tor-android/external/badvpn_dns/misc/write_file.h

105 lines
2.9 KiB
C

/**
* @file write_file.h
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef BADVPN_WRITE_FILE_H
#define BADVPN_WRITE_FILE_H
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <misc/debug.h>
#include <misc/cstring.h>
static int write_file (const char *file, const uint8_t *data, size_t len)
{
FILE *f = fopen(file, "w");
if (!f) {
goto fail0;
}
while (len > 0) {
size_t res = fwrite(data, 1, len, f);
if (res == 0) {
goto fail1;
}
ASSERT(res <= len)
data += res;
len -= res;
}
if (fclose(f) != 0) {
return 0;
}
return 1;
fail1:
fclose(f);
fail0:
return 0;
}
static int write_file_cstring (const char *file, b_cstring cstr, size_t offset, size_t length)
{
b_cstring_assert_range(cstr, offset, length);
FILE *f = fopen(file, "w");
if (!f) {
goto fail0;
}
B_CSTRING_LOOP_RANGE(cstr, offset, length, pos, chunk_data, chunk_length, {
size_t chunk_pos = 0;
while (chunk_pos < chunk_length) {
size_t res = fwrite(chunk_data + chunk_pos, 1, chunk_length - chunk_pos, f);
if (res == 0) {
goto fail1;
}
ASSERT(res <= chunk_length - chunk_pos)
chunk_pos += res;
}
})
if (fclose(f) != 0) {
return 0;
}
return 1;
fail1:
fclose(f);
fail0:
return 0;
}
#endif