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-rw-r--r--dummyflasher.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/dummyflasher.c b/dummyflasher.c
index 0f62d16..8ebd695 100644
--- a/dummyflasher.c
+++ b/dummyflasher.c
@@ -38,7 +38,8 @@ int dummy_init(void)
programmer_param = strdup("parallel,lpc,fwh,spi");
/* Convert the parameters to lowercase. */
for (i = 0; programmer_param[i] != '\0'; i++)
- programmer_param[i] = (char)tolower(programmer_param[i]);
+ programmer_param[i] =
+ (char)tolower((unsigned char)programmer_param[i]);
buses_supported = CHIP_BUSTYPE_NONE;
if (strstr(programmer_param, "parallel")) {
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