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.help mctable Aug89
Multicolumn Table Handler.
This package contains routines to handle a contiguous memory buffer as a
table with one or more columns. The number of columns is fixed at creation
time, but the number of rows can increase dynamicaly if needed. The table
data type is fixed at creation time as well.
.sp
This package makes a distinction between the physical and logical size of
the table. The first one is the amount of memory allocated to the table, and
can increase if more space is needed. The physical size of a table can
increase dinamycaly when entering data and can decrease up to the logical
size unless the table is freed.
The logical size is the amount of memory used by the data in the table,
and is always less or equal to the physical size. The logical size of a
table can also increase dinamycaly when entering data, and is zero
if no data have been entered.
.sp
The procedures mct_maxrow() and mct_maxcol() return the amount of physical
memory used by the table, and the procedures mct_nrows() and mct_ncols() return
the highest row and column (in the highest row) used by the data in the table,
i.e. the logical size.
.sp
The physical size can be reduced up to the logical size with the mct_shrink()
procedure. This returns to the system any unused memory used by the table.
This procedures should ne used with tables that are not intended to grow
anymore.
.sp
The logical size can be set to zero with the mct_reset() procedure. This
procedure clears all the counters used to keep track of the logical size
of the table, and also fills all the physical memory with INDEF values.
.sp
The mct_clear() procedure fills all the physical memory with a specified
value, but does not modify the logical size of the table.
.sp
It is possible to enter data into the table either sequentially, randomly,
or a combination of both. The mct_put() procedures enter data randomly into
the table at given row and column. The mct_sput() procedures enter data
sequentially into the table after the highest row and column, i.e., they
start after the last element in table, increasing the logical size by one
element. The physical size is increased automaticaly if needed.
.sp
Data can be retrieved from the table as a pointer to the whole data buffer,
a pointer to a single row, randomly, or sequentially. The mct_getbuf() returns
a pointer to the data buffer, the mct_getrow() returns a pointer to the
beginning of a given row, the mct_get() procedures return a single data
value for a given row and column, and the mct_sget() procedures return the
next single data value. Sequential retrieval starts from the last retrieval
made, either sequential or ramdom. The mct_rew() procedure can be used to
reset the sequential retrieval counters.
.sp
A table can be saved into a file and restored later with the mct_save() and
mct_restore() procedures. These procedures use the file name instead of a
file descriptor. When saving only the WRITE_ONLY, READ_WRITE, NEW_FILE, and
TEMP_FILE file modes are allowed.
.sp
.nf
Entry points:
mct_alloc (table, nrows, ncols, type) Allocate table space
mct_free (table) Free table space
mct_shrink (table) Free unused memory
mct_copy (itable, otable) Copy table
mct_save (fname, fmode, table) Save table to file
mct_restore (fname, table) Restore table from file
mct_rew (table) Reset seq. (get) counters
mct_reset (table) Reset all table counters
mct_clear[csilrdxp] (table, value) Clear table with value
nrows = mct_nrows (table) Return highest row used
ncols = mct_ncols (table) Return highest col. used
nrow = mct_maxrow (table) Return max. number of rows
ncols = mct_maxcol (table) Return max. number of col.
type = mct_type (table) Return table type
pval = mct_getbuf (table) Get buffer pointer
pval = mct_getrow (table, row) Get row pointer
value = mct_get[csilrdxp] (table, row, col) Get value randomly
mct_put[csilrdxp] (table, row, col, value) Put value randomly
mct_sput[csilrdxp] (table, value) Put value sequentially
stat = mct_sget[csilrdxp] (table, value) Get value sequentially
.fi
.endhelp
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