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#include "db.h"
#include <stdio.h> /* for fopen(), etc. */
#include <errno.h> /* for strerror(), etc. */
#include <string.h> /* for strncmp(), etc. */
#include <stdint.h> /* for uint32_t */
#include <stdlib.h> /* for atoi() */
#include "dict.h"
char db_err[256];
static uint64_t dbHash(const void *key)
{
return dictGenHashFunction(key,8);
}
static int dbKeyCompare(void *privdata, const void *key1, const void *key2)
{
return memcmp(key1,key2,8) == 0;
}
static void dbFree(void *privdata, void *val)
{
free(val);
}
static dictType titleDB = {
dbHash,
NULL,
NULL,
dbKeyCompare,
dbFree,
dbFree
};
/* Add a bank to the database.
*
* Returns 0 on success, -1 on error. */
int add_bank(dict *db, const char name[4], uint32_t id, dbval *data)
{
uint32_t *buf = malloc(sizeof(uint32_t)*2);
memcpy(buf,name,4);
buf[1] = id;
if (dictAdd(db, buf, data) != DICT_OK) {
sprintf(db_err, "failed to add bank to database!\n");
goto err;
}
return 0;
err:
free(buf);
return -1;
}
/* Get a bank from the database.
*
* Returns a pointer to the first value in the bank, or NULL if the bank
* doesn't exist. */
dbval *get_bank(dict *db, const char name[4], uint32_t id)
{
uint32_t buf[2];
memcpy(buf,name,4);
buf[1] = id;
return dictFetchValue(db, buf);
}
/* Function to iterate over the fields in a title bank text file. Works sort of
* like strtok(). Example:
*
* char *item = iter_field(line);
* while (item) {
* // do something with item
* item = iter_field(NULL);
* }
*/
static char *iter_field(char *str)
{
static char *ptr;
static char buf[81];
if (!str) str = ptr;
ptr = buf;
while (*str != '\x0' && ptr < (buf + 81)) {
if (ptr == (buf + 2) && buf[0] == '#' && buf[1] == '.') {
ptr = buf;
while (*str != '\x0' && *str++ != '#');
continue;
}
if (*str == ' ' || *str == '\n') {
str++;
if (ptr == buf) continue;
break;
}
*ptr++ = *str++;
}
if (ptr == buf) return NULL;
*ptr = '\x0';
ptr = str;
return buf;
}
/* Create a new database. */
dict *db_init(void)
{
dict *db = dictCreate(&titleDB, NULL);
return db;
}
/* Free a database. */
void db_free(dict *db)
{
dictRelease(db);
}
/* Load a title bank file into the database `db`.
*
* Returns 0 on success, -1 on error. */
int load_file(dict *db, const char *filename)
{
int i, index;
char *item, *s;
char line[256];
char idh[4];
uint32_t idn;
int mul;
int64_t value;
double float_value;
dbval *buf;
int buf_size;
buf_size = 10;
buf = malloc(buf_size*sizeof(dbval));
if (!buf) {
strcpy(db_err,strerror(errno));
return -1;
}
FILE *f = fopen(filename, "r");
if (!f) {
sprintf(db_err, "unable to open file '%s': %s", filename, strerror(errno));
return -1;
}
index = 0;
while (fgets(line, sizeof(line), f)) {
if (!strncmp(line,"*---",4)) {
/* Comment. */
continue;
} else if (!strncmp(line,"*.--",4)) {
/* Comment. */
continue;
} else if (!strncmp(line, "*LOG",4)) {
/* Control line which we don't care about. */
continue;
} else if (!strncmp(line, "*PRI",4)) {
/* Control line which we don't care about. */
continue;
} else if (!strncmp(line, "*US",3)) {
/* Control line which we don't care about. */
continue;
} else if (!strncmp(line, "*KI",3)) {
/* Control line which we don't care about. */
continue;
} else if (!strncmp(line, "*ANYWAY",7)) {
/* Control line which we don't care about. */
continue;
} else if (!strncmp(line, "*FIN",4)) {
/* Control line which we don't care about. */
continue;
} else if (!strncmp(line, "*DO",3)) {
if (index > 0) {
/* Save previous bank. */
buf = realloc(buf,sizeof(dbval)*index);
if (add_bank(db, idh, idn, buf) == DICT_ERR) {
sprintf(db_err, "bank '%.4s' already exists in the database", idh);
goto err;
}
buf_size = 10;
buf = malloc(buf_size*sizeof(dbval));
index = 0;
}
item = iter_field(line);
item = iter_field(NULL);
strncpy(idh,item,4);
item = iter_field(NULL);
idn = atoi(item);
continue;
}
item = iter_field(line);
while (item) {
mul = 1;
if ((s = strchr(item,'*'))) {
*s = '\0';
mul = atoi(item);
item = s+1;
}
while (buf_size < (index+mul)*sizeof(dbval)) {
buf_size *= 2;
buf = realloc(buf, buf_size*sizeof(dbval));
}
if (!strncmp(item,"#x",2)) {
/* Hexadecimal input. */
value = strtol(item+2,NULL,16);
for (i = 0; i < mul; i++) buf[index++].u32 = value;
} else if (strchr(item,'E') || strchr(item,'.')) {
/* Floating point input. */
float_value = strtod(item,NULL);
for (i = 0; i < mul; i++) buf[index++].f = float_value;
} else {
/* Assume it's an integer. */
value = strtol(item,NULL,10);
for (i = 0; i < mul; i++) buf[index++].u32 = value;
}
item = iter_field(NULL);
}
}
buf = realloc(buf,sizeof(dbval)*index);
if (add_bank(db, idh, idn, buf) == DICT_ERR) {
sprintf(db_err, "bank '%.4s' already exists in the database", idh);
goto err;
}
fclose(f);
return 0;
err:
if (buf) free(buf);
fclose(f);
return -1;
}
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