1 files changed, 60 insertions, 0 deletions
diff --git a/portable/asprintf.c b/portable/asprintf.c
new file mode 100644
index 0000000..56a69c4
--- /dev/null
+++ b/portable/asprintf.c
@@ -0,0 +1,60 @@
+/*  $Id$
+**
+**  Replacement for a missing asprintf and vasprintf.
+**
+**  Written by Russ Allbery <rra@stanford.edu>
+**  This work is hereby placed in the public domain by its author.
+**
+**  Provides the same functionality as the standard GNU library routines
+**  asprintf and vasprintf for those platforms that don't have them.
+*/
+
+#include <config.h>
+#include <system.h>
+
+/* If we're running the test suite, rename the functions to avoid conflicts
+   with the system versions. */
+#if TESTING
+# define asprintf test_asprintf
+# define vasprintf test_vasprintf
+int test_asprintf(char **, const char *, ...);
+int test_vasprintf(char **, const char *, va_list);
+#endif
+
+int
+asprintf(char **strp, const char *fmt, ...)
+{
+    va_list args;
+    int status;
+
+    va_start(args, fmt);
+    status = vasprintf(strp, fmt, args);
+    va_end(args);
+    return status;
+}
+
+int
+vasprintf(char **strp, const char *fmt, va_list args)
+{
+    va_list args_copy;
+    int status, needed;
+
+    va_copy(args_copy, args);
+    needed = vsnprintf(NULL, 0, fmt, args_copy);
+    va_end(args_copy);
+    if (needed < 0) {
+        *strp = NULL;
+        return needed;
+    }
+    *strp = malloc(needed + 1);
+    if (*strp == NULL)
+        return -1;
+    status = vsnprintf(*strp, needed + 1, fmt, args);
+    if (status >= 0)
+        return status;
+    else {
+        free(*strp);
+        *strp = NULL;
+        return status;
+    }
+}