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getsubopt.0
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GETSUBOPT(3) UNIX Programmer's Manual GETSUBOPT(3)
NNAAMMEE
ggeettssuubboopptt - get sub options from an argument
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssttddiioo..hh>>
_i_n_t
ggeettssuubboopptt(_c_h_a_r _*_*_o_p_t_i_o_n_p, _c_h_a_r _* _c_o_n_s_t _*_t_o_k_e_n_s, _c_h_a_r _*_*_v_a_l_u_e_p)
DDEESSCCRRIIPPTTIIOONN
The ggeettssuubboopptt() 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.
The argument _o_p_t_i_o_n_p is a pointer to a pointer to the string. The argu
ment _t_o_k_e_n_s is a pointer to a NULLterminated array of pointers to
strings.
The ggeettssuubboopptt() function returns the zerobased offset of the pointer in
the _t_o_k_e_n_s array referencing a string which matches the first token in
the string, or, -1 if the string contains no tokens or _t_o_k_e_n_s does not
contain a matching string.
If the token is of the form ``name=value'', the location referenced by
_v_a_l_u_e_p will be set to point to the start of the ``value'' portion of the
token.
On return from ggeettssuubboopptt(), _o_p_t_i_o_n_p 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 _s_u_b_o_p_t_a_r_g will be set to
point to the start of the current token, or NULL if no tokens were pre
sent. The argument _v_a_l_u_e_p will be set to point to the ``value'' portion
of the token, or NULL if no ``value'' portion was present.
EEXXAAMMPPLLEE
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;
}
SSEEEE AALLSSOO
getopt(3), strsep(3)
HHIISSTTOORRYY
The ggeettssuubboopptt() function is currently under development.
BSD Experimental July 31, 1991 2