4 files changed, 119 insertions, 0 deletions
diff --git a/contrib/ccan/asprintf/LICENSE b/contrib/ccan/asprintf/LICENSE
new file mode 120000
index 0000000..2354d12
--- /dev/null
+++ b/contrib/ccan/asprintf/LICENSE
@@ -0,0 +1 @@
+../../licenses/BSD-MIT
+\ No newline at end of file
diff --git a/contrib/ccan/asprintf/asprintf.c b/contrib/ccan/asprintf/asprintf.c
new file mode 100644
index 0000000..4077599
--- /dev/null
+++ b/contrib/ccan/asprintf/asprintf.c
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: MIT
+ * Source: https://ccodearchive.net/info/asprintf.html */
+#include <ccan/asprintf/asprintf.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+char *PRINTF_FMT(1, 2) afmt(const char *fmt, ...)
+{
+	va_list ap;
+	char *ptr;
+
+	va_start(ap, fmt);
+	/* The BSD version apparently sets ptr to NULL on fail.  GNU loses. */
+	if (vasprintf(&ptr, fmt, ap) < 0)
+		ptr = NULL;
+	va_end(ap);
+	return ptr;
+}
+
+#if !HAVE_ASPRINTF
+#include <stdarg.h>
+#include <stdlib.h>
+
+int vasprintf(char **strp, const char *fmt, va_list ap)
+{
+	int len;
+	va_list ap_copy;
+
+	/* We need to make a copy of ap, since it's a use-once. */
+	va_copy(ap_copy, ap);
+	len = vsnprintf(NULL, 0, fmt, ap_copy);
+	va_end(ap_copy);
+
+	/* Until version 2.0.6 glibc would return -1 on truncated output.
+	 * OTOH, they had asprintf. */
+	if (len < 0)
+		return -1;
+
+	*strp = malloc(len+1);
+	if (!*strp)
+		return -1;
+
+	return vsprintf(*strp, fmt, ap);
+}
+
+int asprintf(char **strp, const char *fmt, ...)
+{
+	va_list ap;
+	int len;
+
+	va_start(ap, fmt);
+	len = vasprintf(strp, fmt, ap);
+	va_end(ap);
+
+	return len;
+}
+#endif /* !HAVE_ASPRINTF */
diff --git a/contrib/ccan/asprintf/asprintf.h b/contrib/ccan/asprintf/asprintf.h
new file mode 100644
index 0000000..d4cc5ca
--- /dev/null
+++ b/contrib/ccan/asprintf/asprintf.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: MIT
+ * Source: https://ccodearchive.net/info/asprintf.html */
+#ifndef CCAN_ASPRINTF_H
+#define CCAN_ASPRINTF_H
+#include "config.h"
+#include <ccan/compiler/compiler.h>
+
+/**
+ * afmt - allocate and populate a string with the given format.
+ * @fmt: printf-style format.
+ *
+ * This is a simplified asprintf interface.  Returns NULL on error.
+ */
+char *PRINTF_FMT(1, 2) afmt(const char *fmt, ...);
+
+#if HAVE_ASPRINTF
+#include <stdio.h>
+#else
+#include <stdarg.h>
+/**
+ * asprintf - printf to a dynamically-allocated string.
+ * @strp: pointer to the string to allocate.
+ * @fmt: printf-style format.
+ *
+ * Returns -1 (and leaves @strp undefined) on an error.  Otherwise returns
+ * number of bytes printed into @strp.
+ *
+ * Example:
+ *	static char *greeting(const char *name)
+ *	{
+ *		char *str;
+ *		int len = asprintf(&str, "Hello %s", name);
+ *		if (len < 0)
+ *			return NULL;
+ *		return str;
+ *	}
+ */
+int PRINTF_FMT(2, 3) asprintf(char **strp, const char *fmt, ...);
+
+/**
+ * vasprintf - vprintf to a dynamically-allocated string.
+ * @strp: pointer to the string to allocate.
+ * @fmt: printf-style format.
+ *
+ * Returns -1 (and leaves @strp undefined) on an error.  Otherwise returns
+ * number of bytes printed into @strp.
+ */
+int vasprintf(char **strp, const char *fmt, va_list ap);
+#endif
+
+#endif /* CCAN_ASPRINTF_H */
diff --git a/contrib/ccan/asprintf/asprintf.spdx b/contrib/ccan/asprintf/asprintf.spdx
new file mode 100644
index 0000000..175078a
--- /dev/null
+++ b/contrib/ccan/asprintf/asprintf.spdx
@@ -0,0 +1,10 @@
+SPDXVersion: SPDX-2.1
+DataLicense: CC0-1.0
+SPDXID: SPDXRef-DOCUMENT
+DocumentName: ccan-asprintf
+DocumentNamespace: http://spdx.org/spdxdocs/spdx-v2.1-40d4b71d-00e9-4e75-b6da-559203e6b815
+
+PackageName: asprintf
+PackageDownloadLocation: git+https://github.com/rustyrussell/ccan@fb1dfd092940905883ea6473162f5f6e36624da2#ccan/asprintf
+PackageOriginator: Person: Rusty Russell (rusty@rustcorp.com.au)
+PackageLicenseDeclared: MIT