/* * Copyright (C) 2008 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "utils.h" #include #include #include char* buff_addc (char* buff, char* buffEnd, int c) { int avail = buffEnd - buff; if (avail <= 0) /* already in overflow mode */ return buff; if (avail == 1) { /* overflowing, the last byte is reserved for zero */ buff[0] = 0; return buff + 1; } buff[0] = (char) c; /* add char and terminating zero */ buff[1] = 0; return buff + 1; } char* buff_adds (char* buff, char* buffEnd, const char* s) { int slen = strlen(s); return buff_addb(buff, buffEnd, s, slen); } char* buff_addb (char* buff, char* buffEnd, const void* data, int len) { int avail = (buffEnd - buff); if (avail <= 0 || len <= 0) /* already overflowing */ return buff; if (len > avail) len = avail; memcpy(buff, data, len); buff += len; /* ensure there is a terminating zero */ if (buff >= buffEnd) { /* overflow */ buff[-1] = 0; } else buff[0] = 0; return buff; } char* buff_add (char* buff, char* buffEnd, const char* format, ... ) { int avail; avail = (buffEnd - buff); if (avail > 0) { va_list args; int nn; va_start(args, format); nn = vsnprintf( buff, avail, format, args); va_end(args); if (nn < 0) { /* some C libraries return -1 in case of overflow, * but they will also do that if the format spec is * invalid. We assume ADB is not buggy enough to * trigger that last case. */ nn = avail; } else if (nn > avail) { nn = avail; } buff += nn; /* ensure that there is a terminating zero */ if (buff >= buffEnd) buff[-1] = 0; else buff[0] = 0; } return buff; }