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https://github.com/edeproject/ede.git
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467 lines
16 KiB
C
467 lines
16 KiB
C
/* This version of `getopt' appears to the caller like standard Unix getopt()
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but it behaves differently for the user, since it allows the user
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to intersperse the options with the other arguments.
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As getopt() works, it permutes the elements of `argv' so that,
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when it is done, all the options precede everything else. Thus
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all application programs are extended to handle flexible argument order.
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Setting the environment variable _POSIX_OPTION_ORDER disables permutation.
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Then the behavior is completely standard.
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GNU application programs can use a third alternative mode in which
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they can distinguish the relative order of options and other arguments.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "getoptx.h"
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/* Note that on some systems, the header files above declare variables
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for use with their native getopt facilities, and those variables have
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the same names as we'd like to use. So we use things like optargx
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instead of optarg to avoid the collision.
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*/
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/* For communication from `getopt' to the caller.
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When `getopt' finds an option that takes an argument,
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the argument value is returned here.
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*/
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static char *optargx = 0;
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/* Index in ARGV of the next element to be scanned.
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This is used for communication to and from the caller
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and for communication between successive calls to getoptx().
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On entry to getoptx(), zero means this is the first call; initialize.
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When getoptx() returns EOF, this is the index of the first of the
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non-option elements that the caller should itself scan.
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Otherwise, `optindx' communicates from one call to the next
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how much of ARGV has been scanned so far.
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*/
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static int optindx = 0;
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/* The next char to be scanned in the option-element
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in which the last option character we returned was found.
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This allows us to pick up the scan where we left off.
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If this is zero, or a null string, it means resume the scan
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by advancing to the next ARGV-element. */
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static char *nextchar;
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/* Callers store zero here to inhibit the error message
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for unrecognized options.
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*/
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static int opterrx;
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/* Index in _GETOPT_LONG_OPTIONS of the long-named option actually found.
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Only valid when a long-named option was found. */
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static int option_index;
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struct optionx * _getopt_long_options;
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/* Handle permutation of arguments. */
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/* Describe the part of ARGV that contains non-options that have
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been skipped. `first_nonopt' is the index in ARGV of the first of them;
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`last_nonopt' is the index after the last of them. */
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static int first_nonopt;
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static int last_nonopt;
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/* Exchange two adjacent subsequences of ARGV.
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One subsequence is elements [first_nonopt,last_nonopt)
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which contains all the non-options that have been skipped so far.
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The other is elements [last_nonopt,optindx), which contains all
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the options processed since those non-options were skipped.
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`first_nonopt' and `last_nonopt' are relocated so that they describe
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the new indices of the non-options in ARGV after they are moved. */
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static void
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exchange(char ** const argv) {
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unsigned int const nonopts_size =
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(last_nonopt - first_nonopt) * sizeof (char *);
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char **temp = (char **) malloc (nonopts_size);
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if (temp == NULL)
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abort();
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/* Interchange the two blocks of data in argv. */
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memcpy (temp, &argv[first_nonopt], nonopts_size);
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memcpy (&argv[first_nonopt], &argv[last_nonopt],
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(optindx - last_nonopt) * sizeof (char *));
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memcpy (&argv[first_nonopt + optindx - last_nonopt], temp,
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nonopts_size);
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/* Update records for the slots the non-options now occupy. */
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first_nonopt += (optindx - last_nonopt);
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last_nonopt = optindx;
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free(temp);
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}
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/* Scan elements of ARGV (whose length is ARGC) for option characters
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given in OPTSTRING.
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If an element of ARGV starts with '-', and is not exactly "-" or "--",
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then it is an option element. The characters of this element
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(aside from the initial '-') are option characters. If getoptx()
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is called repeatedly, it returns successively each of the option characters
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from each of the option elements.
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If getoptx() finds another option character, it returns that character,
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updating `optindx' and `nextchar' so that the next call to getoptx() can
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resume the scan with the following option character or ARGV-element.
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If there are no more option characters, getoptx() returns `EOF'.
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Then `optindx' is the index in ARGV of the first ARGV-element
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that is not an option. (The ARGV-elements have been permuted
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so that those that are not options now come last.)
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OPTSTRING is a string containing the legitimate option characters.
