* There are basically two forms of options:
'Short options' consist of one dash (`-`) and one alphanumeric
character.
- 'Long options' begin with two dashes (`\--`) and some
+ 'Long options' begin with two dashes (`--`) and some
alphanumeric characters.
* Options are case-sensitive.
* 'sticked' and 'separate form' of options with arguments.
`-oArg` is sticked, `-o Arg` is separate form.
- `\--option=Arg` is sticked, `\--option Arg` is separate form.
+ `--option=Arg` is sticked, `--option Arg` is separate form.
* Long options may be 'abbreviated', as long as the abbreviation
is unambiguous.
* Short options may be bundled, e.g. `-a -b` can be specified as `-ab`.
* Boolean long options can be 'negated' (or 'unset') by prepending
- `no-`, e.g. `\--no-abbrev` instead of `\--abbrev`. Conversely,
+ `no-`, e.g. `--no-abbrev` instead of `--abbrev`. Conversely,
options that begin with `no-` can be 'negated' by removing it.
-* Options and non-option arguments can clearly be separated using the `\--`
- option, e.g. `-a -b \--option \-- \--this-is-a-file` indicates that
- `\--this-is-a-file` must not be processed as an option.
+* Options and non-option arguments can clearly be separated using the `--`
+ option, e.g. `-a -b --option -- --this-is-a-file` indicates that
+ `--this-is-a-file` must not be processed as an option.
Steps to parse options
----------------------
Flags are the bitwise-or of:
`PARSE_OPT_KEEP_DASHDASH`::
- Keep the `\--` that usually separates options from
+ Keep the `--` that usually separates options from
non-option arguments.
`PARSE_OPT_STOP_AT_NON_OPTION`::
There are some macros to easily define options:
`OPT__ABBREV(&int_var)`::
- Add `\--abbrev[=<n>]`.
+ Add `--abbrev[=<n>]`.
`OPT__COLOR(&int_var, description)`::
- Add `\--color[=<when>]` and `--no-color`.
+ Add `--color[=<when>]` and `--no-color`.
`OPT__DRY_RUN(&int_var, description)`::
- Add `-n, \--dry-run`.
+ Add `-n, --dry-run`.
`OPT__FORCE(&int_var, description)`::
- Add `-f, \--force`.
+ Add `-f, --force`.
`OPT__QUIET(&int_var, description)`::
- Add `-q, \--quiet`.
+ Add `-q, --quiet`.
`OPT__VERBOSE(&int_var, description)`::
- Add `-v, \--verbose`.
+ Add `-v, --verbose`.
`OPT_GROUP(description)`::
Start an option group. `description` is a short string that
If not stated otherwise, interpret the arguments as follows:
* `short` is a character for the short option
- (e.g. `{apostrophe}e{apostrophe}` for `-e`, use `0` to omit),
+ (e.g. `'e'` for `-e`, use `0` to omit),
* `long` is a string for the long option
- (e.g. `"example"` for `\--example`, use `NULL` to omit),
+ (e.g. `"example"` for `--example`, use `NULL` to omit),
* `int_var` is an integer variable,
The callback mechanism is as follows:
* Inside `func`, the only interesting member of the structure
- given by `opt` is the void pointer `opt\->value`.
- `\*opt\->value` will be the value that is saved into `var`, if you
+ given by `opt` is the void pointer `opt->value`.
+ `*opt->value` will be the value that is saved into `var`, if you
use `OPT_CALLBACK()`.
- For example, do `*(unsigned long *)opt\->value = 42;` to get 42
+ For example, do `*(unsigned long *)opt->value = 42;` to get 42
into an `unsigned long` variable.
* Return value `0` indicates success and non-zero return