common, itest: pass u-boot env variables to itest.s

compare two U-Boot Environment variables with itest.s, example:

=> print tmp ver
tmp=U-Boot 2013.10-g75e
ver=U-Boot 2013.10-g75eb4bc (Jan 21 2014 - 10:35:39)MPC83XX
=> print check_ub_ver
check_ub_ver=if itest.s \${tmp} == \${ver}; then echo equal; else echo diff ;fi
=> run check_ub_ver
diff
=> setenv tmp U-Boot 2013.10-g75eb4bc (Jan 21 2014 - 10:35:39)MPC83XX
=> print tmp ver
tmp=U-Boot 2013.10-g75eb4bc (Jan 21 2014 - 10:35:39)MPC83XX
ver=U-Boot 2013.10-g75eb4bc (Jan 21 2014 - 10:35:39)MPC83XX
=> run check_ub_ver
equal

Signed-off-by: Heiko Schocher <hs@denx.de>

diff --git a/common/cmd_itest.c b/common/cmd_itest.c
index 29f8076..ae2527b 100644 (file)
--- a/common/cmd_itest.c
+++ b/common/cmd_itest.c
@@ -71,6 +71,19 @@ static char * evalstr(char *s)
        /* if the parameter starts with a * then assume a string pointer else its a literal */
        if (s[0] == '*') {
                return (char *)simple_strtoul(&s[1], NULL, 16);
+       } else if (s[0] == '$') {
+               int i = 2;
+
+               if (s[1] != '{')
+                       return NULL;
+
+               while (s[i] != '}') {
+                       if (s[i] == 0)
+                               return NULL;
+                       i++;
+               }
+               s[i] = 0;
+               return  getenv((const char *)&s[2]);
        } else {
                return s;
        }