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/*
* Copyright (c) 2009-2021, Google LLC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Google LLC nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL Google LLC BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "upb/lex/atoi.h"
// Must be last.
#include "upb/port/def.inc"
const char* upb_BufToUint64(const char* ptr, const char* end, uint64_t* val) {
uint64_t u64 = 0;
while (ptr < end) {
unsigned ch = *ptr - '0';
if (ch >= 10) break;
if (u64 > UINT64_MAX / 10 || u64 * 10 > UINT64_MAX - ch) {
return NULL; // integer overflow
}
u64 *= 10;
u64 += ch;
ptr++;
}
*val = u64;
return ptr;
}
const char* upb_BufToInt64(const char* ptr, const char* end, int64_t* val,
bool* is_neg) {
bool neg = false;
uint64_t u64;
if (ptr != end && *ptr == '-') {
ptr++;
neg = true;
}
ptr = upb_BufToUint64(ptr, end, &u64);
if (!ptr || u64 > (uint64_t)INT64_MAX + neg) {
return NULL; // integer overflow
}
*val = neg ? -u64 : u64;
if (is_neg) *is_neg = neg;
return ptr;
}
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