Keep the command line on the heap to avoid stack overflow.
[make.git] / getopt.h
blob1a6eaf594ce64ffe0ad1a2cff23e0e1493921752
1 /* Declarations for getopt.
2 Copyright (C) 1989-2012 Free Software Foundation, Inc.
4 NOTE: The canonical source of this file is maintained with the GNU C Library.
5 Bugs can be reported to bug-glibc@gnu.org.
7 GNU Make is free software; you can redistribute it and/or modify it under the
8 terms of the GNU General Public License as published by the Free Software
9 Foundation; either version 3 of the License, or (at your option) any later
10 version.
12 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
14 A PARTICULAR PURPOSE. See the GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License along with
17 this program. If not, see <http://www.gnu.org/licenses/>. */
19 #ifndef _GETOPT_H
20 #define _GETOPT_H 1
22 #ifdef __cplusplus
23 extern "C" {
24 #endif
26 /* For communication from `getopt' to the caller.
27 When `getopt' finds an option that takes an argument,
28 the argument value is returned here.
29 Also, when `ordering' is RETURN_IN_ORDER,
30 each non-option ARGV-element is returned here. */
32 extern char *optarg;
34 /* Index in ARGV of the next element to be scanned.
35 This is used for communication to and from the caller
36 and for communication between successive calls to `getopt'.
38 On entry to `getopt', zero means this is the first call; initialize.
40 When `getopt' returns -1, this is the index of the first of the
41 non-option elements that the caller should itself scan.
43 Otherwise, `optind' communicates from one call to the next
44 how much of ARGV has been scanned so far. */
46 extern int optind;
48 /* Callers store zero here to inhibit the error message `getopt' prints
49 for unrecognized options. */
51 extern int opterr;
53 /* Set to an option character which was unrecognized. */
55 extern int optopt;
57 /* Describe the long-named options requested by the application.
58 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
59 of `struct option' terminated by an element containing a name which is
60 zero.
62 The field `has_arg' is:
63 no_argument (or 0) if the option does not take an argument,
64 required_argument (or 1) if the option requires an argument,
65 optional_argument (or 2) if the option takes an optional argument.
67 If the field `flag' is not NULL, it points to a variable that is set
68 to the value given in the field `val' when the option is found, but
69 left unchanged if the option is not found.
71 To have a long-named option do something other than set an `int' to
72 a compiled-in constant, such as set a value from `optarg', set the
73 option's `flag' field to zero and its `val' field to a nonzero
74 value (the equivalent single-letter option character, if there is
75 one). For long options that have a zero `flag' field, `getopt'
76 returns the contents of the `val' field. */
78 struct option
80 #if defined (__STDC__) && __STDC__
81 const char *name;
82 #else
83 char *name;
84 #endif
85 /* has_arg can't be an enum because some compilers complain about
86 type mismatches in all the code that assumes it is an int. */
87 int has_arg;
88 int *flag;
89 int val;
92 /* Names for the values of the `has_arg' field of `struct option'. */
94 #define no_argument 0
95 #define required_argument 1
96 #define optional_argument 2
98 #if defined (__STDC__) && __STDC__
99 #ifdef __GNU_LIBRARY__
100 /* Many other libraries have conflicting prototypes for getopt, with
101 differences in the consts, in stdlib.h. To avoid compilation
102 errors, only prototype getopt for the GNU C library. */
103 extern int getopt (int argc, char *const *argv, const char *shortopts);
104 #else /* not __GNU_LIBRARY__ */
105 extern int getopt ();
106 #endif /* __GNU_LIBRARY__ */
107 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
108 const struct option *longopts, int *longind);
109 extern int getopt_long_only (int argc, char *const *argv,
110 const char *shortopts,
111 const struct option *longopts, int *longind);
113 /* Internal only. Users should not call this directly. */
114 extern int _getopt_internal (int argc, char *const *argv,
115 const char *shortopts,
116 const struct option *longopts, int *longind,
117 int long_only);
118 #else /* not __STDC__ */
119 extern int getopt ();
120 extern int getopt_long ();
121 extern int getopt_long_only ();
123 extern int _getopt_internal ();
124 #endif /* __STDC__ */
126 #ifdef __cplusplus
128 #endif
130 #endif /* getopt.h */