?? myfind.c
字號:
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <limits.h>
#include <errno.h>
#include "apue.h"
#include <fcntl.h>
#include <malloc.h>
#include <string.h>
#define MAXL 4096
typedef int Myfunc(const char *, const struct stat *, int);
/* function type that's called for each filename */
static Myfunc myfunc;
static Myfunc myfunc2;
static Myfunc myfunc3;
static int myftw(char *, Myfunc *);
static int dopath(Myfunc *);
static long nreg,nreg1, ndir, nblk, nchr, nfifo, nslink, nsock, ntot,total;
static char copy_argv[10][200],*name=NULL,*buff2=NULL;
static int copy_argc,length2;
int
main(int argc, char *argv[])
{
int ret,i,fd2;
total=0;
for(i=0;i<=argc-1;i++)
strcpy(copy_argv[i],argv[i]);//將argv數組拷到 copy_argv
copy_argc=argc;
if(argc==2){
ret = myftw(argv[1],myfunc); /* does it all */
total=0;
if ( (ntot = nreg + ndir + nblk + nchr + nfifo + nslink + nsock) == 0)
ntot = 1; /* avoid divide by 0; print 0 for all counts */
printf("regular files = %7ld, %5.2f %%\n", nreg, nreg*100.0/ntot);
printf("directories = %7ld, %5.2f %%\n", ndir, ndir*100.0/ntot);
printf("block special = %7ld, %5.2f %%\n", nblk, nblk*100.0/ntot);
printf("char special = %7ld, %5.2f %%\n", nchr, nchr*100.0/ntot);
printf("FIFOs = %7ld, %5.2f %%\n", nfifo, nfifo*100.0/ntot);
printf("symbolic links = %7ld, %5.2f %%\n", nslink,nslink*100.0/ntot);
printf("sockets = %7ld, %5.2f %%\n", nsock, nsock*100.0/ntot);
printf("length of regular files large than %d=quantity is%7ld,percent is%5.2f %%\n ",MAXL,nreg1,nreg1*100.0/ntot);
exit(ret);
}
else if((argc==4)&&((strcmp(argv[2],"-comp"))==0)){
total=0;
fd2=open(copy_argv[3],O_RDWR);
length2=lseek(fd2,0,SEEK_END);//計算文件的長度
lseek(fd2,0,SEEK_SET);
if((buff2=(char *)malloc(sizeof(char)*length2))==NULL){
printf("the length2 is %ld",length2);
err_sys("malloc error!!");
}
if((read(fd2,buff2,length2))!=length2)//將文件的內容考到buff2緩沖區
err_sys("read error!!");
close(fd2);
ret = myftw(argv[1], myfunc2);
if(total==0)//當沒有找到該文件時輸出
printf("Not Find!!!!\n");
}
else if((argc>=4)&&((strcmp(argv[2],"-name"))==0)){
total=0;
ret = myftw(argv[1], myfunc3);
if(total==0)
printf("Not Find!!!!\n");
}
else
printf("input error!!!");
}
/*
* Descend through the hierarchy, starting at "pathname".
* The caller's func() is called for every file.
*/
#define FTW_F 1 /* file other than directory */
#define FTW_D 2 /* directory */
#define FTW_DNR 3 /* directory that can't be read */
#define FTW_NS 4 /* file that we can't stat */
static char *fullpath; /* contains full pathname for every file */
static int /* we return whatever func() returns */
myftw(char *pathname, Myfunc *func)
{
int len;
fullpath = path_alloc(&len); /* malloc's for PATH_MAX+1 bytes */
/* ({Prog pathalloc}) */
strncpy(fullpath, pathname,len); /* initialize fullpath */
fullpath[len-1]=0;
return(dopath(func));
}
/*
* Descend through the hierarchy, starting at "fullpath".
* If "fullpath" is anything other than a directory, we lstat() it,
* call func(), and return. For a directory, we call ourself
* recursively for each name in the directory.
*/
static int /* we return whatever func() returns */
dopath(Myfunc* func)
{
struct stat statbuf;
struct dirent *dirp;
DIR *dp;
int ret;
char *ptr;
if (lstat(fullpath, &statbuf) < 0)
return(func(fullpath, &statbuf, FTW_NS)); /* stat error */
if (S_ISDIR(statbuf.st_mode) == 0)
return(func(fullpath, &statbuf, FTW_F)); /* not a directory */
/*
* It's a directory. First call func() for the directory,
* then process each filename in the directory.
