ss/include/sized_string.h

#ifndef SIZED_STRING_H
#define SIZED_STRING_H

#include <MSL_C/string.h>

/**
 * A statically sized string buffer used for resource
 * identification where strings are guaranteed to be short.
 * 
 * Note: We aren't aware of any other projects that use a similar
 * class and given that SS has no debugging info anywhere it's hard
 * to be certain about anything.
 */
template <size_t Size>
struct SizedString {
    SizedString() {
        mChars[0] = '\0';
    }

    SizedString(const char *src) {
        operator=(src);
    }

    char mChars[Size];

    char *operator&() {
        return mChars;
    }

    const char *operator&() const {
        return mChars;
    }

    void operator=(const char *src) {
        if (src != mChars) {
            mChars[0] = '\0';
            operator+=(src);
        }
    }

    void operator+=(const char *src) {
        if (src != nullptr) {
            size_t destLen = strlen(mChars);
            size_t copyLen = strlen(src);

            // Make sure copy length isnt more than destination length
            if (destLen + copyLen + 1 >= Size) {
                size_t tmpLen = Size - destLen;
                copyLen = tmpLen - 1;
            }

            strncpy(mChars + destLen, src, copyLen);

            // make sure string is null terminated
            size_t offset = destLen + copyLen;
            mChars[offset] = '\0';
        }
    }

    int sprintf(const char *fmt, ...) {
        va_list args;
        va_start(args, fmt);

        int printed = vsnprintf(this->mChars, Size, fmt, args);
        if (printed != strlen(this->mChars)) {
            this->mChars[0] = '\0';
        }
        va_end(list);
        return printed;
    }
};

#endif