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33 .Nd get sub options from an argument
38 .Vt extern char *suboptarg ;
40 .Fn getsubopt "char **optionp" "char * const *tokens" "char **valuep"
45 parses a string containing tokens delimited by one or more tab, space or
49 It is intended for use in parsing groups of option arguments provided
50 as part of a utility command line.
54 is a pointer to a pointer to the string.
58 .Dv NULL Ns -terminated
59 array of pointers to strings.
64 returns the zero-based offset of the pointer in the
66 array referencing a string which matches the first token
67 in the string, or, \-1 if the string contains no tokens or
69 does not contain a matching string.
71 If the token is of the form ``name=value'', the location referenced by
73 will be set to point to the start of the ``value'' portion of the token.
78 will be set to point to the start of the next token in the string,
79 or the null at the end of the string if no more tokens are present.
82 will be set to point to the start of the current token, or
88 will be set to point to the ``value'' portion of the token, or
90 if no ``value'' portion was present.
103 extern char *optarg, *suboptarg;
104 char *options, *value;
106 while ((ch = getopt(argc, argv, "ab:")) != \-1) {
109 /* process ``a'' option */
114 switch(getsubopt(&options, tokens, &value)) {
116 /* process ``one'' sub option */
119 /* process ``two'' sub option */
121 error("no value for two");
126 error("illegal sub option %s",
129 error("missing sub option");
143 function first appeared in