1 /* $Id: dba_write.c,v 1.3 2016/08/05 23:15:08 schwarze Exp $ */
3 * Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 * Low-level functions for serializing allocation-based data to disk.
18 * The interface is defined in "dba_write.h".
26 #include <sys/endian.h>
28 #include <arpa/inet.h>
38 #include "dba_write.h"
44 dba_open(const char *fname)
46 ofp = fopen(fname, "w");
47 return ofp == NULL ? -1 : 0;
53 return fclose(ofp) == EOF ? -1 : 0;
61 if ((pos = ftell(ofp)) == -1)
63 if (pos >= INT32_MAX) {
65 err(1, "ftell = %ld", pos);
73 if (fseek(ofp, pos, SEEK_SET) == -1)
74 err(1, "fseek(%d)", pos);
91 dba_skip(int32_t nmemb, int32_t sz)
93 const int32_t out[5] = {0, 0, 0, 0, 0};
100 for (i = 0; i < sz; i++)
101 if (nmemb - fwrite(&out, sizeof(out[0]), nmemb, ofp))
107 dba_char_write(int c)
109 if (putc(c, ofp) == EOF)
114 dba_str_write(const char *str)
116 if (fputs(str, ofp) == EOF)
118 dba_char_write('\0');
122 dba_int_write(int32_t i)
125 if (fwrite(&i, sizeof(i), 1, ofp) != 1)