More constness in C variables

Use 'const' where possible, to avoid accidentally changing read-only
variables.

diff --git a/augeas-c.c b/augeas-c.c
index 3952910..f4396cb 100644 (file)
--- a/augeas-c.c
+++ b/augeas-c.c
@@ -102,7 +102,7 @@ raise_init_error (const char *msg)
 }
 
 /* Map OCaml flags to C flags. */
-static int flag_map[] = {
+static const int flag_map[] = {
   /* AugSaveBackup */  AUG_SAVE_BACKUP,
   /* AugSaveNewFile */ AUG_SAVE_NEWFILE,
   /* AugTypeCheck */   AUG_TYPE_CHECK,
@@ -154,8 +154,8 @@ CAMLprim value
 ocaml_augeas_create (value rootv, value loadpathv, value flagsv)
 {
   CAMLparam1 (rootv);
-  char *root = String_val (rootv);
-  char *loadpath;
+  const char *root = String_val (rootv);
+  const char *loadpath;
   int flags = 0, i;
   augeas_t t;
 
@@ -201,7 +201,7 @@ ocaml_augeas_get (value tv, value pathv)
   CAMLparam2 (tv, pathv);
   CAMLlocal2 (optv, v);
   augeas_t t = Augeas_t_val (tv);
-  char *path = String_val (pathv);
+  const char *path = String_val (pathv);
   const char *val;
   int r;
 
@@ -227,7 +227,7 @@ ocaml_augeas_exists (value tv, value pathv)
   CAMLparam2 (tv, pathv);
   CAMLlocal1 (v);
   augeas_t t = Augeas_t_val (tv);
-  char *path = String_val (pathv);
+  const char *path = String_val (pathv);
   int r;
 
   r = aug_get (t, path, NULL);
@@ -249,8 +249,8 @@ ocaml_augeas_insert (value tv, value beforev, value pathv, value labelv)
 {
   CAMLparam4 (tv, beforev, pathv, labelv);
   augeas_t t = Augeas_t_val (tv);
-  char *path = String_val (pathv);
-  char *label = String_val (labelv);
+  const char *path = String_val (pathv);
+  const char *label = String_val (labelv);
   int before;
 
   before = beforev == Val_int (0) ? 0 : Int_val (Field (beforev, 0));
@@ -267,7 +267,7 @@ ocaml_augeas_rm (value tv, value pathv)
 {
   CAMLparam2 (tv, pathv);
   augeas_t t = Augeas_t_val (tv);
-  char *path = String_val (pathv);
+  const char *path = String_val (pathv);
   int r;
 
   r = aug_rm (t, path);
@@ -284,7 +284,7 @@ ocaml_augeas_match (value tv, value pathv)
   CAMLparam2 (tv, pathv);
   CAMLlocal3 (rv, v, cons);
   augeas_t t = Augeas_t_val (tv);
-  char *path = String_val (pathv);
+  const char *path = String_val (pathv);
   char **matches;
   int r, i;
 
@@ -314,7 +314,7 @@ ocaml_augeas_count_matches (value tv, value pathv)
 {
   CAMLparam2 (tv, pathv);
   augeas_t t = Augeas_t_val (tv);
-  char *path = String_val (pathv);
+  const char *path = String_val (pathv);
   int r;
 
   r = aug_match (t, path, NULL);