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