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![Anastasiia Lukianenko](/assets/img/avatar_default.png)
Cleaning up the following: ERROR: do not use assignment in if condition #281: FILE: drivers/xen/pvblock.c:260: + if ((err = xenbus_switch_state(XBT_NIL, nodename, CHECK:COMPARISON_TO_NULL: Comparison to NULL could be written "err" #52: FILE: drivers/xen/pvblock.c:298: + if (err != NULL) { ERROR: do not use assignment in if condition #176: FILE: drivers/xen/gnttab.c:103: + if ((flags = nflags) & (GTF_reading | GTF_writing)) { WARNING: Missing or malformed SPDX-License-Identifier tag in line 1 #329: FILE: include/xen/gnttab.h:1: +/* WARNING: Misplaced SPDX-License-Identifier tag - use line 1 instead #330: FILE: include/xen/gnttab.h:2: + * SPDX-License-Identifier: GPL-2.0 ERROR: do not use assignment in if condition #630: FILE: lib/sscanf.c:558: + if ((n = inr) < width) { Signed-off-by: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com> Reviewed-by: Simon Glass <sjg@chromium.org>
825 lines
18 KiB
C
825 lines
18 KiB
C
// SPDX-License-Identifier: BSD-3-Clause
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/*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Copyright (c) 2011 The FreeBSD Foundation
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* All rights reserved.
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* Portions of this software were developed by David Chisnall
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* under sponsorship from the FreeBSD Foundation.
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*
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* Author: Juergen Gross <jgross@suse.com>
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* Date: Jun 2016
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*/
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#if !defined HAVE_LIBC
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#include <os.h>
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#include <linux/kernel.h>
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#include <linux/ctype.h>
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#include <vsprintf.h>
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#include <linux/string.h>
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#include <malloc.h>
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#define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var))
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/**
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* struct str_info - Input string parameters
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* @neg: negative number or not
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* 0 - not negative
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* 1 - negative
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* @any: set any if any `digits' consumed; make it negative to indicate
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* overflow
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* @acc: accumulated value
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*/
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struct str_info {
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int neg, any;
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u64 acc;
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};
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/**
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* str_to_int_convert() - Write string data to structure
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* @nptr: pointer to string
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* @base: number's base
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* @unsign: describes what integer is expected
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* 0 - not unsigned
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* 1 - unsigned
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*
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* Ignores `locale' stuff. Assumes that the upper and lower case
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* alphabets and digits are each contiguous.
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*
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* Return: struct str_info *, which contains string data to future process
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*/
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static struct str_info *
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str_to_int_convert(const char **nptr, int base, unsigned int unsign)
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{
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const char *s = *nptr;
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u64 acc;
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unsigned char c;
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u64 cutoff;
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int neg, any, cutlim;
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u64 qbase;
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struct str_info *info;
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/*
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* Skip white space and pick up leading +/- sign if any.
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* If base is 0, allow 0x for hex and 0 for octal, else
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* assume decimal; if base is already 16, allow 0x.
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*/
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info = (struct str_info *)malloc(sizeof(struct str_info));
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if (!info)
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return NULL;
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do {
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c = *s++;
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} while (isspace(c));
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if (c == '-') {
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neg = 1;
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c = *s++;
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} else {
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neg = 0;
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if (c == '+')
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c = *s++;
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}
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if ((base == 0 || base == 16) &&
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c == '0' && (*s == 'x' || *s == 'X')) {
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c = s[1];
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s += 2;
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base = 16;
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}
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if (base == 0)
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base = c == '0' ? 8 : 10;
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/*
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* Compute the cutoff value between legal numbers and illegal
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* numbers. That is the largest legal value, divided by the
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* base. An input number that is greater than this value, if
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* followed by a legal input character, is too big. One that
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* is equal to this value may be valid or not; the limit
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* between valid and invalid numbers is then based on the last
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* digit. For instance, if the range for quads is
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* [-9223372036854775808..9223372036854775807] and the input base
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* is 10, cutoff will be set to 922337203685477580 and cutlim to
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* either 7 (neg==0) or 8 (neg==1), meaning that if we have
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* accumulated a value > 922337203685477580, or equal but the
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* next digit is > 7 (or 8), the number is too big, and we will
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* return a range error.
