1 files changed, 84 insertions, 0 deletions
diff --git a/portable/asprintf.c b/portable/asprintf.c
new file mode 100644
index 000000000000..0451a03ed190
--- /dev/null
+++ b/portable/asprintf.c
@@ -0,0 +1,84 @@
+/*
+ * Replacement for a missing asprintf and vasprintf.
+ *
+ * Provides the same functionality as the standard GNU library routines
+ * asprintf and vasprintf for those platforms that don't have them.
+ *
+ * The canonical version of this file is maintained in the rra-c-util package,
+ * which can be found at <https://www.eyrie.org/~eagle/software/rra-c-util/>.
+ *
+ * Written by Russ Allbery <eagle@eyrie.org>
+ * Copyright 2006, 2015 Russ Allbery <eagle@eyrie.org>
+ * Copyright 2008-2009, 2011, 2013
+ *     The Board of Trustees of the Leland Stanford Junior University
+ *
+ * Copying and distribution of this file, with or without modification, are
+ * permitted in any medium without royalty provided the copyright notice and
+ * this notice are preserved.  This file is offered as-is, without any
+ * warranty.
+ *
+ * SPDX-License-Identifier: FSFAP
+ */
+
+#include <config.h>
+#include <portable/macros.h>
+#include <portable/system.h>
+
+#include <errno.h>
+
+/*
+ * If we're running the test suite, rename the functions to avoid conflicts
+ * with the system versions.
+ */
+#if TESTING
+#    undef asprintf
+#    undef vasprintf
+#    define asprintf  test_asprintf
+#    define vasprintf test_vasprintf
+int test_asprintf(char **, const char *, ...)
+    __attribute__((__format__(printf, 2, 3)));
+int test_vasprintf(char **, const char *, va_list)
+    __attribute__((__format__(printf, 2, 0)));
+#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, oerrno;
+
+    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 {
+        oerrno = errno;
+        free(*strp);
+        *strp = NULL;
+        errno = oerrno;
+        return status;
+    }
+}