Annotation of dgamelaunch-openbsd/io.c, Revision 1.1
1.1 ! rubenllo 1: /*
! 2: * Copyright (c) 2000 Satoru Takabayashi <satoru@namazu.org>
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. All advertising materials mentioning features or use of this software
! 14: * must display the following acknowledgement:
! 15: * This product includes software developed by the University of
! 16: * California, Berkeley and its contributors.
! 17: * 4. Neither the name of the University nor the names of its contributors
! 18: * may be used to endorse or promote products derived from this software
! 19: * without specific prior written permission.
! 20: *
! 21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 31: * SUCH DAMAGE.
! 32: */
! 33:
! 34: #include <stdio.h>
! 35: #include <stdlib.h>
! 36: #include <assert.h>
! 37: #include <string.h>
! 38: #include <errno.h>
! 39:
! 40: #include "ttyrec.h"
! 41:
! 42: #define SWAP_ENDIAN(val) ((unsigned int) ( \
! 43: (((unsigned int) (val) & (unsigned int) 0x000000ffU) << 24) | \
! 44: (((unsigned int) (val) & (unsigned int) 0x0000ff00U) << 8) | \
! 45: (((unsigned int) (val) & (unsigned int) 0x00ff0000U) >> 8) | \
! 46: (((unsigned int) (val) & (unsigned int) 0xff000000U) >> 24)))
! 47:
! 48: static int
! 49: is_little_endian ()
! 50: {
! 51: static int retval = -1;
! 52:
! 53: if (retval == -1)
! 54: {
! 55: int n = 1;
! 56: char *p = (char *) &n;
! 57: char x[] = { 1, 0, 0, 0 };
! 58:
! 59: assert (sizeof (int) == 4);
! 60:
! 61: if (memcmp (p, x, 4) == 0)
! 62: {
! 63: retval = 1;
! 64: }
! 65: else
! 66: {
! 67: retval = 0;
! 68: }
! 69: }
! 70:
! 71: return retval;
! 72: }
! 73:
! 74: static int
! 75: convert_to_little_endian (int x)
! 76: {
! 77: if (is_little_endian ())
! 78: {
! 79: return x;
! 80: }
! 81: else
! 82: {
! 83: return SWAP_ENDIAN (x);
! 84: }
! 85: }
! 86:
! 87: int
! 88: read_header (FILE * fp, Header * h)
! 89: {
! 90: int buf[3];
! 91: int numread;
! 92: long offset;
! 93:
! 94: offset = ftell (fp);
! 95: numread = fread (buf, sizeof (int), 3, fp);
! 96:
! 97: /* odd but possible race condition when full header isn't read because
! 98: * it isn't there yet. */
! 99: if (numread < 3)
! 100: {
! 101: fseek (fp, offset, SEEK_SET);
! 102: return 0;
! 103: }
! 104:
! 105: h->tv.tv_sec = convert_to_little_endian (buf[0]);
! 106: h->tv.tv_usec = convert_to_little_endian (buf[1]);
! 107: h->len = convert_to_little_endian (buf[2]);
! 108:
! 109: return 1;
! 110: }
! 111:
! 112: int
! 113: write_header (FILE * fp, Header * h)
! 114: {
! 115: int buf[3];
! 116:
! 117: buf[0] = convert_to_little_endian (h->tv.tv_sec);
! 118: buf[1] = convert_to_little_endian (h->tv.tv_usec);
! 119: buf[2] = convert_to_little_endian (h->len);
! 120:
! 121: if (fwrite (buf, sizeof (int), 3, fp) == 0)
! 122: {
! 123: return 0;
! 124: }
! 125:
! 126: return 1;
! 127: }
! 128:
! 129: static char *progname = "";
! 130: void
! 131: set_progname (const char *name)
! 132: {
! 133: progname = strdup (name);
! 134: }
! 135:
! 136: FILE *
! 137: efopen (const char *path, const char *mode)
! 138: {
! 139: FILE *fp = fopen (path, mode);
! 140: if (fp == NULL)
! 141: {
! 142: fprintf (stderr, "%s: %s: %s\n", progname, path, strerror (errno));
! 143: exit (EXIT_FAILURE);
! 144: }
! 145: return fp;
! 146: }
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