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Revision 3ebbd00cf3c5a7c6f90e2fed8adaf0c5145fb4ac authored by Jim Hill on 31 May 2015, 18:16:45 UTC, committed by Junio C Hamano on 10 August 2015, 19:51:13 UTC 
strbuf_read(): skip unnecessary strbuf_grow() at eof
 
The loop in strbuf_read() uses xread() repeatedly while extending
the strbuf until the call returns zero.  If the buffer is
sufficiently large to begin with, this results in xread()
returning the remainder of the file to the end (returning
non-zero), the loop extending the strbuf, and then making another
call to xread() to have it return zero.

By using read_in_full(), we can tell when the read reached the end
of file: when it returns less than was requested, it's eof.  This
way we can avoid an extra iteration that allocates an extra 8kB
that is never used.

Signed-off-by: Jim Hill <gjthill@gmail.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent 282616c
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tree.h 
#ifndef TREE_H
#define TREE_H

#include "object.h"

extern const char *tree_type;

struct tree {
	struct object object;
	void *buffer;
	unsigned long size;
};

struct tree *lookup_tree(const unsigned char *sha1);

int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size);

int parse_tree(struct tree *tree);
void free_tree_buffer(struct tree *tree);

/* Parses and returns the tree in the given ent, chasing tags and commits. */
struct tree *parse_tree_indirect(const unsigned char *sha1);

#define READ_TREE_RECURSIVE 1
typedef int (*read_tree_fn_t)(const unsigned char *, const char *, int, const char *, unsigned int, int, void *);

extern int read_tree_recursive(struct tree *tree,
			       const char *base, int baselen,
			       int stage, const struct pathspec *pathspec,
			       read_tree_fn_t fn, void *context);

extern int read_tree(struct tree *tree, int stage, struct pathspec *pathspec);

#endif /* TREE_H */
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