mirror of
https://github.com/netwide-assembler/nasm.git
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a8bcdb641b
The idea of putting the warnings in the source code was a nice one, really, but it ended up being a nightmare from the perspective of build dependencies. Disaggregate them, and tweak the documentation for easier reading. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/* Copyright 1996-2025 The NASM Authors - All Rights Reserved */
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/*
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* nasmlib.c library routines for the Netwide Assembler
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*/
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#include "compiler.h"
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#include "nctype.h"
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#include "nasmlib.h"
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#include "error.h"
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#include "nasm.h" /* For globl.dollarhex */
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#define lib_isnumchar(c) (nasm_isalnum(c) || (c) == '$' || (c) == '_')
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void warn_dollar_hex(void)
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{
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nasm_warn(WARN_NUMBER_DEPRECATED_HEX,
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"$ prefix for hexadecimal is deprecated");
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}
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int64_t readnum(const char *str, bool *error)
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{
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const char *r = str, *q;
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int32_t pradix, sradix, radix;
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int plen, slen, len;
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uint64_t result, checklimit;
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int digit, last;
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bool warn = false;
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int sign = 1;
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if (error)
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*error = true;
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while (nasm_isspace(*r))
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r++; /* find start of number */
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/*
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* If the number came from make_tok_num (as a result of an %assign), it
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* might have a '-' built into it (rather than in a preceding token).
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*/
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if (*r == '-') {
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r++;
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sign = -1;
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}
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q = r;
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while (lib_isnumchar(*q))
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q++; /* find end of number */
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len = q-r;
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if (!len) {
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/* Not numeric */
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return 0;
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}
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/*
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* Handle radix formats:
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*
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* 0<radix-letter><string>
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* $<string> (hexadecimal)
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* <string><radix-letter>
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*/
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pradix = sradix = 0;
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plen = slen = 0;
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if (len > 2 && *r == '0' && (pradix = radix_letter(r[1])) != 0) {
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plen = 2;
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} else if (len > 1 && *r == '$' && globl.dollarhex) {
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/* Warning here would probably duplicate warnings */
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pradix = 16, plen = 1;
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}
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if (len > 1 && (sradix = radix_letter(q[-1])) != 0)
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slen = 1;
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if (pradix > sradix) {
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radix = pradix;
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r += plen;
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} else if (sradix > pradix) {
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radix = sradix;
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q -= slen;
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} else {
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/* Either decimal, or invalid -- if invalid, we'll trip up
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further down. */
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radix = 10;
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}
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/*
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* `checklimit' must be 2**64 / radix. We can't do that in
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* 64-bit arithmetic, which we're (probably) using, so we
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* cheat: since we know that all radices we use are even, we
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* can divide 2**63 by radix/2 instead.
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*/
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checklimit = UINT64_C(0x8000000000000000) / (radix >> 1);
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/*
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* Calculate the highest allowable value for the last digit of a
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* 64-bit constant... in radix 10, it is 6, otherwise it is 0
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*/
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last = (radix == 10 ? 6 : 0);
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result = 0;
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while (*r && r < q) {
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if (*r != '_') {
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if (*r < '0' || (*r > '9' && *r < 'A')
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|| (digit = numvalue(*r)) >= radix) {
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return 0;
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}
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if (result > checklimit ||
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(result == checklimit && digit >= last)) {
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warn = true;
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}
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result = radix * result + digit;
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}
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r++;
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}
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if (warn) {
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nasm_warn(WARN_NUMBER_OVERFLOW,
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"numeric constant %s does not fit in 64 bits",
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str);
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}
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if (error)
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*error = false;
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return result * sign;
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}
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