pcp/libpcp/platform.h

#ifndef _HAVE_PCP_PLATFORM_H
#define _HAVE_PCP_PLATFORM_H

#if defined(CONFIG_H_FILE)
#include CONFIG_H_FILE
#elif defined(HAVE_CONFIG_H)
#include "config.h"
#else
#error Need either CONFIG_H_FILE or HAVE_CONFIG_H defined.
#endif

#ifdef HAVE_ENDIAN_H
#include <endian.h>
#else
#ifdef HAVE_SYS_ENDIAN_H
#include <sys/endian.h>
#else
#ifdef HAVE_BETOH32
// openbsd, use aliases
#define be32toh betoh32
#define htobe32 hto32be
#else

#if __BYTE_ORDER == __BIG_ENDIAN
// Copyright (c) 1999 Joseph Samuel Myers. bsd-games
#define be32toh(x)	((void)0)
#define htobe32(x)	((void)0)
#else
#define be32toh(x)	((u_int32_t)ntohl((u_int32_t)(x)))
#define htobe32(x)	((u_int32_t)htonl((u_int32_t)(x)))
#endif

#endif // HAVE_BETOH32
#endif // HAVE_SYS_ENDIAN_H
#endif // HAVE_ENDIAN_H


#ifndef HAVE_ARC4RANDOM_BUF
// shitty OS. we've got to use other stuff

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <stdint.h>

static inline FILE *__getranddev() {
  FILE *R;
  if((R = fopen("/dev/urandom", "rb")) == NULL) {
    // not even this is here! what a shame
    if((R = fopen("/dev/random", "rb")) == NULL) {
      // not available or depleted. that's too bad
      fprintf(stderr, "ERROR: /dev/urandom not available, /dev/random is depleted.\n");
      fprintf(stderr, "That's horrible for you but a nightmare for me. I die. Bye.\n");
      exit(2);
    }
  }
  return R;
}

static inline u_int32_t arc4random() {
  uint32_t x;
  FILE *R = __getranddev();
  fread(&x, sizeof(uint32_t), 1, R);
  fclose(R);
  return x;
}

static inline void arc4random_buf(void *buf, size_t nbytes) {
  FILE *R = __getranddev();
  fread(buf, nbytes, 1, R);
  fclose(R);
}


#endif


#endif /* !_HAVE_PCP_PLATFORM_H */