1 files changed, 303 insertions, 0 deletions
diff --git a/src/util/posix.c b/src/util/posix.c
new file mode 100644
index 000000000..b1f85dc94
--- /dev/null
+++ b/src/util/posix.c
@@ -0,0 +1,303 @@
+/*
+ * 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 "posix.h"
+
+#include "fs_path.h"
+#include <stdio.h>
+#include <ctype.h>
+
+size_t p_fsync__cnt = 0;
+
+#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 = git__malloc(sizeof(struct addrinfo))) == NULL)
+		return -1;
+
+	if ((ainfo->ai_hostent = gethostbyname(host)) == NULL) {
+		git__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 = htons(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++) {
+		if (!(ai->ai_next = git__malloc(sizeof(struct addrinfo)))) {
+			p_freeaddrinfo(ainfo);
+			return -1;
+		}
+		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;
+		git__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;
+
+	#ifdef GIT_DEBUG_STRICT_OPEN
+	if (strstr(path, "//") != NULL) {
+		errno = EACCES;
+		return -1;
+	}
+	#endif
+
+	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;
+
+	GIT_ASSERT_ARG(buffer_out);
+	GIT_ASSERT_ARG(size > 0);
+
+	cwd_buffer = getcwd(buffer_out, size);
+
+	if (cwd_buffer == NULL)
+		return -1;
+
+	git_fs_path_mkposix(buffer_out);
+	git_fs_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 */
+
+ssize_t p_read(git_file fd, void *buf, size_t cnt)
+{
+	char *b = buf;
+
+	if (!git__is_ssizet(cnt)) {
+#ifdef GIT_WIN32
+		SetLastError(ERROR_INVALID_PARAMETER);
+#endif
+		errno = EINVAL;
+		return -1;
+	}
+
+	while (cnt) {
+		ssize_t r;
+#ifdef GIT_WIN32
+		r = read(fd, b, cnt > INT_MAX ? INT_MAX : (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 (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
+		GIT_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 git__mmap_alignment(size_t *alignment)
+{
+	/* dummy; here we don't need any alignment anyway */
+	*alignment = 4096;
+	return 0;
+}
+
+
+int p_mmap(git_map *out, size_t len, int prot, int flags, int fd, off64_t offset)
+{
+	const char *ptr;
+	size_t remaining_len;
+
+	GIT_MMAP_VALIDATE(out, len, prot, flags);
+
+	/* writes cannot be emulated without handling pagefaults since write happens by
+	 * writing to mapped memory */
+	if (prot & GIT_PROT_WRITE) {
+		git_error_set(GIT_ERROR_OS, "trying to map %s-writeable",
+				((flags & GIT_MAP_TYPE) == GIT_MAP_SHARED) ? "shared": "private");
+		return -1;
+	}
+
+	if (!git__is_ssizet(len)) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	out->len = 0;
+	out->data = git__malloc(len);
+	GIT_ERROR_CHECK_ALLOC(out->data);
+
+	remaining_len = len;
+	ptr = (const char *)out->data;
+	while (remaining_len > 0) {
+		ssize_t nb;
+		HANDLE_EINTR(nb, p_pread(fd, (void *)ptr, remaining_len, offset));
+		if (nb <= 0) {
+			git_error_set(GIT_ERROR_OS, "mmap emulation failed");
+			git__free(out->data);
+			out->data = NULL;
+			return -1;
+		}
+
+		ptr += nb;
+		offset += nb;
+		remaining_len -= nb;
+	}
+
+	out->len = len;
+	return 0;
+}
+
+int p_munmap(git_map *map)
+{
+	GIT_ASSERT_ARG(map);
+	git__free(map->data);
+
+	/* Initializing will help debug use-after-free */
+	map->len = 0;
+	map->data = NULL;
+
+	return 0;
+}
+
+#endif