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annotate nspr/lib/libc/include/plgetopt.h @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 /*
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7 ** File: plgetopt.h
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8 ** Description: utilities to parse argc/argv
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9 */
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10
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11 #if defined(PLGETOPT_H_)
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12 #else
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13 #define PLGETOPT_H_
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14
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15 #include "prtypes.h"
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16
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17 PR_BEGIN_EXTERN_C
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18
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19 typedef struct PLOptionInternal PLOptionInternal;
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20
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21 typedef enum
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22 {
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23 PL_OPT_OK, /* all's well with the option */
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24 PL_OPT_EOL, /* end of options list */
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25 PL_OPT_BAD /* invalid option (and value) */
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26 } PLOptStatus;
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27
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28 typedef struct PLLongOpt
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29 {
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30 const char * longOptName; /* long option name string */
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31 PRIntn longOption; /* value put in PLOptState for this option. */
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32 PRBool valueRequired; /* If option name not followed by '=', */
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33 /* value is the next argument from argv. */
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34 } PLLongOpt;
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35
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36 typedef struct PLOptState
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37 {
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38 char option; /* the name of the option */
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39 const char *value; /* the value of that option | NULL */
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40
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41 PLOptionInternal *internal; /* private processing state */
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42
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43 PRIntn longOption; /* value from PLLongOpt put here */
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44 PRIntn longOptIndex; /* index into caller's array of PLLongOpts */
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45 } PLOptState;
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46
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47 /*
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48 * PL_CreateOptState
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49 *
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50 * The argument "options" points to a string of single-character option
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51 * names. Option names that may have an option argument value must be
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52 * followed immediately by a ':' character.
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53 */
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54 PR_EXTERN(PLOptState*) PL_CreateOptState(
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55 PRIntn argc, char **argv, const char *options);
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56
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57 /*
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58 * PL_CreateLongOptState
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59 *
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60 * Alternative to PL_CreateOptState.
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61 * Allows caller to specify BOTH a string of single-character option names,
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62 * AND an array of structures describing "long" (keyword) option names.
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63 * The array is terminated by a structure in which longOptName is NULL.
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64 * Long option values (arguments) may always be given as "--name=value".
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65 * If PLLongOpt.valueRequired is not PR_FALSE, and the option name was not
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66 * followed by '=' then the next argument from argv is taken as the value.
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67 */
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68 PR_EXTERN(PLOptState*) PL_CreateLongOptState(
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69 PRIntn argc, char **argv, const char *options,
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70 const PLLongOpt *longOpts);
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71 /*
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72 * PL_DestroyOptState
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73 *
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74 * Call this to destroy the PLOptState returned from PL_CreateOptState or
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75 * PL_CreateLongOptState.
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76 */
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77 PR_EXTERN(void) PL_DestroyOptState(PLOptState *opt);
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78
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79 /*
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80 * PL_GetNextOpt
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81 *
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82 * When this function returns PL_OPT_OK,
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83 * - opt->option will hold the single-character option name that was parsed,
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84 * or zero.
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85 * When opt->option is zero, the token parsed was either a "long" (keyword)
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86 * option or a positional parameter.
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87 * For a positional parameter,
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88 * - opt->longOptIndex will contain -1, and
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89 * - opt->value will point to the positional parameter string.
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90 * For a long option name,
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91 * - opt->longOptIndex will contain the non-negative index of the
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92 * PLLongOpt structure in the caller's array of PLLongOpt structures
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93 * corresponding to the long option name, and
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94 * For a single-character or long option,
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95 * - opt->longOption will contain the value of the single-character option
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96 * name, or the value of the longOption from the PLLongOpt structure
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97 * for that long option. See notes below.
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98 * - opt->value will point to the argument option string, or will
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99 * be NULL if option does not require argument. If option requires
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100 * argument but it is not provided, PL_OPT_BAD is returned.
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101 * When opt->option is non-zero,
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102 * - opt->longOptIndex will be -1
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103 * When this function returns PL_OPT_EOL, or PL_OPT_BAD, the contents of
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104 * opt are undefined.
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105 *
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106 * Notes: It is possible to ignore opt->option, and always look at
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107 * opt->longOption instead. opt->longOption will contain the same value
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108 * as opt->option for single-character option names, and will contain the
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109 * value of longOption from the PLLongOpt structure for long option names.
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110 * This means that it is possible to equivalence long option names to
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111 * single character names by giving the longOption in the PLLongOpt struct
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112 * the same value as the single-character option name.
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113 * For long options that are NOT intended to be equivalent to any single-
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114 * character option, the longOption value should be chosen to not match
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115 * any possible single character name. It might be advisable to choose
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116 * longOption values greater than 0xff for such long options.
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117 */
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118 PR_EXTERN(PLOptStatus) PL_GetNextOpt(PLOptState *opt);
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119
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120 PR_END_EXTERN_C
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121
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122 #endif /* defined(PLGETOPT_H_) */
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123
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124 /* plgetopt.h */
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125
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