Function writeJsonValue

src/t_nhash.cpp:236–287

}

sds writeJsonValue(sds output, const char *valIn, size_t cchIn) {
    const char *val = valIn;
    size_t cch = cchIn;
    int cchEscapeExtra = 0;

    // First scan for escaped chars
    for (size_t ich = 0; ich < cchIn; ++ich) {
        if (FSimpleJsonEscapeCh(valIn[ich])) {
            ++cchEscapeExtra;
        } else if (FExtendedJsonEscapeCh(valIn[ich])) {
            cchEscapeExtra += 5;
        }
    }

    if (cchEscapeExtra > 0) {
        size_t ichDst = 0;
        sds dst = sdsnewlen(SDS_NOINIT, cchIn+cchEscapeExtra);
        for (size_t ich = 0; ich < cchIn; ++ich) {
            switch (valIn[ich]) {
                case '"':
                    dst[ichDst++] = '\\'; dst[ichDst++] = '"';
                    break;
                case '\\':
                    dst[ichDst++] = '\\'; dst[ichDst++] = '\\';
                    break;
                
                default:
                    serverAssert(!FSimpleJsonEscapeCh(valIn[ich]));
                    if (FExtendedJsonEscapeCh(valIn[ich])) {
                        dst[ichDst++] = '\\'; dst[ichDst++] = 'u';
                        snprintf(dst + ichDst, cchIn+cchEscapeExtra-ichDst, "%4x", valIn[ich]);
                        ichDst += 4;
                    } else {
                        dst[ichDst++] = valIn[ich];
                    }
                    break;
            }
        }
        val = (const char*)dst;
        serverAssert(ichDst == (cchIn+cchEscapeExtra));
        cch = ichDst;
    }

    output = sdscat(output, "\"");
    output = sdscatlen(output, val, cch);
    output = sdscat(output, "\"");

    if (val != valIn)
        sdsfree(val);

    return output;
}
sds writeJsonValue(sds output, sds val) {
    return writeJsonValue(output, (const char*)val, sdslen(val));
}