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*
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* Set any if any `digits' consumed; make it negative to indicate
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* overflow.
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*/
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qbase = (unsigned int)base;
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if (!unsign) {
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cutoff = neg ? (u64)-(LLONG_MIN + LLONG_MAX) + LLONG_MAX : LLONG_MAX;
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cutlim = cutoff % qbase;
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cutoff /= qbase;
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} else {
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cutoff = (u64)ULLONG_MAX / qbase;
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cutlim = (u64)ULLONG_MAX % qbase;
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}
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for (acc = 0, any = 0;; c = *s++) {
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if (!isascii(c))
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break;
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if (isdigit(c))
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c -= '0';
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else if (isalpha(c))
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c -= isupper(c) ? 'A' - 10 : 'a' - 10;
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else
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break;
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if (c >= base)
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break;
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if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) {
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any = -1;
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} else {
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any = 1;
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acc *= qbase;
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acc += c;
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}
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}
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info->any = any;
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info->neg = neg;
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info->acc = acc;
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*nptr = s;
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return info;
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}
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/**
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* strtoq() - Convert a string to a quad integer
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* @nptr: pointer to string
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* @endptr: pointer to number's end in the string
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* @base: number's base
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*
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* Return: s64 quad integer number converted from input string
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*/
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static s64
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strtoq(const char *nptr, char **endptr, int base)
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{
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const char *s = nptr;
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u64 acc;
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int unsign = 0;
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struct str_info *info;
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info = str_to_int_convert(&s, base, unsign);
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if (!info)
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return -1;
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acc = info->acc;
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if (info->any < 0)
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acc = info->neg ? LLONG_MIN : LLONG_MAX;
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else if (info->neg)
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acc = -acc;
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if (endptr != 0)
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*endptr = __DECONST(char *, info->any ? s - 1 : nptr);
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free(info);
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return acc;
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}
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/**
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* strtouq() - Convert a string to an unsigned quad integer
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* @nptr: pointer to string
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* @endptr: pointer to number's end in the string
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* @base: number's base
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*
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* Return: s64 unsigned quad integer number converted from
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* input string
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*/
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u64
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strtouq(const char *nptr, char **endptr, int base)
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{
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const char *s = nptr;
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u64 acc;
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int unsign = 1;
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struct str_info *info;
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info = str_to_int_convert(&s, base, unsign);
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if (!info)
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return -1;
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acc = info->acc;
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if (info->any < 0)
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acc = ULLONG_MAX;
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else if (info->neg)
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acc = -acc;
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if (endptr != 0)
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*endptr = __DECONST(char *, info->any ? s - 1 : nptr);
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free(info);
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return acc;
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}
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/**
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* __sccl() - Fill in the given table from the scanset at the given format
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* (just after `[')
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* @tab: table to fill in
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* @fmt: format of buffer
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*
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* The table has a 1 wherever characters should be considered part of the
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* scanset.
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*
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* Return: pointer to the character past the closing `]'
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*/
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static const u_char *
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__sccl(char *tab, const u_char *fmt)
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{
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int c, n, v;
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/* first `clear' the whole table */
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c = *fmt++; /* first char hat => negated scanset */
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if (c == '^') {
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v = 1; /* default => accept */
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c = *fmt++; /* get new first char */
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} else {
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v = 0; /* default => reject */
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}
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/* XXX: Will not work if sizeof(tab*) > sizeof(char) */
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for (n = 0; n < 256; n++)
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tab[n] = v; /* memset(tab, v, 256) */
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if (c == 0)
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return (fmt - 1);/* format ended before closing ] */
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/*
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* Now set the entries corresponding to the actual scanset
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* to the opposite of the above.
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*
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* The first character may be ']' (or '-') without being special;
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* the last character may be '-'.
