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1 /* Declarations for getopt. |
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2 Copyright (C) 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc. |
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3 |
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4 This program is free software; you can redistribute it and/or modify it |
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5 under the terms of the GNU General Public License as published by the |
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6 Free Software Foundation; either version 2, or (at your option) any |
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7 later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public License |
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15 along with this program; if not, write to the Free Software |
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16 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
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17 |
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18 #ifndef _GETOPT_H |
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19 #define _GETOPT_H 1 |
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20 |
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21 #ifdef __cplusplus |
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22 extern "C" { |
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23 #endif |
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24 |
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25 /* For communication from `getopt' to the caller. |
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26 When `getopt' finds an option that takes an argument, |
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27 the argument value is returned here. |
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28 Also, when `ordering' is RETURN_IN_ORDER, |
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29 each non-option ARGV-element is returned here. */ |
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30 |
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31 extern char *optarg; |
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32 |
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33 /* Index in ARGV of the next element to be scanned. |
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34 This is used for communication to and from the caller |
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35 and for communication between successive calls to `getopt'. |
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36 |
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37 On entry to `getopt', zero means this is the first call; initialize. |
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38 |
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39 When `getopt' returns EOF, this is the index of the first of the |
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40 non-option elements that the caller should itself scan. |
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41 |
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42 Otherwise, `optind' communicates from one call to the next |
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43 how much of ARGV has been scanned so far. */ |
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44 |
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45 extern int optind; |
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46 |
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47 /* Callers store zero here to inhibit the error message `getopt' prints |
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48 for unrecognized options. */ |
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49 |
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50 extern int opterr; |
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51 |
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52 /* Set to an option character which was unrecognized. */ |
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53 |
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54 extern int optopt; |
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55 |
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56 /* Describe the long-named options requested by the application. |
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57 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector |
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58 of `struct option' terminated by an element containing a name which is |
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59 zero. |
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60 |
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61 The field `has_arg' is: |
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62 no_argument (or 0) if the option does not take an argument, |
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63 required_argument (or 1) if the option requires an argument, |
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64 optional_argument (or 2) if the option takes an optional argument. |
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65 |
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66 If the field `flag' is not NULL, it points to a variable that is set |
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67 to the value given in the field `val' when the option is found, but |
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68 left unchanged if the option is not found. |
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69 |
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70 To have a long-named option do something other than set an `int' to |
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71 a compiled-in constant, such as set a value from `optarg', set the |
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72 option's `flag' field to zero and its `val' field to a nonzero |
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73 value (the equivalent single-letter option character, if there is |
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74 one). For long options that have a zero `flag' field, `getopt' |
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75 returns the contents of the `val' field. */ |
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76 |
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77 struct option |
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78 { |
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79 #if __STDC__ |
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80 const char *name; |
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81 #else |
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82 char *name; |
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83 #endif |
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84 /* has_arg can't be an enum because some compilers complain about |
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85 type mismatches in all the code that assumes it is an int. */ |
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86 int has_arg; |
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87 int *flag; |
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88 int val; |
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89 }; |
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90 |
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91 /* Names for the values of the `has_arg' field of `struct option'. */ |
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92 |
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93 #define no_argument 0 |
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94 #define required_argument 1 |
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95 #define optional_argument 2 |
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96 |
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97 #if __STDC__ |
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98 #if defined(__GNU_LIBRARY__) |
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99 /* Many other libraries have conflicting prototypes for getopt, with |
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100 differences in the consts, in stdlib.h. To avoid compilation |
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101 errors, only prototype getopt for the GNU C library. */ |
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102 extern int getopt (int argc, char *const *argv, const char *shortopts); |
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103 #else /* not __GNU_LIBRARY__ */ |
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104 extern int getopt (); |
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105 #endif /* not __GNU_LIBRARY__ */ |
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106 extern int getopt_long (int argc, char *const *argv, const char *shortopts, |
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107 const struct option *longopts, int *longind); |
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108 extern int getopt_long_only (int argc, char *const *argv, |
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109 const char *shortopts, |
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110 const struct option *longopts, int *longind); |
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111 |
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112 /* Internal only. Users should not call this directly. */ |
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113 extern int _getopt_internal (int argc, char *const *argv, |
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114 const char *shortopts, |
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115 const struct option *longopts, int *longind, |
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116 int long_only); |
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117 #else /* not __STDC__ */ |
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118 extern int getopt (); |
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119 extern int getopt_long (); |
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120 extern int getopt_long_only (); |
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121 |
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122 extern int _getopt_internal (); |
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123 #endif /* not __STDC__ */ |
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124 |
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125 #ifdef __cplusplus |
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126 } |
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127 #endif |
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128 |
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129 #endif /* _GETOPT_H */ |
