Avoid dropping const qualifier in casts

Adjusts casts to void dropping const qualifiers. This helps to avoid
mistakes, e.g. modifying string literals.

Also use size_t for length, similar to the upstream php interfaces.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/sp_config_scanner.h b/src/sp_config_scanner.h
index 71f8f7e..560ea6e 100644
--- a/src/sp_config_scanner.h
+++ b/src/sp_config_scanner.h
@@ -10,9 +10,9 @@ typedef enum {
 } sp_argtype;
 
 typedef struct {
-  char *kw; // keyword points directly to the parsed input text and as such is not null-terminated
+  const char *kw; // keyword points directly to the parsed input text and as such is not null-terminated
   size_t kwlen;
-  char *arg; // optional argument / can be not null terminated
+  const char *arg; // optional argument / can be not null terminated
   size_t arglen;
   sp_argtype argtype;
   long lineno;