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replace sprintf with custom loop

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matthias.ringwald@gmail.com 2014-01-19 17:38:12 +00:00
parent 2e97921ee0
commit ffb495ea4a
1 changed files with 18 additions and 1 deletions
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19
src/utils.c
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@ -99,9 +99,26 @@ void printUUID(uint8_t *uuid) {
uuid[8], uuid[9], uuid[10], uuid[11], uuid[12], uuid[13], uuid[14], uuid[15]);
}
char char_for_nibble(int nibble){
if (nibble < 10) return '0' + nibble;
nibble -= 10;
if (nibble < 6) return 'A' + nibble;
return '?';
}
static char bd_addr_to_str_buffer[6*3]; // 12:45:78:01:34:67\0
char * bd_addr_to_str(bd_addr_t addr){
sprintf(bd_addr_to_str_buffer, "%02x:%02x:%02x:%02x:%02x:%02x", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
// orig code
// sprintf(bd_addr_to_str_buffer, "%02x:%02x:%02x:%02x:%02x:%02x", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
// sprintf-free code
char * p = bd_addr_to_str_buffer;
int i;
for (i = 0; i < 6 ; i++) {
*p++ = char_for_nibble((addr[i] >> 4) & 0x0F);
*p++ = char_for_nibble((addr[i] >> 0) & 0x0F);
*p++ = ':';
}
*--p = 0;
return (char *) bd_addr_to_str_buffer;
}