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/********************* */
/*! \file safe_print.cpp
** \verbatim
** Top contributors (to current version):
** Andres Noetzli, Andres Noetzli
** This file is part of the CVC4 project.
** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief Definition of print functions that are safe to use in a signal
** handler.
**
** Signal handlers only allow a very limited set of operations, e.g. dynamic
** memory allocation is not possible. This set of functions can be used to
** print information from a signal handler. All output is written to file
** descriptors using the async-signal-safe write() function.
**/
#include "safe_print.h"
#include <unistd.h>
/* Size of buffers used */
#define BUFFER_SIZE 20
namespace CVC4 {
template <>
void safe_print(int fd, const std::string& msg) {
// Print characters one by one instead of using
// string::data()/string::c_str() to avoid allocations (pre-c++11)
for (size_t i = 0; i < msg.length(); i++) {
if (write(fd, &(msg[i]), 1) != 1) {
abort();
}
}
}
template <>
void safe_print(int fd, const int64_t& _i) {
char buf[BUFFER_SIZE];
int64_t i = _i;
if (i == 0) {
safe_print(fd, "0");
return;
} else if (i < 0) {
safe_print(fd, "-");
i *= -1;
}
// This loop fills the buffer from the end. The number of elements in the
// buffer is BUFER_SIZE - idx - 1 and they start at position idx + 1.
ssize_t idx = BUFFER_SIZE - 1;
while (i != 0 && idx >= 0) {
buf[idx] = '0' + i % 10;
i /= 10;
idx--;
}
ssize_t nbyte = BUFFER_SIZE - idx - 1;
if (write(fd, buf + idx + 1, nbyte) != nbyte) {
abort();
}
}
template <>
void safe_print(int fd, const int32_t& i) {
safe_print<int64_t>(fd, i);
}
template <>
void safe_print(int fd, const uint64_t& _i) {
char buf[BUFFER_SIZE];
uint64_t i = _i;
if (i == 0) {
safe_print(fd, "0");
return;
}
// This loop fills the buffer from the end. The number of elements in the
// buffer is BUFER_SIZE - idx - 1 and they start at position idx + 1.
ssize_t idx = BUFFER_SIZE - 1;
while (i != 0 && idx >= 0) {
buf[idx] = '0' + i % 10;
i /= 10;
idx--;
}
ssize_t nbyte = BUFFER_SIZE - idx - 1;
if (write(fd, buf + idx + 1, nbyte) != nbyte) {
abort();
}
}
template <>
void safe_print(int fd, const uint32_t& i) {
safe_print<uint64_t>(fd, i);
}
template <>
void safe_print(int fd, const double& _d) {
// Note: this print function for floating-point values is optimized for
// simplicity, not correctness or performance.
char buf[BUFFER_SIZE];
double d = _d;
ssize_t i = 0;
int64_t v = static_cast<int64_t>(d);
d -= v;
if (d < 0.0) {
d *= -1.0;
}
safe_print<int64_t>(fd, v);
safe_print(fd, ".");
// Print decimal digits as long as the remaining value is larger than zero
// and print at least one digit.
while (i == 0 || (d > 0.0 && i < BUFFER_SIZE)) {
d *= 10.0;
char c = static_cast<char>(d);
buf[i] = '0' + c;
d -= c;
i++;
}
if (write(fd, buf, i) != i) {
abort();
}
}
template <>
void safe_print(int fd, const float& f) {
safe_print<double>(fd, (double)f);
}
template <>
void safe_print(int fd, const bool& b) {
if (b) {
safe_print(fd, "true");
} else {
safe_print(fd, "false");
}
}
template <>
void safe_print(int fd, void* const& addr) {
safe_print_hex(fd, (uint64_t)addr);
}
template <>
void safe_print(int fd, const timespec& t) {
safe_print<uint64_t>(fd, t.tv_sec);
safe_print(fd, ".");
safe_print_right_aligned(fd, t.tv_nsec, 9);
}
void safe_print_hex(int fd, uint64_t i) {
char buf[BUFFER_SIZE];
safe_print(fd, "0x");
if (i == 0) {
safe_print(fd, "0");
return;
}
// This loop fills the buffer from the end. The number of elements in the
// buffer is BUFER_SIZE - idx - 1 and they start at position idx + 1.
ssize_t idx = BUFFER_SIZE - 1;
while (i != 0 && idx >= 0) {
char current = i % 16;
if (current <= 9) {
buf[idx] = '0' + current;
} else {
buf[idx] = 'a' + current - 10;
}
i /= 16;
idx--;
}
ssize_t nbyte = BUFFER_SIZE - idx - 1;
if (write(fd, buf + idx + 1, nbyte) != nbyte) {
abort();
}
}
void safe_print_right_aligned(int fd, uint64_t i, ssize_t width) {
char buf[BUFFER_SIZE];
// Make sure that the result fits in the buffer
width = (width < BUFFER_SIZE) ? width : BUFFER_SIZE;
for (ssize_t j = 0; j < width; j++) {
buf[j] = '0';
}
ssize_t idx = width - 1;
while (i != 0 && idx >= 0) {
buf[idx] = '0' + i % 10;
i /= 10;
idx--;
}
if (write(fd, buf, width) != width) {
abort();
}
}
} /* CVC4 namespace */
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