kconfig: add a symbol string expansion helper
Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Michal Marek <mmarek@suse.cz>
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index 943712c..dc5dcf2 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -840,6 +840,55 @@
return symbol;
}
+/*
+ * Expand symbol's names embedded in the string given in argument. Symbols'
+ * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
+ * the empty string.
+ */
+const char *sym_expand_string_value(const char *in)
+{
+ const char *src;
+ char *res;
+ size_t reslen;
+
+ reslen = strlen(in) + 1;
+ res = malloc(reslen);
+ res[0] = '\0';
+
+ while ((src = strchr(in, '$'))) {
+ char *p, name[SYMBOL_MAXLENGTH];
+ const char *symval = "";
+ struct symbol *sym;
+ size_t newlen;
+
+ strncat(res, in, src - in);
+ src++;
+
+ p = name;
+ while (isalnum(*src) || *src == '_')
+ *p++ = *src++;
+ *p = '\0';
+
+ sym = sym_find(name);
+ if (sym != NULL) {
+ sym_calc_value(sym);
+ symval = sym_get_string_value(sym);
+ }
+
+ newlen = strlen(res) + strlen(symval) + strlen(src);
+ if (newlen > reslen) {
+ reslen = newlen;
+ realloc(res, reslen);
+ }
+
+ strcat(res, symval);
+ in = src;
+ }
+ strcat(res, in);
+
+ return res;
+}
+
struct symbol **sym_re_search(const char *pattern)
{
struct symbol *sym, **sym_arr = NULL;