X-Git-Url: http://mj.ucw.cz/gitweb/?a=blobdiff_plain;f=ucw%2Fopt.h;h=557cadb16491255fcd62bf31ad120a87e9f001c9;hb=156301aa8c7fd24d49ed27cfbd1afc10ccb7bc58;hp=0eed318e042f3e02f7fbe97183bbe9097364457b;hpb=673ecd3007b6e3a87fdf2004c5f66e5379fbf980;p=libucw.git diff --git a/ucw/opt.h b/ucw/opt.h index 0eed318e..557cadb1 100644 --- a/ucw/opt.h +++ b/ucw/opt.h @@ -2,6 +2,8 @@ * UCW Library -- Parsing of command line options * * (c) 2013 Jan Moskyto Matejka + * (c) 2014 Martin Mares + * (c) 2014 Pavel Charvat * * This software may be freely distributed and used according to the terms * of the GNU Lesser General Public License. @@ -16,151 +18,372 @@ #include #include +#ifdef CONFIG_UCW_CLEAN_ABI +#define cf_def_file ucw_cf_def_file +#define cf_env_file ucw_cf_env_file +#define opt_conf_hook_internal ucw_opt_conf_hook_internal +#define opt_failure ucw_opt_failure +#define opt_handle_config ucw_opt_handle_config +#define opt_handle_dumpconfig ucw_opt_handle_dumpconfig +#define opt_handle_help ucw_opt_handle_help +#define opt_handle_set ucw_opt_handle_set +#define opt_help ucw_opt_help +#define opt_parse ucw_opt_parse +#endif + #define OPT_EXIT_BAD_ARGS 2 /*** - * [[opt]] + * [[classes]] + * Option classes + * -------------- + * + * Each option belongs to one of the following classes, which define + * the overall behavior of the option. In most cases, the classes + * are set automatically by <>. + * + * - `OPT_CL_END`: this is not a real option class, but a signal + * that the list of options ends. + * - `OPT_CL_BOOL`: a boolean option. If specified without an argument, + * it sets the corresponding variable to 1 (true). So does an argument of + * `1`, `y`, `yes`, or `true`. Conversely, an argument of `0`, `n`, `no`, + * or `false` sets the variable to 0 (false) and the same happens if + * the option is given as `--no-`'option' with no argument. + * - `OPT_CL_STATIC`: options of this class just take a value and store + * it in the variable. + * - `OPT_CL_MULTIPLE`: collect values from all occurrences of this + * option in a growing array (see `gary.h`). + * - `OPT_CL_SWITCH`: a multiple-choice switch, which sets the variable + * to a fixed value provided in option definition. + * - `OPT_CL_INC`: increments the variable (or decrements, if the + * `OPT_NEGATIVE` flag is set). + * - `OPT_CL_CALL`: instead of setting a variable, call a function + * and pass the value of the option to it. + * - `OPT_CL_SECTION`: not a real option, but an instruction to insert + * contents of another list of options. + * - `OPT_CL_HELP`: no option, just print a help text. + * - `OPT_CL_HOOK`: no option, but a definition of a <>. ***/ enum opt_class { - OPT_CL_END, // end of list - OPT_CL_BOOL, // boolean value - OPT_CL_STATIC, // static value - OPT_CL_SWITCH, // lookup/switch - OPT_CL_INC, // incremental value - OPT_CL_CALL, // call a function - OPT_CL_USER, // user defined value - OPT_CL_SECTION, // subsection - OPT_CL_HELP, // help line + OPT_CL_END, + OPT_CL_BOOL, + OPT_CL_STATIC, + OPT_CL_MULTIPLE, + OPT_CL_SWITCH, + OPT_CL_INC, + OPT_CL_CALL, + OPT_CL_SECTION, + OPT_CL_HELP, + OPT_CL_HOOK, }; -struct opt_section; +/*** + * [[opt_item]] + * Option definitions + * ------------------ + * + * The list of options is represented by `struct opt_section`, which points to + * a sequence of `struct opt_item`s. + * + * These structures are seldom used directly -- instead, they are produced + * by <>. + ***/ + +/** A section of option list. **/ +struct opt_section { + struct opt_item * opt; +}; + +/** A definition of a single option item. **/ struct opt_item { - const char * name; // long-op - void * ptr; // where to save - const char * help; // description in --help + const char * name; // long name (NULL if none) + int letter; // short name (0 if none) + void * ptr; // variable to store the value