Table of Contents

NAME

SYNOPSIS

DESCRIPTION

The 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 is a pointer to a pointer to the string. The argument is a pointer to a array of pointers to strings. The function returns the zero-based offset of the pointer in the array referencing a string which matches the first token in the string, or, -1 if the string contains no tokens or does not contain a matching string. If the token is of the form ‘‘name=value’’, the location referenced by will be set to point to the start of the ‘‘value’’ portion of the token. On return from 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 will be set to point to the start of the current token, or if no tokens were present. The argument will be set to point to the ‘‘value’’ portion of the token, or 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

HISTORY

The function is

Table of Contents