int cmd_auto_complete(const char *const prompt, char *buf, int *np, int *colp)
{
int n = *np, col = *colp;
char *argv[CONFIG_SYS_MAXARGS + 1]; /* NULL terminated */
char *cmdv[20];
char *s, *t;
const char *sep;
int i, j, k, len, seplen, argc;
int cnt;
char last_char;
if (strcmp(prompt, CONFIG_SYS_PROMPT) != 0)
return 0; /* not in normal console */
cnt = strlen(buf);
if (cnt >= 1)
last_char = buf[cnt - 1];
else
last_char = '\0';
/* copy to secondary buffer which will be affected */
strcpy(tmp_buf, buf);
/* separate into argv */
argc = make_argv(tmp_buf, sizeof(argv)/sizeof(argv[0]), argv);
/* do the completion and return the possible completions */
i = complete_cmdv(argc, argv, last_char, sizeof(cmdv)/sizeof(cmdv[0]), cmdv);
/* no match; bell and out */
if (i == 0) {
if (argc > 1) /* allow tab for non command */
return 0;
putc('\a');
return 1;
}
s = NULL;
len = 0;
sep = NULL;
seplen = 0;
if (i == 1) { /* one match; perfect */
k = strlen(argv[argc - 1]);
s = cmdv[0] + k;
len = strlen(s);
sep = " ";
seplen = 1;
} else if (i > 1 && (j = find_common_prefix(cmdv)) != 0) { /* more */
k = strlen(argv[argc - 1]);
j -= k;
if (j > 0) {
s = cmdv[0] + k;
len = j;
}
}
if (s != NULL) {
k = len + seplen;
/* make sure it fits */
if (n + k >= CONFIG_SYS_CBSIZE - 2) {
putc('\a');
return 1;
}
t = buf + cnt;
for (i = 0; i < len; i++)
*t++ = *s++;
if (sep != NULL)
for (i = 0; i < seplen; i++)
*t++ = sep[i];
*t = '\0';
n += k;
col += k;
puts(t - k);
if (sep == NULL)
putc('\a');
*np = n;
*colp = col;
} else {
print_argv(NULL, " ", " ", 78, cmdv);
puts(prompt);
puts(buf);
}
return 1;
}
void build_embedfront() {
char one_byte = '\0';
char previous_term[MAX_WORD_LENGTH+1];
long long i;
dict_embedfront_t *one_header;
char *node_buffer = NULL, *postings_buffer = NULL, *term_buffer = NULL;
char *node_ptr = NULL, *postings_ptr = NULL, *term_ptr = NULL;
long long node_max_size;
long long needed_size, used_size;
if (block_size <= 0) {
fprintf(stderr, "ERROR: block size cannot be zero or less\n");
exit(2);
}
//
// (1) find the maximum size for the node and create temporary buffers
//
node_max_size = hd_sector_size * num_of_sectors;
printf(" node_max_size: %lld\n", node_max_size);
postings_buffer = (char *)malloc(node_max_size);
memset(postings_buffer, 0, node_max_size);
term_buffer = (char *)malloc(node_max_size);
printf("building embedfront......\n");
//
// (2) create lists for headers and nodes
//
headers_list = new Linked_list<dict_embedfront_t *>();
nodes_list = new Linked_list<char *> ();
//
// (3) read term_count
//
vocab_file = fopen(VOCAB_FILENAME, "rb");
dict_file = fopen(DICT_EMBEDFRONT_FILENAME, "wb");
fread(&term_count, sizeof(term_count), 1, vocab_file);
dbg_printf("term_count: %lld\n", term_count);
//
// (4) reall all terms, build up the headers and nodes
//
i = 0;
char filled_previously = TRUE;
char new_node = TRUE;
char node_is_full = FALSE, the_end = FALSE;
node_count = 0;
long long total_wasted = 0;
long long terms_start_at = 0;
term[0] = previous_term[0] = '\0';
while (true) {
//
// (4-1) make sure the previous term is filled in properly before read the next term from file
//
if (filled_previously) {
strcpy(previous_term, term);
fread(term, MAX_WORD_LENGTH+1, 1, vocab_file);
i++;
if (i == term_count) {
the_end = TRUE;
}
}
//
// (4-2) create a new header and the new associated node
//
if (new_node) {
//one_header = (dict_embed_t *) malloc(sizeof(*one_header));
one_header = new dict_embedfront_t;
strncpy(one_header->term, term, strlen(term) + 1);
headers_list->append(one_header);
node_count++;
//node_buffer = (char *)malloc(sizeof(*node_buffer)*max_node_size*512);
node_buffer = new char[node_max_size];
nodes_list ->append(node_buffer);
node_ptr = node_buffer;
postings_ptr = postings_buffer;
term_ptr = term_buffer;
node_length = 0;
new_node = FALSE;
node_is_full = FALSE;
previous_term[0] = '\0';
}
//
// (4-3) fill as many terms as possible in the node
//
// only need to store the prefix_count for the first term in the node
if (previous_term[0] == '\0') {
suffix_count = strlen(term);
needed_size = (long long)POSTING_PTR_SIZE + sizeof(suffix_count) + (sizeof(char) * suffix_count);
} else {
find_common_prefix(previous_term, term, &common_prefix_count);
suffix_count = strlen(term) - common_prefix_count;
needed_size = (long long)POSTING_PTR_SIZE + sizeof(common_prefix_count) + sizeof(suffix_count) + (sizeof(char) * suffix_count);
}
// the node length is stored at the last, so need to consider there is enough space left for it
needed_size += sizeof(node_length_t);
// find out how much space is already used in the node
used_size = (postings_ptr - postings_buffer) + (term_ptr - term_buffer);
if ((used_size + needed_size) < node_max_size) {
// fill the postings buffer
postings_ptr += POSTING_PTR_SIZE;
// fill the term buffer
if (previous_term[0] == '\0') {
*term_ptr = suffix_count;
term_ptr++;
memcpy(term_ptr, term, suffix_count);
term_ptr += suffix_count;
} else {
*term_ptr = common_prefix_count;
term_ptr++;
*term_ptr = suffix_count;
term_ptr++;
memcpy(term_ptr, &term[common_prefix_count], suffix_count);
term_ptr += suffix_count;
}
node_length++;
filled_previously = TRUE;
} else {
node_is_full = TRUE;
filled_previously = FALSE;
// the current block is full, need to create a new one
new_node = TRUE;
}
//
// (4-4) the current node is full or no more term to be processed
//
// if node_is_full and the_end happen at the same time, then the last block will not be handled.
