DtDtsDataToDataTypUNIX System V (1 August 1DtDtsDataToDataType(3)
NAME
DtDtsDataToDataType - get the data type for a set of data
SYNOPSIS
#include <Dt/Dts.h>
char *DtDtsDataToDataType(const char *filepath,
const void *buffer,
const int size,
const struct stat *stat_buff,
const char *link_path,
const struct stat *link_stat_buff,
const char *opt_name);
DESCRIPTION
The DtDtsDataToDataType() function determines the data type
of a set of data, based on the information given in the
non-NULL pointer arguments to the function. The function
gathers any additional information, if it is needed, to
compensate for the NULL arguments. For example, if the
filepath argument is given, but the stat_buff argument is
NULL and a stat_buff value is required to determine the data
type, DtDtsDataToDataType() calls the stat(2) function to
obtain the information.
The filepath argument is the pathname of a file.
The buffer argument is a pointer to the buffer of the data
to be typed.
The size argument is the size of the buffer in bytes.
The stat_buff argument is the buffer returned from a stat(2)
or fstat(3) call for use in typing.
The link_path argument is the pathname of the target file
pointed to by a symbolic link.
The link_stat_buff argument is the buffer returned from an
lstat(2) call for use in typing.
The opt_name argument can be used to specify a name to be
associated with the buffer. If the opt_name argument is not
NULL, it is used as a pseudo file name in typing; otherwise,
certain attributes may be returned as NULL because the
filename components could not be determined.
RETURN VALUE
Upon successful completion, the DtDtsDataToDataType()
function returns a pointer to a data type string, or NULL if
no value could be determined.
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DtDtsDataToDataTypUNIX System V (1 August 1DtDtsDataToDataType(3)
APPLICATION USAGE
The DtDtsDataToDataType() function is generally used by
applications such as file managers to improve performance.
Typical applications should probably use
DtDtsFileToDataType(3) or DtDtsBufferToDataType(3) instead.
The DtDtsBuffer* functions assume that the buffer is
readable and writable by the user, group and other file
classes and select a type accordingly. An application
requiring a type based on read-only permissions should use
DtDtsDataToDataType() with a stat_buff value created for
this purpose: all fields should NULL except for the st_mode
field, which should be set to:
S_IFREG | S_IROTH | S_IRGRP | S_IRUSR
SEE ALSO
DtDts(5), DtDtsLoadDataTypes(3), DtDtsFileToDataType(3),
DtDtsBufferToDataType(3), fstat(3), lstat(2), stat(2).
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