maint: avoid more gcc warnings: apply _GL_ATTRIBUTE_PURE

* sed/utils.h (get_buffer, size_buffer): Make each functions
sole parameter "const" and declare the function itself with the
"pure" attribute.
* sed/utils.c (get_buffer, size_buffer): Adjust definitions to match.

2 files changed, 5 insertions, 5 deletions

diff --git a/sed/utils.c b/sed/utils.c
index ec9b2e6..f8fa031 100644
--- a/sed/utils.c
+++ b/sed/utils.c
@@ -81,7 +81,7 @@ panic(const char *str, ...)
 
 
 /* Internal routine to get a filename from open_files */
-static const char *
+static const char * _GL_ATTRIBUTE_PURE
 utils_fp_name(FILE *fp)
 {
   struct open_file *p;
@@ -477,13 +477,13 @@ init_buffer(void)
 }
 
 char *
-get_buffer(struct buffer *b)
+get_buffer(struct buffer const *b)
 {
   return b->b;
 }
 
 size_t
-size_buffer(struct buffer *b)
+size_buffer(struct buffer const *b)
 {
   return b->length;
 }
diff --git a/sed/utils.h b/sed/utils.h
index 9387369..0ce5005 100644
--- a/sed/utils.h
+++ b/sed/utils.h
@@ -41,8 +41,8 @@ char *ck_strdup (const char *str);
 void *ck_memdup (const void *buf, size_t len);
 
 struct buffer *init_buffer (void);
-char *get_buffer (struct buffer *b);
-size_t size_buffer (struct buffer *b);
+char *get_buffer (struct buffer const *b) _GL_ATTRIBUTE_PURE;
+size_t size_buffer (struct buffer const *b) _GL_ATTRIBUTE_PURE;
 char *add_buffer (struct buffer *b, const char *p, size_t n);
 char *add1_buffer (struct buffer *b, int ch);
 void free_buffer (struct buffer *b);