gen.cpp

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// Copyright 2014 BitPay Inc.
// Distributed under the MIT software license, see the accompanying
// file COPYING or https://opensource.org/licenses/mit-license.php.
 
//
// To re-create univalue_escapes.h:
// $ g++ -o gen gen.cpp
// $ ./gen > univalue_escapes.h
//
 
#include <stdio.h>
#include <string.h>
#include "univalue.h"
 
static bool initEscapes;
static std::string escapes[256];
 
static void initJsonEscape()
{
    // Escape all lower control characters (some get overridden with smaller sequences below)
    for (int ch=0x00; ch<0x20; ++ch) {
        char tmpbuf[20];
        snprintf(tmpbuf, sizeof(tmpbuf), "\\u%04x", ch);
        escapes[ch] = std::string(tmpbuf);
    }
 
    escapes[(int)'"'] = "\\\"";
    escapes[(int)'\\'] = "\\\\";
    escapes[(int)'\b'] = "\\b";
    escapes[(int)'\f'] = "\\f";
    escapes[(int)'\n'] = "\\n";
    escapes[(int)'\r'] = "\\r";
    escapes[(int)'\t'] = "\\t";
    escapes[(int)'\x7f'] = "\\u007f"; // U+007F DELETE
 
    initEscapes = true;
}
 
static void outputEscape()
{
        printf( "// Automatically generated file. Do not modify.\n"
                "#ifndef BITCOIN_UNIVALUE_UNIVALUE_ESCAPES_H\n"
                "#define BITCOIN_UNIVALUE_UNIVALUE_ESCAPES_H\n"
                "static const char *escapes[256] = {\n");
 
        for (unsigned int i = 0; i < 256; i++) {
                if (escapes[i].empty()) {
                        printf("\tnullptr,\n");
                } else {
                        printf("\t\"");
 
                        unsigned int si;
                        for (si = 0; si < escapes[i].size(); si++) {
                                char ch = escapes[i][si];
                                switch (ch) {
                                case '"':
                                        printf("\\\"");
                                        break;
                                case '\\':
                                        printf("\\\\");
                                        break;
                                default:
                                        printf("%c", escapes[i][si]);
                                        break;
                                }
                        }
 
                        printf("\",\n");
                }
        }
 
        printf( "};\n"
                "#endif // BITCOIN_UNIVALUE_UNIVALUE_ESCAPES_H\n");
}
 
int main (int argc, char *argv[])
{
        initJsonEscape();
        outputEscape();
        return 0;
}