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-rw-r--r--src/stdio/vasprintf.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/src/stdio/vasprintf.c b/src/stdio/vasprintf.c
new file mode 100644
index 00000000..f2bbc7aa
--- /dev/null
+++ b/src/stdio/vasprintf.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+
+#define GUESS 240U
+
+int vasprintf(char **s, const char *fmt, va_list ap)
+{
+ va_list ap2;
+ char *a;
+ int l=GUESS;
+
+ if (!(a=malloc(GUESS))) return -1;
+
+ va_copy(ap2, ap);
+ l=vsnprintf(a, GUESS, fmt, ap2);
+ va_end(ap2);
+
+ if (l<GUESS) {
+ char *b = realloc(a, l+1U);
+ *s = b ? b : a;
+ return l;
+ }
+ free(a);
+ if (l<0 || !(*s=malloc(l+1U))) return -1;
+ return vsnprintf(*s, l+1U, fmt, ap);
+}