关于一个求entropy的程序 我是用VC编译的 由于VC中没有以下两个头文件
#include <unistd.h>
#include <idc.h>
我就直接拷贝这两个头文件到VC下的INCLUDE目录下，但是运行是出现“f:\program files\microsoft visual studio\vc98\include\sys\unistd.h( : fatal error C1083: Cannot open include file: '_ansi.h': No such file or directory”
我查看了unistd.h头文件 里面有句#include <_ansi.h>，所以我就把_ansi.h放到相应的INCLUDE目录下。但是还是出现上面的错误。
找不到答案，还请坛友指点指点。(代码是老师给的应该没问题，就是头文件调用可能出错)
以下是我程序：
#include <stdio.h>
#include <math.h>
#include <unistd.h>
#include <idc.h>
/**********************************************************************
* *
* File: entfile.c *
* Function: computes zero order entropy assuming 256 letter alphabet.*
* Author : K. Sayood *
* Last mod: 7/15/95 *
* Usage: see usage(), for details see entfile.doc or man page *
***********************************************************************/
/*******************************************************************************
*NOTICE: *
*This code is believed by the author to be bug free. You are free to use and *
*modify this code with the understanding that any use, either direct or *
*derivative, must contain acknowledgement of its author and source. The author*
*makes no warranty of any kind, expressed or implied, of merchantability or *
*fitness for a particular purpose. The author shall not be held liable for any*
*incidental or consequential damages in connection with or arising out of the *
*furnishing, performance, or use of this software. This software is not *
*authorized for use in life support devices or systems. *
********************************************************************************/
void usage(void);
main(int argc, char **argv)
{
FILE *ifp;
int i, c, size, hist[256];
float prob[256], count, entropy;
char name1[50];
strcpy(name1,argv[1]);
if((ifp = fopen(argv[1],"r") == NULL)
{
fprintf(stderr,"Input open failed\n";
usage();
exit(1);
}
/* Compute the histogram */
for(i=0; i<256; i++)
hist = 0;
size = 0;
while((c=getc(ifp))!=EOF)
{
hist[c]++;
size++;
}
count = (float) (size);
/* Compute the zero order probability model */
for(i=0; i< 256; i++)
prob= (float) hist/ count;
/* Compute the entropy */
entropy = ent(prob,256);
fprintf(stderr,"Entropy of file is %5.2f\n",entropy);
}
void usage(void)
{
fprintf(stderr,"usage:\n \t entfile filename [-l size] [-h]\n";
fprintf(stderr,"\t\t filename: name of file for which zero order entropy is\n";
fprintf(stderr,"\t\t\t to be calculated\n";
fprintf(stderr,"\t\t size : Size of file in bytes\n";
}
以下是头文件unistd.h的代码
#ifndef _SYS_UNISTD_H
#define _SYS_UNISTD_H
#ifdef __cplusplus
extern "C" {
#endif
#include <_ansi.h>
#include <sys/types.h>
#include <sys/_types.h>
#define __need_size_t
#define __need_ptrdiff_t
#include <stddef.h>
extern char **environ;
void _EXFUN(_exit, (int __status ) _ATTRIBUTE ((noreturn)));
int _EXFUN(access,(const char *__path, int __amode ));
unsigned _EXFUN(alarm, (unsigned __secs ));
int _EXFUN(chdir, (const char *__path ));
int _EXFUN(chmod, (const char *__path, mode_t __mode ));
#if !defined(__INSIDE_CYGWIN__)
int _EXFUN(chown, (const char *__path, uid_t __owner, gid_t __group ));
#endif
#if defined(__CYGWIN__) || defined(__rtems__)
int _EXFUN(chroot, (const char *__path ));
#endif
int _EXFUN(close, (int __fildes ));
char _EXFUN(*ctermid, (char *__s ));
char _EXFUN(*cuserid, (char *__s ));
#if defined(__CYGWIN__)
