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/* copy - copy a file from one path to another preserving permissions
*
* Author: Jamie Bullock <jamie@jamiebullock.com>
*
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* 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 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.
*
* For more information, please refer to <http://unlicense.org/>
*/
#include "m_pd.h"
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <poll.h>
#include <stdlib.h>
#include <sys/stat.h>
#ifdef __APPLE__
#define O_BINARY 0
#endif
#define CONSOLE_PREFIX "[copy]: "
typedef struct _copy
{
t_object x_obj;
t_outlet *outlet;
}
t_copy;
t_class *copy_class;
int copy(const char *source, const char *target);
void *copy_new(t_symbol *s, int argc, t_atom *argv)
{
t_copy *x = (t_copy *)pd_new(copy_class);
x->outlet = outlet_new(&x->x_obj, &s_float);
post(CONSOLE_PREFIX "copy file from source path to destination path");
return (void *)x;
}
void copy_list(t_copy *x, t_symbol *s, int ac, t_atom *av)
{
char source[MAXPDSTRING];
char target[MAXPDSTRING];
if(ac != 2 || (av[0].a_type != A_SYMBOL && av[1].a_type != A_SYMBOL))
{
pd_error(x, "expected a list containing <source path> <destination path>");
}
atom_string(&av[0], source, MAXPDSTRING);
atom_string(&av[1], target, MAXPDSTRING);
int rv = copy(source, target);
rv++;
if(rv)
{
post(CONSOLE_PREFIX "%s successfully copied to %s", source, target);
}
outlet_float(x->outlet, (t_float)rv);
}
void copy_setup(void)
{
copy_class = class_new(gensym("copy"),
(t_newmethod)copy_new,
0, sizeof(t_copy), 0,
A_GIMME, 0);
class_addlist(copy_class, copy_list);
}
void block(int fd, int event)
{
struct pollfd topoll;
topoll.fd = fd;
topoll.events = event;
poll(&topoll, 1, -1);
// no need to check errors - if the stream is bust then the
// next read/write will tell us
}
int copy_data_buffer(int fdin, int fdout, void *buf, size_t bufsize)
{
for(;;)
{
void *pos;
// read data to buffer
ssize_t bytestowrite = read(fdin, buf, bufsize);
if (bytestowrite == 0) break; // end of input
if (bytestowrite == -1)
{
if (errno == EINTR) continue; // signal handled
if (errno == EAGAIN)
{
block(fdin, POLLIN);
continue;
}
return -1;
}
// write data from buffer
pos = buf;
while (bytestowrite > 0)
{
ssize_t bytes_written = write(fdout, pos, bytestowrite);
if (bytes_written == -1)
{
if (errno == EINTR) continue;
if (errno == EAGAIN)
{
block(fdout, POLLOUT);
continue;
}
return -1;
}
bytestowrite -= bytes_written;
pos += bytes_written;
}
}
return 0;
}
#ifndef FILECOPY_BUFFER_SIZE
#define FILECOPY_BUFFER_SIZE (64*1024)
#endif
int copy_data(int fdin, int fdout)
{
for (size_t bufsize = FILECOPY_BUFFER_SIZE; bufsize >= 256; bufsize /= 2)
{
void *buffer = malloc(bufsize);
if (buffer != NULL)
{
int result = copy_data_buffer(fdin, fdout, buffer, bufsize);
free(buffer);
return result;
}
}
return -1;
}
int copy(const char *source, const char *target)
{
struct stat info;
int fdin = open(source, O_RDONLY|O_BINARY, 0);
if (fdin == -1)
{
error(CONSOLE_PREFIX "invalid input");
return -1;
}
int rv = fstat(fdin, &info);
if(rv == -1)
{
error(CONSOLE_PREFIX "stat failed\n");
return -1;
}
int fdout = open(target, O_WRONLY|O_BINARY|O_CREAT|O_TRUNC, info.st_mode);
if (fdout == -1)
{
error(CONSOLE_PREFIX "invalid output\n");
close(fdin);
return -1;
}
rv = copy_data(fdin, fdout);
if (rv == -1)
{
error(CONSOLE_PREFIX "copy failed\n");
}
return 0;
}
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