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Jacob Erlbeck jerlbeck at sysmocom.deDear Holger On 02.03.2014 08:06, Holger Hans Peter Freyther wrote: > >> + nchars = snprintf(buf + buf_offs, sizeof(buf) - buf_offs, >> + "%s[L%d]> ", >> + osmo_hexdump(start, lxhs[i] - start), >> + i+1); > >> + nchars = snprintf(buf + buf_offs, sizeof(buf) - buf_offs, >> + "%s", osmo_hexdump(start, msg->tail - start)); >> + nchars = snprintf(buf, sizeof(buf) - buf_offs, >> + "!!! L%d out of range", i+1); > > So sizeof(buf) - buf_offs can only be 0 when the output is already null > terminated? No, the expressions can never be 0 due to if (nchars < 0 || nchars + buf_offs >= sizeof(buf)) return "ERROR"; But even if it could, the string has already been \0 terminated by prior calls to snprintf (the initial size value is always > 0). Jacob > > kind regards > holger >