Партнёры:
Хостинг:
NAME
DtDataTyping, DtDtsLoadDataTypes, DtDtsDataToDataType,
DtDtsFileToDataType, DtDtsFileToAttributeList,
DtDtsFileToAttributeValue , DtDtsBufferToDataType, DtDtsBuf-
ferToAttributeList, DtDtsBufferToAttributeValue, DtDtsData-
TypeToAttributeList, DtDtsDataTypeToAttributeValue,
DtDtsFreeDataType, DtDtsFreeAttributeList, DtDtsFreeAttribu-
teValue, DtDtsRelease, DtDtsDataTypeNames, DtDtsFindAttri-
bute, DtDtsFreeDataTypeNames, DtDtsSetDataType, DtDtsData-
TypeIsAction - Data Typing operations
SYNOPSIS
#include <Dt/Dts.h>
void DtDtsLoadDataTypes(void);
void DtDtsRelease(void);
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);
char *DtDtsFileToDataType(const char *filepath);
char *DtDtsFileToAttributeValue(
const char *filepath,
const char *attr_name);
DtDtsAttribute **DtDtsFileToAttributeList(const char *filepath);
char *DtDtsBufferToDataType(
const void *buffer,
const int size,
const char *opt_name);
char *DtDtsBufferToAttributeValue(
const void *buffer,
const int size,
const char *attr_name,
const char *opt_name);
DtDtsAttribute **DtDtsBufferToAttributeList(
const void *buffer,
const int size,
const char *opt_name);
char *DtDtsDataTypeToAttributeValue(
const char *datatype,
const char *attr_name,
const char *opt_name);
DtDtsAttribute **DtDtsDataTypeToAttributeList(
const char *datatype,
const char *opt_name);
void DtDtsFreeDataTypeNames(char **namelist);
void DtDtsFreeAttributeList(DtDtsAttribute **attr_list);
void DtDtsFreeAttributeValue(char *attr_value);
void DtDtsFreeDataType(char *datatype);
char **DtDtsDataTypeNames(void);
char **DtDtsFindAttribute(
const char *attr_name,
const char *attr_value);
char *DtDtsSetDataType(
const char *filepath,
const char *datatype,
const int override);
int DtDtsDataTypeIsAction(const char *datatype);
Where:
filepath the pathname of file.
buffer a pointer to the buffer of the data to be typed.
size the size of the buffer.
stat_buff the buffer from stat/fstat call for use in typing.
link_path the pathname of the original file that a link points to.
link_stat_buff the buffer from lstat call for use in typing.
opt_name a name that may be associated with a buffer.
datatype a DataType
attr_name a name of an attribute
attr_list a list of attribute/value pairs defined by the DtDtsAttribute
structure.
attr_value a value of an attribute.
namelist a list of datatype names
override If false will not change the value if it is currently set.
DtDtsAttribute is a structure with the following entries:
char *name;
char *value;
AVAILABILITY
_description-of-restriction_
DESCRIPTION
DtDtsDataToDataType, DtDtsDataTypeToAttributeValue and
DtDtsDataTypeToAttributeList are the primary datatyping
functions, the DtDtsFileTo* and DtDtsBufferTo* are conveni-
ence functions to these primary routines.
DtDtsLoadDataTypes Initialize and loads the Database fields
for the DataTyping functions.
DtDtsRelease Releases the data structures and data associ-
ated with the datatype database, generally in preparation
for a reload.
DtDtsFileToDataType Returns datatype name for a given file
path.Note: the file and buffer functions are convenience
functions for this routine and should probably be used for
simplicity. Call DtDtsFreeDataType to release the memory for
the value.
DtDtsFileToAttributeValue returns a data attribute value for
a given file path. Call DtDtsFreeAttributeValue to release
the memory for the returned value
DtDtsFileToAttributeList Returns a NULL terminated array of
pointers of *DtDtAttribute for a given file path. Call
DtDtsFreeAttributeList to release the memory for the
returned value
DtDtsBufferToDataType Returns a data type name for a given
byte stream. Call DtDtsFreeDataType to release the memory
for the returned value. If opt_name is not NULL it will be
used as a psudeo file name in typing.