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*/
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v = 1 - v;
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for (;;) {
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tab[c] = v; /* take character c */
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doswitch:
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n = *fmt++; /* and examine the next */
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switch (n) {
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case 0: /* format ended too soon */
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return (fmt - 1);
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case '-':
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/*
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* A scanset of the form
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* [01+-]
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* is defined as `the digit 0, the digit 1,
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* the character +, the character -', but
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* the effect of a scanset such as
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* [a-zA-Z0-9]
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* is implementation defined. The V7 Unix
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* scanf treats `a-z' as `the letters a through
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* z', but treats `a-a' as `the letter a, the
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* character -, and the letter a'.
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*
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* For compatibility, the `-' is not considerd
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* to define a range if the character following
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* it is either a close bracket (required by ANSI)
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* or is not numerically greater than the character
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* we just stored in the table (c).
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*/
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n = *fmt;
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if (n == ']' || n < c) {
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c = '-';
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break; /* resume the for(;;) */
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}
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fmt++;
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/* fill in the range */
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do {
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tab[++c] = v;
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} while (c < n);
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c = n;
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/*
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* Alas, the V7 Unix scanf also treats formats
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* such as [a-c-e] as `the letters a through e'.
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* This too is permitted by the standard....
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*/
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goto doswitch;
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break;
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case ']': /* end of scanset */
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return (fmt);
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default: /* just another character */
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c = n;
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break;
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}
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}
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/* NOTREACHED */
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}
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/**
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* vsscanf - Unformat a buffer into a list of arguments
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* @buf: input buffer
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* @fmt: format of buffer
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* @args: arguments
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*/
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#define BUF 32 /* Maximum length of numeric string. */
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/*
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* Flags used during conversion.
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*/
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#define LONG 0x01 /* l: long or double */
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#define SHORT 0x04 /* h: short */
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#define SUPPRESS 0x08 /* suppress assignment */
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#define POINTER 0x10 /* weird %p pointer (`fake hex') */
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#define NOSKIP 0x20 /* do not skip blanks */
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#define QUAD 0x400
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#define SHORTSHORT 0x4000 /** hh: char */
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/*
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* The following are used in numeric conversions only:
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* SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
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* SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
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*/
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#define SIGNOK 0x40 /* +/- is (still) legal */
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#define NDIGITS 0x80 /* no digits detected */
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#define DPTOK 0x100 /* (float) decimal point is still legal */
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#define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */
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#define PFXOK 0x100 /* 0x prefix is (still) legal */
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#define NZDIGITS 0x200 /* no zero digits detected */
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/*
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* Conversion types.
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*/
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#define CT_CHAR 0 /* %c conversion */
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#define CT_CCL 1 /* %[...] conversion */
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#define CT_STRING 2 /* %s conversion */
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#define CT_INT 3 /* integer, i.e., strtoq or strtouq */
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typedef u64 (*ccfntype)(const char *, char **, int);
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int
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vsscanf(const char *inp, char const *fmt0, va_list ap)
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{
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int inr;
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const u_char *fmt = (const u_char *)fmt0;
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int c; /* character from format, or conversion */
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size_t width; /* field width, or 0 */
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char *p; /* points into all kinds of strings */
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int n; /* handy integer */
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int flags; /* flags as defined above */
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char *p0; /* saves original value of p when necessary */
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int nassigned; /* number of fields assigned */
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int nconversions; /* number of conversions */
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int nread; /* number of characters consumed from fp */
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int base; /* base argument to strtoq/strtouq */
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ccfntype ccfn; /* conversion function (strtoq/strtouq) */
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char ccltab[256]; /* character class table for %[...] */
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char buf[BUF]; /* buffer for numeric conversions */
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/* `basefix' is used to avoid `if' tests in the integer scanner */
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static short basefix[17] = { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
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12, 13, 14, 15, 16 };
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inr = strlen(inp);
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nassigned = 0;
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nconversions = 0;
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nread = 0;
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base = 0; /* XXX just to keep gcc happy */
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ccfn = NULL; /* XXX just to keep gcc happy */
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for (;;) {
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c = *fmt++;
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if (c == 0)
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return (nassigned);
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if (isspace(c)) {
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while (inr > 0 && isspace(*inp))
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nread++, inr--, inp++;
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continue;
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}
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if (c != '%')
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goto literal;
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width = 0;
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flags = 0;
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/*
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* switch on the format. continue if done;
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* break once format type is derived.
