From d5f6697f3a592245e8bd12a0ea8dbd24d3129296 Mon Sep 17 00:00:00 2001
From: Romain Vimont <rom@rom1v.com>
Date: Wed, 24 Nov 2021 19:55:00 +0100
Subject: [PATCH] Add (v)asprintf compatibility functions

In case they are not available on the platform.
---
 app/meson.build  |  2 ++
 app/src/compat.c | 36 ++++++++++++++++++++++++++++++++++++
 app/src/compat.h |  8 ++++++++
 3 files changed, 46 insertions(+)

diff --git a/app/meson.build b/app/meson.build
index 32adf18b..1561fdcd 100644
--- a/app/meson.build
+++ b/app/meson.build
@@ -138,6 +138,8 @@ endif
 
 check_functions = [
     'strdup',
+    'asprintf',
+    'vasprintf',
 ]
 
 foreach f : check_functions
diff --git a/app/src/compat.c b/app/src/compat.c
index 4d084517..11ddd3cb 100644
--- a/app/src/compat.c
+++ b/app/src/compat.c
@@ -2,7 +2,10 @@
 
 #include "config.h"
 
+#include <assert.h>
 #include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
 #include <string.h>
 
 #ifndef HAVE_STRDUP
@@ -15,3 +18,36 @@ char *strdup(const char *s) {
     return dup;
 }
 #endif
+
+#ifndef HAVE_ASPRINTF
+int asprintf(char **strp, const char *fmt, ...) {
+    va_list va;
+    va_start(va, fmt);
+    int ret = vasprintf(strp, fmt, va);
+    va_end(va);
+    return ret;
+}
+#endif
+
+#ifndef HAVE_VASPRINTF
+int vasprintf(char **strp, const char *fmt, va_list ap) {
+    va_list va;
+    va_copy(va, ap);
+    int len = vsnprintf(NULL, 0, fmt, va);
+    va_end(va);
+
+    char *str = malloc(len + 1);
+    if (!str) {
+        return -1;
+    }
+
+    va_copy(va, ap);
+    int len2 = vsnprintf(str, len + 1, fmt, va);
+    (void) len2;
+    assert(len == len2);
+    va_end(va);
+
+    *strp = str;
+    return len;
+}
+#endif
diff --git a/app/src/compat.h b/app/src/compat.h
index c06c23fa..3ab56049 100644
--- a/app/src/compat.h
+++ b/app/src/compat.h
@@ -58,4 +58,12 @@
 char *strdup(const char *s);
 #endif
 
+#ifndef HAVE_ASPRINTF
+int asprintf(char **strp, const char *fmt, ...);
+#endif
+
+#ifndef HAVE_VASPRINTF
+int vasprintf(char **strp, const char *fmt, va_list ap);
+#endif
+
 #endif