Add vasprintf/asprintf2.3

The only hardening being done here is to set the char** parameter to thos
functions to NULL in case of an error, to prevent it from being used should
people forget to check return values. This is already done on some BSD, as well
as in Rocky Linux.

3 files changed, 61 insertions, 3 deletions

diff --git a/tests/Makefile b/tests/Makefile
index c18898e..32b17b0 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,4 +1,4 @@
-CFLAGS+=-I../include/ -D_FORTIFY_SOURCE=3 -static -O2 -DPEDANTIC_CHECKS
+CFLAGS+=-I../include/ -D_FORTIFY_SOURCE=3 -static -O2 -DPEDANTIC_CHECKS -Wno-format
 
 COMPTIME_TARGETS= \
         test_memcpy_overwrite_under  \
@@ -12,6 +12,7 @@ RUNTIME_TARGETS= \
         test_FD_SET_negative         \
         test_FD_ISSET_SETSIZE        \
         test_FD_ISSET_negative       \
+        test_asprintf                \
         test_bcopy_dynamic_read      \
         test_bcopy_dynamic_write     \
         test_bcopy_static_read       \
@@ -126,11 +127,12 @@ RUNTIME_TARGETS= \
         test_ttyname_r_dynamic       \
         test_ttyname_r_static        \
         test_umask                   \
+        test_vasprintf               \
+        test_vfprintf                \
+        test_vprintf                 \
         test_vsnprintf_dynamic       \
         test_vsnprintf_static        \
         test_vsprintf                \
-        test_vfprintf                \
-        test_vprintf                 \
         test_wcscat_static_write     \
         test_wcscpy_static_write     \
         test_wcsncat_static_write    \
diff --git a/tests/test_asprintf.c b/tests/test_asprintf.c
new file mode 100644
index 0000000..a02d110
--- /dev/null
+++ b/tests/test_asprintf.c
@@ -0,0 +1,20 @@
+#define _GNU_SOURCE
+#include "common.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char** argv) {
+    char* buf;
+    asprintf(&buf, "total: %d+%d=%d", 1, 2, 3);
+    puts(buf);
+    free(buf);
+
+#ifndef __clang__
+    asprintf(&buf, "total: %", 1);
+    assert(buf == NULL);
+#endif
+
+    return 0;
+}
diff --git a/tests/test_vasprintf.c b/tests/test_vasprintf.c
new file mode 100644
index 0000000..2f71714
--- /dev/null
+++ b/tests/test_vasprintf.c
@@ -0,0 +1,36 @@
+#define _GNU_SOURCE
+#include "common.h"
+
+#include <assert.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void test(const char *fmt, ...)
+{
+    char* buf;
+    va_list args;
+    va_start(args, fmt);
+    vasprintf(&buf, fmt, args);
+    va_end(args);
+    puts(buf);
+    free(buf);
+}
+
+void test2(const char *fmt, ...)
+{
+    char* buf;
+    va_list args;
+    va_start(args, fmt);
+    vasprintf(&buf, fmt, args);
+    va_end(args);
+    assert(buf == NULL);
+}
+
+int main(int argc, char** argv) {
+    test("Total: %d+%d=%d", 1, 2, 3);
+#ifndef __clang__
+    test2("Total: %", 1, 2, 3);
+#endif
+    return 0;
+}