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*/
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again: c = *fmt++;
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switch (c) {
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case '%':
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literal:
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if (inr <= 0)
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goto input_failure;
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if (*inp != c)
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goto match_failure;
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inr--, inp++;
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nread++;
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continue;
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case '*':
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flags |= SUPPRESS;
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goto again;
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case 'l':
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if (flags & LONG) {
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flags &= ~LONG;
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flags |= QUAD;
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} else {
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flags |= LONG;
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}
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goto again;
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case 'q':
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flags |= QUAD;
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goto again;
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case 'h':
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if (flags & SHORT) {
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flags &= ~SHORT;
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flags |= SHORTSHORT;
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} else {
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flags |= SHORT;
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}
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goto again;
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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width = width * 10 + c - '0';
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goto again;
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/*
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* Conversions.
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*
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*/
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case 'd':
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c = CT_INT;
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ccfn = (ccfntype)strtoq;
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base = 10;
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break;
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case 'i':
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c = CT_INT;
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ccfn = (ccfntype)strtoq;
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base = 0;
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break;
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case 'o':
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c = CT_INT;
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ccfn = strtouq;
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base = 8;
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break;
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case 'u':
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c = CT_INT;
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ccfn = strtouq;
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base = 10;
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break;
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case 'x':
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flags |= PFXOK; /* enable 0x prefixing */
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c = CT_INT;
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ccfn = strtouq;
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base = 16;
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break;
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case 's':
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c = CT_STRING;
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break;
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case '[':
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fmt = __sccl(ccltab, fmt);
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flags |= NOSKIP;
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c = CT_CCL;
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break;
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case 'c':
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flags |= NOSKIP;
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c = CT_CHAR;
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break;
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case 'p': /* pointer format is like hex */
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flags |= POINTER | PFXOK;
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c = CT_INT;
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ccfn = strtouq;
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base = 16;
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break;
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case 'n':
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nconversions++;
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if (flags & SUPPRESS) /* ??? */
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continue;
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if (flags & SHORTSHORT)
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*va_arg(ap, char *) = nread;
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else if (flags & SHORT)
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*va_arg(ap, short *) = nread;
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else if (flags & LONG)
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*va_arg(ap, long *) = nread;
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else if (flags & QUAD)
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*va_arg(ap, s64 *) = nread;
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else
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*va_arg(ap, int *) = nread;
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continue;
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}
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/*
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* We have a conversion that requires input.
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*/
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if (inr <= 0)
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goto input_failure;
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/*
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* Consume leading white space, except for formats
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* that suppress this.
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*/
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if ((flags & NOSKIP) == 0) {
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while (isspace(*inp)) {
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nread++;
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if (--inr > 0)
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inp++;
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else
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goto input_failure;
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|
}
|
|
/*
|
|
* Note that there is at least one character in
|
|
* the buffer, so conversions that do not set NOSKIP
|
|
* can no longer result in an input failure.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* Do the conversion.