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If an option character is seen that is not listed in OPTSTRING,
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return '?' after printing an error message. If you set `opterrx' to
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zero, the error message is suppressed but we still return '?'.
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If a char in OPTSTRING is followed by a colon, that means it wants an arg,
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so the following text in the same ARGV-element, or the text of the following
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ARGV-element, is returned in `optargx'. Two colons mean an option that
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wants an optional arg; if there is text in the current ARGV-element,
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it is returned in `optargx', otherwise `optargx' is set to zero.
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If OPTSTRING starts with `-', it requests a different method of handling the
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non-option ARGV-elements. See the comments about RETURN_IN_ORDER, above.
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Long-named options begin with `+' instead of `-'.
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Their names may be abbreviated as long as the abbreviation is unique
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or is an exact match for some defined option. If they have an
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argument, it follows the option name in the same ARGV-element, separated
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from the option name by a `=', or else the in next ARGV-element.
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getoptx() returns 0 when it finds a long-named option. */
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static int
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getoptx(int const argc,
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char ** const argv,
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const char * const optstring) {
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optargx = 0;
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/* Initialize the internal data when the first call is made.
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Start processing options with ARGV-element 1 (since ARGV-element 0
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is the program name); the sequence of previously skipped
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non-option ARGV-elements is empty. */
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if (optindx == 0)
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{
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first_nonopt = last_nonopt = optindx = 1;
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nextchar = 0;
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}
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if (nextchar == 0 || *nextchar == 0)
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{
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/* If we have just processed some options following some non-options,
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exchange them so that the options come first. */
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if (first_nonopt != last_nonopt && last_nonopt != optindx)
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exchange (argv);
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else if (last_nonopt != optindx)
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first_nonopt = optindx;
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/* Now skip any additional non-options
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and extend the range of non-options previously skipped. */
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while (optindx < argc
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&& (argv[optindx][0] != '-'|| argv[optindx][1] == 0)
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&& (argv[optindx][0] != '+'|| argv[optindx][1] == 0))
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optindx++;
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last_nonopt = optindx;
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/* Special ARGV-element `--' means premature end of options.
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Skip it like a null option,
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then exchange with previous non-options as if it were an option,
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then skip everything else like a non-option. */
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if (optindx != argc && !strcmp (argv[optindx], "--"))
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{
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optindx++;
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if (first_nonopt != last_nonopt && last_nonopt != optindx)
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exchange (argv);
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else if (first_nonopt == last_nonopt)
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first_nonopt = optindx;
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last_nonopt = argc;
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optindx = argc;
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}
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/* If we have done all the ARGV-elements, stop the scan
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and back over any non-options that we skipped and permuted. */
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if (optindx == argc)
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{
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/* Set the next-arg-index to point at the non-options
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that we previously skipped, so the caller will digest them. */
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if (first_nonopt != last_nonopt)
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optindx = first_nonopt;
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return EOF;
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}
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/* If we have come to a non-option and did not permute it,
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either stop the scan or describe it to the caller and pass
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it by.
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*/
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if ((argv[optindx][0] != '-' || argv[optindx][1] == 0)
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&& (argv[optindx][0] != '+' || argv[optindx][1] == 0))
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{
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optargx = argv[optindx++];
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return 1;
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}
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/* We have found another option-ARGV-element.
