unsigned char search(unsigned char *puchMsg, unsigned char start, unsigned char max_len) {
unsigned char i = 0;

puchMsg += start; //

while ( ((*puchMsg) != 0x20) && (puchMsg < max_len) ) { puchMsg++; i++; } //
return i;
}

main {
unsigned char last_position;
unsigned char *temp_ptr;

last_position = 0; //
temp_ptr = &mas[Read_Layer][0];


last_position = search(temp_ptr, 0, MAS_LEN);
}

Явных ляпов нет?