int main(int argc, const char *argv[])
{
#ifdef DB
fp = fopen("input.txt", "r");
#endif
int i;
int ch;
while ((ch = getchar()) != EOF) {
/* expr end with var not operator,
* add '+' to make them pairs */
expr[0] = '+';
expr[1] = (char)ch;
/* start from idx 2 */
for (i = 2; (ch = getchar()) != '\n'; i++) {
expr[i] = (char)ch;
}
expr[i] = '\0';
p = expr + 1; /* skip to the adding '+' */
printf("Expression: %s\n", p);
alpha_init();
inc_dec_2_spc();
p = expr;
total = 0;
expression();
printf(" value = %d\n", total);
for (i = 0; i < 26; i++) {
if (alpha[i].used) {
printf(" %c = %d\n",
i + 0x61,
alpha[i].val + alpha[i].inc_dec);
}
}
}
return 0;
}
int get_alpha_size(int alpha)
{
if (alpha_tables == NULL)
if (!alpha_init(-1))
return -1;
if (alpha < 1 || alpha >= table_size) {
fprintf(stderr, "Error: The program is using an invalid alphabet.\n");
return -1;
}
if (alpha_tables[alpha].init_flag == UNINITIALIZED)
if (!alpha_init(alpha))
return -1;
if (alpha_tables[alpha].init_flag == UNUSED) {
fprintf(stderr, "Error: The program is using an invalid alphabet.\n");
return -1;
}
return alpha_tables[alpha].alpha_size;
}
char rawmapchar(int alpha, char ch)
{
if (alpha_tables == NULL)
if (!alpha_init(-1))
return -1;
if (alpha < 1 || alpha >= table_size) {
fprintf(stderr, "Error: The program is using an invalid alphabet.\n");
return -1;
}
if (alpha_tables[alpha].init_flag == UNINITIALIZED)
if (!alpha_init(alpha))
return -1;
if (alpha_tables[alpha].init_flag == UNUSED) {
fprintf(stderr, "Error: The program is using an invalid alphabet.\n");
return -1;
}
return alpha_tables[alpha].rawmap[(int) ch];
}
int add_alphabet(char *characters)
{
int i, j, alpha;
char *s;
ALPHABET *tptr;
if (alpha_tables == NULL)
if (!alpha_init(-1))
return -1;
for (alpha=1; alpha < table_size; alpha++)
if (alpha_tables[alpha].init_flag == UNUSED)
break;
if (alpha == table_size) {
table_size += table_size;
if ((alpha_tables = realloc(alpha_tables,
table_size * sizeof(ALPHABET))) == NULL) {
fprintf(stderr, "Ran out of memory. Cannot create new alphabet.\n");
return -1;
}
for (i=alpha; i < table_size; i++)
alpha_tables[i].init_flag = UNUSED;
}
tptr = &alpha_tables[alpha];
for (i=0; i < 128; i++) {
tptr->rawmap[i] = 0;
tptr->map[i] = -1;
}
for (s=characters; *s; s++)
tptr->rawmap[(int) *s] = *s;
for (i=0,j=0; i < 128; i++)
if (tptr->rawmap[i] != '\0')
tptr->map[i] = (char) j++;
tptr->alpha_size = j;
tptr->init_flag = INITIALIZED;
return alpha;
}
