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