load.c

Linux下利用NTP协议的网络时间同步客户端

static ag_bool
insertEnvVal(
    char*   pzBuf,
    int     bufSize,
    tCC*    pzName,
    tCC*    pzProgPath )
{
    char* pzDir = pzBuf;

    for (;;) {
        int ch = (int)*++pzName;
        if (! ISNAMECHAR( ch ))
            break;
        *(pzDir++) = (char)ch;
    }

    if (pzDir == pzBuf)
        return AG_FALSE;

    *pzDir = NUL;

    pzDir = getenv( pzBuf );

    /*
     *  Environment value not found -- skip the home list entry
     */
    if (pzDir == NULL)
        return AG_FALSE;

    if (strlen( pzDir ) + 1 + strlen( pzName ) >= bufSize)
        return AG_FALSE;

    sprintf( pzBuf, "%s%s", pzDir, pzName );
    return AG_TRUE;
}


LOCAL void
mungeString( char* pzTxt, tOptionLoadMode mode )
{
    char* pzE;

    if (mode == OPTION_LOAD_KEEP)
        return;

    if (isspace( (int)*pzTxt )) {
        char* pzS = pzTxt;
        char* pzD = pzTxt;
        while (isspace( (int)*++pzS ))  ;
        while ((*(pzD++) = *(pzS++)) != NUL)   ;
        pzE = pzD-1;
    } else
        pzE = pzTxt + strlen( pzTxt );

    while ((pzE > pzTxt) && isspace( (int)pzE[-1] ))  pzE--;
    *pzE = NUL;

    if (mode == OPTION_LOAD_UNCOOKED)
        return;

    switch (*pzTxt) {
    default: return;
    case '"':
    case '\'': break;
    }

    switch (pzE[-1]) {
    default: return;
    case '"':
    case '\'': break;
    }

    (void)ao_string_cook( pzTxt, NULL );
}


static char*
assembleArgValue( char* pzTxt, tOptionLoadMode mode )
{
    tSCC zBrk[] = " \t:=";
    char* pzEnd = strpbrk( pzTxt, zBrk );
    int   space_break;

    /*
     *  Not having an argument to a configurable name is okay.
     */
    if (pzEnd == NULL)
        return pzTxt + strlen(pzTxt);

    /*
     *  If we are keeping all whitespace, then the  modevalue starts with the
     *  character that follows the end of the configurable name, regardless
     *  of which character caused it.
     */
    if (mode == OPTION_LOAD_KEEP) {
        *(pzEnd++) = NUL;
        return pzEnd;
    }

    /*
     *  If the name ended on a white space character, remember that
     *  because we'll have to skip over an immediately following ':' or '='
     *  (and the white space following *that*).
     */
    space_break = isspace((int)*pzEnd);
    *(pzEnd++) = NUL;
    while (isspace((int)*pzEnd))  pzEnd++;
    if (space_break && ((*pzEnd == ':') || (*pzEnd == '=')))
        while (isspace((int)*++pzEnd))  ;

    return pzEnd;
}


/*
 *  Load an option from a block of text.  The text must start with the
 *  configurable/option name and be followed by its associated value.
 *  That value may be processed in any of several ways.  See "tOptionLoadMode"
 *  in autoopts.h.
 */
LOCAL void
loadOptionLine(
    tOptions*   pOpts,
    tOptState*  pOS,
    char*       pzLine,
    tDirection  direction,
    tOptionLoadMode   load_mode )
{
    while (isspace( (int)*pzLine ))  pzLine++;

    {
        char* pzArg = assembleArgValue( pzLine, load_mode );

        if (! SUCCESSFUL( longOptionFind( pOpts, pzLine, pOS )))
            return;
        if (pOS->flags & OPTST_NO_INIT)
            return;
        pOS->pzOptArg = pzArg;
    }

    switch (pOS->flags & (OPTST_IMM|OPTST_DISABLE_IMM)) {
    case 0:
        /*
         *  The selected option has no immediate action.
         *  THEREFORE, if the direction is PRESETTING
         *  THEN we skip this option.
         */
        if (PRESETTING(direction))
            return;
        break;

