builtin/apply: move 'symlink_changes' global into 'struct apply_state'

To libify the apply functionality the 'symlink_changes' variable should
not be static and global to the file. Let's move it into
'struct apply_state'.

Reviewed-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/apply.c b/builtin/apply.c
index 47622bee6979f51b1f8bb3c4cfdf9960ba38d434..980bb345222993ce7437a5ed645a5d1c6a2a0751 100644 (file)
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -34,6 +34,20 @@ enum ws_ignore {
        ignore_ws_change
 };
 
+/*
+ * We need to keep track of how symlinks in the preimage are
+ * manipulated by the patches.  A patch to add a/b/c where a/b
+ * is a symlink should not be allowed to affect the directory
+ * the symlink points at, but if the same patch removes a/b,
+ * it is perfectly fine, as the patch removes a/b to make room
+ * to create a directory a/b so that a/b/c can be created.
+ *
+ * See also "struct string_list symlink_changes" in "struct
+ * apply_state".
+ */
+#define SYMLINK_GOES_AWAY 01
+#define SYMLINK_IN_RESULT 02
+
 struct apply_state {
        const char *prefix;
        int prefix_length;
@@ -75,6 +89,7 @@ struct apply_state {
 
        /* Various "current state" */
        int linenr; /* current line number */
+       struct string_list symlink_changes; /* we have to track symlinks */
 
        /*
         * For "diff-stat" like behaviour, we keep track of the biggest change
@@ -3702,52 +3717,42 @@ static int check_to_create(struct apply_state *state,
        return 0;
 }
 
-/*
- * We need to keep track of how symlinks in the preimage are
- * manipulated by the patches.  A patch to add a/b/c where a/b
- * is a symlink should not be allowed to affect the directory
- * the symlink points at, but if the same patch removes a/b,
- * it is perfectly fine, as the patch removes a/b to make room
- * to create a directory a/b so that a/b/c can be created.
- */
-static struct string_list symlink_changes;
-#define SYMLINK_GOES_AWAY 01
-#define SYMLINK_IN_RESULT 02
-
-static uintptr_t register_symlink_changes(const char *path, uintptr_t what)
+static uintptr_t register_symlink_changes(struct apply_state *state,
+                                         const char *path,
+                                         uintptr_t what)
 {
        struct string_list_item *ent;
 
-       ent = string_list_lookup(&symlink_changes, path);
+       ent = string_list_lookup(&state->symlink_changes, path);
        if (!ent) {
-               ent = string_list_insert(&symlink_changes, path);
+               ent = string_list_insert(&state->symlink_changes, path);
                ent->util = (void *)0;
        }
        ent->util = (void *)(what | ((uintptr_t)ent->util));
        return (uintptr_t)ent->util;
 }
 
-static uintptr_t check_symlink_changes(const char *path)
+static uintptr_t check_symlink_changes(struct apply_state *state, const char *path)
 {
        struct string_list_item *ent;
 
-       ent = string_list_lookup(&symlink_changes, path);
+       ent = string_list_lookup(&state->symlink_changes, path);
        if (!ent)
                return 0;
        return (uintptr_t)ent->util;
 }
 
-static void prepare_symlink_changes(struct patch *patch)
+static void prepare_symlink_changes(struct apply_state *state, struct patch *patch)
 {
        for ( ; patch; patch = patch->next) {
                if ((patch->old_name && S_ISLNK(patch->old_mode)) &&
                    (patch->is_rename || patch->is_delete))
                        /* the symlink at patch->old_name is removed */
-                       register_symlink_changes(patch->old_name, SYMLINK_GOES_AWAY);
+                       register_symlink_changes(state, patch->old_name, SYMLINK_GOES_AWAY);
 
                if (patch->new_name && S_ISLNK(patch->new_mode))
                        /* the symlink at patch->new_name is created or remains */
-                       register_symlink_changes(patch->new_name, SYMLINK_IN_RESULT);
+                       register_symlink_changes(state, patch->new_name, SYMLINK_IN_RESULT);
        }
 }
 
@@ -3761,7 +3766,7 @@ static int path_is_beyond_symlink_1(struct apply_state *state, struct strbuf *na
                if (!name->len)
                        break;
                name->buf[name->len] = '\0';
-               change = check_symlink_changes(name->buf);
+               change = check_symlink_changes(state, name->buf);
                if (change & SYMLINK_IN_RESULT)
                        return 1;
                if (change & SYMLINK_GOES_AWAY)
@@ -3930,7 +3935,7 @@ static int check_patch_list(struct apply_state *state, struct patch *patch)
 {
        int err = 0;
 
-       prepare_symlink_changes(patch);
+       prepare_symlink_changes(state, patch);
        prepare_fn_table(state, patch);
        while (patch) {
                if (state->apply_verbosely)
@@ -4668,6 +4673,7 @@ static void init_apply_state(struct apply_state *state, const char *prefix)
 static void clear_apply_state(struct apply_state *state)
 {
        string_list_clear(&state->limit_by_name, 0);
+       string_list_clear(&state->symlink_changes, 0);
        strbuf_release(&state->root);
 
        /* &state->fn_table is cleared at the end of apply_patch() */