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140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/* header-file for dbf.c
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declares routines for reading and writing xBase-files (.dbf), and
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associated structures
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Maarten Boekhold (boekhold@cindy.et.tudelft.nl) 29 oktober 1995
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*/
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#ifndef _DBF_H
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#define _DBF_H
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#include <sys/types.h>
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/**********************************************************************
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The DBF-part
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***********************************************************************/
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#define DBF_FILE_MODE 0644
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/* byte offsets for date in dbh_date */
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#define DBH_DATE_YEAR 0
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#define DBH_DATE_MONTH 1
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#define DBH_DATE_DAY 2
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/* maximum fieldname-length */
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#define DBF_NAMELEN 11
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/* magic-cookies for the file */
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#define DBH_NORMAL 0x03
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#define DBH_MEMO 0x83
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/* magic-cookies for the fields */
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#define DBF_ERROR -1
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#define DBF_VALID 0x20
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#define DBF_DELETED 0x2A
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/* diskheader */
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typedef struct
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{
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u_char dbh_dbt; /* indentification field */
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u_char dbh_year; /* last modification-date */
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u_char dbh_month;
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u_char dbh_day;
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u_char dbh_records[4]; /* number of records */
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u_char dbh_hlen[2]; /* length of this header */
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u_char dbh_rlen[2]; /* length of a record */
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u_char dbh_stub[20]; /* misc stuff we don't need */
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} dbf_header;
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/* disk field-description */
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typedef struct
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{
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u_char dbf_name[DBF_NAMELEN]; /* field-name terminated with \0 */
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u_char dbf_type; /* field-type */
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u_char dbf_reserved[4]; /* some reserved stuff */
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u_char dbf_flen; /* field-length */
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u_char dbf_dec; /* number of decimal positions if type is
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* 'N' */
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u_char dbf_stub[14]; /* stuff we don't need */
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} dbf_field;
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/* memory field-description */
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typedef struct
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{
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u_char db_name[DBF_NAMELEN]; /* field-name terminated with \0 */
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u_char db_type; /* field-type */
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u_char db_flen; /* field-length */
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u_char db_dec; /* number of decimal positions */
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} f_descr;
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/* memory dfb-header */
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typedef struct
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{
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int db_fd; /* file-descriptor */
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u_long db_offset; /* current offset in file */
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u_char db_memo; /* memo-file present */
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u_char db_year; /* last update as YYMMDD */
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u_char db_month;
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u_char db_day;
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u_long db_hlen; /* length of the diskheader, for
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* calculating the offsets */
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u_long db_records; /* number of records */
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u_long db_currec; /* current record-number starting at 0 */
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u_short db_rlen; /* length of the record */
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u_char db_nfields; /* number of fields */
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u_char *db_buff; /* record-buffer to save malloc()'s */
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f_descr *db_fields; /* pointer to an array of field-
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* descriptions */
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} dbhead;
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/* structure that contains everything a user wants from a field, including
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the contents (in ASCII). Warning! db_flen may be bigger than the actual
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length of db_name! This is because a field doesn't have to be completely
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filled */
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typedef struct
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{
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u_char db_name[DBF_NAMELEN]; /* field-name terminated with \0 */
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u_char db_type; /* field-type */
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u_char db_flen; /* field-length */
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u_char db_dec; /* number of decimal positions */
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u_char *db_contents; /* contents of the field in ASCII */
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} field;
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/* prototypes for functions */
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extern dbhead *dbf_open(u_char *file, int flags);
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extern int dbf_write_head(dbhead * dbh);
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extern int dbf_put_fields(dbhead * dbh);
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extern int dbf_add_field(dbhead * dbh, u_char *name, u_char type,
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u_char length, u_char dec);
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extern dbhead *dbf_open_new(u_char *name, int flags);
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extern void dbf_close(dbhead * dbh);
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extern int dbf_get_record(dbhead * dbh, field * fields, u_long rec);
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extern field *dbf_build_record(dbhead * dbh);
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extern void dbf_free_record(dbhead * dbh, field * fields);
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extern int dbf_put_record(dbhead * dbh, field * rec, u_long where);
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/*********************************************************************
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The endian-part
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***********************************************************************/
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extern long get_long(u_char *cp);
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extern void put_long(u_char *cp, long lval);
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extern short get_short(u_char *cp);
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extern void put_short(u_char *cp, short lval);
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#endif /* _DBF_H */
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