Further corrections to the logging layer in runtime.

Author: graydon

src/rt/rust_internal.h

@@ -90,7 +90,7 @@ static intptr_t const CONST_REFCOUNT = 0x7badface;
 
 // This accounts for logging buffers.
 
-static size_t const BUF_BYTES = 1024;
+static size_t const BUF_BYTES = 2048;
 
 // Every reference counted object should derive from this base class.
 

src/rt/rust_kernel.cpp

@@ -119,7 +119,7 @@ rust_kernel::is_deadlocked() {
 
 void
 rust_kernel::log(uint32_t type_bits, char const *fmt, ...) {
-    char buf[256];
+    char buf[BUF_BYTES];
     if (_log.is_tracing(type_bits)) {
         va_list args;
         va_start(args, fmt);

src/rt/rust_log.cpp

@@ -114,7 +114,8 @@ append_string(char *buffer, const char *format, ...) {
     if (buffer != NULL && format) {
         va_list args;
         va_start(args, format);
-        vsprintf(buffer + strlen(buffer), format, args);
+        size_t off = strlen(buffer);
+        vsnprintf(buffer + off, BUF_BYTES - off, format, args);
         va_end(args);
     }
     return buffer;
@@ -127,7 +128,8 @@ append_string(char *buffer, rust_log::ansi_color color,
         append_string(buffer, "\x1b%s", _foreground_colors[color]);
         va_list args;
         va_start(args, format);
-        vsprintf(buffer + strlen(buffer), format, args);
+        size_t off = strlen(buffer);
+        vsnprintf(buffer + off, BUF_BYTES - off, format, args);
         va_end(args);
         append_string(buffer, "\x1b[0m");
     }
@@ -193,7 +195,7 @@ rust_log::trace_ln(rust_task *task, ansi_color color,
                    uint32_t type_bits, char *message) {
     if (is_tracing(type_bits)) {
         if (_use_colors) {
-            char buffer[512] = "";
+            char buffer[BUF_BYTES] = "";
             append_string(buffer, color, "%s", message);
             trace_ln(task, buffer);
         } else {

src/rt/rust_task.cpp

@@ -631,7 +631,7 @@ rust_task::get_crate_cache(rust_crate const *curr_crate)
 
 void
 rust_task::log(uint32_t type_bits, char const *fmt, ...) {
-    char buf[256];
+    char buf[BUF_BYTES];
     if (dom->get_log().is_tracing(type_bits)) {
         va_list args;
         va_start(args, fmt);