1 files changed, 39 insertions, 1 deletions

diff --git a/busybox/scripts/config/symbol.c b/busybox/scripts/config/symbol.c
index a9fae9c13..ea629728a 100644
--- a/busybox/scripts/config/symbol.c
+++ b/busybox/scripts/config/symbol.c
@@ -6,6 +6,7 @@
 #include <ctype.h>
 #include <stdlib.h>
 #include <string.h>
+#include <regex.h>
 #include <sys/utsname.h>
 
 #define LKC_DIRECT_LINK
@@ -414,7 +415,7 @@ tristate sym_toggle_tristate_value(struct symbol *sym)
 
 bool sym_string_valid(struct symbol *sym, const char *str)
 {
-        char ch;
+        signed char ch;
 
         switch (sym->type) {
         case S_STRING:
@@ -649,6 +650,43 @@ struct symbol *sym_find(const char *name)
         return symbol;
 }
 
+struct symbol **sym_re_search(const char *pattern)
+{
+        struct symbol *sym, **sym_arr = NULL;
+        int i, cnt, size;
+        regex_t re;
+
+        cnt = size = 0;
+        /* Skip if empty */
+        if (strlen(pattern) == 0)
+                return NULL;
+        if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
+                return NULL;
+
+        for_all_symbols(i, sym) {
+                if (sym->flags & SYMBOL_CONST || !sym->name)
+                        continue;
+                if (regexec(&re, sym->name, 0, NULL, 0))
+                        continue;
+                if (cnt + 1 >= size) {
+                        void *tmp = sym_arr;
+                        size += 16;
+                        sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
+                        if (!sym_arr) {
+                                free(tmp);
+                                return NULL;
+                        }
+                }
+                sym_arr[cnt++] = sym;
+        }
+        if (sym_arr)
+                sym_arr[cnt] = NULL;
+        regfree(&re);
+
+        return sym_arr;
+}
+
+
 struct symbol *sym_check_deps(struct symbol *sym);
 
 static struct symbol *sym_check_expr_deps(struct expr *e)