to + const char * help; // description in --help (NULL to omit the option from the help) union opt_union { - struct opt_section * section; // subsection for OPT_SECTION - int value; // value for OPT_SWITCH - void (* call)(struct opt_item * opt, const char * value, void * data); // function to call for OPT_CALL - struct cf_user_type * utype; // specification of the user-defined type + struct opt_section * section; // subsection for OPT_CL_SECTION + int value; // value for OPT_CL_SWITCH + void (* call)(struct opt_item * opt, const char * value, void * data); // function to call for OPT_CL_CALL + void (* hook)(struct opt_item * opt, uint event, const char * value, void * data); // function to call for OPT_CL_HOOK + struct cf_user_type * utype; // specification of the user-defined type for CT_USER } u; - const char letter; // short-op - byte flags; + u16 flags; // as defined below (for hooks, event mask is stored instead) byte cls; // enum opt_class byte type; // enum cf_type }; -struct opt_section { - struct opt_item * opt; -}; +/*** + * [[flags]] + * Option flags + * ------------ + * + * Each option can specify a combination of the following flags. + ***/ + +#define OPT_REQUIRED 0x1 /** The option must be always present. **/ +#define OPT_REQUIRED_VALUE 0x2 /** The option must have a value. **/ +#define OPT_NO_VALUE 0x4 /** The option must have no value. **/ +#define OPT_MAYBE_VALUE 0x8 /** The option may have a value. **/ +#define OPT_NEGATIVE 0x10 /** Reversing the effect of OPT_INC or saving @false into OPT_BOOL. **/ +#define OPT_LAST_ARG 0x40 /** Stop processing arguments after this line. **/ +#define OPT_SINGLE 0x100 /** The option must appear at most once. **/ +#define OPT_MULTIPLE 0x200 /** The option may appear multiple times; will save all the values into a simple list. **/ +#define OPT_SEEN_AS_LONG 0x400 // Used internally to signal that we currently process the long form of the option +#define OPT_BEFORE_CONFIG 0x800 /** The option may appear before a config file is loaded. **/ +#define OPT_INTERNAL 0x4000 // Used internally to ask for passing of struct opt_context to OPT_CALL -#define OPT_ITEMS .opt = ( struct opt_item[] ) /** List of sub-items. **/ +/** + * If none of these flags are specified, a default is chosen automatically + * according to option class: + * + * - `OPT_MAYBE_VALUE` for `OPT_CL_STATIC` + * - `OPT_REQUIRED_VALUE` for `OPT_CL_MULTIPLE` + * - `OPT_NO_VALUE` for `OPT_CL_BOOL`, `OPT_CL_SWITCH` and `OPT_CL_INC` + * - An error is reported in all other cases. + **/ +#define OPT_VALUE_FLAGS (OPT_REQUIRED_VALUE | OPT_NO_VALUE | OPT_MAYBE_VALUE) /*** - * Sub-items to be enclosed in OPT_ITEMS { } list - * ---------------------------------------------- - * - * OPT_HELP_OPTION declares --help and prints a line about that - * OPT_HELP prints a line into help - * OPT_HELP2 prints two strings onto a line using the same tab structure as the option listing - * OPT_BOOL declares boolean option with an auto-negation (--sth and --no-sth). It's also possible to write --sth=y/yes/true/1/n/no/false/0. - * OPT_STRING, OPT_UNS, OPT_INT declare simple string/uns/int option - * OPT_SWITCH declares one choice of a switch statement; these have common target and different `value`s; last wins unless OPT_SINGLE is set; - * parser fails if it matches an OPT_SWITCH with OPT_SINGLE set and also target set. - * Target must be of signed integer type; it is set to -1 if no switch appears at the command-line. - * OPT_CALL calls the given function with an argument, giving also the opt_item structure and some custom data. - * OPT_USER declares a custom type of value defined by the given @cf_user_type in @ttype - * OPT_INC declares an incremental value like -v/--verbose - * OPT_SECTION declares a subsection + * [[macros]] + * Macros for declaration of options + * --------------------------------- * + * In most cases, option definitions are built using these macros. ***/ -#define OPT_HELP_OPTION OPT_CALL(0, "help", opt_show_help_internal, NULL, OPT_NO_VALUE, "Show this help") +/** Used inside `struct opt_section` to start a list of items. **/ +#define OPT_ITEMS .opt = ( struct opt_item[] ) + +/** No option, just a piece of help text. **/ #define OPT_HELP(line) { .help = line, .cls = OPT_CL_HELP } -#define OPT_BOOL(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = &target, .help = desc, .flags = fl, .cls = OPT_CL_BOOL, .type = CT_INT } + +/** Standard `--help` option. **/ +#define OPT_HELP_OPTION OPT_CALL(0, "help", opt_handle_help, NULL, OPT_BEFORE_CONFIG | OPT_INTERNAL | OPT_NO_VALUE, "\tShow this help") + +/** Boolean option. @target should be a variable of type `int`. **/ +#define OPT_BOOL(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, int *), .help = desc, .flags = fl, .cls = OPT_CL_BOOL, .type = CT_INT } + +/** String option. @target should be a variable of type `char *`. **/ #define OPT_STRING(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, char **), .help = desc, .flags = fl, .cls = OPT_CL_STATIC, .type = CT_STRING } -#define OPT_U64(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, u64 *), .help = desc, .flags = fl, .cls = OPT_CL_STATIC, .type = CT_U64 } + +/** Ordinary integer option. @target should be a variable of type `int`. **/ #define OPT_INT(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, int *), .help = desc, .flags = fl, .cls = OPT_CL_STATIC, .type = CT_INT } + +/** Unsigned integer option. @target should be a variable of type `uint`. **/ +#define OPT_UINT(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, uint *), .help = desc, .flags = fl, .cls = OPT_CL_STATIC, .type = CT_INT } + +/** 64-bit integer option. @target should be a variable of type `u64`. **/ +#define OPT_U64(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, u64 *), .help = desc, .flags = fl, .cls = OPT_CL_STATIC, .type = CT_U64 } + +/** Floating-point option. @target should be a variable of type `double`. **/ #define OPT_DOUBLE(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, double *), .help = desc, .flags = fl, .cls = OPT_CL_STATIC, .type = CT_DOUBLE } + +/** IP address option, currently IPv4 only. @target should be a variable of type `u32`. **/ #define OPT_IP(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, u32 *), .help = desc, .flags = fl, .cls = OPT_CL_STATIC, .type = CT_IP } + +/** Multi-valued string option. @target should be a growing array of `char *`s. **/ +#define OPT_STRING_MULTIPLE(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, char ***), .help = desc, .flags = fl, .cls = OPT_CL_MULTIPLE, .type = CT_STRING } + +/** Multi-valued integer option. @target should be a growing array of `int`s. **/ +#define OPT_INT_MULTIPLE(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, int **), .help = desc, .flags = fl, .cls = OPT_CL_MULTIPLE, .type = CT_INT } + +/** Multi-valued unsigned integer option. @target should be a growing array of `uint`s. **/ +#define OPT_UINT_MULTIPLE(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, uint **), .help = desc, .flags = fl, .cls = OPT_CL_MULTIPLE, .type = CT_INT } + +/** Multi-valued 64-bit integer option. @target should be a growing array of `u64`s. **/ +#define OPT_U64_MULTIPLE(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, u64 **), .help = desc, .flags = fl, .cls = OPT_CL_MULTIPLE, .type = CT_U64 } + +/** Multi-valued floating-point option. @target should be a growing array of `double`s. **/ +#define OPT_DOUBLE_MULTIPLE(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, double **), .help = desc, .flags = fl, .cls = OPT_CL_MULTIPLE, .type = CT_DOUBLE } + +/** Multi-valued IPv4 address option. @target should be a growing