The following sample C program, ZFLDATA, dynamically queries
the DSName for a passed-in DDName. The PL/I sample program in Related
References illustrates the call to this C program to query the DSName
for the SYSXMLSD DDName for error feedback.
As part of the processing,
TMPLT00 calls
a C routine called ZFLDATA. This routine has a single purpose. It
takes a data set DD name, and if possible, it will return the dataset
name that the DD name refers to. The source for ZFLDATA is listed
below.
#include <stdio.h>
#include <string.h>
#define FILENAMEMAX 255
#define ATTRMAX 100
int main(void)
{
FILE *stream;
char dsn[FILENAMEMAX];
char filename[FILENAMEMAX];
char fileattrs[ATTRMAX];
int rc;
int getFileData(char * dsn, char * filename, char * fileattrs);
memset(filename ,'\0',sizeof(filename));
memset(filename ,'\0',sizeof(fileattrs));
memcpy(filename ,"DD:SYSXMLSD",sizeof("DD:SYSXMLSD"));
memcpy(fileattrs ,"a+",
sizeof("a+"));
rc = ZFLDATA(dsn,filename,fileattrs);
if (rc != 0)
printf("fldata failed\n");
else
printf("filename is %s\n",dsn);
}
int ZFLDATA(char * dsn, char *fn, char *fileattrs)
{
fldata_t fileinfo;
fldata_t * fileinfoptr;
int rc;
FILE *stream;
/******************************************************/
/*Get a stream for the file and attributes passed in */
/******************************************************/
stream = fopen(fn,fileattrs);
if (stream == NULL)
{
perror("***FAILURE OPENING FILE*****");
}
/******************************************************/
/*Get the actual dataset name on DASD from fldata */
/******************************************************/
memset(dsn ,'\0',
sizeof(dsn));
fileinfoptr = &fileinfo;
rc = fldata(stream, dsn, &fileinfo;);
if (rc != 0)
{
printf("fldata failed\n");
}
else
{
memcpy (dsn,
fileinfoptr->__dsname,
strlen(fileinfoptr->__dsname));
}
fclose(stream);
return rc;
}