128 lines
2.4 KiB
C
128 lines
2.4 KiB
C
/* $Id: dba_write.c,v 1.3 2016/08/05 23:15:08 schwarze Exp $ */
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/*
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* Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Low-level functions for serializing allocation-based data to disk.
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* The interface is defined in "dba_write.h".
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*/
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#include "config.h"
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#include <assert.h>
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#if HAVE_ENDIAN
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#include <endian.h>
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#elif HAVE_SYS_ENDIAN
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#include <sys/endian.h>
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#elif HAVE_NTOHL
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#include <arpa/inet.h>
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#endif
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#if HAVE_ERR
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#include <err.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdio.h>
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#include "dba_write.h"
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static FILE *ofp;
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int
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dba_open(const char *fname)
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{
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ofp = fopen(fname, "w");
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return ofp == NULL ? -1 : 0;
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}
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int
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dba_close(void)
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{
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return fclose(ofp) == EOF ? -1 : 0;
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}
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int32_t
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dba_tell(void)
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{
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long pos;
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if ((pos = ftell(ofp)) == -1)
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err(1, "ftell");
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if (pos >= INT32_MAX) {
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errno = EOVERFLOW;
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err(1, "ftell = %ld", pos);
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}
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return pos;
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}
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void
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dba_seek(int32_t pos)
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{
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if (fseek(ofp, pos, SEEK_SET) == -1)
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err(1, "fseek(%d)", pos);
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}
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int32_t
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dba_align(void)
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{
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int32_t pos;
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pos = dba_tell();
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while (pos & 3) {
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dba_char_write('\0');
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pos++;
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}
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return pos;
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}
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int32_t
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dba_skip(int32_t nmemb, int32_t sz)
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{
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const int32_t out[5] = {0, 0, 0, 0, 0};
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int32_t i, pos;
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assert(sz >= 0);
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assert(nmemb > 0);
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assert(nmemb <= 5);
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pos = dba_tell();
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for (i = 0; i < sz; i++)
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if (nmemb - fwrite(&out, sizeof(out[0]), nmemb, ofp))
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err(1, "fwrite");
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return pos;
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}
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void
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dba_char_write(int c)
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{
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if (putc(c, ofp) == EOF)
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err(1, "fputc");
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}
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void
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dba_str_write(const char *str)
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{
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if (fputs(str, ofp) == EOF)
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err(1, "fputs");
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dba_char_write('\0');
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}
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void
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dba_int_write(int32_t i)
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{
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i = htobe32(i);
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if (fwrite(&i, sizeof(i), 1, ofp) != 1)
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err(1, "fwrite");
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}
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