        }
+    } while(1);
+
+    cb_ret = cb(buf, wrote, key);
+    if(buf != scratch) FREEMEM(buf);
+    if(cb_ret < 0) {
+        return -1;
+    }
+
+    return wrote;
+}
+