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//===-- tsan_printf.cc ----------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_libc.h"
#include "tsan_defs.h"
#include "tsan_mman.h"
#include "tsan_platform.h"
#include <stdarg.h> // va_list
typedef long long i64; // NOLINT
typedef long iptr; // NOLINT
namespace __tsan {
static int AppendChar(char **buff, const char *buff_end, char c) {
if (*buff < buff_end) {
**buff = c;
(*buff)++;
}
return 1;
}
static int AppendUnsigned(char **buff, const char *buff_end, u64 num,
int base, uptr minimal_num_length) {
uptr const kMaxLen = 30;
uptr num_buffer[kMaxLen];
uptr pos = 0;
do {
num_buffer[pos++] = num % base;
num /= base;
} while (num > 0);
while (pos < minimal_num_length) num_buffer[pos++] = 0;
int result = 0;
while (pos-- > 0) {
uptr digit = num_buffer[pos];
result += AppendChar(buff, buff_end, (digit < 10) ? '0' + digit
: 'a' + digit - 10);
}
return result;
}
static int AppendSignedDecimal(char **buff, const char *buff_end, i64 num) {
int result = 0;
if (num < 0) {
result += AppendChar(buff, buff_end, '-');
num = -num;
}
result += AppendUnsigned(buff, buff_end, (u64)num, 10, 0);
return result;
}
static int AppendString(char **buff, const char *buff_end, const char *s) {
if (s == 0)
s = "<null>";
int result = 0;
for (; *s; s++) {
result += AppendChar(buff, buff_end, *s);
}
return result;
}
static int AppendPointer(char **buff, const char *buff_end, u64 ptr_value) {
int result = 0;
result += AppendString(buff, buff_end, "0x");
result += AppendUnsigned(buff, buff_end, ptr_value, 16,
(sizeof(void*) == 8) ? 12 : 8); // NOLINT
return result;
}
static uptr VSNPrintf(char *buff, int buff_length,
const char *format, va_list args) {
const char *buff_end = &buff[buff_length - 1];
const char *cur = format;
int result = 0;
for (; *cur; cur++) {
if (*cur != '%') {
result += AppendChar(&buff, buff_end, *cur);
continue;
}
cur++;
bool is_long = (*cur == 'l');
cur += is_long;
bool is_llong = (*cur == 'l');
cur += is_llong;
switch (*cur) {
case 'd': {
i64 v = is_llong ? va_arg(args, i64)
: is_long ? va_arg(args, iptr)
: va_arg(args, int);
result += AppendSignedDecimal(&buff, buff_end, v);
break;
}
case 'u':
case 'x': {
u64 v = is_llong ? va_arg(args, u64)
: is_long ? va_arg(args, uptr)
: va_arg(args, unsigned);
result += AppendUnsigned(&buff, buff_end, v, *cur == 'u' ? 10: 16, 0);
break;
}
case 'p': {
result += AppendPointer(&buff, buff_end, va_arg(args, uptr));
break;
}
case 's': {
result += AppendString(&buff, buff_end, va_arg(args, char*));
break;
}
default: {
Die();
}
}
}
AppendChar(&buff, buff_end + 1, '\0');
return result;
}
void Printf(const char *format, ...) {
ScopedInRtl in_rtl;
const uptr kMaxLen = 16 * 1024;
InternalScopedBuf<char> buffer(kMaxLen);
va_list args;
va_start(args, format);
uptr len = VSNPrintf(buffer, buffer.Size(), format, args);
va_end(args);
internal_write(CTX() ? flags()->log_fileno : 2,
buffer, len < buffer.Size() ? len : buffer.Size() - 1);
}
uptr Snprintf(char *buffer, uptr length, const char *format, ...) {
va_list args;
va_start(args, format);
uptr len = VSNPrintf(buffer, length, format, args);
va_end(args);
return len;
}
}
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