int getsubopt(char **optionp, char *tokens[], char **valuep);

extern char *suboptarg;
 DESCRIPTION
 Getsubopt parses a string containing tokens delimited by one or more tab, space or
comma (``,'') characters.
It is intended for use in parsing groups of option arguments provided
as part of a utility command line.

 Optionp is a pointer to a pointer to the string.
 Tokens is a pointer to a NULL-terminated array of pointers to strings.

 Getsubopt returns the zero-based offset of the pointer in the
 tokens array referencing a string which matches the first token
in the string, or, -1 if the string contains no tokens or
 tokens does not contain a matching string.

If the token is of the form ``name=value'', the location referenced by
 valuep will be set to point to the start of the ``value'' portion of the token.

On return from
 getsubopt ,  optionp will be set to point to the start of the next token in the string,
or the null at the end of the string if no more tokens are present.
The external variable
 suboptarg will be set to point to the start of the current token, or NULL if no
tokens were present.
 Valuep will be set to point to the ``value'' portion of the token, or NULL
if no ``value'' portion was present.
 EXAMPLE

char *tokens[] = {
 #define ONE 0
 "one",
 #define TWO 1
 "two",
 NULL
};

...

extern char *optarg, *suboptarg;
char *options, *value;

while ((ch = getopt(argc, argv, "ab:")) != -1) {
 switch(ch) {
 case 'a':
 /* process ``a'' option */
 break;
 case 'b':
 options = optarg;
 while (*options) {
 switch(getsubopt(&options, tokens, &value)) {
 case ONE:
 /* process ``one'' sub option */
 break;
 case TWO:
 /* process ``two'' sub option */
 if (!value)
 error("no value for two");
 i = atoi(value);
 break;
 case -1:
 if (suboptarg)
 error("illegal sub option %s",
 suboptarg);
 else
 error("missing sub option");
 break;
 }
 break;
 }

 SEE ALSO
getopt(3), strsep(3)