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/* $OpenBSD: io.c,v 1.9 2020/09/12 15:46:48 claudio Exp $ */
/*
* Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and 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 <sys/queue.h>
#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
void
io_socket_blocking(int fd)
{
int fl;
if ((fl = fcntl(fd, F_GETFL, 0)) == -1)
err(1, "fcntl");
if (fcntl(fd, F_SETFL, fl & ~O_NONBLOCK) == -1)
err(1, "fcntl");
}
void
io_socket_nonblocking(int fd)
{
int fl;
if ((fl = fcntl(fd, F_GETFL, 0)) == -1)
err(1, "fcntl");
if (fcntl(fd, F_SETFL, fl | O_NONBLOCK) == -1)
err(1, "fcntl");
}
/*
* Blocking write of a binary buffer.
* Buffers of length zero are simply ignored.
*/
void
io_simple_write(int fd, const void *res, size_t sz)
{
ssize_t ssz;
if (sz == 0)
return;
if ((ssz = write(fd, res, sz)) == -1)
err(1, "write");
else if ((size_t)ssz != sz)
errx(1, "write: short write");
}
/*
* Like io_simple_write() but into a buffer.
*/
void
io_simple_buffer(char **b, size_t *bsz,
size_t *bmax, const void *res, size_t sz)
{
if (*bsz + sz > *bmax) {
if ((*b = realloc(*b, *bsz + sz)) == NULL)
err(1, NULL);
*bmax = *bsz + sz;
}
memcpy(*b + *bsz, res, sz);
*bsz += sz;
}
/*
* Like io_buf_write() but into a buffer.
*/
void
io_buf_buffer(char **b, size_t *bsz,
size_t *bmax, const void *p, size_t sz)
{
io_simple_buffer(b, bsz, bmax, &sz, sizeof(size_t));
if (sz > 0)
io_simple_buffer(b, bsz, bmax, p, sz);
}
/*
* Write a binary buffer of the given size, which may be zero.
*/
void
io_buf_write(int fd, const void *p, size_t sz)
{
io_simple_write(fd, &sz, sizeof(size_t));
io_simple_write(fd, p, sz);
}
/*
* Like io_str_write() but into a buffer.
*/
void
io_str_buffer(char **b, size_t *bsz, size_t *bmax, const char *p)
{
size_t sz = (p == NULL) ? 0 : strlen(p);
io_buf_buffer(b, bsz, bmax, p, sz);
}
/*
* Write a NUL-terminated string, which may be zero-length.
*/
void
io_str_write(int fd, const char *p)
{
size_t sz = (p == NULL) ? 0 : strlen(p);
io_buf_write(fd, p, sz);
}
/*
* Read of a binary buffer that must be on a blocking descriptor.
* Does nothing if "sz" is zero.
* This will fail and exit on EOF.
*/
void
io_simple_read(int fd, void *res, size_t sz)
{
ssize_t ssz;
char *tmp;
tmp = res; /* arithmetic on a pointer to void is a GNU extension */
again:
if (sz == 0)
return;
if ((ssz = read(fd, tmp, sz)) == -1)
err(1, "read");
else if (ssz == 0)
errx(1, "read: unexpected end of file");
else if ((size_t)ssz == sz)
return;
sz -= ssz;
tmp += ssz;
goto again;
}
/*
* Read a binary buffer, allocating space for it.
* If the buffer is zero-sized, this won't allocate "res", but
* will still initialise it to NULL.
*/
void
io_buf_read_alloc(int fd, void **res, size_t *sz)
{
*res = NULL;
io_simple_read(fd, sz, sizeof(size_t));
if (*sz == 0)
return;
if ((*res = malloc(*sz)) == NULL)
err(1, NULL);
io_simple_read(fd, *res, *sz);
}
/*
* Read a string (which may just be \0 and zero-length), allocating
* space for it.
*/
void
io_str_read(int fd, char **res)
{
size_t sz;
io_simple_read(fd, &sz, sizeof(size_t));
if ((*res = calloc(sz + 1, 1)) == NULL)
err(1, NULL);
io_simple_read(fd, *res, sz);
}
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