Add a tor_asprintf() function, and use it in a couple of places.

asprintf() is a GNU extension that some BSDs have picked up: it does a printf
into a newly allocated chunk of RAM.

Our tor_asprintf() differs from standard asprintf() in that:
  - Like our other malloc functions, it asserts on OOM.
  - It works on windows.
  - It always sets its return-field.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/common/compat.h b/src/common/compat.h
index 554ae8919f..f3e30452bd 100644
--- a/src/common/compat.h
+++ b/src/common/compat.h
@@ -235,6 +235,10 @@ int tor_snprintf(char *str, size_t size, const char *format, ...)
 int tor_vsnprintf(char *str, size_t size, const char *format, va_list args)
   ATTR_NONNULL((1,3));
 
+int tor_asprintf(char **strp, const char *fmt, ...)
+  CHECK_PRINTF(2,3);
+int tor_vasprintf(char **strp, const char *fmt, va_list args);
+
 const void *tor_memmem(const void *haystack, size_t hlen, const void *needle,
                        size_t nlen)  ATTR_PURE ATTR_NONNULL((1,3));
 static const void *tor_memstr(const void *haystack, size_t hlen,