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#define PARSE_NULL      0
#define PARSE_OK        1
#define PARSE_INCOMPLETE    2
#define PARSE_ERROR     3
#define PARSE_EOF       4

#define INPUT_CONSOLE       1
#define INPUT_TEXT      2
#define INPUT_FILE      3

    /* Parse A Single Expression */

SEXP R_Parse1File(FILE*, int, int*);
SEXP R_Parse1Buffer(IoBuffer*, int, int*);
SEXP R_Parse1Vector(TextBuffer*, int, int *);

    /* Parse Several Expressions */

SEXP R_ParseFile(FILE*, int, int*);
SEXP R_ParseBuffer(IoBuffer*, int, int*, SEXP);
SEXP R_ParseVector(SEXP, int, int *);