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Update hex.h #11

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Update hex.h #11

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5 changes: 4 additions & 1 deletion hex.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,10 @@ static const char hex_table[256] = {

static inline int char_to_hex(unsigned char *val, int c)
{
if (hex_table[(int)c] || c == '0') {
if (c < 0 || c > 255) {
return 0; // or handle the error as appropriate for your application
}
if (hex_table[c] || c == '0') {
*val = hex_table[c];
return 1;
}
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