《操作系统》的实验代码。
 
 
 
 
 

118 righe
2.5 KiB

#include <ulib.h>
#include <stdio.h>
#include <string.h>
#include <dir.h>
#include <file.h>
#include <stat.h>
#include <dirent.h>
#include <unistd.h>
#define printf(...) fprintf(1, __VA_ARGS__)
#define BUFSIZE 4096
static char
getmode(uint32_t st_mode) {
char mode = '?';
if (S_ISREG(st_mode)) mode = '-';
if (S_ISDIR(st_mode)) mode = 'd';
if (S_ISLNK(st_mode)) mode = 'l';
if (S_ISCHR(st_mode)) mode = 'c';
if (S_ISBLK(st_mode)) mode = 'b';
return mode;
}
static int
getstat(const char *name, struct stat *stat) {
int fd, ret;
if ((fd = open(name, O_RDONLY)) < 0) {
return fd;
}
ret = fstat(fd, stat);
close(fd);
return ret;
}
void
lsstat(struct stat *stat, const char *filename) {
printf(" [%c]", getmode(stat->st_mode));
printf(" %3d(h)", stat->st_nlinks);
printf(" %8d(b)", stat->st_blocks);
printf(" %8d(s)", stat->st_size);
printf(" %s\n", filename);
}
int
lsdir(const char *path) {
struct stat __stat, *stat = &__stat;
int ret;
DIR *dirp = opendir(".");
if (dirp == NULL) {
return -1;
}
struct dirent *direntp;
while ((direntp = readdir(dirp)) != NULL) {
if ((ret = getstat(direntp->name, stat)) != 0) {
goto failed;
}
lsstat(stat, direntp->name);
}
printf("lsdir: step 4\n");
closedir(dirp);
return 0;
failed:
closedir(dirp);
return ret;
}
int
ls(const char *path) {
struct stat __stat, *stat = &__stat;
int ret, type;
if ((ret = getstat(path, stat)) != 0) {
return ret;
}
static const char *filetype[] = {
" [ file ]",
" [directory]",
" [ symlink ]",
" [character]",
" [ block ]",
" [ ????? ]",
};
switch (getmode(stat->st_mode)) {
case '0': type = 0; break;
case 'd': type = 1; break;
case 'l': type = 2; break;
case 'c': type = 3; break;
case 'b': type = 4; break;
default: type = 5; break;
}
printf(" @ is %s", filetype[type]);
printf(" %d(hlinks)", stat->st_nlinks);
printf(" %d(blocks)", stat->st_blocks);
printf(" %d(bytes) : @'%s'\n", stat->st_size, path);
if (S_ISDIR(stat->st_mode)) {
return lsdir(path);
}
return 0;
}
int
main(int argc, char **argv) {
if (argc == 1) {
return ls(".");
}
else {
int i, ret;
for (i = 1; i < argc; i ++) {
if ((ret = ls(argv[i])) != 0) {
return ret;
}
}
}
return 0;
}