thodg/libgit2/src/posix.c

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• Hash : 62e562f9
  Author :
  Date : 2014-05-18T07:54:41
  

  Fix compiler warning (git_off_t cast to size_t). Use size_t for page size, instead of long. Check result of sysconf. Use size_t for page offset so no cast to size_t (second arg to p_mmap). Use mod instead div/mult pair, so no cast to size_t is necessary.

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• src/posix.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 "posix.h"
  #include "path.h"
  #include <stdio.h>
  #include <ctype.h>
  
  #ifndef GIT_WIN32
  
  #ifdef NO_ADDRINFO
  
  int p_getaddrinfo(
  	const char *host,
  	const char *port,
  	struct addrinfo *hints,
  	struct addrinfo **info)
  {
  	struct addrinfo *ainfo, *ai;
  	int p = 0;
  
  	GIT_UNUSED(hints);
  
  	if ((ainfo = malloc(sizeof(struct addrinfo))) == NULL)
  		return -1;
  
  	if ((ainfo->ai_hostent = gethostbyname(host)) == NULL) {
  		free(ainfo);
  		return -2;
  	}
  
  	ainfo->ai_servent = getservbyname(port, 0);
  
  	if (ainfo->ai_servent)
  		ainfo->ai_port = ainfo->ai_servent->s_port;
  	else
  		ainfo->ai_port = atol(port);
  
  	memcpy(&ainfo->ai_addr_in.sin_addr,
  			ainfo->ai_hostent->h_addr_list[0],
  			ainfo->ai_hostent->h_length);
  
  	ainfo->ai_protocol = 0;
  	ainfo->ai_socktype = hints->ai_socktype;
  	ainfo->ai_family = ainfo->ai_hostent->h_addrtype;
  	ainfo->ai_addr_in.sin_family = ainfo->ai_family;
  	ainfo->ai_addr_in.sin_port = ainfo->ai_port;
  	ainfo->ai_addr = (struct addrinfo *)&ainfo->ai_addr_in;
  	ainfo->ai_addrlen = sizeof(struct sockaddr_in);
  
  	*info = ainfo;
  
  	if (ainfo->ai_hostent->h_addr_list[1] == NULL) {
  		ainfo->ai_next = NULL;
  		return 0;
  	}
  
  	ai = ainfo;
  
  	for (p = 1; ainfo->ai_hostent->h_addr_list[p] != NULL; p++) {
  		ai->ai_next = malloc(sizeof(struct addrinfo));
  		memcpy(&ai->ai_next, ainfo, sizeof(struct addrinfo));
  		memcpy(&ai->ai_next->ai_addr_in.sin_addr,
  			ainfo->ai_hostent->h_addr_list[p],
  			ainfo->ai_hostent->h_length);
  		ai->ai_next->ai_addr = (struct addrinfo *)&ai->ai_next->ai_addr_in;
  		ai = ai->ai_next;
  	}
  
  	ai->ai_next = NULL;
  	return 0;
  }
  
  void p_freeaddrinfo(struct addrinfo *info)
  {
  	struct addrinfo *p, *next;
  
  	p = info;
  
  	while(p != NULL) {
  		next = p->ai_next;
  		free(p);
  		p = next;
  	}
  }
  
  const char *p_gai_strerror(int ret)
  {
  	switch(ret) {
  	case -1: return "Out of memory"; break;
  	case -2: return "Address lookup failed"; break;
  	default: return "Unknown error"; break;
  	}
  }
  
  #endif /* NO_ADDRINFO */
  
  int p_open(const char *path, volatile int flags, ...)
  {
  	mode_t mode = 0;
  
  	if (flags & O_CREAT) {
  		va_list arg_list;
  
  		va_start(arg_list, flags);
  		mode = (mode_t)va_arg(arg_list, int);
  		va_end(arg_list);
  	}
  
  	return open(path, flags | O_BINARY | O_CLOEXEC, mode);
  }
  
  int p_creat(const char *path, mode_t mode)
  {
  	return open(path, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_CLOEXEC, 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 -1;
  
  	git_path_mkposix(buffer_out);
  	git_path_string_to_dir(buffer_out, size); /* append trailing slash */
  
  	return 0;
  }
  
  int p_rename(const char *from, const char *to)
  {
  	if (!link(from, to)) {
  		p_unlink(from);
  		return 0;
  	}
  
  	if (!rename(from, to))
  		return 0;
  
  	return -1;
  }
  
  #endif /* GIT_WIN32 */
  
  int p_read(git_file fd, void *buf, size_t cnt)
  {
  	char *b = buf;
  
  	while (cnt) {
  		ssize_t r;
  #ifdef GIT_WIN32
  		assert((size_t)((unsigned int)cnt) == cnt);
  		r = read(fd, b, (unsigned int)cnt);
  #else
  		r = read(fd, b, cnt);
  #endif
  		if (r < 0) {
  			if (errno == EINTR || errno == EAGAIN)
  				continue;
  			return -1;
  		}
  		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;
  #ifdef GIT_WIN32
  		assert((size_t)((unsigned int)cnt) == cnt);
  		r = write(fd, b, (unsigned int)cnt);
  #else
  		r = write(fd, b, cnt);
  #endif
  		if (r < 0) {
  			if (errno == EINTR || GIT_ISBLOCKED(errno))
  				continue;
  			return -1;
  		}
  		if (!r) {
  			errno = EPIPE;
  			return -1;
  		}
  		cnt -= r;
  		b += r;
  	}
  	return 0;
  }
  
  #ifdef NO_MMAP
  
  #include "map.h"
  
  int git__page_size(size_t *page_size)
  {
  	/* dummy; here we don't need any alignment anyway */
  	*page_size = 4096;
  	return 0;
  }
  
  
  int p_mmap(git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset)
  {
  	GIT_MMAP_VALIDATE(out, len, prot, flags);
  
  	out->data = NULL;
  	out->len = 0;
  
  	if ((prot & GIT_PROT_WRITE) && ((flags & GIT_MAP_TYPE) == GIT_MAP_SHARED)) {
  		giterr_set(GITERR_OS, "Trying to map shared-writeable");
  		return -1;
  	}
  
  	out->data = malloc(len);
  	GITERR_CHECK_ALLOC(out->data);
  
  	if ((p_lseek(fd, offset, SEEK_SET) < 0) || ((size_t)p_read(fd, out->data, len) != len)) {
  		giterr_set(GITERR_OS, "mmap emulation failed");
  		return -1;
  	}
  
  	out->len = len;
  	return 0;
  }
  
  int p_munmap(git_map *map)
  {
  	assert(map != NULL);
  	free(map->data);
  
  	return 0;
  }
  
  #endif
  

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