1 /* Declarations for getopt.
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2 Copyright (C) 1989,90,91,92,93,94,96,97,98 Free Software Foundation, Inc.
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3 This file is part of the GNU C Library.
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5 The GNU C Library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public License as
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7 published by the Free Software Foundation; either version 2 of the
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8 License, or (at your option) any later version.
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10 The GNU C Library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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15 You should have received a copy of the GNU Library General Public
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16 License along with the GNU C Library; see the file COPYING.LIB. If not,
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17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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18 Boston, MA 02111-1307, USA. */
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22 #ifndef __need_getopt
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23 # define _GETOPT_H 1
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30 /* For communication from `getopt' to the caller.
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31 When `getopt' finds an option that takes an argument,
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32 the argument value is returned here.
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33 Also, when `ordering' is RETURN_IN_ORDER,
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34 each non-option ARGV-element is returned here. */
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36 extern char *optarg;
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38 /* Index in ARGV of the next element to be scanned.
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39 This is used for communication to and from the caller
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40 and for communication between successive calls to `getopt'.
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42 On entry to `getopt', zero means this is the first call; initialize.
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44 When `getopt' returns -1, this is the index of the first of the
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45 non-option elements that the caller should itself scan.
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47 Otherwise, `optind' communicates from one call to the next
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48 how much of ARGV has been scanned so far. */
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52 /* Callers store zero here to inhibit the error message `getopt' prints
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53 for unrecognized options. */
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57 /* Set to an option character which was unrecognized. */
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61 #ifndef __need_getopt
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62 /* Describe the long-named options requested by the application.
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63 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
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64 of `struct option' terminated by an element containing a name which is
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67 The field `has_arg' is:
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68 no_argument (or 0) if the option does not take an argument,
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69 required_argument (or 1) if the option requires an argument,
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70 optional_argument (or 2) if the option takes an optional argument.
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72 If the field `flag' is not NULL, it points to a variable that is set
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73 to the value given in the field `val' when the option is found, but
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74 left unchanged if the option is not found.
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76 To have a long-named option do something other than set an `int' to
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77 a compiled-in constant, such as set a value from `optarg', set the
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78 option's `flag' field to zero and its `val' field to a nonzero
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79 value (the equivalent single-letter option character, if there is
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80 one). For long options that have a zero `flag' field, `getopt'
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81 returns the contents of the `val' field. */
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85 # if defined __STDC__ && __STDC__
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90 /* has_arg can't be an enum because some compilers complain about
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91 type mismatches in all the code that assumes it is an int. */
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97 /* Names for the values of the `has_arg' field of `struct option'. */
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99 # define no_argument 0
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100 # define required_argument 1
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101 # define optional_argument 2
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102 #endif /* need getopt */
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105 /* Get definitions and prototypes for functions to process the
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106 arguments in ARGV (ARGC of them, minus the program name) for
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107 options given in OPTS.
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109 Return the option character from OPTS just read. Return -1 when
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110 there are no more options. For unrecognized options, or options
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111 missing arguments, `optopt' is set to the option letter, and '?' is
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114 The OPTS string is a list of characters which are recognized option
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115 letters, optionally followed by colons, specifying that that letter
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116 takes an argument, to be placed in `optarg'.
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118 If a letter in OPTS is followed by two colons, its argument is
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119 optional. This behavior is specific to the GNU `getopt'.
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121 The argument `--' causes premature termination of argument
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122 scanning, explicitly telling `getopt' that there are no more
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125 If OPTS begins with `--', then non-option arguments are treated as
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126 arguments to the option '\0'. This behavior is specific to the GNU
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129 #if defined __STDC__ && __STDC__
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130 # ifdef __GNU_LIBRARY__
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131 /* Many other libraries have conflicting prototypes for getopt, with
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132 differences in the consts, in stdlib.h. To avoid compilation
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133 errors, only prototype getopt for the GNU C library. */
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134 extern int getopt (int __argc, char *const *__argv, const char *__shortopts);
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135 # else /* not __GNU_LIBRARY__ */
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136 extern int getopt ();
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137 # endif /* __GNU_LIBRARY__ */
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139 # ifndef __need_getopt
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140 extern int getopt_long (int __argc, char *const *__argv, const char *__shortopts,
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141 const struct option *__longopts, int *__longind);
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142 extern int getopt_long_only (int __argc, char *const *__argv,
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143 const char *__shortopts,
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144 const struct option *__longopts, int *__longind);
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146 /* Internal only. Users should not call this directly. */
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147 extern int _getopt_internal (int __argc, char *const *__argv,
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148 const char *__shortopts,
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149 const struct option *__longopts, int *__longind,
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152 #else /* not __STDC__ */
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153 extern int getopt ();
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154 # ifndef __need_getopt
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155 extern int getopt_long ();
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156 extern int getopt_long_only ();
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158 extern int _getopt_internal ();
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160 #endif /* __STDC__ */
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166 /* Make sure we later can get all the definitions and declarations. */
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167 #undef __need_getopt
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169 #endif /* getopt.h */
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