22 lines
410 B
C
22 lines
410 B
C
#include "reader.h"
|
|
|
|
#include <ctype.h>
|
|
#include <stddef.h>
|
|
|
|
const expression_t *
|
|
read_expression(memory_pool_t *pool, const char *input, int len)
|
|
{
|
|
expression_t *result = allocate_expression(pool);
|
|
if (NULL == result)
|
|
return NULL;
|
|
result->is_number = true;
|
|
result->number = 0;
|
|
while (isdigit(*input)) {
|
|
result->number *= 10;
|
|
result->number += *input - '0';
|
|
++input;
|
|
++len;
|
|
}
|
|
return result;
|
|
}
|