*/
if ( (ret = func(fullpath, &statbuf, FTW_D)) != 0)
return(ret);
ptr = fullpath + strlen(fullpath); /* point to end of fullpath */
*ptr++ = '/';
*ptr = 0;
if ( (dp = opendir(fullpath)) == NULL)
return(func(fullpath, &statbuf, FTW_DNR));
/* can't read directory */
while ( (dirp = readdir(dp)) != NULL) {
if (strcmp(dirp->d_name, ".") == 0 ||
strcmp(dirp->d_name, "..") == 0)
continue; /* ignore dot and dot-dot */
strcpy(ptr, dirp->d_name); /* append name after slash */
if ( (ret = dopath(func)) != 0) /* recursive */
break; /* time to leave */
}
ptr[-1] = 0; /* erase everything from slash onwards */
if (closedir(dp) < 0)
err_ret("can't close directory %s", fullpath);
return(ret);
}
static int
myfunc(const char *pathname, const struct stat *statptr, int type)
{
int fd,length;
switch (type) {
case FTW_F:
switch (statptr->st_mode & S_IFMT) {
case S_IFREG:
nreg++; fd=open(pathname,O_WRONLY|O_CREAT,FILE_MODE);
if((length=lseek(fd,0,SEEK_END))<=MAXL) nreg1++;
close(fd);
break;
case S_IFBLK: nblk++; break;
case S_IFCHR: nchr++; break;
case S_IFIFO: nfifo++; break;
case S_IFLNK: nslink++; break;
case S_IFSOCK: nsock++; break;
case S_IFDIR:
err_dump("for S_IFDIR for %s", pathname);
// directories should have type = FTW_D
}
break;
case FTW_D:
ndir++;
break;
case FTW_DNR:
break;
case FTW_NS:
break;
}
return(0);
}
static int
myfunc2(const char *pathname, const struct stat *statptr, int type)
{
int fd1,len;
long length1,i;
char *buff1,*path,*buf2,*buf;
/* length=strlen(pathname)*sizeof(char);
path=(char *)malloc(length);
for(i=length-1;pathname[i]!='/';i--) ;
for(i=i+1,j=0;i<=length;i++,j++)
path[j]=pathname[i];
path[j]='\0';*/
if(type==FTW_F){
fd1=open(pathname,O_RDWR);
length1=lseek(fd1,0,SEEK_END);//計算文件的長度
lseek(fd1,0,SEEK_SET);
if(length1==length2){
if((buff1=(char *)malloc(sizeof(char)*length1))==NULL)
err_sys("malloc error!!");
if((read(fd1,buff1,length1))!=length1)//將文件的內容拷到buff1
err_sys("read error!!");
for(i=0;i<=length2-1;i++)
if(buff1[i]!=buff2[i])
break;
if(i>=length2){
total++;
if((path=(char *)malloc(strlen(pathname)*sizeof(char)))==NULL) return 0;
for(len=strlen(pathname)-1;pathname[len]!='/'&&len>=0;len--) ;//查找pathname文件所在目錄
for(i=0;i<=len;i++)//把文件pathname的目錄名拷貝到path里
path[i]=pathname[i];
path[i]='\0';
buf2=path_alloc(&len);
if(getcwd(buf2,len)==NULL) return 0;//用buf2保存當前程序所在的目錄
if(chdir(path)==-1) return 0;//切換到文件pathname所在的目錄
buf=path_alloc(&len);
if(getcwd(buf,len)==NULL) return 0;//用buf保存pathname所在的目錄
if(chdir(buf2)==-1) return 0;//切換回到程序運行所在的目錄
for(i=strlen(pathname)-1;pathname[i]!='/';i--) ;//把pathname文件名提取出來
strcat(buf,&pathname[i]);
printf("%s\n",buf);
}
free(buff1);
close(fd1);
}
}
return(0);
}
static int
myfunc3(const char *pathname, const struct stat *statptr, int type)
{
int i,len;
char *path,*ptr,*buf2,*buf;
if (type==FTW_F){
for(i=3;i<=copy_argc-1;i++){//逐個比較文件名
if((path=(char *)malloc(strlen(copy_argv[i])*sizeof(char)))==NULL)
err_quit("malloc error\n");
strcpy(path,&pathname[strlen(pathname)-strlen(copy_argv[i])]);
if((strcmp(path,copy_argv[i]))==0){
total++;
if((path=(char *)malloc(strlen(pathname)*sizeof(char)))==NULL) return 0;
for(len=strlen(pathname)-1;pathname[len]!='/'&&len>=0;len--) ;//查找pathname文件所在目錄
for(i=0;i<=len;i++)//把文件pathname的目錄名拷貝到path里
path[i]=pathname[i];
path[i]='\0';
buf2=path_alloc(&len);
if(getcwd(buf2,len)==NULL) return 0;//用buf2保存當前程序所在的目錄
if(chdir(path)==-1) return 0;//切換到文件pathname所在的目錄
buf=path_alloc(&len);
if(getcwd(buf,len)==NULL) return 0;//用buf保存pathname所在的目錄
if(chdir(buf2)==-1) return 0;//切換回到程序運行所在的目錄
for(i=strlen(pathname)-1;pathname[i]!='/';i--) ;//把pathname文件名提取出來
strcat(buf,&pathname[i]);
printf("%s\n",buf);
}
}
}
return(0);
}
#ifdef PATF_MAX
static int pathmax=PATH_MAX;
#else
static int pathmax=0;
#endif
#define SUSV3 200112L
static long posix_version=0;
#define PATH_MAX_GUESS 1024
char * path_alloc(int *sizep)
{
char *ptr;
int size;
if(posix_version==0)
posix_version=sysconf(_SC_VERSION);
if(pathmax==0){
errno=0;
if((pathmax=pathconf("/",_PC_PATH_MAX))<0){
if(errno==0)
pathmax=PATH_MAX_GUESS;
else
err_sys("pathconf error for _PC_PATH_MAX");
}
else {
pathmax++;
}
}
if(posix_version<SUSV3)
size=pathmax+1;
else
size=pathmax;
if((ptr=malloc(size))==NULL)
err_sys("mallco error for pathname");
if(sizep!=NULL)
*sizep=size;
return(ptr);
}
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