options: Use const char pointer where possible

If referenced strings are not modified, use const char pointer.

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>

diff --git a/libarchive/archive_options.c b/libarchive/archive_options.c
index 6190bb8ef7ee3ef89d42c340878a10c06b10b045..24480b97e25de18362437b7be95dc78388e613ce 100644 (file)
--- a/libarchive/archive_options.c
+++ b/libarchive/archive_options.c
@@ -33,7 +33,7 @@
 
 static char *
 parse_option(char **str,
-    char **mod, char **opt, char **val);
+    const char **mod, const char **opt, const char **val);
 
 int
 _archive_set_option(struct archive *a,
@@ -102,8 +102,8 @@ _archive_set_options(struct archive *a, const char *options,
     unsigned int magic, const char *fn, option_handler use_option)
 {
        int allok = 1, anyok = 0, ignore_mod_err = 0, r;
-       char *data;
-       char *s, *mod, *opt, *val;
+       char *data, *s;
+       const char *mod, *opt, *val;
 
        archive_check_magic(a, magic, ARCHIVE_STATE_NEW, fn);
 
@@ -168,10 +168,10 @@ _archive_set_options(struct archive *a, const char *options,
 }
 
 static char *
-parse_option(char **s, char **m, char **o, char **v)
+parse_option(char **s, const char **m, const char **o, const char **v)
 {
-       char *end, *mod, *opt, *val;
-       char *p;
+       const char *mod, *val;
+       char *end, *opt, *p;
 
        end = NULL;
        mod = NULL;