|
|
*/
|
|
switch (c) {
|
|
case CT_CHAR:
|
|
/* scan arbitrary characters (sets NOSKIP) */
|
|
if (width == 0)
|
|
width = 1;
|
|
if (flags & SUPPRESS) {
|
|
size_t sum = 0;
|
|
|
|
n = inr;
|
|
if (n < width) {
|
|
sum += n;
|
|
width -= n;
|
|
inp += n;
|
|
if (sum == 0)
|
|
goto input_failure;
|
|
} else {
|
|
sum += width;
|
|
inr -= width;
|
|
inp += width;
|
|
}
|
|
nread += sum;
|
|
} else {
|
|
memcpy(va_arg(ap, char *), inp, width);
|
|
inr -= width;
|
|
inp += width;
|
|
nread += width;
|
|
nassigned++;
|
|
}
|
|
nconversions++;
|
|
break;
|
|
|
|
case CT_CCL:
|
|
/* scan a (nonempty) character class (sets NOSKIP) */
|
|
if (width == 0)
|
|
width = (size_t)~0; /* `infinity' */
|
|
/* take only those things in the class */
|
|
if (flags & SUPPRESS) {
|
|
n = 0;
|
|
while (ccltab[(unsigned char)*inp]) {
|
|
n++, inr--, inp++;
|
|
if (--width == 0)
|
|
break;
|
|
if (inr <= 0) {
|
|
if (n == 0)
|
|
goto input_failure;
|
|
break;
|
|
}
|
|
}
|
|
if (n == 0)
|
|
goto match_failure;
|
|
} else {
|
|
p = va_arg(ap, char *);
|
|
p0 = p;
|
|
while (ccltab[(unsigned char)*inp]) {
|
|
inr--;
|
|
*p++ = *inp++;
|
|
if (--width == 0)
|
|
break;
|
|
if (inr <= 0) {
|
|
if (p == p0)
|
|
goto input_failure;
|
|
break;
|
|
}
|
|
}
|
|
n = p - p0;
|
|
if (n == 0)
|
|
goto match_failure;
|
|
*p = 0;
|
|
nassigned++;
|
|
}
|
|
nread += n;
|
|
nconversions++;
|
|
break;
|
|
|
|
case CT_STRING:
|
|
/* like CCL, but zero-length string OK, & no NOSKIP */
|
|
if (width == 0)
|
|
width = (size_t)~0;
|
|
if (flags & SUPPRESS) {
|
|
n = 0;
|
|
while (!isspace(*inp)) {
|
|
n++, inr--, inp++;
|
|
if (--width == 0)
|
|
break;
|
|
if (inr <= 0)
|
|
break;
|
|
}
|
|
nread += n;
|
|
} else {
|
|
p = va_arg(ap, char *);
|
|
p0 = p;
|
|
while (!isspace(*inp)) {
|
|
inr--;
|
|
*p++ = *inp++;
|
|
if (--width == 0)
|
|
break;
|
|
if (inr <= 0)
|
|
break;
|
|
}
|
|
*p = 0;
|
|
nread += p - p0;
|
|
nassigned++;
|
|
}
|
|
nconversions++;
|
|
continue;
|
|
|
|
case CT_INT:
|
|
/* scan an integer as if by strtoq/strtouq */
|
|
#ifdef hardway
|
|
if (width == 0 || width > sizeof(buf) - 1)
|
|
width = sizeof(buf) - 1;
|
|
#else
|
|
/* size_t is unsigned, hence this optimisation */
|
|
if (--width > sizeof(buf) - 2)
|
|
width = sizeof(buf) - 2;
|
|
width++;
|
|
#endif
|
|
flags |= SIGNOK | NDIGITS | NZDIGITS;
|
|
for (p = buf; width; width--) {
|
|
c = *inp;
|
|
/*
|
|
* Switch on the character; `goto ok'
|
|
* if we accept it as a part of number.
|
|
*/
|
|
switch (c) {
|
|
/*
|
|
* The digit 0 is always legal, but is
|
|
* special. For %i conversions, if no
|
|
* digits (zero or nonzero) have been
|
|
* scanned (only signs), we will have
|
|
* base==0. In that case, we should set
|
|
* it to 8 and enable 0x prefixing.
|
|
* Also, if we have not scanned zero digits
|
|
* before this, do not turn off prefixing
|
|
* (someone else will turn it off if we
|
|
* have scanned any nonzero digits).
