Make explicit which API functions can be consumed

Signed-off-by: Shawn Webb <shawn.webb@hardenedbsd.org>

include/snippets.h

@@ -30,6 +30,8 @@
 
 #include <curl/curl.h>
 
+#define EXPORTED_SYM __attribute__((visibility("default")))
+
 #define LIBSNIPPETS_VERSION		1
 #define	SNIPPET_DEFAULT_FILEPATH	"file.txt"
 

lib/libsnippets/libsnippets.c

@@ -29,6 +29,7 @@
 
 #include "snippets.h"
 
+EXPORTED_SYM
 snippet_ctx_t *
 snippet_ctx_new(void)
 {
@@ -42,6 +43,7 @@ snippet_ctx_new(void)
 	return (ctx);
 }
 
+EXPORTED_SYM
 snippet_t *
 snippet_new(snippet_ctx_t *ctx)
 {
@@ -56,6 +58,7 @@ snippet_new(snippet_ctx_t *ctx)
 	return (snippet);
 }
 
+EXPORTED_SYM
 bool
 snippet_set_title(snippet_t *snip, const char *title)
 {
@@ -65,6 +68,7 @@ snippet_set_title(snippet_t *snip, const char *title)
 	return (snip->s_title != NULL);
 }
 
+EXPORTED_SYM
 bool
 snippet_set_description(snippet_t *snip, const char *description)
 {
@@ -74,6 +78,7 @@ snippet_set_description(snippet_t *snip, const char *description)
 	return (snip->s_description != NULL);
 }
 
+EXPORTED_SYM
 bool
 snippet_set_project(snippet_t *snip, const char *project)
 {
@@ -93,6 +98,7 @@ snippet_set_project(snippet_t *snip, const char *project)
 	return (snip->s_project != NULL);
 }
 
+EXPORTED_SYM
 bool
 snippet_set_visibility(snippet_t *snip, snippet_visibility_t vis)
 {
@@ -101,6 +107,7 @@ snippet_set_visibility(snippet_t *snip, snippet_visibility_t vis)
 	return (true);
 }
 
+EXPORTED_SYM
 bool
 snippet_add_file(snippet_t *snip, snippet_file_t *file)
 {
@@ -110,6 +117,7 @@ snippet_add_file(snippet_t *snip, snippet_file_t *file)
 	return (true);
 }
 
+EXPORTED_SYM
 snippet_file_t *
 snippet_file_new(snippet_t *snip)
 {