Telodendria/src/Io.c

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/*
* Copyright (C) 2022-2023 Jordan Bancino <@jordan:bancino.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <Io.h>
#include <Memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
struct Io
{
IoFunctions io;
void *cookie;
};
Io *
IoCreate(void *cookie, IoFunctions funcs)
{
Io *io;
/* Must have at least read or write */
if (!funcs.read && !funcs.write)
{
return NULL;
}
io = Malloc(sizeof(Io));
if (!io)
{
return NULL;
}
io->cookie = cookie;
io->io.read = funcs.read;
io->io.write = funcs.write;
io->io.seek = funcs.seek;
io->io.close = funcs.close;
return io;
}
ssize_t
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IoRead(Io * io, void *buf, size_t nBytes)
{
if (!io || !io->io.read)
{
errno = EBADF;
return -1;
}
return io->io.read(io->cookie, buf, nBytes);
}
ssize_t
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IoWrite(Io * io, void *buf, size_t nBytes)
{
if (!io || !io->io.write)
{
errno = EBADF;
return -1;
}
return io->io.write(io->cookie, buf, nBytes);
}
off_t
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IoSeek(Io * io, off_t offset, int whence)
{
if (!io)
{
errno = EBADF;
return -1;
}
if (!io->io.seek)
{
errno = EINVAL;
return -1;
}
return io->io.seek(io->cookie, offset, whence);
}
int
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IoClose(Io * io)
{
int ret;
if (!io)
{
errno = EBADF;
return -1;
}
if (io->io.close)
{
ret = io->io.close(io->cookie);
}
else
{
ret = 0;
}
Free(io);
return ret;
}
int
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IoVprintf(Io * io, const char *fmt, va_list ap)
{
char *buf = NULL;
size_t bufSize = 0;
FILE *fp;
int ret;
if (!io || !fmt)
{
return -1;
}
fp = open_memstream(&buf, &bufSize);
if (!fp)
{
return -1;
}
ret = vfprintf(fp, fmt, ap);
fclose(fp);
if (ret >= 0)
{
ret = IoWrite(io, buf, bufSize);
}
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free(buf); /* Allocated by stdlib, not Memory
* API */
return ret;
}
int
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IoPrintf(Io * io, const char *fmt,...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = IoVprintf(io, fmt, ap);
va_end(ap);
return ret;
}
ssize_t
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IoCopy(Io * in, Io * out)
{
ssize_t nBytes = 0;
char buf[IO_BUFFER];
ssize_t rRes;
ssize_t wRes;
if (!in || !out)
{
errno = EBADF;
return -1;
}
while ((rRes = IoRead(in, &buf, IO_BUFFER)) != 0)
{
if (rRes == -1)
{
return -1;
}
wRes = IoWrite(out, &buf, rRes);
if (wRes == -1)
{
return -1;
}
nBytes += wRes;
}
return nBytes;
}