124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*
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* This file Copyright (C) 2013-2014 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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*/
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#include <assert.h>
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#include <string.h> /* strlen () */
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#include "transmission.h"
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#include "error.h"
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#include "file.h"
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#include "utils.h"
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bool
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tr_sys_file_read_line (tr_sys_file_t handle,
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char * buffer,
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size_t buffer_size,
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tr_error ** error)
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{
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bool ret = false;
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size_t offset = 0;
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uint64_t bytes_read;
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assert (handle != TR_BAD_SYS_FILE);
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assert (buffer != NULL);
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assert (buffer_size > 0);
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while (buffer_size > 0)
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{
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size_t i;
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bool found_eol = false;
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ret = tr_sys_file_read (handle, buffer + offset, MIN(buffer_size, 1024u),
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&bytes_read, error);
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if (!ret || (offset == 0 && bytes_read == 0))
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{
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ret = false;
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break;
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}
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for (i = 0; i < bytes_read; ++i, ++offset, --buffer_size)
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{
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if (buffer[offset] == '\n')
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{
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found_eol = true;
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break;
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}
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}
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if (found_eol || buffer_size == 0 || bytes_read == 0)
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{
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const int64_t delta = -(int64_t) bytes_read + i + (found_eol ? 1 : 0);
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if (delta != 0)
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{
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ret = tr_sys_file_seek (handle, delta, TR_SEEK_CUR, NULL, error);
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if (!ret)
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break;
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}
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if (offset > 0 && buffer[offset - 1] == '\r')
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buffer[offset - 1] = '\0';
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else
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buffer[offset] = '\0';
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break;
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}
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}
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return ret;
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}
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bool
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tr_sys_file_write_line (tr_sys_file_t handle,
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const char * buffer,
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tr_error ** error)
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{
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bool ret;
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assert (handle != TR_BAD_SYS_FILE);
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assert (buffer != NULL);
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ret = tr_sys_file_write (handle, buffer, strlen (buffer), NULL, error);
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if (ret)
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ret = tr_sys_file_write (handle, TR_NATIVE_EOL_STR, TR_NATIVE_EOL_STR_SIZE,
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NULL, error);
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return ret;
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}
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bool
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tr_sys_file_write_fmt (tr_sys_file_t handle,
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const char * format,
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tr_error ** error,
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...)
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{
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bool ret = false;
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char * buffer;
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va_list args;
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assert (handle != TR_BAD_SYS_FILE);
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assert (format != NULL);
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va_start (args, error);
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buffer = tr_strdup_vprintf (format, args);
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va_end (args);
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if (buffer != NULL)
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{
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ret = tr_sys_file_write (handle, buffer, strlen (buffer), NULL, error);
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tr_free (buffer);
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}
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else
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{
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tr_error_set_literal (error, 0, "Unable to format message.");
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}
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return ret;
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}
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