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Diffstat (limited to 'nsprpub/lib/libc/include/plgetopt.h')
| -rw-r--r-- | nsprpub/lib/libc/include/plgetopt.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/nsprpub/lib/libc/include/plgetopt.h b/nsprpub/lib/libc/include/plgetopt.h new file mode 100644 index 0000000000..19cafa6009 --- /dev/null +++ b/nsprpub/lib/libc/include/plgetopt.h @@ -0,0 +1,125 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* +** File: plgetopt.h +** Description: utilities to parse argc/argv +*/ + +#if defined(PLGETOPT_H_) +#else +#define PLGETOPT_H_ + +#include "prtypes.h" + +PR_BEGIN_EXTERN_C + +typedef struct PLOptionInternal PLOptionInternal; + +typedef enum +{ + PL_OPT_OK, /* all's well with the option */ + PL_OPT_EOL, /* end of options list */ + PL_OPT_BAD /* invalid option (and value) */ +} PLOptStatus; + +typedef struct PLLongOpt +{ + const char * longOptName; /* long option name string */ + PRIntn longOption; /* value put in PLOptState for this option. */ + PRBool valueRequired; /* If option name not followed by '=', */ + /* value is the next argument from argv. */ +} PLLongOpt; + +typedef struct PLOptState +{ + char option; /* the name of the option */ + const char *value; /* the value of that option | NULL */ + + PLOptionInternal *internal; /* private processing state */ + + PRIntn longOption; /* value from PLLongOpt put here */ + PRIntn longOptIndex; /* index into caller's array of PLLongOpts */ +} PLOptState; + +/* + * PL_CreateOptState + * + * The argument "options" points to a string of single-character option + * names. Option names that may have an option argument value must be + * followed immediately by a ':' character. + */ +PR_EXTERN(PLOptState*) PL_CreateOptState( + PRIntn argc, char **argv, const char *options); + +/* + * PL_CreateLongOptState + * + * Alternative to PL_CreateOptState. + * Allows caller to specify BOTH a string of single-character option names, + * AND an array of structures describing "long" (keyword) option names. + * The array is terminated by a structure in which longOptName is NULL. + * Long option values (arguments) may always be given as "--name=value". + * If PLLongOpt.valueRequired is not PR_FALSE, and the option name was not + * followed by '=' then the next argument from argv is taken as the value. + */ +PR_EXTERN(PLOptState*) PL_CreateLongOptState( + PRIntn argc, char **argv, const char *options, + const PLLongOpt *longOpts); +/* + * PL_DestroyOptState + * + * Call this to destroy the PLOptState returned from PL_CreateOptState or + * PL_CreateLongOptState. + */ +PR_EXTERN(void) PL_DestroyOptState(PLOptState *opt); + +/* + * PL_GetNextOpt + * + * When this function returns PL_OPT_OK, + * - opt->option will hold the single-character option name that was parsed, + * or zero. + * When opt->option is zero, the token parsed was either a "long" (keyword) + * option or a positional parameter. + * For a positional parameter, + * - opt->longOptIndex will contain -1, and + * - opt->value will point to the positional parameter string. + * For a long option name, + * - opt->longOptIndex will contain the non-negative index of the + * PLLongOpt structure in the caller's array of PLLongOpt structures + * corresponding to the long option name, and + * For a single-character or long option, + * - opt->longOption will contain the value of the single-character option + * name, or the value of the longOption from the PLLongOpt structure + * for that long option. See notes below. + * - opt->value will point to the argument option string, or will + * be NULL if option does not require argument. If option requires + * argument but it is not provided, PL_OPT_BAD is returned. + * When opt->option is non-zero, + * - opt->longOptIndex will be -1 + * When this function returns PL_OPT_EOL, or PL_OPT_BAD, the contents of + * opt are undefined. + * + * Notes: It is possible to ignore opt->option, and always look at + * opt->longOption instead. opt->longOption will contain the same value + * as opt->option for single-character option names, and will contain the + * value of longOption from the PLLongOpt structure for long option names. + * This means that it is possible to equivalence long option names to + * single character names by giving the longOption in the PLLongOpt struct + * the same value as the single-character option name. + * For long options that are NOT intended to be equivalent to any single- + * character option, the longOption value should be chosen to not match + * any possible single character name. It might be advisable to choose + * longOption values greater than 0xff for such long options. + */ +PR_EXTERN(PLOptStatus) PL_GetNextOpt(PLOptState *opt); + +PR_END_EXTERN_C + +#endif /* defined(PLGETOPT_H_) */ + +/* plgetopt.h */ + |