de5a5fa139
From-SVN: r202113
220 lines
6.8 KiB
C++
220 lines
6.8 KiB
C++
//===-- sanitizer_printf.cc -----------------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is shared between AddressSanitizer and ThreadSanitizer.
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//
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// Internal printf function, used inside run-time libraries.
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// We can't use libc printf because we intercept some of the functions used
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// inside it.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common.h"
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#include "sanitizer_libc.h"
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#include <stdio.h>
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#include <stdarg.h>
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namespace __sanitizer {
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StaticSpinMutex CommonSanitizerReportMutex;
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static int AppendChar(char **buff, const char *buff_end, char c) {
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if (*buff < buff_end) {
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**buff = c;
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(*buff)++;
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}
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return 1;
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}
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// Appends number in a given base to buffer. If its length is less than
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// "minimal_num_length", it is padded with leading zeroes.
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static int AppendUnsigned(char **buff, const char *buff_end, u64 num,
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u8 base, u8 minimal_num_length) {
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uptr const kMaxLen = 30;
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RAW_CHECK(base == 10 || base == 16);
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RAW_CHECK(minimal_num_length < kMaxLen);
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uptr num_buffer[kMaxLen];
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uptr pos = 0;
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do {
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RAW_CHECK_MSG(pos < kMaxLen, "appendNumber buffer overflow");
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num_buffer[pos++] = num % base;
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num /= base;
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} while (num > 0);
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if (pos < minimal_num_length) {
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// Make sure compiler doesn't insert call to memset here.
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internal_memset(&num_buffer[pos], 0,
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sizeof(num_buffer[0]) * (minimal_num_length - pos));
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pos = minimal_num_length;
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}
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int result = 0;
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while (pos-- > 0) {
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uptr digit = num_buffer[pos];
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result += AppendChar(buff, buff_end, (digit < 10) ? '0' + digit
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: 'a' + digit - 10);
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}
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return result;
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}
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static int AppendSignedDecimal(char **buff, const char *buff_end, s64 num,
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u8 minimal_num_length) {
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int result = 0;
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if (num < 0) {
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result += AppendChar(buff, buff_end, '-');
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num = -num;
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if (minimal_num_length)
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--minimal_num_length;
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}
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result += AppendUnsigned(buff, buff_end, (u64)num, 10, minimal_num_length);
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return result;
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}
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static int AppendString(char **buff, const char *buff_end, const char *s) {
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if (s == 0)
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s = "<null>";
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int result = 0;
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for (; *s; s++) {
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result += AppendChar(buff, buff_end, *s);
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}
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return result;
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}
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static int AppendPointer(char **buff, const char *buff_end, u64 ptr_value) {
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int result = 0;
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result += AppendString(buff, buff_end, "0x");
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result += AppendUnsigned(buff, buff_end, ptr_value, 16,
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(SANITIZER_WORDSIZE == 64) ? 12 : 8);
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return result;
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}
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int VSNPrintf(char *buff, int buff_length,
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const char *format, va_list args) {
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static const char *kPrintfFormatsHelp =
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"Supported Printf formats: %(0[0-9]*)?(z|ll)?{d,u,x}; %p; %s; %c\n";
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RAW_CHECK(format);
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RAW_CHECK(buff_length > 0);
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const char *buff_end = &buff[buff_length - 1];
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const char *cur = format;
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int result = 0;
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for (; *cur; cur++) {
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if (*cur != '%') {
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result += AppendChar(&buff, buff_end, *cur);
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continue;
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}
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cur++;
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bool have_width = (*cur == '0');
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int width = 0;
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if (have_width) {
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while (*cur >= '0' && *cur <= '9') {
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have_width = true;
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width = width * 10 + *cur++ - '0';
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}
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}
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bool have_z = (*cur == 'z');
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cur += have_z;
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bool have_ll = !have_z && (cur[0] == 'l' && cur[1] == 'l');
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cur += have_ll * 2;
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s64 dval;
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u64 uval;
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bool have_flags = have_width | have_z | have_ll;
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switch (*cur) {
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case 'd': {
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dval = have_ll ? va_arg(args, s64)
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: have_z ? va_arg(args, sptr)
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: va_arg(args, int);
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result += AppendSignedDecimal(&buff, buff_end, dval, width);
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break;
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}
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case 'u':
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case 'x': {
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uval = have_ll ? va_arg(args, u64)
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: have_z ? va_arg(args, uptr)
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: va_arg(args, unsigned);
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result += AppendUnsigned(&buff, buff_end, uval,
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(*cur == 'u') ? 10 : 16, width);
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break;
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}
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case 'p': {
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RAW_CHECK_MSG(!have_flags, kPrintfFormatsHelp);
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result += AppendPointer(&buff, buff_end, va_arg(args, uptr));
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break;
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}
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case 's': {
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RAW_CHECK_MSG(!have_flags, kPrintfFormatsHelp);
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result += AppendString(&buff, buff_end, va_arg(args, char*));
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break;
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}
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case 'c': {
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RAW_CHECK_MSG(!have_flags, kPrintfFormatsHelp);
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result += AppendChar(&buff, buff_end, va_arg(args, int));
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break;
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}
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case '%' : {
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RAW_CHECK_MSG(!have_flags, kPrintfFormatsHelp);
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result += AppendChar(&buff, buff_end, '%');
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break;
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}
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default: {
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RAW_CHECK_MSG(false, kPrintfFormatsHelp);
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}
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}
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}
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RAW_CHECK(buff <= buff_end);
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AppendChar(&buff, buff_end + 1, '\0');
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return result;
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}
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static void (*PrintfAndReportCallback)(const char *);
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void SetPrintfAndReportCallback(void (*callback)(const char *)) {
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PrintfAndReportCallback = callback;
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}
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void Printf(const char *format, ...) {
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const int kLen = 16 * 1024;
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InternalScopedBuffer<char> buffer(kLen);
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va_list args;
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va_start(args, format);
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int needed_length = VSNPrintf(buffer.data(), kLen, format, args);
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va_end(args);
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RAW_CHECK_MSG(needed_length < kLen, "Buffer in Printf is too short!\n");
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RawWrite(buffer.data());
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if (PrintfAndReportCallback)
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PrintfAndReportCallback(buffer.data());
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}
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// Writes at most "length" symbols to "buffer" (including trailing '\0').
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// Returns the number of symbols that should have been written to buffer
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// (not including trailing '\0'). Thus, the string is truncated
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// iff return value is not less than "length".
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int internal_snprintf(char *buffer, uptr length, const char *format, ...) {
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va_list args;
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va_start(args, format);
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int needed_length = VSNPrintf(buffer, length, format, args);
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va_end(args);
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return needed_length;
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}
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// Like Printf, but prints the current PID before the output string.
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void Report(const char *format, ...) {
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const int kLen = 16 * 1024;
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InternalScopedBuffer<char> buffer(kLen);
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int needed_length = internal_snprintf(buffer.data(),
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kLen, "==%d== ", GetPid());
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RAW_CHECK_MSG(needed_length < kLen, "Buffer in Report is too short!\n");
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va_list args;
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va_start(args, format);
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needed_length += VSNPrintf(buffer.data() + needed_length,
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kLen - needed_length, format, args);
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va_end(args);
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RAW_CHECK_MSG(needed_length < kLen, "Buffer in Report is too short!\n");
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RawWrite(buffer.data());
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if (PrintfAndReportCallback)
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PrintfAndReportCallback(buffer.data());
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}
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} // namespace __sanitizer
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