DtDtsBufferToAttributeValue Returns a data attribute value
for a given byte stream. Call DtDtsFreeAttributeValue to
release the memory for the returned value. If opt_name is
NULL certain attributes will be returned as NULL because the
"filename" components could not be determined.
DtDtsBufferToAttributeList Returns a NULL terminated array
of pointers of *DtDtAttribute for a given byte stream. Call
DtDtsFreeAttributeList to release the memory for the
returned value. If opt_name is NULL certain attributes will
be returned as NULL because the "filename" components could
not be determined.
DtDtsDataToDataType Returns data type for a given set of
data. Call DtDtsFreeDataType to release the memory for the
returned value. Pointer values may be passed as a NULL. If a
pointer value is NULL the system will try and determine the
appropriate value for it only if it is need in doing the
typing.
DtDtsDataTypeToAttributeList Returns a NULL terminated array
of pointers of *DtDtAttribute for a given datatype name.
Call DtDtsFreeAttributeList to release the memory for the
returned value. If opt_name is NULL certain attributes will
be returned as NULL because the "filename" components could
not be determined.
DtDtsDataTypeToAttributeValue Returns the data attribute
value for a given datatype name. Call DtDtsFreeAttribu-
teValue to release the memory for the returned value. If
opt_name is NULL certain attributes will be returned as NULL
because the "filename" components could not be determined.
DtDtsDataTypeNames Returns a list of all available datatypes
that is currently loaded into the DataTypes database. Call
DtDtsFreeDataTypeNames to release the memory for the
returned value
DtDtsFreeDataType Frees the memory of a datatype name.
DtDtsFreeDataTypeNames Frees the memory of a list of data-
type name.
DtDtsFreeAttributeList Frees the memory of an attribute
list.
DtDtsFreeAttributeValue Frees the memory of an attribute
value.
DtDtsFindAttribute Finds the list of datatypes that have the
attribute "name" that equal "value". Call DtDtsFreeData-
TypeNames to release the memory for the returned value
DtDtsSetDataType Sets a datatype on a directory and returns
the current datatype on the object. If unable to set or
retrieve the datatype a NULL is returned.
DtDtsDataTypeIsAction Check if the specified datatype is one
loaded by the action tables.
RETURN VALUES
Pointer See Description.
NULL If no value could be determined.
EXAMPLES
Simple-FileTyping
This example takes a list of files as arguments and deter-
mines the Description of that datatype.
#include <Dt/Dts.h>
#define ATTRIBUTE "DESCRIPTION"
main(int argc, char **argv)
{
char *attribute;
/* load datatypes database */
DtDtsLoadDataTypes();
argv++;
while(*argv) {
/* get attribute for file */
attribute = DtDtsFileToAttributeValue(*argv, ATTRIBUTE);
if(attribute) {
printf("%s: %s0, *argv, attribute);
}
argv++;
}
DtDtsRelease();
exit(0);
}
Simple-DataTyping
This example takes a list of files as arguments and deter-
mines the Description and Actions of for that file.
#include <Dt/Dts.h>
#define ATTRIBUTE1 "DESCRIPTION"
#define ATTRIBUTE2 "ACTIONS"
main(int argc, char **argv)
{
char *attribute;
char *datatype;
/* load datatypes database */
DtDtsLoadDataTypes();
argv++;
while(*argv) {
/* get datatype file file */
datatype = DtDtsFileToDataType(*argv);
/* get first attribute for datatype */
attribute = DtDtsDataTypeToAttributeValue(datatype,
ATTRIBUTE1, *argv);
if(attribute) {
printf("%s for file %s is %s0,
ATTRIBUTE1, *argv, attribute);
}
/* get second attribute for datatype */
attribute = DtDtsDataTypeToAttributeValue(datatype,
ATTRIBUTE2, NULL);
if(attribute) {
printf("%s for file %s is %s0,
ATTRIBUTE2, *argv, attribute);
}
argv++;
}
DtDtsRelease();
exit(0);
}
SEE ALSO
DtActionLabel(3), DtActionDescription(3), DtActionExists(3),
DtActionInvoke(3), dtdtfile(3), DtDndDropRegister(3),
dtcreateaction(1), dttypes(1),
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