tools/env: Fix variable delete operation

Fix crash introduced by a073d63a36524453a817ab029fad5b188f46127e
when attempting to delete a variable.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index ab8c15d..97328bb 100644 (file)
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -494,6 +494,8 @@ int fw_setenv(int argc, char *argv[])
                char *val = argv[i];
                size_t val_len = strlen(val);
 
+               if (value)
+                       value[len - 1] = ' ';
                value = realloc(value, len + val_len + 1);
                if (!value) {
                        fprintf(stderr,
@@ -504,9 +506,8 @@ int fw_setenv(int argc, char *argv[])
 
                memcpy(value + len, val, val_len);
                len += val_len;
-               value[len++] = ' ';
+               value[len++] = '\0';
        }
-       value[len - 1] = '\0';
 
        fw_env_write(name, value);