int getnext(int nowrow,int nowcol){
char canput[10];
int i;
if(sudoku[nowrow][nowcol]!=0){//已经有数据
if(nowrow==8 && nowcol==8)
return 1;
else
return getnext(nowrow+(nowcol+1)/9,(nowcol+1)%9);
}
getput(nowrow,nowcol,canput);
for(i=1;i<=9;i++){
if(canput[i]){
if(nowrow==8 && nowcol==8){
sudoku[nowrow][nowcol]=i;
return 1;
}
sudoku[nowrow][nowcol]=i;
if(getnext(nowrow+(nowcol+1)/9,(nowcol+1)%9)){
return 1;
}
sudoku[nowrow][nowcol]=0;
}
}
return 0;
}
static void
ScanChar(void)
{
int startline = yyline;
/* keutzer
char c;
*/
int c;
int saw_backsl = 0;
while((c=getput())!=EOF) {
if (c=='\'' && !saw_backsl)
return;
if (c=='\\' && !saw_backsl) {
saw_backsl = 1;
continue;
}
saw_backsl = 0;
}
/* fall thru due to EOF */
yyerror2("unexpected EOF in character constant beginning on line %d",
startline);
nerrors++;
cleanup(1);
}
int main(int argc, char **argv) {
if (argc < 3) {
std::cerr << "usage: ./cp <input> <output> <optional>" << std::endl;
exit(1);
}
// Check to see if files exist
if (access(argv[1], F_OK) != 0) {
std::cerr << "source file doesn't exist or no permissions" << std::endl;
exit(1);
}
else perror("access");
if (access(argv[2], F_OK) == 0) {
std::cerr << "target file already exists" << std::endl;
exit(1);
}
else perror("access");
// Get size of file
unsigned long long size;
struct stat st;
if (stat(argv[1], &st) == 0) {
size = st.st_size;
} else {
perror("stat size check");
exit(1);
}
// Check if arg1 is directory
if (stat(argv[1], &st) == 0) {
if (S_ISDIR(st.st_mode)) {
std::cerr << "arg1 is directory" << std::endl;
exit(1);
}
} else {
perror("stat dir check");
}
// Check if arg2 is directory
if (stat(argv[2], &st) == 0) {
if (S_ISDIR(st.st_mode)) {
std::cerr << "arg2 is directory" << std::endl;
exit(1);
}
} else {
if(false) perror("stat");
}
if(argc == 3){
readwritebufsiz(size, argc, argv);
}
else{
getput(size, argc, argv);
readwrite1char(size, argc, argv);
readwritebufsiz(size, argc, argv);
}
return 0;
}