array of `u32`s. **/ +#define OPT_IP_MULTIPLE(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, u32 **), .help = desc, .flags = fl, .cls = OPT_CL_MULTIPLE, .type = CT_IP } + +/** Switch option. @target should be a variable of type `int` and it will be set to the value @val. **/ #define OPT_SWITCH(shortopt, longopt, target, val, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, int *), .help = desc, .flags = fl, .cls = OPT_CL_SWITCH, .type = CT_LOOKUP, .u.value = val } + +/** Incrementing option. @target should be a variable of type `int`. **/ +#define OPT_INC(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = CHECK_PTR_TYPE(&target, int *), .flags = fl, .help = desc, .cls = OPT_CL_INC, .type = CT_INT } + +/* FIXME: Backwards compatibility only, should not be used anymore. */ +#define OPT_UNS OPT_UINT +#define OPT_UNS_MULTIPLE OPT_UINT_MULTIPLE + + +/** + * When this option appears, call the function @fn with parameters @item, @value, @data, + * where @item points to the <> of this option, + * @value contains the current argument of the option (NULL if there is none), + * and @data is specified here. + **/ #define OPT_CALL(shortopt, longopt, fn, data, fl, desc) { .letter = shortopt, .name = longopt, .ptr = data, .help = desc, .u.call = fn, .flags = fl, .cls = OPT_CL_CALL, .type = CT_USER } -#define OPT_USER(shortopt, longopt, target, ttype, fl, desc) { .letter = shortopt, .name = longopt, .ptr = &target, .u.utype = &ttype, .flags = fl, .help = desc, .cls = OPT_CL_USER, .type = CT_USER } -#define OPT_INC(shortopt, longopt, target, fl, desc) { .letter = shortopt, .name = longopt, .ptr = &target, .flags = fl, .help = desc, .cls = OPT_CL_INC, .type = CT_INT } + +/** + * An option with user-defined syntax. @ttype is a <> + * describing the syntax, @target is a variable of the corresponding type. If the @OPT_REQUIRED_VALUE + * flag is not set, the parser must be able to parse a NULL value. + **/ +#define OPT_USER(shortopt, longopt, target, ttype, fl, desc) { .letter = shortopt, .name = longopt, .ptr = &target, .u.utype = &ttype, .flags = fl, .help = desc, .cls = OPT_CL_STATIC, .type = CT_USER } + +/** Multi-valued option of user-defined type. @target should be a growing array of the right kind of items. **/ +#define OPT_USER_MULTIPLE(shortopt, longopt, target, ttype, fl, desc) { .letter = shortopt, .name = longopt, .ptr = &target, .u.utype = &ttype, .flags = fl, .help = desc, .cls = OPT_CL_MULTIPLE, .type = CT_USER } + +/** A sub-section. **/ #define OPT_SECTION(sec) { .cls = OPT_CL_SECTION, .u.section = &sec } + +/** Declares a <> to call upon any event from the specified set. **/ +#define OPT_HOOK(fn, data, events) { .cls = OPT_CL_HOOK, .u.hook = fn, .flags = events, .ptr = data } + +/** A terminator signalling the end of the option list. **/ #define OPT_END { .cls = OPT_CL_END } /*** - * Flags for the preceeding calls - * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * [[positional]] + * Positional arguments + * -------------------- + * + * In addition to short and long options, the parser can also process 'positional + * arguments', which don't start with a dash and whose meaning depends solely on + * their position. + * + * Positional arguments are declared as options with short name `OPT_POSITIONAL(n)` + * (where `n` is the position of the argument, starting with 1) and long name + * NULL. To accept an arbitrary number of positional arguments, use + * `OPT_POSITIONAL_TAIL` instead, which matches all arguments, for which no + * `OPT_POSITIONAL` is defined. (In the latter case, you probably want to define + * the argument as `OPT_MULTIPLE` or `OPT_CALL`, so that the values do not + * overwrite each other.) + * + * Options and positional arguments can be mixed arbitrarily. When a `--` appears + * as an argument, it is understood as a signal