some portability improvements

Author: JeffBezanson

dirpath.c

@@ -79,6 +79,21 @@ char *get_exename(char *buf, size_t size)
 
     return buf;
 }
+#elif defined(__FreeBSD__)
+#include <sys/types.h>
+#include <sys/sysctl.h>
+
+char *get_exename(char *buf, size_t size)
+{
+  int mib[4];
+  mib[0] = CTL_KERN;
+  mib[1] = KERN_PROC;
+  mib[2] = KERN_PROC_PATHNAME;
+  mib[3] = -1;
+  sysctl(mib, 4, buf, &size, NULL, 0);
+ 
+  return buf;
+}
 #elif defined(WIN32)
 char *get_exename(char *buf, size_t size)
 {

utf8.c

@@ -24,7 +24,9 @@
 #include <malloc.h>
 #define snprintf _snprintf
 #else
+#ifndef __FreeBSD__
 #include <alloca.h>
+#endif /* __FreeBSD__ */
 #endif
 #include <assert.h>