stop using big static buffer for inode hash

3 files changed, 48 insertions, 43 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 759eb8d15..632ed937d 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -229,6 +229,7 @@ extern void trim(char *s);
 extern char *skip_whitespace(const char *);
 extern char *skip_non_whitespace(const char *);
 
+//TODO: supply a pointer to char[11] buffer (avoid statics)?
 extern const char *bb_mode_string(mode_t mode);
 extern int is_directory(const char *name, int followLinks, struct stat *statBuf);
 extern int remove_file(const char *path, int flags);
@@ -556,9 +557,11 @@ extern int del_loop(const char *device);
 extern int set_loop(char **device, const char *file, unsigned long long offset);
 
 
+//TODO: provide pointer to buf (avoid statics)?
 const char *make_human_readable_str(unsigned long long size,
                 unsigned long block_size, unsigned long display_unit);
 
+//TODO: pass buf pointer or return allocated buf (avoid statics)?
 char *bb_askpass(int timeout, const char * prompt);
 int bb_ask_confirmation(void);
 int klogctl(int type, char * b, int len);
@@ -624,7 +627,7 @@ extern void vfork_daemon_rexec(int nochdir, int noclose,
 #endif
 extern int get_terminal_width_height(const int fd, int *width, int *height);
 
-int is_in_ino_dev_hashtable(const struct stat *statbuf, char **name);
+char *is_in_ino_dev_hashtable(const struct stat *statbuf);
 void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name);
 void reset_ino_dev_hashtable(void);
 #ifdef __GLIBC__
diff --git a/libbb/copy_file.c b/libbb/copy_file.c
index 07564afd0..636fbdc1d 100644
--- a/libbb/copy_file.c
+++ b/libbb/copy_file.c
@@ -172,22 +172,21 @@ int copy_file(const char *source, const char *dest, int flags)
                 if (ENABLE_FEATURE_PRESERVE_HARDLINKS) {
                         char *link_name;
 
-                        if (!FLAGS_DEREF
-                         && is_in_ino_dev_hashtable(&source_stat, &link_name)
-                        ) {
-                                if (link(link_name, dest) < 0) {
-                                        ovr = retry_overwrite(dest, flags);
-                                        if (ovr <= 0)
-                                                return ovr;
+                        if (!FLAGS_DEREF) {
+                                link_name = is_in_ino_dev_hashtable(&source_stat);
+                                if (link_name) {
                                         if (link(link_name, dest) < 0) {
-                                                bb_perror_msg("cannot create link '%s'", dest);
-                                                return -1;
+                                                ovr = retry_overwrite(dest, flags);
+                                                if (ovr <= 0)
+                                                        return ovr;
+                                                if (link(link_name, dest) < 0) {
+                                                        bb_perror_msg("cannot create link '%s'", dest);
+                                                        return -1;
+                                                }
                                         }
+                                        return 0;
                                 }
-                                return 0;
                         }
-                        // TODO: probably is_in_.. and add_to_...
-                        // can be combined: find_or_add_...
                         add_to_ino_dev_hashtable(&source_stat, dest);
                 }
 
diff --git a/libbb/inode_hash.c b/libbb/inode_hash.c
index 2ac1623f4..55a7564ce 100644
--- a/libbb/inode_hash.c
+++ b/libbb/inode_hash.c
@@ -13,41 +13,40 @@
 #include <string.h>
 #include "libbb.h"
 
-#define HASH_SIZE       311             /* Should be prime */
-#define hash_inode(i)   ((i) % HASH_SIZE)
-
 typedef struct ino_dev_hash_bucket_struct {
-  struct ino_dev_hash_bucket_struct *next;
-  ino_t ino;
-  dev_t dev;
-  char name[1];
+        struct ino_dev_hash_bucket_struct *next;
+        ino_t ino;
+        dev_t dev;
+        char name[1];
 } ino_dev_hashtable_bucket_t;
 
-static ino_dev_hashtable_bucket_t *ino_dev_hashtable[HASH_SIZE];
+#define HASH_SIZE       311             /* Should be prime */
+#define hash_inode(i)   ((i) % HASH_SIZE)
+
+/* array of [HASH_SIZE] elements */
+static ino_dev_hashtable_bucket_t **ino_dev_hashtable;
 
 /*
- * Return 1 if statbuf->st_ino && statbuf->st_dev are recorded in
- * `ino_dev_hashtable', else return 0
- *
- * If NAME is a non-NULL pointer to a character pointer, and there is
- * a match, then set *NAME to the value of the name slot in that
- * bucket.
+ * Return name if statbuf->st_ino && statbuf->st_dev are recorded in
+ * ino_dev_hashtable, else return NULL
  */
-int is_in_ino_dev_hashtable(const struct stat *statbuf, char **name)
+char *is_in_ino_dev_hashtable(const struct stat *statbuf)
 {
         ino_dev_hashtable_bucket_t *bucket;
 
+        if (!ino_dev_hashtable)
+                return NULL;
+
         bucket = ino_dev_hashtable[hash_inode(statbuf->st_ino)];
         while (bucket != NULL) {
-          if ((bucket->ino == statbuf->st_ino) &&
-                  (bucket->dev == statbuf->st_dev))
-          {
-                if (name) *name = bucket->name;
-                return 1;
-          }
-          bucket = bucket->next;
+                if ((bucket->ino == statbuf->st_ino)
+                 && (bucket->dev == statbuf->st_dev)
+                ) {
+                        return bucket->name;
+                }
+                bucket = bucket->next;
         }
-        return 0;
+        return NULL;
 }
 
 /* Add statbuf to statbuf hash table */
@@ -58,19 +57,21 @@ void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name)
         ino_dev_hashtable_bucket_t *bucket;
 
         i = hash_inode(statbuf->st_ino);
-        s = name ? strlen(name) : 0;
-        bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + s);
+        if (!name)
+                name = "";
+        bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + strlen(name));
         bucket->ino = statbuf->st_ino;
         bucket->dev = statbuf->st_dev;
-        if (name)
-                strcpy(bucket->name, name);
-        else
-                bucket->name[0] = '\0';
+        strcpy(bucket->name, name);
+
+        if (!ino_dev_hashtable)
+                ino_dev_hashtable = xzalloc(HASH_SIZE * sizeof(*ino_dev_hashtable));
+
         bucket->next = ino_dev_hashtable[i];
         ino_dev_hashtable[i] = bucket;
 }
 
-#ifdef CONFIG_FEATURE_CLEAN_UP
+#if ENABLE_FEATURE_CLEAN_UP
 /* Clear statbuf hash table */
 void reset_ino_dev_hashtable(void)
 {
@@ -84,5 +85,7 @@ void reset_ino_dev_hashtable(void)
                         ino_dev_hashtable[i] = bucket;
                 }
         }
+        free(ino_dev_hashtable);
+        ino_dev_hashtable = NULL;
 }
 #endif