do not write null sha1s to on-disk index

diff --git a/grep.h b/grep.h
index a65280026d5dee8ab059bead79f05d6a1111147a..36e49d8255e2952828f367a0e35d4fcb027d9772 100644 (file)
--- a/grep.h
+++ b/grep.h
@@ -8,6 +8,8 @@ typedef int pcre;
 typedef int pcre_extra;
 #endif
 #include "kwset.h"
+#include "thread-utils.h"
+#include "userdiff.h"
 
 enum grep_pat_token {
        GREP_PATTERN,
@@ -126,9 +128,61 @@ extern void append_grep_pattern(struct grep_opt *opt, const char *pat, const cha
 extern void append_header_grep_pattern(struct grep_opt *, enum grep_header_field, const char *);
 extern void compile_grep_patterns(struct grep_opt *opt);
 extern void free_grep_patterns(struct grep_opt *opt);
-extern int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long size);
+extern int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size);
+
+struct grep_source {
+       char *name;
+
+       enum grep_source_type {
+               GREP_SOURCE_SHA1,
+               GREP_SOURCE_FILE,
+               GREP_SOURCE_BUF,
+       } type;
+       void *identifier;
+
+       char *buf;
+       unsigned long size;
+
+       struct userdiff_driver *driver;
+};
+
+void grep_source_init(struct grep_source *gs, enum grep_source_type type,
+                     const char *name, const void *identifier);
+int grep_source_load(struct grep_source *gs);
+void grep_source_clear_data(struct grep_source *gs);
+void grep_source_clear(struct grep_source *gs);
+void grep_source_load_driver(struct grep_source *gs);
+int grep_source_is_binary(struct grep_source *gs);
+
+int grep_source(struct grep_opt *opt, struct grep_source *gs);
 
 extern struct grep_opt *grep_opt_dup(const struct grep_opt *opt);
 extern int grep_threads_ok(const struct grep_opt *opt);
 
+#ifndef NO_PTHREADS
+/*
+ * Mutex used around access to the attributes machinery if
+ * opt->use_threads.  Must be initialized/destroyed by callers!
+ */
+extern int grep_use_locks;
+extern pthread_mutex_t grep_attr_mutex;
+extern pthread_mutex_t grep_read_mutex;
+
+static inline void grep_read_lock(void)
+{
+       if (grep_use_locks)
+               pthread_mutex_lock(&grep_read_mutex);
+}
+
+static inline void grep_read_unlock(void)
+{
+       if (grep_use_locks)
+               pthread_mutex_unlock(&grep_read_mutex);
+}
+
+#else
+#define grep_read_lock()
+#define grep_read_unlock()
+#endif
+
 #endif