147 lines
3.8 KiB
C
147 lines
3.8 KiB
C
/*
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* Copyright (c) 2000 Satoru Takabayashi <satoru@namazu.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <string.h>
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#include <errno.h>
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#include "ttyrec.h"
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#define SWAP_ENDIAN(val) ((unsigned int) ( \
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(((unsigned int) (val) & (unsigned int) 0x000000ffU) << 24) | \
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(((unsigned int) (val) & (unsigned int) 0x0000ff00U) << 8) | \
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(((unsigned int) (val) & (unsigned int) 0x00ff0000U) >> 8) | \
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(((unsigned int) (val) & (unsigned int) 0xff000000U) >> 24)))
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static int
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is_little_endian ()
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{
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static int retval = -1;
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if (retval == -1)
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{
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int n = 1;
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char *p = (char *) &n;
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char x[] = { 1, 0, 0, 0 };
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assert (sizeof (int) == 4);
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if (memcmp (p, x, 4) == 0)
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{
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retval = 1;
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}
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else
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{
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retval = 0;
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}
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}
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return retval;
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}
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static int
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convert_to_little_endian (int x)
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{
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if (is_little_endian ())
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{
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return x;
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}
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else
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{
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return SWAP_ENDIAN (x);
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}
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}
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int
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read_header (FILE * fp, Header * h)
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{
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int buf[3];
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int numread;
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long offset;
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offset = ftell (fp);
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numread = fread (buf, sizeof (int), 3, fp);
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/* odd but possible race condition when full header isn't read because
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* it isn't there yet. */
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if (numread < 3)
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{
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fseek (fp, offset, SEEK_SET);
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return 0;
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}
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h->tv.tv_sec = convert_to_little_endian (buf[0]);
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h->tv.tv_usec = convert_to_little_endian (buf[1]);
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h->len = convert_to_little_endian (buf[2]);
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return 1;
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}
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int
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write_header (FILE * fp, Header * h)
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{
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int buf[3];
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buf[0] = convert_to_little_endian (h->tv.tv_sec);
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buf[1] = convert_to_little_endian (h->tv.tv_usec);
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buf[2] = convert_to_little_endian (h->len);
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if (fwrite (buf, sizeof (int), 3, fp) == 0)
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{
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return 0;
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}
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return 1;
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}
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static char *progname = "";
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void
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set_progname (const char *name)
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{
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progname = strdup (name);
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}
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FILE *
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efopen (const char *path, const char *mode)
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{
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FILE *fp = fopen (path, mode);
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if (fp == NULL)
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{
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fprintf (stderr, "%s: %s: %s\n", progname, path, strerror (errno));
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exit (EXIT_FAILURE);
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}
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return fp;
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}
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