int _EXFUN(daemon, (int nochdir, int noclose));
#endif
int _EXFUN(dup, (int __fildes ));
int _EXFUN(dup2, (int __fildes, int __fildes2 ));
#if defined(__CYGWIN__)
void _EXFUN(endusershell, (void));
#endif
int _EXFUN(execl, (const char *__path, const char *, ... ));
int _EXFUN(execle, (const char *__path, const char *, ... ));
int _EXFUN(execlp, (const char *__file, const char *, ... ));
int _EXFUN(execv, (const char *__path, char * const __argv[] ));
int _EXFUN(execve, (const char *__path, char * const __argv[], char * const __envp[] ));
int _EXFUN(execvp, (const char *__file, char * const __argv[] ));
#if defined(__CYGWIN__) || defined(__rtems__)
int _EXFUN(fchdir, (int __fildes));
#endif
int _EXFUN(fchmod, (int __fildes, mode_t __mode ));
#if !defined(__INSIDE_CYGWIN__)
int _EXFUN(fchown, (int __fildes, uid_t __owner, gid_t __group ));
#endif
pid_t _EXFUN(fork, (void ));
long _EXFUN(fpathconf, (int __fd, int __name ));
int _EXFUN(fsync, (int __fd));
int _EXFUN(fdatasync, (int __fd));
char _EXFUN(*getcwd, (char *__buf, size_t __size ));
#if defined(__CYGWIN__)
int _EXFUN(getdomainname ,(char *__name, size_t __len));
#endif
#if !defined(__INSIDE_CYGWIN__)
gid_t _EXFUN(getegid, (void ));
uid_t _EXFUN(geteuid, (void ));
gid_t _EXFUN(getgid, (void ));
#endif
int _EXFUN(getgroups, (int __gidsetsize, gid_t __grouplist[] ));
#if defined(__CYGWIN__)
long _EXFUN(gethostid, (void));
#endif
char _EXFUN(*getlogin, (void ));
#if defined(_POSIX_THREAD_SAFE_FUNCTIONS)
int _EXFUN(getlogin_r, (char *name, size_t namesize) );
#endif
char _EXFUN(*getpass, (const char *__prompt));
size_t _EXFUN(getpagesize, (void));
#if defined(__CYGWIN__)
int _EXFUN(getpeereid, (int, uid_t *, gid_t *));
#endif
pid_t _EXFUN(getpgid, (pid_t));
pid_t _EXFUN(getpgrp, (void ));
pid_t _EXFUN(getpid, (void ));
pid_t _EXFUN(getppid, (void ));
#ifdef __CYGWIN__
pid_t _EXFUN(getsid, (pid_t));
#endif
#if !defined(__INSIDE_CYGWIN__)
uid_t _EXFUN(getuid, (void ));
#endif
#ifdef __CYGWIN__
char * _EXFUN(getusershell, (void));
char _EXFUN(*getwd, (char *__buf ));
int _EXFUN(iruserok, (unsigned long raddr, int superuser, const char *ruser, const char *luser));
#endif
int _EXFUN(isatty, (int __fildes ));
#if !defined(__INSIDE_CYGWIN__)
int _EXFUN(lchown, (const char *__path, uid_t __owner, gid_t __group ));
#endif
int _EXFUN(link, (const char *__path1, const char *__path2 ));
int _EXFUN(nice, (int __nice_value ));
#if !defined(__INSIDE_CYGWIN__)
off_t _EXFUN(lseek, (int __fildes, off_t __offset, int __whence ));
#endif
long _EXFUN(pathconf, (const char *__path, int __name ));
int _EXFUN(pause, (void ));
#ifdef __CYGWIN__
int _EXFUN(pthread_atfork, (void (*)(void), void (*)(void), void (*)(void)));
#endif
int _EXFUN(pipe, (int __fildes[2] ));
ssize_t _EXFUN(pread, (int __fd, void *__buf, size_t __nbytes, off_t __offset));
ssize_t _EXFUN(pwrite, (int __fd, const void *__buf, size_t __nbytes, off_t __offset));
_READ_WRITE_RETURN_TYPE _EXFUN(read, (int __fd, void *__buf, size_t __nbyte ));
#if defined(__CYGWIN__)
int _EXFUN(rresvport, (int *__alport));
int _EXFUN(revoke, (char *__path));
#endif
int _EXFUN(rmdir, (const char *__path ));
#if defined(__CYGWIN__)
int _EXFUN(ruserok, (const char *rhost, int superuser, const char *ruser, const char *luser));
#endif
void * _EXFUN(sbrk, (ptrdiff_t __incr));
