add comments

git-svn-id: https://svn.r-project.org/R/trunk@87927 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: ripley

src/main/Rdynload.c

@@ -278,6 +278,7 @@ DllInfo *R_getEmbeddingDllInfo(void)
     return dll;
 }
 
+// API, in header R_ext/Rdynload.h
 Rboolean R_useDynamicSymbols(DllInfo *info, Rboolean value)
 {
     Rboolean old;
@@ -286,6 +287,7 @@ Rboolean R_useDynamicSymbols(DllInfo *info, Rboolean value)
     return old;
 }
 
+// API, in header R_ext/Rdynload.h
 Rboolean R_forceSymbols(DllInfo *info, Rboolean value)
 {
     Rboolean old;

src/main/util.c

@@ -448,7 +448,7 @@ size_t mbcsToUcs2(const char *in, R_ucs2_t *out, int nout, int enc)
 
 #include <wctype.h>
 
-/* This one is not in Rinternals.h, but is used in internet module */
+// non-API put used in the internet module and in packages
 Rboolean isBlankString(const char *s)
 {
     if(mbcslocale) {
@@ -473,6 +473,7 @@ Rboolean StringBlank(SEXP x)
 
 /* Function to test whether a string is a true value */
 
+// non-API but used in packages
 Rboolean StringTrue(const char *name)
 {
     int i;
@@ -482,6 +483,7 @@ Rboolean StringTrue(const char *name)
     return FALSE;
 }
 
+// non-API but used in packages
 Rboolean StringFalse(const char *name)
 {
     int i;