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🔨 refactored code to avoid using strcpy/strlen/strcat (#463)

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This commit is contained in:
Niels Lohmann 2017-02-20 17:37:34 +01:00
parent 716485a965
commit 83a9c60dbd
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GPG Key ID: 7F3CEA63AE251B69
2 changed files with 74 additions and 22 deletions
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48
src/json.hpp
View File

@ -38,7 +38,7 @@ SOFTWARE.
#include <cstddef> // nullptr_t, ptrdiff_t, size_t
#include <cstdint> // int64_t, uint64_t
#include <cstdlib> // abort, strtod, strtof, strtold, strtoul, strtoll, strtoull
#include <cstring> // strcpy, strlen
#include <cstring> // strlen
#include <forward_list> // forward_list
#include <functional> // function, hash, less
#include <initializer_list> // initializer_list
@ -8259,6 +8259,7 @@ class basic_json
template<typename NumberType>
void x_write(NumberType x, /*is_integral=*/std::true_type)
{
// special case for "0"
if (x == 0)
{
m_buf[0] = '0';
@ -8291,9 +8292,17 @@ class basic_json
template<typename NumberType>
void x_write(NumberType x, /*is_integral=*/std::false_type)
{
// special case for 0.0 and -0.0
if (x == 0)
{
std::strcpy(m_buf.data(), std::signbit(x) ? "-0.0" : "0.0");
size_t i = 0;
if (std::signbit(x))
{
m_buf[i++] = '-';
}
m_buf[i++] = '0';
m_buf[i++] = '.';
m_buf[i] = '0';
return;
}
@ -8342,18 +8351,35 @@ class basic_json
}
// determine if need to append ".0"
const auto data_end = m_buf.begin() + strlen(m_buf.data());
const bool value_is_int_like =
std::none_of(m_buf.begin(), data_end, [](const char c)
size_t i = 0;
bool value_is_int_like = true;
for (i = 0; i < m_buf.size(); ++i)
{
return (c == '.' or c == 'e' or c == 'E');
});
assert(data_end + 2 < m_buf.end());
// break when end of number is reached
if (m_buf[i] == '\0')
{
break;
}
// check if we find non-int character
value_is_int_like = value_is_int_like and m_buf[i] != '.' and
m_buf[i] != 'e' and m_buf[i] != 'E';
}
if (value_is_int_like)
{
strcat(m_buf.data(), ".0");
// there must be 2 bytes left for ".0"
assert((i + 2) < m_buf.size());
// we write to the end of the number
assert(m_buf[i] == '\0');
assert(m_buf[i - 1] != '\0');
// add ".0"
m_buf[i] = '.';
m_buf[i + 1] = '0';
// the resulting string is properly terminated
assert(m_buf[i + 2] == '\0');
}
}
};
@ -11136,7 +11162,7 @@ basic_json_parser_74:
// update data to point to the modified bytes
if ((len + 1) < buf.size())
{
std::copy(m_start, m_end, buf.data());
std::copy(m_start, m_end, buf.begin());
buf[len] = 0;
buf[ds_pos] = decimal_point_char;
data = buf.data();

48
src/json.hpp.re2c
View File

@ -38,7 +38,7 @@ SOFTWARE.
#include <cstddef> // nullptr_t, ptrdiff_t, size_t
#include <cstdint> // int64_t, uint64_t
#include <cstdlib> // abort, strtod, strtof, strtold, strtoul, strtoll, strtoull
#include <cstring> // strcpy, strlen
#include <cstring> // strlen
#include <forward_list> // forward_list
#include <functional> // function, hash, less
#include <initializer_list> // initializer_list
@ -8259,6 +8259,7 @@ class basic_json
template<typename NumberType>
void x_write(NumberType x, /*is_integral=*/std::true_type)
{
// special case for "0"
if (x == 0)
{
m_buf[0] = '0';
@ -8291,9 +8292,17 @@ class basic_json
template<typename NumberType>
void x_write(NumberType x, /*is_integral=*/std::false_type)
{
// special case for 0.0 and -0.0
if (x == 0)
{
std::strcpy(m_buf.data(), std::signbit(x) ? "-0.0" : "0.0");
size_t i = 0;
if (std::signbit(x))
{
m_buf[i++] = '-';
}
m_buf[i++] = '0';
m_buf[i++] = '.';
m_buf[i] = '0';
return;
}
@ -8342,18 +8351,35 @@ class basic_json
}
// determine if need to append ".0"
const auto data_end = m_buf.begin() + strlen(m_buf.data());
const bool value_is_int_like =
std::none_of(m_buf.begin(), data_end, [](const char c)
size_t i = 0;
bool value_is_int_like = true;
for (i = 0; i < m_buf.size(); ++i)
{
return (c == '.' or c == 'e' or c == 'E');
});
assert(data_end + 2 < m_buf.end());
// break when end of number is reached
if (m_buf[i] == '\0')
{
break;
}
// check if we find non-int character
value_is_int_like = value_is_int_like and m_buf[i] != '.' and
m_buf[i] != 'e' and m_buf[i] != 'E';
}
if (value_is_int_like)
{
strcat(m_buf.data(), ".0");
// there must be 2 bytes left for ".0"
assert((i + 2) < m_buf.size());
// we write to the end of the number
assert(m_buf[i] == '\0');
assert(m_buf[i - 1] != '\0');
// add ".0"
m_buf[i] = '.';
m_buf[i + 1] = '0';
// the resulting string is properly terminated
assert(m_buf[i + 2] == '\0');
}
}
};
@ -10170,7 +10196,7 @@ class basic_json
// update data to point to the modified bytes
if ((len + 1) < buf.size())
{
std::copy(m_start, m_end, buf.data());
std::copy(m_start, m_end, buf.begin());
buf[len] = 0;
buf[ds_pos] = decimal_point_char;
data = buf.data();