thodg/libgit2/src/ident.c

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• Hash : 0c7f49dd
  Author :
  Date : 2017-06-30T13:39:01
  

  Make sure to always include "common.h" first
  
  Next to including several files, our "common.h" header also declares
  various macros which are then used throughout the project. As such, we
  have to make sure to always include this file first in all
  implementation files. Otherwise, we might encounter problems or even
  silent behavioural differences due to macros or defines not being
  defined as they should be. So in fact, our header and implementation
  files should make sure to always include "common.h" first.
  
  This commit does so by establishing a common include pattern. Header
  files inside of "src" will now always include "common.h" as its first
  other file, separated by a newline from all the other includes to make
  it stand out as special. There are two cases for the implementation
  files. If they do have a matching header file, they will always include
  this one first, leading to "common.h" being transitively included as
  first file. If they do not have a matching header file, they instead
  include "common.h" as first file themselves.
  
  This fixes the outlined problems and will become our standard practice
  for header and source files inside of the "src/" from now on.
  

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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 "common.h"
  
  #include "git2/sys/filter.h"
  #include "filter.h"
  #include "buffer.h"
  #include "buf_text.h"
  
  static int ident_find_id(
  	const char **id_start, const char **id_end, const char *start, size_t len)
  {
  	const char *end = start + len, *found = NULL;
  
  	while (len > 3 && (found = memchr(start, '$', len)) != NULL) {
  		size_t remaining = (size_t)(end - found) - 1;
  		if (remaining < 3)
  			return GIT_ENOTFOUND;
  
  		start = found + 1;
  		len   = remaining;
  
  		if (start[0] == 'I' && start[1] == 'd')
  			break;
  	}
  
  	if (len < 3 || !found)
  		return GIT_ENOTFOUND;
  	*id_start = found;
  
  	if ((found = memchr(start + 2, '$', len - 2)) == 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_PASSTHROUGH;
  
  	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_PASSTHROUGH;
  
  	need_size = (size_t)(id_start - from->ptr) +
  		5 /* "$Id: " */ + GIT_OID_HEXSZ + 2 /* " $" */ +
  		(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_put(to, " $", 2);
  	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_PASSTHROUGH;
  
  	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);
  
  	/* Don't filter binary files */
  	if (git_buf_text_is_binary(from))
  		return GIT_PASSTHROUGH;
  
  	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));
  	if (f == NULL)
  		return NULL;
  
  	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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