Agilent Technologies E8257C Programming Guide

100 Chapter 2
Programming Examples
LAN Programming Examples
argument), getopt returns EOF. The special option -- can be used to
delimit the end of the options; EOF is returned, and -- is skipped.
***************************************************************************/
#include <stdio.h> /* For NULL, EOF */
#include <string.h> /* For strchr() */
char *optarg; /* Global argument pointer. */
int optind = 0; /* Global argv index. */
static char *scan = NULL; /* Private scan pointer. */
int getopt( int argc, char * const argv[], const char* optstring)
{
char c;
char *posn;
optarg = NULL;
if (scan == NULL || *scan == '\0') {
if (optind == 0)
optind++;
if (optind >= argc || argv[optind][0] != '-' || argv[optind][1] == '\0')
return(EOF);
if (strcmp(argv[optind], "--")==0) {
optind++;
return(EOF);
}

Agilent Technologies E8257C Specifications

General

Modulation Types	AM, FM, PM, Pulse
Output Impedance	50 Ohms
Frequency Resolution	0.001 Hz
Amplitude Accuracy	±0.5 dB
Harmonics	-30 dBc
Power Requirements	100-240 VAC, 50/60 Hz
Subharmonics	-60 dBc