author | Edouard Tisserant |
Wed, 13 Apr 2011 16:29:59 +0200 | |
changeset 659 | 1041153c5fd2 |
parent 246 | d635cfc520ee |
permissions | -rw-r--r-- |
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/* from http://www.pwilson.net/getopt.html */ |
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/* getopt.h */ |
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/* Declarations for getopt. |
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Copyright (C) 1989-1994, 1996-1999, 2001 Free Software |
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Foundation, Inc. This file is part of the GNU C Library. |
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The GNU C Library is free software; you can redistribute |
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it and/or modify it under the terms of the GNU Lesser |
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General Public License as published by the Free Software |
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Foundation; either version 2.1 of the License, or |
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(at your option) any later version. |
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The GNU C Library is distributed in the hope that it will |
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be useful, but WITHOUT ANY WARRANTY; without even the |
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implied warranty of MERCHANTABILITY or FITNESS FOR A |
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PARTICULAR PURPOSE. See the GNU Lesser General Public |
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License for more details. |
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You should have received a copy of the GNU Lesser General |
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Public License along with the GNU C Library; if not, write |
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to the Free Software Foundation, Inc., 59 Temple Place, |
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Suite 330, Boston, MA 02111-1307 USA. */ |
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#ifndef _GETOPT_H |
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#ifndef __need_getopt |
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# define _GETOPT_H 1 |
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#endif |
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/* If __GNU_LIBRARY__ is not already defined, either we are being used |
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standalone, or this is the first header included in the source file. |
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If we are being used with glibc, we need to include <features.h>, but |
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that does not exist if we are standalone. So: if __GNU_LIBRARY__ is |
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not defined, include <ctype.h>, which will pull in <features.h> for us |
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if it's from glibc. (Why ctype.h? It's guaranteed to exist and it |
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doesn't flood the namespace with stuff the way some other headers do.) */ |
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#if !defined __GNU_LIBRARY__ |
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# include <ctype.h> |
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#endif |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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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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extern char *optarg; |
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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 -1, 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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extern int optind; |
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/* Callers store zero here to inhibit the error message `getopt' prints |
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for unrecognized options. */ |
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extern int opterr; |
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/* Set to an option character which was unrecognized. */ |
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extern int optopt; |
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#ifndef __need_getopt |
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/* Describe the long-named options requested by the application. |
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The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector |
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of `struct option' terminated by an element containing a name which is |
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zero. |
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The field `has_arg' is: |
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no_argument (or 0) if the option does not take an argument, |
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required_argument (or 1) if the option requires an argument, |
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optional_argument (or 2) if the option takes an optional argument. |
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If the field `flag' is not NULL, it points to a variable that is set |
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to the value given in the field `val' when the option is found, but |
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left unchanged if the option is not found. |
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To have a long-named option do something other than set an `int' to |
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a compiled-in constant, such as set a value from `optarg', set the |
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option's `flag' field to zero and its `val' field to a nonzero |
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value (the equivalent single-letter option character, if there is |
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one). For long options that have a zero `flag' field, `getopt' |
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returns the contents of the `val' field. */ |
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struct option |
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{ |
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# if (defined __STDC__ && __STDC__) || defined __cplusplus |
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const char *name; |
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# else |
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char *name; |
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# endif |
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/* has_arg can't be an enum because some compilers complain about |
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type mismatches in all the code that assumes it is an int. */ |
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int has_arg; |
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int *flag; |
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int val; |
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}; |
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/* Names for the values of the `has_arg' field of `struct option'. */ |
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# define no_argument 0 |
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# define required_argument 1 |
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# define optional_argument 2 |
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#endif /* need getopt */ |
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/* Get definitions and prototypes for functions to process the |
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arguments in ARGV (ARGC of them, minus the program name) for |
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options given in OPTS. |
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|
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Return the option character from OPTS just read. Return -1 when |
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there are no more options. For unrecognized options, or options |
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missing arguments, `optopt' is set to the option letter, and '?' is |
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returned. |
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133 |
|
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The OPTS string is a list of characters which are recognized option |
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letters, optionally followed by colons, specifying that that letter |
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takes an argument, to be placed in `optarg'. |
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137 |
|
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If a letter in OPTS is followed by two colons, its argument is |
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optional. This behavior is specific to the GNU `getopt'. |
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140 |
|
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The argument `--' causes premature termination of argument |
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scanning, explicitly telling `getopt' that there are no more |
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options. |
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144 |
|
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If OPTS begins with `--', then non-option arguments are treated as |
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arguments to the option '\0'. This behavior is specific to the GNU |
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`getopt'. */ |
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148 |
|
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#if (defined __STDC__ && __STDC__) || defined __cplusplus |
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# ifdef __GNU_LIBRARY__ |
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/* Many other libraries have conflicting prototypes for getopt, with |
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differences in the consts, in stdlib.h. To avoid compilation |
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errors, only prototype getopt for the GNU C library. */ |
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extern int getopt (int ___argc, char *const *___argv, const char *__shortopts); |
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# else /* not __GNU_LIBRARY__ */ |
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extern int getopt (); |
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# endif /* __GNU_LIBRARY__ */ |
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158 |
|
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# ifndef __need_getopt |
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extern int getopt_long (int ___argc, char *const *___argv, |
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const char *__shortopts, |
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const struct option *__longopts, int *__longind); |
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extern int getopt_long_only (int ___argc, char *const *___argv, |
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const char *__shortopts, |
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const struct option *__longopts, int *__longind); |
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166 |
|
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/* Internal only. Users should not call this directly. */ |
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extern int _getopt_internal (int ___argc, char *const *___argv, |
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169 |
const char *__shortopts, |
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const struct option *__longopts, int *__longind, |
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int __long_only); |
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# endif |
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#else /* not __STDC__ */ |
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extern int getopt (); |
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175 |
# ifndef __need_getopt |
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extern int getopt_long (); |
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extern int getopt_long_only (); |
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178 |
|
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extern int _getopt_internal (); |
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# endif |
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181 |
#endif /* __STDC__ */ |
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182 |
|
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183 |
#ifdef __cplusplus |
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184 |
} |
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185 |
#endif |
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186 |
|
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187 |
/* Make sure we later can get all the definitions and declarations. */ |
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188 |
#undef __need_getopt |
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189 |
|
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#endif /* getopt.h */ |
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191 |