static uint8_t xsync_handle_start(struct xsync_ctx_t * ctx)
{
char fpath[VFS_MAX_PATH];
char path[PACKET_DATA_MAX];
char buf[PACKET_DATA_MAX];
uint32_t crc1, crc2 = 0;
u64_t n;
crc1 = (ctx->packet.data[0] << 24) & 0xff000000;
crc1 |= (ctx->packet.data[1] << 16) & 0x00ff0000;
crc1 |= (ctx->packet.data[2] << 8) & 0x0000ff00;
crc1 |= (ctx->packet.data[3] << 0) & 0x000000ff;
memset(path, 0, sizeof(path));
memcpy(path, &ctx->packet.data[4], packet_dsize(&ctx->packet) - 4);
shell_realpath(path, fpath);
ctx->fd = vfs_open(fpath, O_RDONLY, 0);
if(ctx->fd > 0)
{
while((n = vfs_read(ctx->fd, buf, sizeof(buf))) > 0)
{
crc2 = crc32_sum(crc2, (const uint8_t *)buf, n);
}
vfs_close(ctx->fd);
ctx->fd = -1;
if((crc1 == crc2) && (crc2 != 0))
return 1;
}
ctx->fd = vfs_open(fpath, O_WRONLY | O_CREAT | O_TRUNC, 0755);
if(ctx->fd < 0)
return 0;
return 2;
}
static int do_rmdir(int argc, char ** argv)
{
char fpath[VFS_MAX_PATH];
int ret = 0;
int i;
if(argc < 2)
{
usage();
return -1;
}
for(i = 1; i < argc; i++)
{
if(shell_realpath(argv[i], fpath) < 0)
continue;
if(vfs_rmdir(fpath) != 0)
{
ret = -1;
printf("mkdir: failed to remove directory %s\r\n", fpath);
}
}
return ret;
}
/* change working directory
* ----------------------------------------------------------------------- */
int builtin_cd(int argc, char **argv) {
int c;
int ok = 0;
int symbolic = 1;
const char *arg;
unsigned long len;
unsigned long n;
stralloc newcwd;
/* check options, -L for symlink, -P for physical path */
while((c = shell_getopt(argc, argv, "LP")) > 0) {
switch(c) {
case 'L': symbolic = 1; break;
case 'P': symbolic = 0; break;
default: builtin_invopt(argv); return 1;
}
}
arg = argv[shell_optind];
stralloc_init(&newcwd);
/* empty argument means chdir(HOME) */
if(arg == NULL) {
arg = var_value("HOME", &len);
if(arg[0] == '\0') {
sh_msg("HOME variable not set!");
return 1;
}
}
len = str_len(arg);
/* when it isn't an absolute path we have to check CDPATH */
if(arg[0] != '/') {
char path[PATH_MAX + 1];
const char *cdpath;
/* loop through colon-separated CDPATH variable */
cdpath = var_value("CDPATH", NULL);
do {
/* too much, too much :) */
if((n = str_chr(cdpath, ':')) + len + 1 > PATH_MAX) {
/* set error code and print the longer string in the error msg */
errno = ENAMETOOLONG;
return builtin_errmsgn(argv, (n > len ? cdpath : arg),
(n > len ? n : len), strerror(errno));
}
/* copy path prefix from cdpath if present */
if(n) {
byte_copy(path, n, cdpath);
cdpath += n;
path[n++] = '/';
}
/* copy the argument and canonicalize */
str_copy(&path[n], arg);
ok = shell_realpath(path, &newcwd, symbolic, &sh->cwd);
/* skip the colon */
if(*cdpath == ':')
cdpath++;
} while(*cdpath && !ok);
}
/* absolute path */
else {
/* last cdpath length set to 0, because we're not using cdpath here */
n = 0;
ok = shell_canonicalize(arg, &newcwd, symbolic);
}
stralloc_nul(&newcwd);
/* try to chdir() if everything's ok */
if(ok && chdir(newcwd.s) == 0) {
/* print path if prefix was taken from cdpath */
if(n) {
buffer_putsa(fd_out->w, &newcwd);
buffer_putnlflush(fd_out->w);
}
/* set the path */
stralloc_move(&sh->cwd, &newcwd);
/* if the path has symlinks then set sh->cwdsym */
sh->cwdsym = (ok > 1);
return 0;
}
/* we failed */
builtin_error(argv, newcwd.s);
stralloc_free(&newcwd);
return 1;
}