thodg/libgit2/src/posix.c

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• Hash : 97769280
  Author :
  Date : 2011-11-30T11:27:15
  

  Use git_buf for path storage instead of stack-based buffers
  
  This converts virtually all of the places that allocate GIT_PATH_MAX
  buffers on the stack for manipulating paths to use git_buf objects
  instead.  The patch is pretty careful not to touch the public API
  for libgit2, so there are a few places that still use GIT_PATH_MAX.
  
  This extends and changes some details of the git_buf implementation
  to add a couple of extra functions and to make error handling easier.
  
  This includes serious alterations to all the path.c functions, and
  several of the fileops.c ones, too.  Also, there are a number of new
  functions that parallel existing ones except that use a git_buf
  instead of a stack-based buffer (such as git_config_find_global_r
  that exists alongsize git_config_find_global).
  
  This also modifies the win32 version of p_realpath to allocate whatever
  buffer size is needed to accommodate the realpath instead of hardcoding
  a GIT_PATH_MAX limit, but that change needs to be tested still.
  

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• src/posix.c

• /*
   * Copyright (C) 2009-2011 the libgit2 contributors
   *
   * 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 "posix.h"
  #include "path.h"
  #include <stdio.h>
  #include <ctype.h>
  
  #ifndef GIT_WIN32
  
  int p_open(const char *path, int flags)
  {
  	return open(path, flags | O_BINARY);
  }
  
  int p_creat(const char *path, mode_t mode)
  {
  	return open(path, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, mode);
  }
  
  int p_getcwd(char *buffer_out, size_t size)
  {
  	char *cwd_buffer;
  
  	assert(buffer_out && size > 0);
  
  	cwd_buffer = getcwd(buffer_out, size);
  
  	if (cwd_buffer == NULL)
  		return git__throw(GIT_EOSERR, "Failed to retrieve current working directory");
  
  	git_path_mkposix(buffer_out);
  
  	git_path_string_to_dir(buffer_out, size);	//Ensure the path ends with a trailing slash
  
  	return GIT_SUCCESS;
  }
  
  int p_rename(const char *from, const char *to)
  {
  	if (!link(from, to)) {
  		p_unlink(from);
  		return GIT_SUCCESS;
  	}
  
  	if (!rename(from, to))
  		return GIT_SUCCESS;
  
  	return GIT_ERROR;
  
  }
  
  #endif
  
  int p_read(git_file fd, void *buf, size_t cnt)
  {
  	char *b = buf;
  	while (cnt) {
  		ssize_t r = read(fd, b, cnt);
  		if (r < 0) {
  			if (errno == EINTR || errno == EAGAIN)
  				continue;
  			return GIT_EOSERR;
  		}
  		if (!r)
  			break;
  		cnt -= r;
  		b += r;
  	}
  	return (int)(b - (char *)buf);
  }
  
  int p_write(git_file fd, const void *buf, size_t cnt)
  {
  	const char *b = buf;
  	while (cnt) {
  		ssize_t r = write(fd, b, cnt);
  		if (r < 0) {
  			if (errno == EINTR || errno == EAGAIN)
  				continue;
  			return GIT_EOSERR;
  		}
  		if (!r) {
  			errno = EPIPE;
  			return GIT_EOSERR;
  		}
  		cnt -= r;
  		b += r;
  	}
  	return GIT_SUCCESS;
  }
  

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