Trying to build a forth runtime in C
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forth/include/fh_input.h

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1.4 KiB

/**
* TODO file description
*
* Created on 2021/11/21.
*/
#ifndef FORTH_FH_INPUT_H
#define FORTH_FH_INPUT_H
struct fh_thread_s;
struct fh_input_spec_s;
/** Refill the input buffer, returns false on failure / EOF */
typedef bool (*fh_input_refill_t)(struct fh_thread_s *fh, struct fh_input_spec_s *spec);
/** Spec free func */
typedef void (*fh_input_free_t)(void *spec);
struct fh_input_spec_s {
struct fh_input_spec_s *previous;
fh_input_refill_t refill_input_buffer;
fh_input_free_t free_self;
uint32_t linenum;
char *cwd; // CWD of the input, used for relative includes. malloc'd (strdup)
// saved values, filled when pushing
char saved_buffer[INPUT_BUFFER_SIZE];
uint32_t saved_inputptr;
uint32_t saved_inputlen;
uint32_t saved_execptr;
enum fh_state saved_state;
};
/**
* Push current input spec and state, replace with new one
*/
enum fh_error fh_push_input(struct fh_thread_s *fh, struct fh_input_spec_s *newinput);
/**
* Discard current input spec, restore previous.
* fh->input will be NULL if this was the topmost one
*/
enum fh_error fh_pop_input(struct fh_thread_s *fh);
struct fh_input_spec_s *fh_create_input_from_filename(char *path);
struct fh_input_spec_s *fh_create_input_from_filestruct(FILE *f, const char *path);
struct fh_input_spec_s *fh_create_input_from_string(char *str, size_t len, const char *cwd); // cwd is strduped.
void fh_input_teardown(struct fh_thread_s *fh);
#endif //FORTH_FH_INPUT_H