    case OPTST_IMM:
        if (PRESETTING(direction)) {
            /*
             *  We are in the presetting direction with an option we handle
             *  immediately for enablement, but normally for disablement.
             *  Therefore, skip if disabled.
             */
            if ((pOS->flags & OPTST_DISABLED) == 0)
                return;
        } else {
            /*
             *  We are in the processing direction with an option we handle
             *  immediately for enablement, but normally for disablement.
             *  Therefore, skip if NOT disabled.
             */
            if ((pOS->flags & OPTST_DISABLED) != 0)
                return;
        }
        break;

    case OPTST_DISABLE_IMM:
        if (PRESETTING(direction)) {
            /*
             *  We are in the presetting direction with an option we handle
             *  immediately for disablement, but normally for disablement.
             *  Therefore, skip if NOT disabled.
             */
            if ((pOS->flags & OPTST_DISABLED) != 0)
                return;
        } else {
            /*
             *  We are in the processing direction with an option we handle
             *  immediately for disablement, but normally for disablement.
             *  Therefore, skip if disabled.
             */
            if ((pOS->flags & OPTST_DISABLED) == 0)
                return;
        }
        break;

    case OPTST_IMM|OPTST_DISABLE_IMM:
        /*
         *  The selected option is always for immediate action.
         *  THEREFORE, if the direction is PROCESSING
         *  THEN we skip this option.
         */
        if (PROCESSING(direction))
            return;
        break;
    }

    /*
     *  Fix up the args.
     */
    if (OPTST_GET_ARGTYPE(pOS->pOD->fOptState) == OPARG_TYPE_NONE) {
        if (*pOS->pzOptArg != NUL)
            return;
        pOS->pzOptArg = NULL;

    } else if (pOS->pOD->fOptState & OPTST_ARG_OPTIONAL) {
        if (*pOS->pzOptArg == NUL)
             pOS->pzOptArg = NULL;
        else {
            AGDUPSTR( pOS->pzOptArg, pOS->pzOptArg, "option argument" );
            pOS->flags |= OPTST_ALLOC_ARG;
        }

    } else {
        if (*pOS->pzOptArg == NUL)
             pOS->pzOptArg = zNil;
        else {
            AGDUPSTR( pOS->pzOptArg, pOS->pzOptArg, "option argument" );
            pOS->flags |= OPTST_ALLOC_ARG;
        }
    }

    {
        tOptionLoadMode sv = option_load_mode;
        option_load_mode = load_mode;
        handleOption( pOpts, pOS );
        option_load_mode = sv;
    }
}


/*=export_func  optionLoadLine
 *
 * what:  process a string for an option name and value
 *
 * arg:   tOptions*,   pOpts,  program options descriptor
 * arg:   char const*, pzLine, NUL-terminated text
 *
 * doc:
 *
 *  This is a client program callable routine for setting options from, for
 *  example, the contents of a file that they read in.  Only one option may
 *  appear in the text.  It will be treated as a normal (non-preset) option.
 *
 *  When passed a pointer to the option struct and a string, it will find
 *  the option named by the first token on the string and set the option
 *  argument to the remainder of the string.  The caller must NUL terminate
 *  the string.  Any embedded new lines will be included in the option
 *  argument.  If the input looks like one or more quoted strings, then the
 *  input will be "cooked".  The "cooking" is identical to the string
 *  formation used in AutoGen definition files (@pxref{basic expression}),
 *  except that you may not use backquotes.
 *
 * err:   Invalid options are silently ignored.  Invalid option arguments
 *        will cause a warning to print, but the function should return.
=*/
void
optionLoadLine(
    tOptions*  pOpts,
    tCC*       pzLine )
{
    tOptState st = OPTSTATE_INITIALIZER(SET);
    char* pz;
    AGDUPSTR( pz, pzLine, "user option line" );
    loadOptionLine( pOpts, &st, pz, DIRECTION_PROCESS, OPTION_LOAD_COOKED );
    AGFREE( pz );
}
/*
 * Local Variables:
 * mode: C
 * c-file-style: "stroustrup"
 * indent-tabs-mode: nil
 * End:
 * end of autoopts/load.c */