int read_and_exec(int socket) {
struct buf_t* buf = buf_new(8049);
int pos = buf_readuntil(socket, buf, '\n');
if (pos == -2)
return 0;
char* buffer = buf->data;
buffer[pos] = '\0';
struct execargs_t* arguments[1024];
int k = 0;
while (1) {
char delim;
int argc = count_words(buffer, '|');
if (argc == 0)
break;
char* argv[argc];
int shift;
int i = 0;
for (i = 0; i < argc; i++) {
delim = '|';
argv[i] = get_word(buffer, &delim, &shift);
buffer += shift;
}
arguments[k] = (struct execargs_t*) malloc(sizeof(struct execargs_t));
*arguments[k] = new_args(argc, argv);
shift = get_delim(buffer, '|');
buffer+=shift;
k++;
}
buf->size -= (buffer - (char*) buf->data + 1);
runpiped(arguments, k, socket);
buf_free(buf);
return 0;
}
// requires: exp be a c string, with no
// spaces and only valid characters.
int rpn(char *exp, int size) {
if (size == 1) {
return 0;
} else {
if (check_constraints(exp, size)) {
printf("%s\n", exp);
printf("Constraints not met\n");
return 1;
}
int delim_loc = get_delim(exp, size);
char delim = exp[delim_loc];
exp[delim_loc] = '\0';
exp[size - 1] = '\0';
char *left, *right;
left = exp + 1;
right = exp + delim_loc + 1;
if (rpn(left, strlen(left)) ||
rpn(right, strlen(right))) {
return 1;
}
merge(exp, left, right, delim);
return 0;
}
}
int get_line(char **lineptr,size_t *n,FILE *fp)
{
return (get_delim(lineptr,n,'\n',fp));
}
