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extern char *get_dbf_record(dbhead_t *dbh, long rec_num);
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extern long put_dbf_record(dbhead_t *dbh, long rec_num, char *cp);
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extern int put_piece(dbhead_t *dbh, long offset, char *cp, int len);
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extern int del_dbf_record(dbhead_t *dbh, long rec_num);
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void pack_dbf(dbhead_t *dbh);
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extern char *get_field_val(char *rp, dbfield_t *fldp, char *cp);
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void put_field_val(char *rp, dbfield_t *fldp, char *cp);
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void out_rec(dbhead_t *dbh, dbfield_t *dbf, char *cp);
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extern int is_valid_rec(char *cp);
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extern char *dbf_get_next(dbhead_t *dbh);