ArduinoJson/srcs/Internals/EscapedString.cpp

/*
 * Arduino JSON library
 * Benoit Blanchon 2014 - MIT License
 */

#include "ArduinoJson/Internals/EscapedString.h"

using namespace ArduinoJson::Internals;

static inline char getSpecialChar(char c)
{
    // Optimized for code size on a 8-bit AVR

    const char* p = "\"\"\\\\\bb\ff\nn\rr\tt\0";

    while (p[0] && p[0] != c)
    {
        p += 2;
    }

    return p[1];
}

static inline size_t printCharTo(char c, Print* p)
{
    char specialChar = getSpecialChar(c);

    return specialChar != 0
        ? p->write('\\') + p->write(specialChar)
        : p->write(c);
}

size_t EscapedString::printTo(const char* s, Print* p)
{
    if (!s) return p->print("null");
    
    size_t n = p->write('\"');

    while (*s)
    {
        n += printCharTo(*s++, p);
    }

    return n + p->write('\"');
}