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- /*
- * 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 <stdarg.h>
- #include <stdio.h>
- #include <string.h>
- 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;
- }
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