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/*
* Copyright (C) 2017 The Android Open Source Project
* All rights reserved.
*
* 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.
*/
#ifndef _STDIO_H_
#error "Never include this file directly; instead, include <stdio.h>"
#endif
char* __fgets_chk(char*, int, FILE*, size_t) __INTRODUCED_IN(17);
size_t __fread_chk(void*, size_t, size_t, FILE*, size_t) __INTRODUCED_IN(24);
size_t __fwrite_chk(const void*, size_t, size_t, FILE*, size_t) __INTRODUCED_IN(24);
#if defined(__BIONIC_FORTIFY) && !defined(__BIONIC_NO_STDIO_FORTIFY)
#if __ANDROID_API__ >= 17 && __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
/* No diag -- clang diagnoses misuses of this on its own. */
__BIONIC_FORTIFY_INLINE __printflike(3, 0)
int vsnprintf(char* const __pass_object_size dest, size_t size, const char* format, va_list ap)
__overloadable {
return __builtin___vsnprintf_chk(dest, size, 0, __bos(dest), format, ap);
}
__BIONIC_FORTIFY_INLINE __printflike(2, 0)
int vsprintf(char* const __pass_object_size dest, const char* format, va_list ap) __overloadable {
return __builtin___vsprintf_chk(dest, 0, __bos(dest), format, ap);
}
#endif
__BIONIC_ERROR_FUNCTION_VISIBILITY
int sprintf(char* dest, const char* format)
__overloadable
__enable_if(__bos_unevaluated_lt(__bos(dest), __builtin_strlen(format)),
"format string will always overflow destination buffer")
__errorattr("format string will always overflow destination buffer");
#if __ANDROID_API__ >= 17 && __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
__BIONIC_FORTIFY_VARIADIC __printflike(2, 3)
int sprintf(char* const __pass_object_size dest, const char* format, ...) __overloadable {
va_list va;
va_start(va, format);
int result = __builtin___vsprintf_chk(dest, 0, __bos(dest), format, va);
va_end(va);
return result;
}
/* No diag -- clang diagnoses misuses of this on its own. */
__BIONIC_FORTIFY_VARIADIC __printflike(3, 4)
int snprintf(char* const __pass_object_size dest, size_t size, const char* format, ...)
__overloadable {
va_list va;
va_start(va, format);
int result = __builtin___vsnprintf_chk(dest, size, 0, __bos(dest), format, va);
va_end(va);
return result;
}
#endif
#define __bos_trivially_ge_mul(bos_val, size, count) \
__bos_dynamic_check_impl_and(bos_val, >=, (size) * (count), \
!__unsafe_check_mul_overflow(size, count))
__BIONIC_FORTIFY_INLINE
size_t fread(void* const __pass_object_size0 buf, size_t size, size_t count, FILE* stream)
__overloadable
__clang_error_if(__unsafe_check_mul_overflow(size, count),
"in call to 'fread', size * count overflows")
__clang_error_if(__bos_unevaluated_lt(__bos0(buf), size * count),
"in call to 'fread', size * count is too large for the given buffer") {
#if __ANDROID_API__ >= 24 && __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
size_t bos = __bos0(buf);
if (!__bos_trivially_ge_mul(bos, size, count)) {
return __fread_chk(buf, size, count, stream, bos);
}
#endif
return __call_bypassing_fortify(fread)(buf, size, count, stream);
}
__BIONIC_FORTIFY_INLINE
size_t fwrite(const void* const __pass_object_size0 buf, size_t size, size_t count, FILE* stream)
__overloadable
__clang_error_if(__unsafe_check_mul_overflow(size, count),
"in call to 'fwrite', size * count overflows")
__clang_error_if(__bos_unevaluated_lt(__bos0(buf), size * count),
"in call to 'fwrite', size * count is too large for the given buffer") {
#if __ANDROID_API__ >= 24 && __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
size_t bos = __bos0(buf);
if (!__bos_trivially_ge_mul(bos, size, count)) {
return __fwrite_chk(buf, size, count, stream, bos);
}
#endif
return __call_bypassing_fortify(fwrite)(buf, size, count, stream);
}
#undef __bos_trivially_ge_mul
__BIONIC_FORTIFY_INLINE
char* fgets(char* const __pass_object_size dest, int size, FILE* stream)
__overloadable
__clang_error_if(size < 0, "in call to 'fgets', size should not be negative")
__clang_error_if(__bos_unevaluated_lt(__bos(dest), size),
"in call to 'fgets', size is larger than the destination buffer") {
#if __ANDROID_API__ >= 17 && __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
size_t bos = __bos(dest);
if (!__bos_dynamic_check_impl_and(bos, >=, (size_t)size, size >= 0)) {
return __fgets_chk(dest, size, stream, bos);
}
#endif
return __call_bypassing_fortify(fgets)(dest, size, stream);
}
#endif /* defined(__BIONIC_FORTIFY) */
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