stdio.c

这是在linux下gnu环境中进行norflash测试的代码

        }
    }

    // Write current digit
    if ((value & 0xF) < 10) {

        PutChar(pStr, (value & 0xF) + '0');
    }
    else if (maj) {

        PutChar(pStr, (value & 0xF) - 10 + 'A');
    }
    else {

        PutChar(pStr, (value & 0xF) - 10 + 'a');
    }
    num++;

    return num;
}

//------------------------------------------------------------------------------
//         Global Functions
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
/// Stores the result of a formatted string into another string. Format
/// arguments are given in a va_list instance.
/// Return the number of characters written.
/// \param pStr    Destination string.
/// \param length  Length of Destination string.
/// \param pFormat Format string.
/// \param ap      Argument list.
//------------------------------------------------------------------------------
signed int vsnprintf(char *pStr, size_t length, const char *pFormat, va_list ap)
{
    char          fill;
    unsigned char width;
    signed int    num = 0;
    signed int    size = 0;

    // Clear the string
    if (pStr) {

        *pStr = 0;
    }

    // Phase string
    while (*pFormat != 0 && size < length) {

        // Normal character
        if (*pFormat != '%') {

            *pStr++ = *pFormat++;
            size++;
        }
        // Escaped '%'
        else if (*(pFormat+1) == '%') {

            *pStr++ = '%';
            pFormat += 2;
            size++;
        }
        // Token delimiter
        else {

            fill = ' ';
            width = 0;
            pFormat++;

            // Parse filler
            if (*pFormat == '0') {

                fill = '0';
                pFormat++;
            }

            // Parse width
            while ((*pFormat >= '0') && (*pFormat <= '9')) {
        
                width = (width*10) + *pFormat-'0';
                pFormat++;
            }

            // Check if there is enough space
            if (size + width > length) {

                width = length - size;
            }
        
            // Parse type
            switch (*pFormat) {
            case 'd': 
            case 'i': num = PutSignedInt(pStr, fill, width, va_arg(ap, signed int)); break;
            case 'u': num = PutUnsignedInt(pStr, fill, width, va_arg(ap, unsigned int)); break;
            case 'x': num = PutHexa(pStr, fill, width, 0, va_arg(ap, unsigned int)); break;
            case 'X': num = PutHexa(pStr, fill, width, 1, va_arg(ap, unsigned int)); break;
            case 's': num = PutString(pStr, va_arg(ap, char *)); break;
            case 'c': num = PutChar(pStr, va_arg(ap, unsigned int)); break;
            default:
                return EOF;
            }

            pFormat++;
            pStr += num;
            size += num;
        }
    }

    // NULL-terminated (final \0 is not counted)
    if (size < length) {

        *pStr = 0;
    }
    else {

        *(--pStr) = 0;
        size--;
    }

    return size;
}

//------------------------------------------------------------------------------
/// Stores the result of a formatted string into another string. Format
/// arguments are given in a va_list instance.
/// Return the number of characters written.
/// \param pString Destination string.
/// \param length  Length of Destination string.
/// \param pFormat Format string.
/// \param ...     Other arguments
//------------------------------------------------------------------------------
signed int snprintf(char *pString, size_t length, const char *pFormat, ...)
{
    va_list    ap;
    signed int rc;

    va_start(ap, pFormat);
    rc = vsnprintf(pString, length, pFormat, ap);
    va_end(ap);

    return rc;
}

//------------------------------------------------------------------------------
/// Stores the result of a formatted string into another string. Format
/// arguments are given in a va_list instance.
/// Return the number of characters written.
/// \param pString  Destination string.
/// \param pFormat  Format string.
/// \param ap       Argument list.
//------------------------------------------------------------------------------
signed int vsprintf(char *pString, const char *pFormat, va_list ap)
{
    return vsnprintf(pString, MAX_STRING_SIZE, pFormat, ap);
}

//------------------------------------------------------------------------------
/// Outputs a formatted string on the given stream. Format arguments are given
/// in a va_list instance.
/// \param pStream  Output stream.
/// \param pFormat  Format string
/// \param ap  Argument list.
//------------------------------------------------------------------------------
signed int vfprintf(FILE *pStream, const char *pFormat, va_list ap)
{
    char pStr[MAX_STRING_SIZE];
    char pError[] = "stdio.c: increase MAX_STRING_SIZE\n\r";

    // Write formatted string in buffer
    if (vsprintf(pStr, pFormat, ap) >= MAX_STRING_SIZE) {

        fputs(pError, stderr);
        while (1); // Increase MAX_STRING_SIZE
    }

    // Display string
    return fputs(pStr, pStream);
}

//------------------------------------------------------------------------------
/// Outputs a formatted string on the DBGU stream. Format arguments are given
/// in a va_list instance.
/// \param pFormat  Format string
/// \param ap  Argument list.
//------------------------------------------------------------------------------
signed int vprintf(const char *pFormat, va_list ap)
{
    return vfprintf(stdout, pFormat, ap);
}

//------------------------------------------------------------------------------
/// Outputs a formatted string on the given stream, using a variable number of
/// arguments.
/// \param pStream  Output stream.
/// \param pFormat  Format string.
//------------------------------------------------------------------------------
signed int fprintf(FILE *pStream, const char *pFormat, ...)
{
    va_list ap;
    signed int result;

    // Forward call to vfprintf
    va_start(ap, pFormat);
    result = vfprintf(pStream, pFormat, ap);
    va_end(ap);

    return result;
}

//------------------------------------------------------------------------------
/// Outputs a formatted string on the DBGU stream, using a variable number of
/// arguments.
/// \param pFormat  Format string.
//------------------------------------------------------------------------------
signed int printf(const char *pFormat, ...)
{
    va_list ap;
    signed int result;

    // Forward call to vprintf
    va_start(ap, pFormat);
    result = vprintf(pFormat, ap);
    va_end(ap);

    return result;
}

//------------------------------------------------------------------------------
/// Writes a formatted string inside another string.
/// \param pStr  Storage string.
/// \param pFormat  Format string.
//------------------------------------------------------------------------------
signed int sprintf(char *pStr, const char *pFormat, ...)
{
    va_list ap;
    signed int result;

    // Forward call to vsprintf
    va_start(ap, pFormat);
    result = vsprintf(pStr, pFormat, ap);
    va_end(ap);

    return result;
}

//------------------------------------------------------------------------------
/// Outputs a string on stdout.
/// \param pStr  String to output.
//------------------------------------------------------------------------------
signed int puts(const char *pStr)
{
    return fputs(pStr, stdout);
}