#if !defined(__INSIDE_CYGWIN__)
#if defined(__CYGWIN__)
int _EXFUN(setegid, (gid_t __gid ));
int _EXFUN(seteuid, (uid_t __uid ));
#endif
int _EXFUN(setgid, (gid_t __gid ));
#endif
#if defined(__CYGWIN__)
int _EXFUN(setgroups, (int ngroups, const gid_t *grouplist ));
#endif
int _EXFUN(setpgid, (pid_t __pid, pid_t __pgid ));
int _EXFUN(setpgrp, (void ));
#if defined(__CYGWIN__) && !defined(__INSIDE_CYGWIN__)
int _EXFUN(setregid, (gid_t __rgid, gid_t __egid));
int _EXFUN(setreuid, (uid_t __ruid, uid_t __euid));
#endif
pid_t _EXFUN(setsid, (void ));
#if !defined(__INSIDE_CYGWIN__)
int _EXFUN(setuid, (uid_t __uid ));
#endif
#if defined(__CYGWIN__)
void _EXFUN(setusershell, (void));
#endif
unsigned _EXFUN(sleep, (unsigned int __seconds ));
void _EXFUN(swab, (const void *, void *, ssize_t));
long _EXFUN(sysconf, (int __name ));
pid_t _EXFUN(tcgetpgrp, (int __fildes ));
int _EXFUN(tcsetpgrp, (int __fildes, pid_t __pgrp_id ));
char _EXFUN(*ttyname, (int __fildes ));
#if defined(__CYGWIN__)
int _EXFUN(ttyname_r, (int, char *, size_t));
#endif
int _EXFUN(unlink, (const char *__path ));
int _EXFUN(vhangup, (void ));
_READ_WRITE_RETURN_TYPE _EXFUN(write, (int __fd, const void *__buf, size_t __nbyte ));
#ifdef __CYGWIN__
# define __UNISTD_GETOPT__
# include <getopt.h>
# undef __UNISTD_GETOPT__
#else
extern char *optarg; /* getopt(3) external variables */
extern int optind, opterr, optopt;
int getopt(int, char * const [], const char *);
extern int optreset; /* getopt(3) external variable */
#endif
#ifndef _POSIX_SOURCE
pid_t _EXFUN(vfork, (void ));
extern char *suboptarg; /* getsubopt(3) external variable */
int getsubopt(char **, char * const *, char **);
#endif /* _POSIX_SOURCE */
#ifdef _COMPILING_NEWLIB
/* Provide prototypes for most of the _<systemcall> names that are
provided in newlib for some compilers. */
int _EXFUN(_close, (int __fildes ));
pid_t _EXFUN(_fork, (void ));
pid_t _EXFUN(_getpid, (void ));
int _EXFUN(_link, (const char *__path1, const char *__path2 ));
_off_t _EXFUN(_lseek, (int __fildes, _off_t __offset, int __whence ));
#ifdef __LARGE64_FILES
_off64_t _EXFUN(_lseek64, (int __filedes, _off64_t __offset, int __whence ));
#endif
_READ_WRITE_RETURN_TYPE _EXFUN(_read, (int __fd, void *__buf, size_t __nbyte ));
void * _EXFUN(_sbrk, (ptrdiff_t __incr));
int _EXFUN(_unlink, (const char *__path ));
_READ_WRITE_RETURN_TYPE _EXFUN(_write, (int __fd, const void *__buf, size_t __nbyte ));
int _EXFUN(_execve, (const char *__path, char * const __argv[], char * const __envp[] ));
#endif
#if defined(__CYGWIN__) || defined(__rtems__) || defined(__sh__)
#if !defined(__INSIDE_CYGWIN__)
int _EXFUN(ftruncate, (int __fd, off_t __length));
int _EXFUN(truncate, (const char *, off_t __length));
#endif
#endif
#if defined(__CYGWIN__) || defined(__rtems__)
int _EXFUN(getdtablesize, (void));
int _EXFUN(setdtablesize, (int));
useconds_t _EXFUN(ualarm, (useconds_t __useconds, useconds_t __interval));
unsigned _EXFUN(usleep, (unsigned int __useconds));
#if !(defined (_WINSOCK_H) || defined (__USE_W32_SOCKETS))
/* winsock[2].h defines as __stdcall, and with int as 2nd arg */
int _EXFUN(gethostname, (char *__name, size_t __len));
#endif
char * _EXFUN(mktemp, (char *));
#if defined(__CYGWIN__)
void _EXFUN(sync, (void));
#else /* defined(__rtems__) */
int _EXFUN(sync, (void));
#endif
#endif