that all other arguments are + * positional. + * + * `OPT_REQUIRED` can be used with positional arguments, but all required arguments + * must come before the non-required ones. When `OPT_POSITIONAL_TAIL` is declared + * required, it means that it must match at least once. + * + * Ordering of positional arguments within the list of options need not match + * their positions. Holes in position numbering are inadvisable. ***/ -#define OPT_REQUIRED 0x1 /** Argument must appear at the command line **/ -#define OPT_REQUIRED_VALUE 0x2 /** Argument must have a value **/ -#define OPT_NO_VALUE 0x4 /** Argument must have no value **/ -#define OPT_MAYBE_VALUE 0x8 /** Argument may have a value **/ -#define OPT_VALUE_FLAGS (OPT_REQUIRED_VALUE | OPT_NO_VALUE | OPT_MAYBE_VALUE) -#define OPT_NEGATIVE 0x10 /** Reversing the effect of OPT_INC or saving @false into OPT_BOOL **/ -#define OPT_SINGLE 0x20 /** Argument must appear at most once **/ -#define OPT_NO_HELP 0x40 /** Omit this line from help **/ -#define OPT_LAST_ARG 0x80 /** Stop processing argv after this line **/ +#define OPT_POSITIONAL(n) (OPT_POSITIONAL_TAIL+(n)) +#define OPT_POSITIONAL_TAIL 128 /*** - * Value flags defaults - * ~~~~~~~~~~~~~~~~~~~~ - * - * OPT_NO_VALUE for OPT_BOOL, OPT_SWITCH and OPT_INC - * OPT_MAYBE_VALUE for OPT_STRING, OPT_UNS, OPT_INT - * Some of the value flags (OPT_NO_VALUE, OPT_MAYBE_VALUE, OPT_REQUIRED_VALUE) - * must be specified for OPT_CALL and OPT_USER. + * [[func]] + * Functions + * --------- ***/ -static uns opt_default_value_flags[] = { - [OPT_CL_BOOL] = OPT_NO_VALUE, - [OPT_CL_STATIC] = OPT_MAYBE_VALUE, - [OPT_CL_SWITCH] = OPT_NO_VALUE, - [OPT_CL_INC] = OPT_NO_VALUE, - [OPT_CL_CALL] = 0, - [OPT_CL_USER] = 0, - [OPT_CL_SECTION] = 0, - [OPT_CL_HELP] = 0 -}; +/** + * Parse all arguments, given in a NULL-terminated array of strings. + * + * Typically, this is called from `main(argc, argv)` as `opt_parse(options, argv+1)`, + * skipping the 0th argument, which contains program name. + * + * Returns the number of arguments used (which need not be all of them + * if `OPT_LAST_ARG` was encountered). + * + * The argument array is left untouched. + * However, option values are not necessarily copied, the variables + * set by the parser may point to the argument array. + **/ +int opt_parse(const struct opt_section * options, char ** argv); -extern const struct opt_section * opt_section_root; -void opt_help_noexit_internal(const struct opt_section * help); +/** + * Report parsing failure, suggest `--help`, and abort the program with + * exit code 2. + **/ +void opt_failure(const char * mesg, ...) FORMAT_CHECK(printf,1,2) NONRET; -static void opt_help_noexit(void) { - opt_help_noexit_internal(opt_section_root); -} +void opt_help(const struct opt_section * sec); +void opt_handle_help(struct opt_item * opt, const char * value, void * data); -static void opt_usage_noexit(void) { - fprintf(stderr, "Run with argument --help for more information.\n"); -} +/*** + * [[conf]] + * Cooperating with config file parser + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * Parsing of command-line options and configuration files are usually + * intertwined in a somewhat tricky way. We want to provide command-line + * options that control the name of the configuration file, or possibly to + * override configuration settings from the command line. On the other hand, + * regular command-line options can refer to values loaded from the + * program's configuration. + * + * To achieve this goal, the option parser is able to cooperate with the + * config file parser. This is enabled by listing the `OPT_CONF_OPTIONS` + * macro in the list of command-line options. + * + * The following options are defined for you: + * + * - `-C` (`--config`) to load a specific configuration file. This option + * suppresses loading of