[svn] Changes from <9t9pusol5a1.fsf@mraz.iskon.hr>.

[wget] / src / wget.h

diff --git a/src/wget.h b/src/wget.h
index ab37507ee6a12a256989409991a0283b007dca6d..1a1fdb4589f220abaf5a9b5ef4391170a0b29ea3 100644 (file)
--- a/src/wget.h
+++ b/src/wget.h
@@ -160,6 +160,35 @@ char *xstrdup PARAMS ((const char *));
     XREALLOC_ARRAY (basevar, type, do_realloc_newsize);                \
 } while (0)
 
+/* Use this for small stack-allocated memory chunks that might grow.
+   The initial array is created using alloca(), and this macro
+   requests it to grow.  If the needed size is larger than the array,
+   this macro will use malloc to allocate it to new size, and copy the
+   old contents.  After that, successive invocations behave just like
+   DO_REALLOC.  */
+#define DO_REALLOC_FROM_ALLOCA(basevar, sizevar, needed_size, allocap, type) do        \
+{                                                                              \
+  /* Avoid side-effectualness.  */                             \
+  long do_realloc_needed_size = (needed_size);                 \
+  long do_realloc_newsize = 0;                                 \
+  while ((sizevar) < (do_realloc_needed_size)) {               \
+    do_realloc_newsize = 2*(sizevar);                          \
+    if (do_realloc_newsize < 16)                               \
+      do_realloc_newsize = 16;                                 \
+    (sizevar) = do_realloc_newsize;                            \
+  }                                                            \
+  if (do_realloc_newsize)                                      \
+    if (!allocap)                                              \
+      XREALLOC_ARRAY (basevar, type, do_realloc_newsize);      \
+    else                                                       \
+      {                                                                \
+       void *drfa_new_basevar = xmalloc (do_realloc_newsize);  \
+       memcpy (drfa_new_basevar, basevar, sizevar);            \
+       (basevar) = drfa_new_basevar;                           \
+       allocap = 0;                                            \
+      }                                                                \
+} while (0)
+
 /* Free FOO if it is non-NULL.  */
 #define FREE_MAYBE(foo) do { if (foo) free (foo); } while (0)