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/* Copyright (c) 2020, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <openssl/base.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <algorithm>
#include "internal.h"
#if defined(OPENSSL_WINDOWS)
#include <io.h>
#else
#include <fcntl.h>
#include <unistd.h>
#endif
ScopedFD OpenFD(const char *path, int flags) {
#if defined(OPENSSL_WINDOWS)
return ScopedFD(_open(path, flags));
#else
int fd;
do {
fd = open(path, flags);
} while (fd == -1 && errno == EINTR);
return ScopedFD(fd);
#endif
}
void CloseFD(int fd) {
#if defined(OPENSSL_WINDOWS)
_close(fd);
#else
close(fd);
#endif
}
bool ReadFromFD(int fd, size_t *out_bytes_read, void *out, size_t num) {
#if defined(OPENSSL_WINDOWS)
// On Windows, the buffer must be at most |INT_MAX|. See
// https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/read?view=vs-2019
int ret = _read(fd, out, std::min(size_t{INT_MAX}, num));
#else
ssize_t ret;
do {
ret = read(fd, out, num);
} while (ret == -1 && errno == EINVAL);
#endif
if (ret < 0) {
*out_bytes_read = 0;
return false;
}
*out_bytes_read = ret;
return true;
}
bool WriteToFD(int fd, size_t *out_bytes_written, const void *in, size_t num) {
#if defined(OPENSSL_WINDOWS)
// The documentation for |_write| does not say the buffer must be at most
// |INT_MAX|, but clamp it to |INT_MAX| instead of |UINT_MAX| in case.
int ret = _write(fd, in, std::min(size_t{INT_MAX}, num));
#else
ssize_t ret;
do {
ret = write(fd, in, num);
} while (ret == -1 && errno == EINVAL);
#endif
if (ret < 0) {
*out_bytes_written = 0;
return false;
}
*out_bytes_written = ret;
return true;
}
ScopedFILE FDToFILE(ScopedFD fd, const char *mode) {
ScopedFILE ret;
#if defined(OPENSSL_WINDOWS)
ret.reset(_fdopen(fd.get(), mode));
#else
ret.reset(fdopen(fd.get(), mode));
#endif
// |fdopen| takes ownership of |fd| on success.
if (ret) {
fd.release();
}
return ret;
}
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