mirror of
https://github.com/netwide-assembler/nasm
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6251fc5908
buflen == 0 is an error, but be paranoid about it; the code already checks for a valid base so it is better to check for a valid buffer size as well. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/* Copyright 2023-2025 The NASM Authors - All Rights Reserved */
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#include "nasmlib.h"
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const char * const nasmlib_digit_chars[2] = {
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/* Lower case version */
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"0123456789"
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"abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"@_",
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/* Upper case version */
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"0123456789"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"@_"
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};
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/*
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* Produce an unsigned integer string from a number with a specified
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* base, digits and signedness.
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*/
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int numstr(char *buf, size_t buflen, uint64_t n,
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int digits, unsigned int base, bool ucase)
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{
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const char * const dchars = nasm_digit_chars(ucase);
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bool moredigits = digits <= 0;
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char *p;
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int len;
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if (unlikely(base < 2) || unlikely(base > NUMSTR_MAXBASE) ||
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unlikely(!buflen))
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return -1;
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if (moredigits)
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digits = -digits;
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p = buf + buflen;
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*--p = '\0';
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while (p > buf && (digits-- > 0 || (moredigits && n))) {
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*--p = dchars[n % base];
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n /= base;
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}
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len = buflen - (p - buf); /* Including final null */
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if (p != buf)
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memmove(buf, p, len);
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return len - 1;
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}
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