I am new to OpenVMS and am trying to use SYS$FAO for formatting the output, but the function does not return any data in the out buffer and always return 3 in the output length field.
Any help or pointers will be highly appreciated. Please find my below my c code.
#include <lib$routines.h> //code added // for lib$signal
#include <starlet.h> //code added // for RMS function prototypes
#include <stdio.h> //code added // for printf, gets, etc.
#include <string.h> //code added // for strlen
#include <stdlib.h> //code added // for memset
#include <ssdef.h>
#include <devdef.h>
#include <rms.h>
#include <descrip.h>
#include <stsdef.h>
#include <starlet.h>
int main()
{
int status; /* Status of system calls */
int outlen=0; /* Length of output string from $FAO */
//char out_buffer[80]; /* Buffer for $FAO output */
char* out_buffer; /* Buffer for $FAO output */
$DESCRIPTOR(out_desc, out_buffer); /* Descriptor for out_buffer */
$DESCRIPTOR(jones, "Jones");
$DESCRIPTOR(harris, "Harris");
$DESCRIPTOR(wilson, "Wilson");
$DESCRIPTOR(fao_desc, "Unable to locate !3(8AS)!!");
out_buffer = (char*)malloc(sizeof(char)*800);
printf("defined all variables");
status = sys$fao(&fao_desc, /* Control string for $FAO */
&outlen, /* Pointer for length of output string */
&out_desc, /* Descriptor for output buffer */
&jones, /* P1 - ASCII string descriptor */
&harris, /* P2 - ASCII string descriptor */
&wilson); /* P3 - ASCII string descriptor */
printf("sys$fao call is done\n");
/* Immediately signal (and quit) if error occurred */
if ((status & STS$M_SUCCESS) == 0) lib$signal(status);
printf("checked the status returned from sys$fao\n");
printf("Returned Length is %d\n",outlen);
/* FAO directive succeeded, output resultant string */
out_buffer[outlen] = '\0'; /* add string terminator to buffer */
printf("terminated the string \n");
//puts(out_buffer); /* output the result */
printf("out buffer is %s\n",out_buffer);
printf("printed the output on console\n");
free(out_buffer);
return 0;
}
//char out_buffer[80]; /* Buffer for $FAO output */
char* out_buffer; /* Buffer for $FAO output */
$DESCRIPTOR(out_desc, out_buffer); /* Descriptor for out_buffer */
...
out_buffer = (char*)malloc(sizeof(char)*800);
The $DESCRIPTOR macro uses the sizeof() function to fill in the dsc$w_length field, and so is unsuitable for use with char*. If you used the char[] definition of out_buffer, it would have worked.
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