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Start decoding its characters. */
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nextchar = argv[optindx] + 1;
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}
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if ((argv[optindx][0] == '+' || (argv[optindx][0] == '-'))
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)
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{
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struct optionx *p;
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char *s = nextchar;
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int exact = 0;
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int ambig = 0;
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struct optionx * pfound;
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int indfound;
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while (*s && *s != '=') s++;
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indfound = 0; /* quite compiler warning */
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/* Test all options for either exact match or abbreviated matches. */
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for (p = _getopt_long_options, option_index = 0, pfound = NULL;
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p->name;
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p++, option_index++)
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if (!strncmp (p->name, nextchar, s - nextchar))
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{
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if ((unsigned int)(s - nextchar) == strlen (p->name))
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{
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/* Exact match found. */
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pfound = p;
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indfound = option_index;
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exact = 1;
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break;
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}
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else if (!pfound)
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{
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/* First nonexact match found. */
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pfound = p;
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indfound = option_index;
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}
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else
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/* Second nonexact match found. */
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ambig = 1;
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}
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if (ambig && !exact)
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{
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fprintf (stderr, "%s: option `%s' is ambiguous\n",
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argv[0], argv[optindx]);
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nextchar += strlen (nextchar);
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return '?';
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}
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if (pfound)
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{
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option_index = indfound;
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optindx++;
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if (*s)
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{
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if (pfound->has_arg > 0)
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optargx = s + 1;
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else
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{
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fprintf (stderr,
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"%s: option `%c%s' doesn't allow an argument\n",
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argv[0], argv[optindx - 1][0], pfound->name);
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nextchar += strlen (nextchar);
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return '?';
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}
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}
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else if (pfound->has_arg)
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{
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if (optindx < argc)
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optargx = argv[optindx++];
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else if (pfound->has_arg != 2)
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{
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fprintf (stderr, "%s: option `%s' requires an argument\n",
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argv[0], argv[optindx - 1]);
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nextchar += strlen (nextchar);
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return '?';
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}
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}
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nextchar += strlen (nextchar);
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if (pfound->flag)
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*(pfound->flag) = pfound->val;
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return 0;
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}
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if (argv[optindx][0] == '+' || strchr (optstring, *nextchar) == 0)
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{
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if (opterrx != 0)
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fprintf (stderr, "%s: unrecognized option `%c%s'\n",
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argv[0], argv[optindx][0], nextchar);
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nextchar += strlen (nextchar);
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return '?';
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}
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}
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/* Look at and handle the next option-character. */
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{
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char c = *nextchar++;
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char *temp = strchr (optstring, c);
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/* Increment `optindx' when we start to process its last character. */
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if (*nextchar == 0)
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optindx++;
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if (temp == 0 || c == ':')
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{
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if (opterrx != 0)
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{
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if (c < 040 || c >= 0177)
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fprintf (stderr, "%s: unrecognized option, "
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"character code 0%o\n",
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argv[0], c);
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else
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fprintf (stderr, "%s: unrecognized option `-%c'\n",
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argv[0], c);
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}
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return '?';
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}
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if (temp[1] == ':')
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{
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if (temp[2] == ':')
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{
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/* This is an option that accepts an argument optionally. */
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if (*nextchar != 0)
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{
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optargx = nextchar;
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optindx++;
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}
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else
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optargx = 0;
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nextchar = 0;
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}
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else
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{
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/* This is an option that requires an argument. */
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if (*nextchar != 0)
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{
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optargx = nextchar;
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/* If we end this ARGV-element by taking the rest
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as an arg, we must advance to the next element
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now.
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*/
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optindx++;
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}
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else if (optindx == argc)
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{
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if (opterrx != 0)
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fprintf (stderr,
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"%s: option `-%c' requires an argument\n",
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argv[0], c);
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c = '?';
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}
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else
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/* We already incremented `optindx' once;
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increment it again when taking next ARGV-elt as
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argument.
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*/
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optargx = argv[optindx++];
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nextchar = 0;
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}
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}
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return c;
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}
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}
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void
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getopt_long_onlyx(int const argc,
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char ** const argv,
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const char * const options,
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struct optionx * const long_options,
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unsigned int * const opt_index,
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int const opterrArg,
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int * const end_of_options,
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const char ** const optarg_arg,
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const char ** const unrecognized_option) {
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int rc;
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opterrx = opterrArg;
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_getopt_long_options = long_options;
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rc = getoptx(argc, argv, options);
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if (rc == 0)
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*opt_index = option_index;
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if (rc == '?')
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*unrecognized_option = argv[optindx];
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else
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*unrecognized_option = NULL;
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if (rc < 0)
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*end_of_options = 1;
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else
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*end_of_options = 0;
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*optarg_arg = optargx;
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}
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unsigned int
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getopt_argstart(void) {
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/*----------------------------------------------------------------------------
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This is a replacement for what traditional getopt does with global
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variables.
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You call this after getopt_long_onlyx() has returned "end of
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options"
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-----------------------------------------------------------------------------*/
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return optindx;
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}
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/* Getopt for GNU.
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Copyright (C) 1987, 1989 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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