xv6-cs450/ls.c

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1 KiB
C
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#include "types.h"
#include "stat.h"
#include "user.h"
#include "fs.h"
char buf[512];
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struct stat st;
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struct dirent dirent;
int
main(int argc, char *argv[])
{
int fd;
uint off;
uint sz;
int i;
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if(argc > 1){
puts("Usage: ls\n");
exit();
}
fd = open(".", 0);
if(fd < 0){
printf(2, "ls: cannot open .\n");
exit();
}
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if (fstat(fd, &st) < 0) {
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printf(2, "ls: cannot open .\n");
exit();
}
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if (st.st_type != T_DIR) {
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printf(2, "ls: . is not a dir\n");
}
sz = st.st_size;
for(off = 0; off < sz; off += sizeof(struct dirent)) {
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if (read(fd, &dirent, sizeof(struct dirent)) != sizeof(struct dirent)) {
printf(1, "ls: read error\n");
break;
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}
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if (dirent.inum != 0) {
if (stat (dirent.name, &st) < 0) {
printf(1, "stat: failed\n");
break;
}
for (i = 0; i < DIRSIZ; i++) {
if (dirent.name[i] != '\0')
printf(1, "%c", dirent.name[i]);
else
printf(1, " ");
}
printf(1, "%d %d %d\n", st.st_type, dirent.inum, st.st_size);
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}
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}
close(fd);
exit();
}