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   1 #ifndef TREE_WALK_H
   2 #define TREE_WALK_H
   3
   4 #include "cache.h"
   5
   6 struct strbuf;
   7
   8 struct name_entry {
   9         struct object_id oid;
  10         const char *path;
  11         int pathlen;
  12         unsigned int mode;
  13 };
  14
  15 struct tree_desc {
  16         const void *buffer;
  17         struct name_entry entry;
  18         unsigned int size;
  19 };
  20
  21 static inline const struct object_id *tree_entry_extract(struct tree_desc *desc, const char **pathp, unsigned int *modep)
  22 {
  23         *pathp = desc->entry.path;
  24         *modep = desc->entry.mode;
  25         return &desc->entry.oid;
  26 }
  27
  28 static inline int tree_entry_len(const struct name_entry *ne)
  29 {
  30         return ne->pathlen;
  31 }
  32
  33 /*
  34  * The _gently versions of these functions warn and return false on a
  35  * corrupt tree entry rather than dying,
  36  */
  37
  38 void update_tree_entry(struct tree_desc *);
  39 int update_tree_entry_gently(struct tree_desc *);
  40 void init_tree_desc(struct tree_desc *desc, const void *buf, unsigned long size);
  41 int init_tree_desc_gently(struct tree_desc *desc, const void *buf, unsigned long size);
  42
  43 /*
  44  * Helper function that does both tree_entry_extract() and update_tree_entry()
  45  * and returns true for success
  46  */
  47 int tree_entry(struct tree_desc *, struct name_entry *);
  48 int tree_entry_gently(struct tree_desc *, struct name_entry *);
  49
  50 void *fill_tree_descriptor(struct tree_desc *desc, const struct object_id *oid);
  51
  52 struct traverse_info;
  53 typedef int (*traverse_callback_t)(int n, unsigned long mask, unsigned long dirmask, struct name_entry *entry, struct traverse_info *);
  54 int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info);
  55
  56 enum follow_symlinks_result {
  57         FOUND = 0, /* This includes out-of-tree links */
  58         MISSING_OBJECT = -1, /* The initial symlink is missing */
  59         DANGLING_SYMLINK = -2, /*
  60                                 * The initial symlink is there, but
  61                                 * (transitively) points to a missing
  62                                 * in-tree file
  63                                 */
  64         SYMLINK_LOOP = -3,
  65         NOT_DIR = -4, /*
  66                        * Somewhere along the symlink chain, a path is
  67                        * requested which contains a file as a
  68                        * non-final element.
  69                        */
  70 };
  71
  72 enum follow_symlinks_result get_tree_entry_follow_symlinks(struct object_id *tree_oid, const char *name, struct object_id *result, struct strbuf *result_path, unsigned *mode);
  73
  74 struct traverse_info {
  75         const char *traverse_path;
  76         struct traverse_info *prev;
  77         struct name_entry name;
  78         int pathlen;
  79         struct pathspec *pathspec;
  80
  81         unsigned long df_conflicts;
  82         traverse_callback_t fn;
  83         void *data;
  84         int show_all_errors;
  85 };
  86
  87 int get_tree_entry(const struct object_id *, const char *, struct object_id *, unsigned *);
  88 extern char *make_traverse_path(char *path, const struct traverse_info *info, const struct name_entry *n);
  89 extern void setup_traverse_info(struct traverse_info *info, const char *base);
  90
  91 static inline int traverse_path_len(const struct traverse_info *info, const struct name_entry *n)
  92 {
  93         return info->pathlen + tree_entry_len(n);
  94 }
  95
  96 /* in general, positive means "kind of interesting" */
  97 enum interesting {
  98         all_entries_not_interesting = -1, /* no, and no subsequent entries will be either */
  99         entry_not_interesting = 0,
 100         entry_interesting = 1,
 101         all_entries_interesting = 2 /* yes, and all subsequent entries will be */
 102 };
 103
 104 extern enum interesting tree_entry_interesting(const struct name_entry *,
 105                                                struct strbuf *, int,
 106                                                const struct pathspec *ps);
 107
 108 #endif