Add doc to OS::StrNCpy

src/platform.h

Index: src/platform.h
diff --git a/src/platform.h b/src/platform.h
index 75e557cb443c0ff87228188c3c92c7fb8b358057..24cb1bdfefd3cb064a3cadbf836981346a3a1b67 100644
--- a/src/platform.h
+++ b/src/platform.h
@@ -240,6 +240,11 @@ class OS {
                        va_list args);
 
   static char* StrChr(char* str, int c);
+
+  // Calls strncpy in POSIX and strncpy_s in Windows. It means that

[Mads Ager (chromium), 2010/01/19 16:07:06]

I think it would make more sense to change the implementation of StrNCpy to work
the same on all platforms.  Why don't we change StrNCpy to always null terminate
and document this consistent behavior instead?

[Søren Thygesen Gjesse, 2010/01/19 16:13:06]

Then we should probably stick to the strncpy_s semantics where the dest[0] is
set to '\0' if dest does not have room for the n characters.

+  // depending on platform it may or may not set terminating 0 and
+  // it may or may not check length of dest buffer (dest must fit
+  // n bytes plus 1 terminating byte).
   static void StrNCpy(Vector<char> dest, const char* src, size_t n);
 
   // Support for profiler.  Can do nothing, in which case ticks