the default configuration, but it can be given + * multiple times to merge settings from several files. + * + * - `-S` (`--set`) to include a part of configuration inline. For example, + * you can use `-Ssection.item=value` to change a single configuration item. + * + * - `--dumpconfig` to dump the configuration to standard output and exit. + * (This is available only if the program is compiled with `CONFIG_UCW_DEBUG`.) + * + * The default configuration file (as specified by <>) is loaded + * as soon as the first option different from `-C` is encountered, unless + * a different file has been already loaded. For this reason, `-C` must be + * the very first argument given to the program. + * + * This interface supersedes <>. + ***/ -static void opt_show_help_internal(struct opt_item * opt UNUSED, const char * value UNUSED, void * data UNUSED) { - opt_help_noexit(); - exit(0); -} +#ifdef CONFIG_UCW_DEBUG +#define OPT_CONF_OPTIONS OPT_CONF_CONFIG, OPT_CONF_SET, OPT_CONF_DUMPCONFIG, OPT_CONF_HOOK +#else +#define OPT_CONF_OPTIONS OPT_CONF_CONFIG, OPT_CONF_SET, OPT_CONF_HOOK +#endif -static void opt_help(void) { - opt_help_noexit(); - exit(1); -} +#define OPT_CONF_CONFIG OPT_CALL('C', "config", opt_handle_config, NULL, OPT_BEFORE_CONFIG | OPT_INTERNAL | OPT_REQUIRED_VALUE, "\tOverride the default configuration file") +#define OPT_CONF_SET OPT_CALL('S', "set", opt_handle_set, NULL, OPT_BEFORE_CONFIG | OPT_INTERNAL | OPT_REQUIRED_VALUE, "\tManual setting of a configuration item") +#define OPT_CONF_DUMPCONFIG OPT_CALL(0, "dumpconfig", opt_handle_dumpconfig, NULL, OPT_INTERNAL | OPT_NO_VALUE, "\tDump program configuration") +#define OPT_CONF_HOOK OPT_HOOK(opt_conf_hook_internal, NULL, OPT_HOOK_BEFORE_VALUE | OPT_HOOK_FINAL | OPT_HOOK_INTERNAL) -static void opt_usage(void) { - opt_usage_noexit(); - exit(1); -} +void opt_handle_config(struct opt_item * opt, const char * value, void * data); +void opt_handle_set(struct opt_item * opt, const char * value, void * data); +void opt_handle_dumpconfig(struct opt_item * opt, const char * value, void * data); +void opt_conf_hook_internal(struct opt_item * opt, uint event, const char * value, void * data); +// XXX: This is duplicated with , but that one will hopefully go away one day. /** - * Positional argument handler to be given to opt_parse() - **/ -typedef void opt_positional(const char * str); - + * The name of the default configuration file (NULL if configuration has been + * already loaded). It is initialized to `CONFIG_UCW_DEFAULT_CONFIG`, but you + * usually want to replace it by your own config file. + */ +extern char *cf_def_file; /** - * Parse all the arguments. Run the @callback for each of the positional argument. + * Name of environment variable that can override what configuration is loaded. + * Defaults to the value of the `CONFIG_UCW_ENV_VAR_CONFIG` compile-time option. **/ -void opt_parse(const struct opt_section * options, char ** argv, opt_positional * callback); +extern char *cf_env_file; + +/*** + * [[hooks]] + * Hooks + * ----- + * + * You can supply hook functions, which will be called by the parser upon various + * events. Hooks are declared as option items of class `OPT_CL_HOOK`, whose @flags + * field specifies a mask of events the hook wants to receive. + * + * Please note that the hook interface is not considered stable yet, + * so it might change in future versions of libucw. + * + * The following events are defined: + ***/ + +#define OPT_HOOK_BEFORE_ARG 0x1 /** Call before option parsing **/ +#define OPT_HOOK_BEFORE_VALUE 0x2 /** Call before value parsing **/ +#define OPT_HOOK_AFTER_VALUE 0x4 /** Call after value parsing **/ +#define OPT_HOOK_FINAL 0x8 /** Call just before @opt_parse() returns **/ +#define OPT_HOOK_INTERNAL 0x4000 // Used internally to ask for passing of struct opt_context #endif