diff options
Diffstat (limited to 'Documentation/technical/api-parse-options.txt')
| -rw-r--r-- | Documentation/technical/api-parse-options.txt | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/technical/api-parse-options.txt b/Documentation/technical/api-parse-options.txt index 695bd4b..27bd701 100644 --- a/Documentation/technical/api-parse-options.txt +++ b/Documentation/technical/api-parse-options.txt @@ -144,8 +144,12 @@ There are some macros to easily define options: `OPT_COUNTUP(short, long, &int_var, description)`:: Introduce a count-up option. - `int_var` is incremented on each use of `--option`, and - reset to zero with `--no-option`. + Each use of `--option` increments `int_var`, starting from zero + (even if initially negative), and `--no-option` resets it to + zero. To determine if `--option` or `--no-option` was encountered at + all, initialize `int_var` to a negative value, and if it is still + negative after parse_options(), then neither `--option` nor + `--no-option` was seen. `OPT_BIT(short, long, &int_var, description, mask)`:: Introduce a boolean option. |