700 lines
21 KiB
C
700 lines
21 KiB
C
/* Getopt for GNU.
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NOTE: getopt is now part of the C library, so if you don't know what
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"Keep this file name-space clean" means, talk to roland@gnu.ai.mit.edu
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before changing it!
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Copyright (C) 1987, 88, 89, 90, 91, 92, 1993
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Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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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, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifndef __STDC__
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# ifndef const
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# define const
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# endif
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#endif
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/* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>. */
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#ifndef _NO_PROTO
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#define _NO_PROTO
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#endif
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#include <stdio.h>
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#include <string.h>
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/* Comment out all this code if we are using the GNU C Library, and are not
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actually compiling the library itself. This code is part of the GNU C
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Library, but also included in many other GNU distributions. Compiling
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and linking in this code is a waste when using the GNU C library
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(especially if it is a shared library). Rather than having every GNU
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program understand `configure --with-gnu-libc' and omit the object files,
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it is simpler to just do this in the source for each such file. */
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#if defined (_LIBC) || !defined (__GNU_LIBRARY__)
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/* This needs to come after some library #include
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to get __GNU_LIBRARY__ defined. */
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#ifdef __GNU_LIBRARY__
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/* Don't include stdlib.h for non-GNU C libraries because some of them
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contain conflicting prototypes for getopt. */
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#include <stdlib.h>
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#endif /* GNU C library. */
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/* If GETOPT_COMPAT is defined, `+' as well as `--' can introduce a
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long-named option. Because this is not POSIX.2 compliant, it is
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being phased out. */
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/* #define GETOPT_COMPAT */
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/* 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 POSIXLY_CORRECT 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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#include "getopt.h"
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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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Also, when `ordering' is RETURN_IN_ORDER,
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each non-option ARGV-element is returned here. */
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char *optarg = 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 `getopt'.
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On entry to `getopt', zero means this is the first call; initialize.
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When `getopt' 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, `optind' communicates from one call to the next
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how much of ARGV has been scanned so far. */
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/* XXX 1003.2 says this must be 1 before any call. */
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int optind = 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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int opterr = 1;
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/* Set to an option character which was unrecognized.
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This must be initialized on some systems to avoid linking in the
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system's own getopt implementation. */
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#define BAD_OPTION '\0'
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int optopt = BAD_OPTION;
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/* Describe how to deal with options that follow non-option ARGV-elements.
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If the caller did not specify anything,
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the default is REQUIRE_ORDER if the environment variable
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POSIXLY_CORRECT is defined, PERMUTE otherwise.
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REQUIRE_ORDER means don't recognize them as options;
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stop option processing when the first non-option is seen.
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This is what Unix does.
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This mode of operation is selected by either setting the environment
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variable POSIXLY_CORRECT, or using `+' as the first character
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of the list of option characters.
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PERMUTE is the default. We permute the contents of ARGV as we scan,
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so that eventually all the non-options are at the end. This allows options
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to be given in any order, even with programs that were not written to
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expect this.
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RETURN_IN_ORDER is an option available to programs that were written
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to expect options and other ARGV-elements in any order and that care about
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the ordering of the two. We describe each non-option ARGV-element
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as if it were the argument of an option with character code 1.
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Using `-' as the first character of the list of option characters
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selects this mode of operation.
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The special argument `--' forces an end of option-scanning regardless
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of the value of `ordering'. In the case of RETURN_IN_ORDER, only
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`--' can cause `getopt' to return EOF with `optind' != ARGC. */
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static enum {
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REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
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} ordering;
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#ifdef __GNU_LIBRARY__
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/* We want to avoid inclusion of string.h with non-GNU libraries
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because there are many ways it can cause trouble.
