Update tutorial.

diff --git a/read-cache.c b/read-cache.c
index 9b6ce46b9fa57e85b5c9e6bf552dc27f40f6e5c5..ced597318e783ab08b73c88f8b724be51f3b3dec 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -171,6 +171,32 @@ int ce_same_name(struct cache_entry *a, struct cache_entry *b)
        return ce_namelen(b) == len && !memcmp(a->name, b->name, len);
 }
 
+int ce_path_match(const struct cache_entry *ce, const char **pathspec)
+{
+       const char *match, *name;
+       int len;
+
+       if (!pathspec)
+               return 1;
+
+       len = ce_namelen(ce);
+       name = ce->name;
+       while ((match = *pathspec++) != NULL) {
+               int matchlen = strlen(match);
+               if (matchlen > len)
+                       continue;
+               if (memcmp(name, match, matchlen))
+                       continue;
+               if (matchlen && name[matchlen-1] == '/')
+                       return 1;
+               if (name[matchlen] == '/' || !name[matchlen])
+                       return 1;
+               if (!matchlen)
+                       return 1;
+       }
+       return 0;
+}
+
 /*
  * Do we have another file that has the beginning components being a
  * proper superset of the name we're trying to add?
@@ -179,6 +205,7 @@ static int has_file_name(const struct cache_entry *ce, int pos, int ok_to_replac
 {
        int retval = 0;
        int len = ce_namelen(ce);
+       int stage = ce_stage(ce);
        const char *name = ce->name;
 
        while (pos < active_nr) {
@@ -188,6 +215,8 @@ static int has_file_name(const struct cache_entry *ce, int pos, int ok_to_replac
                        break;
                if (memcmp(name, p->name, len))
                        break;
+               if (ce_stage(p) != stage)
+                       continue;
                if (p->name[len] != '/')
                        continue;
                retval = -1;
@@ -205,6 +234,7 @@ static int has_file_name(const struct cache_entry *ce, int pos, int ok_to_replac
 static int has_dir_name(const struct cache_entry *ce, int pos, int ok_to_replace)
 {
        int retval = 0;
+       int stage = ce_stage(ce);
        const char *name = ce->name;
        const char *slash = name + ce_namelen(ce);
 
@@ -219,7 +249,7 @@ static int has_dir_name(const struct cache_entry *ce, int pos, int ok_to_replace
                }
                len = slash - name;
 
-               pos = cache_name_pos(name, len);
+               pos = cache_name_pos(name, ntohs(create_ce_flags(len, stage)));
                if (pos >= 0) {
                        retval = -1;
                        if (ok_to_replace)
@@ -231,18 +261,23 @@ static int has_dir_name(const struct cache_entry *ce, int pos, int ok_to_replace
                /*
                 * Trivial optimization: if we find an entry that
                 * already matches the sub-directory, then we know
-                * we're ok, and we can exit
+                * we're ok, and we can exit.
                 */
                pos = -pos-1;
-               if (pos < active_nr) {
+               while (pos < active_nr) {
                        struct cache_entry *p = active_cache[pos];
-                       if (ce_namelen(p) <= len)
-                               continue;
-                       if (p->name[len] != '/')
-                               continue;
-                       if (memcmp(p->name, name, len))
-                               continue;
-                       break;
+                       if ((ce_namelen(p) <= len) ||
+                           (p->name[len] != '/') ||
+                           memcmp(p->name, name, len))
+                               break; /* not our subdirectory */
+                       if (ce_stage(p) == stage)
+                               /* p is at the same stage as our entry, and
+                                * is a subdirectory of what we are looking
+                                * at, so we cannot have conflicts at our
+                                * level or anything shorter.
+                                */
+                               return retval;
+                       pos++;
                }
        }
        return retval;
@@ -277,6 +312,7 @@ int add_cache_entry(struct cache_entry *ce, int option)
        int pos;
        int ok_to_add = option & ADD_CACHE_OK_TO_ADD;
        int ok_to_replace = option & ADD_CACHE_OK_TO_REPLACE;
+       int skip_df_check = option & ADD_CACHE_SKIP_DFCHECK;
        pos = cache_name_pos(ce->name, ntohs(ce->ce_flags));
 
        /* existing match? Just replace it */
@@ -302,7 +338,7 @@ int add_cache_entry(struct cache_entry *ce, int option)
        if (!ok_to_add)
                return -1;
 
-       if (!ce_stage(ce) && check_file_directory_conflict(ce, pos, ok_to_replace)) {
+       if (!skip_df_check && check_file_directory_conflict(ce, pos, ok_to_replace)) {
                if (!ok_to_replace)
                        return -1;
                pos = cache_name_pos(ce->name, ntohs(ce->ce_flags));
@@ -358,7 +394,7 @@ int read_cache(void)
                return (errno == ENOENT) ? 0 : error("open failed");
 
        size = 0; // avoid gcc warning
-       map = (void *)-1;
+       map = MAP_FAILED;
        if (!fstat(fd, &st)) {
                size = st.st_size;
                errno = EINVAL;
@@ -366,7 +402,7 @@ int read_cache(void)
                        map = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
        }
        close(fd);
-       if (-1 == (int)(long)map)
+       if (map == MAP_FAILED)
                return error("mmap failed");
 
        hdr = map;