Agilent Technologies E4406A VSA manual Programming Examples, Chapter

Programming Examples

Using C Programming Over Socket LAN (Windows NT)

getopt places in optind the argv index of the next argument to be processed. The external variable optind is initialized to 1 before the first call to the function getopt.

When all options have been processed (i.e., up to the first non-option 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);

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