Merge branch 'ps/parse-options-integers'

Update parse-options API to catch mistakes to pass address of an
integral variable of a wrong type/size.

* ps/parse-options-integers:
  parse-options: detect mismatches in integer signedness
  parse-options: introduce precision handling for `OPTION_UNSIGNED`
  parse-options: introduce precision handling for `OPTION_INTEGER`
  parse-options: rename `OPT_MAGNITUDE()` to `OPT_UNSIGNED()`
  parse-options: support unit factors in `OPT_INTEGER()`
  global: use designated initializers for options
  parse: fix off-by-one for minimum signed values

apply.c

@@ -5123,8 +5123,8 @@ int apply_parse_options(int argc, const char **argv,
 		/* Think twice before adding "--nul" synonym to this */
 		OPT_SET_INT('z', NULL, &state->line_termination,
 			N_("paths are separated with NUL character"), '\0'),
-		OPT_INTEGER('C', NULL, &state->p_context,
-				N_("ensure at least <n> lines of context match")),
+		OPT_UNSIGNED('C', NULL, &state->p_context,
+			     N_("ensure at least <n> lines of context match")),
 		OPT_CALLBACK(0, "whitespace", state, N_("action"),
 			N_("detect new or modified lines that have whitespace errors"),
 			apply_option_parse_whitespace),