printf-hook-builtin: Don't rely on isinf() return value signedness

Many systems don't return a negative value for negative infinities; so do
a separate check.

diff --git a/src/libstrongswan/utils/printf_hook/printf_hook_builtin.c b/src/libstrongswan/utils/printf_hook/printf_hook_builtin.c
index ec0a418d81c5e3444b1b3695a5a594d5269ca464..d00abef20289416ffc92a37e077201d7615169d6 100644 (file)
--- a/src/libstrongswan/utils/printf_hook/printf_hook_builtin.c
+++ b/src/libstrongswan/utils/printf_hook/printf_hook_builtin.c
@@ -926,15 +926,16 @@ int builtin_vsnprintf(char *buffer, size_t n, const char *format, va_list ap)
                                                                double dval;
 
                                                                dval = va_arg(ap, double);
-                                                               if (isinf(dval) == 1)
+                                                               if (isinf(dval))
                                                                {
-                                                                       sarg = flags & FL_UPPER ? "INF" : "inf";
-                                                                       slen = strlen(sarg);
-                                                                       goto is_string;
-                                                               }
-                                                               if (isinf(dval) == -1)
-                                                               {
-                                                                       sarg = flags & FL_UPPER ? "-INF" : "-inf";
+                                                                       if (isgreater(dval, 0.0))
+                                                                       {
+                                                                               sarg = flags & FL_UPPER ? "INF" : "inf";
+                                                                       }
+                                                                       else
+                                                                       {
+                                                                               sarg = flags & FL_UPPER ? "-INF" : "-inf";
+                                                                       }
                                                                        slen = strlen(sarg);
                                                                        goto is_string;
                                                                }