thodg/libgit2/src/ident.c

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• Hash : a9f51e43
  Author :
  Date : 2013-09-11T22:00:36
  

  Merge git_buf and git_buffer This makes the git_buf struct that was used internally into an externally available structure and eliminates the git_buffer. As part of that, some of the special cases that arose with the externally used git_buffer were blended into the git_buf, such as being careful about git_buf objects that may have a NULL ptr and allowing for bufs with a valid ptr and size but zero asize as a way of referring to externally owned data.

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• src/ident.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "git2/sys/filter.h"
  #include "filter.h"
  #include "buffer.h"
  
  static int ident_find_id(
  	const char **id_start, const char **id_end, const char *start, size_t len)
  {
  	const char *found;
  
  	while (len > 0 && (found = memchr(start, '$', len)) != NULL) {
  		size_t remaining = len - (size_t)(found - start);
  		if (remaining < 3)
  			return GIT_ENOTFOUND;
  		if (found[1] == 'I' && found[2] == 'd')
  			break;
  		start = found + 1;
  		len = remaining - 1;
  	}
  
  	if (len < 3)
  		return GIT_ENOTFOUND;
  	*id_start = found;
  
  	if ((found = memchr(found + 3, '$', len - 3)) == NULL)
  		return GIT_ENOTFOUND;
  
  	*id_end = found + 1;
  	return 0;
  }
  
  static int ident_insert_id(
  	git_buf *to, const git_buf *from, const git_filter_source *src)
  {
  	char oid[GIT_OID_HEXSZ+1];
  	const char *id_start, *id_end, *from_end = from->ptr + from->size;
  	size_t need_size;
  
  	/* replace $Id$ with blob id */
  
  	if (!git_filter_source_id(src))
  		return GIT_ENOTFOUND;
  
  	git_oid_tostr(oid, sizeof(oid), git_filter_source_id(src));
  
  	if (ident_find_id(&id_start, &id_end, from->ptr, from->size) < 0)
  		return GIT_ENOTFOUND;
  
  	need_size = (size_t)(id_start - from->ptr) +
  		5 /* "$Id: " */ + GIT_OID_HEXSZ + 1 /* "$" */ +
  		(size_t)(from_end - id_end);
  
  	if (git_buf_grow(to, need_size) < 0)
  		return -1;
  
  	git_buf_set(to, from->ptr, (size_t)(id_start - from->ptr));
  	git_buf_put(to, "$Id: ", 5);
  	git_buf_put(to, oid, GIT_OID_HEXSZ);
  	git_buf_putc(to, '$');
  	git_buf_put(to, id_end, (size_t)(from_end - id_end));
  
  	return git_buf_oom(to) ? -1 : 0;
  }
  
  static int ident_remove_id(
  	git_buf *to, const git_buf *from)
  {
  	const char *id_start, *id_end, *from_end = from->ptr + from->size;
  	size_t need_size;
  
  	if (ident_find_id(&id_start, &id_end, from->ptr, from->size) < 0)
  		return GIT_ENOTFOUND;
  
  	need_size = (size_t)(id_start - from->ptr) +
  		4 /* "$Id$" */ + (size_t)(from_end - id_end);
  
  	if (git_buf_grow(to, need_size) < 0)
  		return -1;
  
  	git_buf_set(to, from->ptr, (size_t)(id_start - from->ptr));
  	git_buf_put(to, "$Id$", 4);
  	git_buf_put(to, id_end, (size_t)(from_end - id_end));
  
  	return git_buf_oom(to) ? -1 : 0;
  }
  
  static int ident_apply(
  	git_filter     *self,
  	void          **payload,
  	git_buf        *to,
  	const git_buf  *from,
  	const git_filter_source *src)
  {
  	GIT_UNUSED(self); GIT_UNUSED(payload);
  
  	if (git_filter_source_mode(src) == GIT_FILTER_SMUDGE)
  		return ident_insert_id(to, from, src);
  	else
  		return ident_remove_id(to, from);
  }
  
  git_filter *git_ident_filter_new(void)
  {
  	git_filter *f = git__calloc(1, sizeof(git_filter));
  
  	f->version = GIT_FILTER_VERSION;
  	f->attributes = "+ident"; /* apply to files with ident attribute set */
  	f->shutdown = git_filter_free;
  	f->apply    = ident_apply;
  
  	return f;
  }
  

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