|
|
*/
|
|
case '0':
|
|
if (base == 0) {
|
|
base = 8;
|
|
flags |= PFXOK;
|
|
}
|
|
if (flags & NZDIGITS)
|
|
flags &= ~(SIGNOK | NZDIGITS | NDIGITS);
|
|
else
|
|
flags &= ~(SIGNOK | PFXOK | NDIGITS);
|
|
goto ok;
|
|
|
|
/* 1 through 7 always legal */
|
|
case '1': case '2': case '3':
|
|
case '4': case '5': case '6': case '7':
|
|
base = basefix[base];
|
|
flags &= ~(SIGNOK | PFXOK | NDIGITS);
|
|
goto ok;
|
|
|
|
/* digits 8 and 9 ok iff decimal or hex */
|
|
case '8': case '9':
|
|
base = basefix[base];
|
|
if (base <= 8)
|
|
break; /* not legal here */
|
|
flags &= ~(SIGNOK | PFXOK | NDIGITS);
|
|
goto ok;
|
|
|
|
/* letters ok iff hex */
|
|
case 'A': case 'B': case 'C':
|
|
case 'D': case 'E': case 'F':
|
|
case 'a': case 'b': case 'c':
|
|
case 'd': case 'e': case 'f':
|
|
/* no need to fix base here */
|
|
if (base <= 10)
|
|
break; /* not legal here */
|
|
flags &= ~(SIGNOK | PFXOK | NDIGITS);
|
|
goto ok;
|
|
|
|
/* sign ok only as first character */
|
|
case '+': case '-':
|
|
if (flags & SIGNOK) {
|
|
flags &= ~SIGNOK;
|
|
goto ok;
|
|
}
|
|
break;
|
|
|
|
/* x ok iff flag still set & 2nd char */
|
|
case 'x': case 'X':
|
|
if (flags & PFXOK && p == buf + 1) {
|
|
base = 16; /* if %i */
|
|
flags &= ~PFXOK;
|
|
goto ok;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If we got here, c is not a legal character
|
|
* for a number. Stop accumulating digits.
|
|
*/
|
|
break;
|
|
ok:
|
|
/*
|
|
* c is legal: store it and look at the next.
|
|
*/
|
|
*p++ = c;
|
|
if (--inr > 0)
|
|
inp++;
|
|
else
|
|
break; /* end of input */
|
|
}
|
|
/*
|
|
* If we had only a sign, it is no good; push
|
|
* back the sign. If the number ends in `x',
|
|
* it was [sign] '' 'x', so push back the x
|
|
* and treat it as [sign] ''.
|
|
*/
|
|
if (flags & NDIGITS) {
|
|
if (p > buf) {
|
|
inp--;
|
|
inr++;
|
|
}
|
|
goto match_failure;
|
|
}
|
|
c = ((u_char *)p)[-1];
|
|
if (c == 'x' || c == 'X') {
|
|
--p;
|
|
inp--;
|
|
inr++;
|
|
}
|
|
if ((flags & SUPPRESS) == 0) {
|
|
u64 res;
|
|
|
|
*p = 0;
|
|
res = (*ccfn)(buf, (char **)NULL, base);
|
|
if (flags & POINTER)
|
|
*va_arg(ap, void **) =
|
|
(void *)(uintptr_t)res;
|
|
else if (flags & SHORTSHORT)
|
|
*va_arg(ap, char *) = res;
|
|
else if (flags & SHORT)
|
|
*va_arg(ap, short *) = res;
|
|
else if (flags & LONG)
|
|
*va_arg(ap, long *) = res;
|
|
else if (flags & QUAD)
|
|
*va_arg(ap, s64 *) = res;
|
|
else
|
|
*va_arg(ap, int *) = res;
|
|
nassigned++;
|
|
}
|
|
nread += p - buf;
|
|
nconversions++;
|
|
break;
|
|
}
|
|
}
|
|
input_failure:
|
|
return (nconversions != 0 ? nassigned : -1);
|
|
match_failure:
|
|
return (nassigned);
|
|
}
|
|
|
|
/**
|
|
* sscanf - Unformat a buffer into a list of arguments
|
|
* @buf: input buffer
|
|
* @fmt: formatting of buffer
|
|
* @...: resulting arguments
|
|
*/
|
|
int sscanf(const char *buf, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i;
|
|
|
|
va_start(args, fmt);
|
|
i = vsscanf(buf, fmt, args);
|
|
va_end(args);
|
|
return i;
|
|
}
|
|
|
|
#endif
|