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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-05-28 18:21:51 +0900 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-05-29 03:31:19 +0900 |
| commit | ed2a22f277c60308481ecea1e1b846cbf249af41 (patch) | |
| tree | de91d6e6c9f17a34aa5ef643468aca147b35d3e5 /scripts | |
| parent | 1175c02506ffc9cef9f3c520249d8740a3174b1f (diff) | |
| download | lwn-ed2a22f277c60308481ecea1e1b846cbf249af41.tar.gz lwn-ed2a22f277c60308481ecea1e1b846cbf249af41.zip | |
kconfig: support append assignment operator
Support += operator. This appends a space and the text on the
righthand side to a variable.
The timing of the evaluation of the righthand side depends on the
flavor of the variable. If the lefthand side was originally defined
as a simple variable, the righthand side is expanded immediately.
Otherwise, the expansion is deferred. Appending something to an
undefined variable results in a recursive variable.
To implement this, we need to remember the flavor of variables.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/kconfig/lkc_proto.h | 1 | ||||
| -rw-r--r-- | scripts/kconfig/preprocess.c | 28 | ||||
| -rw-r--r-- | scripts/kconfig/zconf.l | 1 |
3 files changed, 27 insertions, 3 deletions
diff --git a/scripts/kconfig/lkc_proto.h b/scripts/kconfig/lkc_proto.h index 6303193f43f2..a8b7a330587e 100644 --- a/scripts/kconfig/lkc_proto.h +++ b/scripts/kconfig/lkc_proto.h @@ -52,6 +52,7 @@ const char * prop_get_type_name(enum prop_type type); enum variable_flavor { VAR_SIMPLE, VAR_RECURSIVE, + VAR_APPEND, }; void env_write_dep(FILE *f, const char *auto_conf_name); void variable_add(const char *name, const char *value, diff --git a/scripts/kconfig/preprocess.c b/scripts/kconfig/preprocess.c index d103683b386e..56aa1f0bad04 100644 --- a/scripts/kconfig/preprocess.c +++ b/scripts/kconfig/preprocess.c @@ -222,11 +222,23 @@ void variable_add(const char *name, const char *value, enum variable_flavor flavor) { struct variable *v; + char *new_value; + bool append = false; v = variable_lookup(name); if (v) { - free(v->value); + /* For defined variables, += inherits the existing flavor */ + if (flavor == VAR_APPEND) { + flavor = v->flavor; + append = true; + } else { + free(v->value); + } } else { + /* For undefined variables, += assumes the recursive flavor */ + if (flavor == VAR_APPEND) + flavor = VAR_RECURSIVE; + v = xmalloc(sizeof(*v)); v->name = xstrdup(name); list_add_tail(&v->node, &variable_list); @@ -235,9 +247,19 @@ void variable_add(const char *name, const char *value, v->flavor = flavor; if (flavor == VAR_SIMPLE) - v->value = expand_string(value); + new_value = expand_string(value); else - v->value = xstrdup(value); + new_value = xstrdup(value); + + if (append) { + v->value = xrealloc(v->value, + strlen(v->value) + strlen(new_value) + 2); + strcat(v->value, " "); + strcat(v->value, new_value); + free(new_value); + } else { + v->value = new_value; + } } static void variable_del(struct variable *v) diff --git a/scripts/kconfig/zconf.l b/scripts/kconfig/zconf.l index 376af6cf2f65..a6cbe2d06d01 100644 --- a/scripts/kconfig/zconf.l +++ b/scripts/kconfig/zconf.l @@ -116,6 +116,7 @@ n [A-Za-z0-9_-] } "=" { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_RECURSIVE; return T_ASSIGN; } ":=" { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_SIMPLE; return T_ASSIGN; } + "+=" { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_APPEND; return T_ASSIGN; } [[:blank:]]+ . warn_ignored_character(*yytext); \n { |