mirror of
https://github.com/netwide-assembler/nasm.git
synced 2024-12-03 08:41:02 +08:00
b756372b06
Otherwise we may hit underfined behavior. https://bugzilla.nasm.us/show_bug.cgi?id=3392526 Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
71 lines
2.6 KiB
C
71 lines
2.6 KiB
C
/* ----------------------------------------------------------------------- *
|
|
*
|
|
* Copyright 1996-2016 The NASM Authors - All Rights Reserved
|
|
* See the file AUTHORS included with the NASM distribution for
|
|
* the specific copyright holders.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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 THE COPYRIGHT OWNER OR
|
|
* CONTRIBUTORS 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.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* rdstrnum.c
|
|
*
|
|
* This converts a NASM string to an integer, used when a string
|
|
* is used in an integer constant context. This is a binary conversion,
|
|
* not a conversion from a numeric constant in text form.
|
|
*/
|
|
|
|
#include "compiler.h"
|
|
#include "nasmlib.h"
|
|
#include "nasm.h"
|
|
|
|
int64_t readstrnum(char *str, int length, bool *warn)
|
|
{
|
|
int64_t charconst = 0;
|
|
int i;
|
|
|
|
*warn = false;
|
|
|
|
str += length;
|
|
if (globalbits == 64) {
|
|
for (i = 0; i < length; i++) {
|
|
if (charconst & UINT64_C(0xFF00000000000000))
|
|
*warn = true;
|
|
charconst &= ~UINT64_C(0xFF00000000000000);
|
|
charconst = (charconst << 8) + (uint8_t)*--str;
|
|
}
|
|
} else {
|
|
for (i = 0; i < length; i++) {
|
|
if (charconst & UINT32_C(0xFF000000))
|
|
*warn = true;
|
|
charconst &= ~UINT32_C(0xFF000000);
|
|
charconst = (charconst << 8) + (uint8_t)*--str;
|
|
}
|
|
}
|
|
return charconst;
|
|
}
|