Merge branch 'kbuild/kconfig/kbuild-generic-v7' of http://github.com/lacombar/linux-2.6 into kbuild/kconfig

* 'kbuild/kconfig/kbuild-generic-v7' of http://github.com/lacombar/linux-2.6:
  kbuild: migrate all arch to the kconfig mainmenu upgrade
  kconfig: expand file names
  kconfig: use the file's name of sourced file
  kconfig: constify file name
  kconfig: don't emit warning upon rootmenu's prompt redefinition
  kconfig: replace KERNELVERSION usage by the mainmenu's prompt
  kconfig: delay gconf window initialization
  kconfig: expand by default the rootmenu's prompt
  kconfig: add a symbol string expansion helper
  kconfig: regen parser
  kconfig: implement the `mainmenu' directive
  kconfig: allow PACKAGE to be defined on the compiler's command-line
  kconfig: rephrase help texts/comments not to include the package name
  kconfig: allow build-time definition of the internal config prefix
  kconfig: rephrase help text not to mention the internal prefix
  kconfig: replace a `switch()' statement by a more flexible `if()' statement

1 files changed, 49 insertions, 0 deletions

diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index 943712ca6c0a..dc5dcf2189a0 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -840,6 +840,55 @@ struct symbol *sym_find(const char *name)
         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;