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On some systems, it contains special magic macros that don't work
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in GCC. */
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#include <string.h>
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#define my_index strchr
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#define my_strlen strlen
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#else
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/* Avoid depending on library functions or files
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whose names are inconsistent. */
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#if __STDC__ || defined(PROTO)
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extern char *getenv(const char *name);
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//extern int strcmp(const char *s1, const char *s2);
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//extern int strncmp(const char *s1, const char *s2, int n);
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static int my_strlen(const char *s);
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static char *my_index(const char *str, int chr);
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#else
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extern char *getenv();
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#endif
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#ifdef _KOLIBRI
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char* getenv(const char *name) {
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return NULL;
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}
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#endif
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static int my_strlen(const char *str)
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{
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int n = 0;
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while (*str++)
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n++;
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return n;
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}
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static char *my_index(const char *str, int chr)
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{
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while (*str) {
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if (*str == chr)
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return (char *) str;
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str++;
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}
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return 0;
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}
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#endif /* GNU C library. */
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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,optind), 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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To perform the swap, we first reverse the order of all elements. So
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all options now come before all non options, but they are in the
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wrong order. So we put back the options and non options in original
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order by reversing them again. For example:
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original input: a b c -x -y
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reverse all: -y -x c b a
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reverse options: -x -y c b a
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reverse non options: -x -y a b c
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*/
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#if __STDC__ || defined(PROTO)
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static void exchange(char **argv);
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#endif
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static void exchange(char **argv)
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{
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char *temp, **first, **last;
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/* Reverse all the elements [first_nonopt, optind) */
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first = &argv[first_nonopt];
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last = &argv[optind - 1];
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while (first < last) {
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temp = *first;
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*first = *last;
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*last = temp;
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first++;
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last--;
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}
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/* Put back the options in order */
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first = &argv[first_nonopt];
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first_nonopt += (optind - last_nonopt);
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last = &argv[first_nonopt - 1];
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while (first < last) {
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temp = *first;
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*first = *last;
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*last = temp;
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first++;
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last--;
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}
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/* Put back the non options in order */
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first = &argv[first_nonopt];
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last_nonopt = optind;
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last = &argv[last_nonopt - 1];
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while (first < last) {
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temp = *first;
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*first = *last;
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*last = temp;
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first++;
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last--;
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}
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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 `getopt'
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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 `getopt' finds another option character, it returns that character,
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updating `optind' and `nextchar' so that the next call to `getopt' 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, `getopt' returns `EOF'.
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Then `optind' 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 BAD_OPTION after printing an error message. If you set `opterr' to
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zero, the error message is suppressed but we still return BAD_OPTION.
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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 `optarg'. 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 `optarg', otherwise `optarg' is set to zero.
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If OPTSTRING starts with `-' or `+', it requests different methods of
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handling the non-option ARGV-elements.
