| /* $OpenBSD: vfscanf.c,v 1.31 2014/03/19 05:17:01 guenther Exp $ */ |
| /*- |
| * Copyright (c) 1990, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * This code is derived from software contributed to Berkeley by |
| * Chris Torek. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * 3. Neither the name of the University 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 REGENTS 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 REGENTS 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. |
| */ |
| |
| #include <ctype.h> |
| #include <inttypes.h> |
| #include <limits.h> |
| #include <locale.h> |
| #include <stdarg.h> |
| #include <stddef.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/param.h> |
| #include <wctype.h> |
| #include "local.h" |
| |
| #include <platform/bionic/macros.h> |
| #include <private/bionic_fortify.h> |
| #include <private/bionic_mbstate.h> |
| |
| #define BUF 513 /* Maximum length of numeric string. */ |
| |
| // Flags used during conversion. |
| // Size/type: |
| #define LONG 0x00001 // l: long or double |
| #define LONGDBL 0x00002 // L: long double |
| #define SHORT 0x00004 // h: short |
| #define SHORTSHORT 0x00008 // hh: 8 bit integer |
| #define LLONG 0x00010 // ll: long long (+ deprecated q: quad) |
| #define POINTER 0x00020 // p: void* (as hex) |
| #define SIZEINT 0x00040 // z: (signed) size_t |
| #define MAXINT 0x00080 // j: intmax_t |
| #define PTRINT 0x00100 // t: ptrdiff_t |
| #define NOSKIP 0x00200 // [ or c: do not skip blanks |
| // Modifiers: |
| #define SUPPRESS 0x00400 // *: suppress assignment |
| #define UNSIGNED 0x00800 // %[oupxX] conversions |
| #define ALLOCATE 0x01000 // m: allocate a char* |
| // Internal use during integer parsing: |
| #define SIGNOK 0x02000 // +/- is (still) legal |
| #define HAVESIGN 0x04000 // Sign detected |
| #define NDIGITS 0x08000 // No digits detected |
| #define PFXOK 0x10000 // "0x" prefix is (still) legal |
| #define PFBOK 0x20000 // "0b" prefix is (still) legal |
| #define NZDIGITS 0x40000 // No zero digits detected |
| |
| // Conversion types. |
| #define CT_CHAR 0 // %c conversion |
| #define CT_CCL 1 // %[...] conversion |
| #define CT_STRING 2 // %s conversion |
| #define CT_INT 3 // Integer: strtoimax/strtoumax |
| #define CT_FLOAT 4 // Float: strtod |
| |
| #define to_digit(c) static_cast<int>((c) - '0') |
| #define is_digit(c) (static_cast<unsigned>(to_digit(c)) <= 9) |
| |
| // Append a digit to a value and check for overflow. |
| #define APPEND_DIGIT(val, dig) \ |
| do { \ |
| if ((val) > INT_MAX / 10) \ |
| errno = ENOMEM; \ |
| else { \ |
| (val) *= 10; \ |
| if ((val) > INT_MAX - to_digit((dig))) \ |
| errno = ENOMEM; \ |
| else \ |
| (val) += to_digit((dig)); \ |
| } \ |
| } while (0) |
| |
| #pragma clang diagnostic push |
| #pragma clang diagnostic ignored "-Wunused-function" |
| // Trasnlate a fixed size integer argument for the %w/%wf format to a |
| // flag representation. Supported sizes are 8, 16, 32, and 64 so far. |
| // See details in bionic/libc/include/stdint.h |
| static int w_to_flag(int size, bool fast) { |
| static constexpr int fast_size = sizeof(void*) == 8 ? LLONG : 0; |
| if (size == 8) return SHORTSHORT; |
| if (size == 16) return fast ? fast_size : SHORT; |
| if (size == 32) return fast ? fast_size : 0; |
| if (size == 64) return LLONG; |
| __fortify_fatal("%%w%s%d is unsupported", fast ? "f" : "", size); |
| } |
| |
| #pragma clang diagnostic pop |