// need to take one more iteration to create a new node and full the buffer and then exit.
if (node_is_full || the_end) {
// store the postings in the node
memcpy(node_ptr, postings_buffer, postings_ptr - postings_buffer);
node_ptr += postings_ptr - postings_buffer;
// store the terms in the node
terms_start_at = node_ptr - node_buffer;
memcpy(node_ptr, term_buffer, term_ptr - term_buffer);
node_ptr += term_ptr - term_buffer;
// find out how much space wasted
total_wasted = node_max_size - (node_ptr - node_buffer) - sizeof (node_length_t);
// store node length at the very end of the node
node_ptr = node_buffer + node_max_size - sizeof(node_length_t);
memcpy(node_ptr, &node_length, sizeof(node_length_t));
}
#if 0
if (node_is_full || the_end) {
char term[MAX_WORD_LENGTH+1];
char *node_ptr = node_buffer, *term_ptr;
node_length_t node_length_02;
long long i, j;
uint8_t size;
node_length_02 = *(node_length_t *) (node_buffer + node_max_size - sizeof(node_length_t));
printf("node_legnth: %d, node_legnth_02: %d\n", node_length, node_length_02);
term_ptr = node_buffer + node_length_02 * POSTING_PTR_SIZE;
for (i = 0; i < node_length_02; i++) {
if (i == 0) {
suffix_count = *(uint8_t *)term_ptr;
term_ptr++;
memcpy(term, term_ptr, suffix_count);
term[suffix_count] = '\0';
term_ptr += suffix_count;
} else {
common_prefix_count = *(uint8_t *)term_ptr;
term_ptr++;
suffix_count = *(uint8_t *)term_ptr;
term_ptr++;
memcpy(&term[common_prefix_count], term_ptr, suffix_count);
term[common_prefix_count+suffix_count] = '\0';
term_ptr += suffix_count;
}
printf("term: %s\n", term);
}
}
#endif
if ((the_end) && (filled_previously)) {
break;
}
} //end of while (true)
//
// (5) write node_count and headers to disk
//
dbg_printf("node_count: %u\n", node_count);
dict_embedfront_t *h = NULL;
fwrite(&node_count, sizeof(node_count), 1, dict_file);
for (h = headers_list->first(); h != NULL; h = headers_list->next()) {
fwrite(h->term, strlen(h->term)+1, 1, dict_file);
fwrite(&(h->node_ptr), sizeof(h->node_ptr), 1, dict_file);
}
//
// (6) fill in the gap to make sure nodes starting at the beginning of a sector
//
//long long padding = hd_sector_size - ftell(dict_file) % hd_sector_size;
long long padding = node_max_size - ftell(dict_file) % node_max_size;
total_wasted += padding;
for (i = 0; i < padding; i++) {
fwrite(&one_byte, 1, 1, dict_file);
}
//
// (7) write nodes to disk and update node pointer in headers
//
char *n = NULL;
for (n = nodes_list->first(), h = headers_list->first(); n != NULL; n = nodes_list->next(), h = headers_list->next()) {
h->node_ptr = ftell(dict_file);
fwrite(n, node_max_size, 1, dict_file);
}
//
// (8) re-write node_count and headers to disk
//
fseek(dict_file, 0, SEEK_SET);
fwrite(&node_count, sizeof(node_count), 1, dict_file);
for (h = headers_list->first(); h != NULL; h = headers_list->next()) {
fwrite(h->term, strlen(h->term) + 1, 1, dict_file);
fwrite(&(h->node_ptr), sizeof(h->node_ptr), 1, dict_file);
}
//
// (9) finished
//
printf(" total_wasted: %lld bytes\n", total_wasted);
fseek(dict_file, 0, SEEK_END);
printf(" total file size: %ld\n", ftell(dict_file));
fclose(dict_file);
free(postings_buffer);
free(term_buffer);
delete headers_list;
delete nodes_list;
printf("FINISHED\n\n");
}