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See the comments about RETURN_IN_ORDER and REQUIRE_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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When `getopt' finds a long-named option, it returns 0 if that option's
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`flag' field is nonzero, the value of the option's `val' field
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if the `flag' field is zero.
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The elements of ARGV aren't really const, because we permute them.
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But we pretend they're const in the prototype to be compatible
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with other systems.
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LONGOPTS is a vector of `struct option' terminated by an
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element containing a name which is zero.
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LONGIND returns the index in LONGOPT of the long-named option found.
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It is only valid when a long-named option has been found by the most
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recent call.
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If LONG_ONLY is nonzero, '-' as well as '--' can introduce
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long-named options. */
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int _getopt_internal(int argc, char *const *argv, const char *optstring,
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const struct option *longopts, int *longind, int long_only)
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{
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int option_index;
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optarg = 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 (optind == 0) {
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first_nonopt = last_nonopt = optind = 1;
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nextchar = NULL;
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/* Determine how to handle the ordering of options and nonoptions. */
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if (optstring[0] == '-') {
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ordering = RETURN_IN_ORDER;
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++optstring;
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} else if (optstring[0] == '+') {
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ordering = REQUIRE_ORDER;
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++optstring;
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} else if (getenv("POSIXLY_CORRECT") != NULL)
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ordering = REQUIRE_ORDER;
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else
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ordering = PERMUTE;
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}
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if (nextchar == NULL || *nextchar == '\0') {
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if (ordering == PERMUTE) {
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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 != optind)
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exchange((char **) argv);
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else if (last_nonopt != optind)
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first_nonopt = optind;
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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 (optind < argc && (argv[optind][0] != '-' || argv[optind][1] == '\0')
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#ifdef GETOPT_COMPAT
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&& (longopts == NULL
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|| argv[optind][0] != '+' || argv[optind][1] == '\0')
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#endif /* GETOPT_COMPAT */
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)
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optind++;
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last_nonopt = optind;
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}
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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 (optind != argc && !strcmp(argv[optind], "--")) {
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optind++;
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if (first_nonopt != last_nonopt && last_nonopt != optind)
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exchange((char **) argv);
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else if (first_nonopt == last_nonopt)
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first_nonopt = optind;
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last_nonopt = argc;
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optind = 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 (optind == argc) {
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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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optind = 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 it by. */
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if ((argv[optind][0] != '-' || argv[optind][1] == '\0')
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#ifdef GETOPT_COMPAT
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&& (longopts == NULL || argv[optind][0] != '+' || argv[optind][1] == '\0')
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#endif /* GETOPT_COMPAT */
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) {
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if (ordering == REQUIRE_ORDER)
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return EOF;
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optarg = argv[optind++];
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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[optind] + 1 + (longopts != NULL && argv[optind][1] == '-'));
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}
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if (longopts != NULL && ((argv[optind][0] == '-' && (argv[optind][1] == '-' || long_only))
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#ifdef GETOPT_COMPAT
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|| argv[optind][0] == '+'
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#endif /* GETOPT_COMPAT */
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)) {
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const struct option *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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const struct option *pfound = NULL;
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int indfound = 0;
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while (*s && *s != '=')
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s++;
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/* Test all options for either exact match or abbreviated matches. */
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for (p = longopts, option_index = 0; p->name; p++, option_index++)
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if (!strncmp(p->name, nextchar, s - nextchar)) {
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if (s - nextchar == my_strlen(p->name)) {
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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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} else if (pfound == NULL) {
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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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} 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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if (opterr)