int _EXFUN(readlink, (const char *__path, char *__buf, int __buflen));
int _EXFUN(symlink, (const char *__name1, const char *__name2));
#define F_OK 0
#define R_OK 4
#define W_OK 2
#define X_OK 1
# define SEEK_SET 0
# define SEEK_CUR 1
# define SEEK_END 2
#include <sys/features.h>
#define STDIN_FILENO 0 /* standard input file descriptor */
#define STDOUT_FILENO 1 /* standard output file descriptor */
#define STDERR_FILENO 2 /* standard error file descriptor */
/*
* 4.8.1 Get Configurable System Variables, P1003.1b-1993, p. 96
*
* NOTE: Table 4-2, Configurable System Variables, p. 96
*/
#define _SC_ARG_MAX 0
#define _SC_CHILD_MAX 1
#define _SC_CLK_TCK 2
#define _SC_NGROUPS_MAX 3
#define _SC_OPEN_MAX 4
/* no _SC_STREAM_MAX */
#define _SC_JOB_CONTROL 5
#define _SC_SAVED_IDS 6
#define _SC_VERSION 7
#define _SC_PAGESIZE 8
/* CYGWIN-specific values .. do not touch */
#define _SC_NPROCESSORS_CONF 9
#define _SC_NPROCESSORS_ONLN 10
#define _SC_PHYS_PAGES 11
#define _SC_AVPHYS_PAGES 12
/* end of CYGWIN-specific values */
#define _SC_MQ_OPEN_MAX 13
#define _SC_MQ_PRIO_MAX 14
#define _SC_RTSIG_MAX 15
#define _SC_SEM_NSEMS_MAX 16
#define _SC_SEM_VALUE_MAX 17
#define _SC_SIGQUEUE_MAX 18
#define _SC_TIMER_MAX 19
#define _SC_TZNAME_MAX 20
#define _SC_ASYNCHRONOUS_IO 21
#define _SC_FSYNC 22
#define _SC_MAPPED_FILES 23
#define _SC_MEMLOCK 24
#define _SC_MEMLOCK_RANGE 25
#define _SC_MEMORY_PROTECTION 26
#define _SC_MESSAGE_PASSING 27
#define _SC_PRIORITIZED_IO 28
#define _SC_REALTIME_SIGNALS 29
#define _SC_SEMAPHORES 30
#define _SC_SHARED_MEMORY_OBJECTS 31
#define _SC_SYNCHRONIZED_IO 32
#define _SC_TIMERS 33
#define _SC_AIO_LISTIO_MAX 34
#define _SC_AIO_MAX 35
#define _SC_AIO_PRIO_DELTA_MAX 36
#define _SC_DELAYTIMER_MAX 37
/*
* P1003.1c/D10, p. 52 adds the following.
*/
#define _SC_THREAD_KEYS_MAX 38
#define _SC_THREAD_STACK_MIN 39
#define _SC_THREAD_THREADS_MAX 40
#define _SC_TTY_NAME_MAX 41
#define _SC_THREADS 42
#define _SC_THREAD_ATTR_STACKADDR 43
#define _SC_THREAD_ATTR_STACKSIZE 44
#define _SC_THREAD_PRIORITY_SCHEDULING 45
#define _SC_THREAD_PRIO_INHERIT 46
/* _SC_THREAD_PRIO_PROTECT was _SC_THREAD_PRIO_CEILING in early drafts */
#define _SC_THREAD_PRIO_PROTECT 47
#define _SC_THREAD_PRIO_CEILING _SC_THREAD_PRIO_PROTECT
#define _SC_THREAD_PROCESS_SHARED 48
#define _SC_THREAD_SAFE_FUNCTIONS 49
#define _SC_GETGR_R_SIZE_MAX 50
#define _SC_GETPW_R_SIZE_MAX 51
#define _SC_LOGIN_NAME_MAX 52
#define _SC_THREAD_DESTRUCTOR_ITERATIONS 53
#if !defined(__CYGWIN__) && !defined(__rtems__)
#define _SC_STREAM_MAX 100
#define _SC_PRIORITY_SCHEDULING 101
#endif
# define _PC_LINK_MAX 0
# define _PC_MAX_CANON 1
# define _PC_MAX_INPUT 2
# define _PC_NAME_MAX 3
# define _PC_PATH_MAX 4
# define _PC_PIPE_BUF 5
# define _PC_CHOWN_RESTRICTED 6
# define _PC_NO_TRUNC 7
# define _PC_VDISABLE 8
# define _PC_ASYNC_IO 9
# define _PC_PRIO_IO 10
# define _PC_SYNC_IO 11
#ifdef __CYGWIN__
/* Ask for POSIX permission bits support. */
# define _PC_POSIX_PERMISSIONS 90
/* Ask for full POSIX permission support including uid/gid settings. */
# define _PC_POSIX_SECURITY 91
#endif
/* FIXME: This is temporary until winsup gets sorted out. */
#ifdef __CYGWIN__
#define MAXPATHLEN (260 - 1 /* NUL */)
#else
# define MAXPATHLEN 1024
#endif
#ifdef __cplusplus
}
#endif
#endif /* _SYS_UNISTD_H */
[此贴子已经被作者于2007-9-23 23:09:55编辑过]