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fprintf(stderr, "%s: option `%s' is ambiguous\n",
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argv[0], argv[optind]);
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nextchar += my_strlen(nextchar);
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optind++;
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return BAD_OPTION;
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}
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if (pfound != NULL) {
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option_index = indfound;
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optind++;
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if (*s) {
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/* Don't test has_arg with >, because some C compilers don't
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allow it to be used on enums. */
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if (pfound->has_arg)
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optarg = s + 1;
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else {
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if (opterr) {
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if (argv[optind - 1][1] == '-')
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/* --option */
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fprintf(stderr,
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"%s: option `--%s' doesn't allow an argument\n",
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argv[0], pfound->name);
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else
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/* +option or -option */
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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[optind - 1][0],
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pfound->name);
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}
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nextchar += my_strlen(nextchar);
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return BAD_OPTION;
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}
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} else if (pfound->has_arg == 1) {
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if (optind < argc)
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optarg = argv[optind++];
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else {
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if (opterr)
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fprintf(stderr,
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"%s: option `%s' requires an argument\n",
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argv[0], argv[optind - 1]);
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nextchar += my_strlen(nextchar);
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return optstring[0] == ':' ? ':' : BAD_OPTION;
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}
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}
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nextchar += my_strlen(nextchar);
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||
if (longind != NULL)
|
||
*longind = option_index;
|
||
if (pfound->flag) {
|
||
*(pfound->flag) = pfound->val;
|
||
return 0;
|
||
}
|
||
return pfound->val;
|
||
}
|
||
/* Can't find it as a long option. If this is not getopt_long_only,
|
||
or the option starts with '--' or is not a valid short
|
||
option, then it's an error.
|
||
Otherwise interpret it as a short option. */
|
||
if (!long_only || argv[optind][1] == '-'
|
||
#ifdef GETOPT_COMPAT
|
||
|| argv[optind][0] == '+'
|
||
#endif /* GETOPT_COMPAT */
|
||
|| my_index(optstring, *nextchar) == NULL) {
|
||
if (opterr) {
|
||
if (argv[optind][1] == '-')
|
||
/* --option */
|
||
fprintf(stderr, "%s: unrecognized option `--%s'\n",
|
||
argv[0], nextchar);
|
||
else
|
||
/* +option or -option */
|
||
fprintf(stderr, "%s: unrecognized option `%c%s'\n",
|
||
argv[0], argv[optind][0], nextchar);
|
||
}
|
||
nextchar = (char *) "";
|
||
optind++;
|
||
return BAD_OPTION;
|
||
}
|
||
}
|
||
|
||
/* Look at and handle the next option-character. */
|
||
|
||
{
|
||
char c = *nextchar++;
|
||
char *temp = my_index(optstring, c);
|
||
|
||
/* Increment `optind' when we start to process its last character. */
|
||
if (*nextchar == '\0')
|
||
++optind;
|
||
|
||
if (temp == NULL || c == ':') {
|
||
if (opterr) {
|
||
#if 0
|
||
if (c < 040 || c >= 0177)
|
||
fprintf(stderr,
|
||
"%s: unrecognized option, character code 0%o\n",
|
||
argv[0], c);
|
||
else
|
||
fprintf(stderr, "%s: unrecognized option `-%c'\n", argv[0],
|
||
c);
|
||
#else
|
||
/* 1003.2 specifies the format of this message. */
|
||
fprintf(stderr, "%s: illegal option -- %c\n", argv[0], c);
|
||
#endif
|
||
}
|
||
optopt = c;
|
||
return BAD_OPTION;
|
||
}
|
||
if (temp[1] == ':') {
|
||
if (temp[2] == ':') {
|
||
/* This is an option that accepts an argument optionally. */
|
||
if (*nextchar != '\0') {
|
||
optarg = nextchar;
|
||
optind++;
|
||
} else
|
||
optarg = 0;
|
||
nextchar = NULL;
|
||
} else {
|
||
/* This is an option that requires an argument. */
|
||
if (*nextchar != '\0') {
|
||
optarg = nextchar;
|
||
/* If we end this ARGV-element by taking the rest as an arg,
|
||
we must advance to the next element now. */
|
||
optind++;
|
||
} else if (optind == argc) {
|
||
if (opterr) {
|
||
#if 0
|
||
fprintf(stderr,
|
||
"%s: option `-%c' requires an argument\n",
|
||
argv[0], c);
|
||
#else
|
||
/* 1003.2 specifies the format of this message. */
|
||
fprintf(stderr,
|
||
"%s: option requires an argument -- %c\n",
|
||
argv[0], c);
|
||
#endif
|
||
}
|
||
optopt = c;
|
||
if (optstring[0] == ':')
|
||
c = ':';
|
||
else
|
||
c = BAD_OPTION;
|
||
} else
|
||
/* We already incremented `optind' once;
|
||
increment it again when taking next ARGV-elt as argument. */
|
||
optarg = argv[optind++];
|
||
nextchar = NULL;
|
||
}
|
||
}
|
||
return c;
|
||
}
|
||
}
|
||
|
||
int getopt(int argc, char *const *argv, const char *optstring)
|
||
{
|
||
return _getopt_internal(argc, argv, optstring, (const struct option *) 0, (int *) 0, 0);
|
||
}
|
||
|
||
int getopt_long(int argc, char *const *argv, const char *options, const struct option *long_options, int *opt_index)
|
||
{
|
||
return _getopt_internal(argc, argv, options, long_options, opt_index, 0);
|
||
}
|
||
|
||
#endif /* _LIBC or not __GNU_LIBRARY__. */
|
||
|
||
#ifdef TEST
|
||
|
||
/* Compile with -DTEST to make an executable for use in testing
|
||
the above definition of `getopt'. */
|
||
|
||
int main(int argc, char **argv)
|
||
{
|
||
int c;
|
||
int digit_optind = 0;
|
||
|
||
while (1) {
|
||
int this_option_optind = optind ? optind : 1;
|
||
|
||
c = getopt(argc, argv, "abc:d:0123456789");
|
||
if (c == EOF)
|
||
break;
|
||
|
||
switch (c) {
|
||
case '0':
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
case '5':
|
||
case '6':
|
||
case '7':
|
||
case '8':
|
||
case '9':
|
||
if (digit_optind != 0 && digit_optind != this_option_optind)
|
||
printf("digits occur in two different argv-elements.\n");
|
||
digit_optind = this_option_optind;
|
||
printf("option %c\n", c);
|
||
break;
|
||
|
||
case 'a':
|
||
printf("option a\n");
|
||
break;
|
||
|
||
case 'b':
|
||
printf("option b\n");
|
||
break;
|
||
|
||
case 'c':
|
||
printf("option c with value `%s'\n", optarg);
|
||
break;
|
||
|
||
case BAD_OPTION:
|
||
break;
|
||
|
||
default:
|
||
printf("?? getopt returned character code 0%o ??\n", c);
|
||
}
|
||
}
|
||
|
||
if (optind < argc) {
|
||
printf("non-option ARGV-elements: ");
|
||
while (optind < argc)
|
||
printf("%s ", argv[optind++]);
|
||
printf("\n");
|
||
}
|
||
|
||
exit(0);
|
||
}
|
||
|
||
#endif /* TEST */
|