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unzip-6.0/fileio.c  view on Meta::CPAN

/************************/
/* Function do_string() */
/************************/

int do_string(__G__ length, option)   /* return PK-type error code */
    __GDEF
    unsigned int length;        /* without prototype, ush converted to this */
    int option;
{
    unsigned comment_bytes_left;
    unsigned int block_len;
    int error=PK_OK;
#ifdef AMIGA
    char tmp_fnote[2 * AMIGA_FILENOTELEN];   /* extra room for squozen chars */
#endif


/*---------------------------------------------------------------------------
    This function processes arbitrary-length (well, usually) strings.  Four
    major options are allowed:  SKIP, wherein the string is skipped (pretty
    logical, eh?); DISPLAY, wherein the string is printed to standard output
    after undergoing any necessary or unnecessary character conversions;
    DS_FN, wherein the string is put into the filename[] array after under-
    going appropriate conversions (including case-conversion, if that is
    indicated: see the global variable pInfo->lcflag); and EXTRA_FIELD,
    wherein the `string' is assumed to be an extra field and is copied to
    the (freshly malloced) buffer G.extra_field.  The third option should
    be OK since filename is dimensioned at 1025, but we check anyway.

    The string, by the way, is assumed to start at the current file-pointer
    position; its length is given by 'length'.  So start off by checking the
    length of the string:  if zero, we're already done.
  ---------------------------------------------------------------------------*/

    if (!length)
        return PK_COOL;

    switch (option) {

#if (defined(SFX) && defined(CHEAP_SFX_AUTORUN))
    /*
     * Special case: See if the comment begins with an autorun command line.
     * Save that and display (or skip) the remainder.
     */

    case CHECK_AUTORUN:
    case CHECK_AUTORUN_Q:
        comment_bytes_left = length;
        if (length >= 10)
        {
            block_len = readbuf(__G__ (char *)G.outbuf, 10);
            if (block_len == 0)
                return PK_EOF;
            comment_bytes_left -= block_len;
            G.outbuf[block_len] = '\0';
            if (!strcmp((char *)G.outbuf, "$AUTORUN$>")) {
                char *eol;
                length -= 10;
                block_len = readbuf(__G__ G.autorun_command,
                                    MIN(length, sizeof(G.autorun_command)-1));
                if (block_len == 0)
                    return PK_EOF;
                comment_bytes_left -= block_len;
                G.autorun_command[block_len] = '\0';
                A_TO_N(G.autorun_command);
                eol = strchr(G.autorun_command, '\n');
                if (!eol)
                    eol = G.autorun_command + strlen(G.autorun_command) - 1;
                length -= eol + 1 - G.autorun_command;
                while (eol >= G.autorun_command && isspace(*eol))
                    *eol-- = '\0';
#if (defined(WIN32) && !defined(_WIN32_WCE))
                /* Win9x console always uses OEM character coding, and
                   WinNT console is set to OEM charset by default, too */
                INTERN_TO_OEM(G.autorun_command, G.autorun_command);
#endif /* (WIN32 && !_WIN32_WCE) */
            }
        }
        if (option == CHECK_AUTORUN_Q)  /* don't display the remainder */
            length = 0;
        /* seek to beginning of remaining part of comment -- rewind if */
        /* displaying entire comment, or skip to end if discarding it  */
        seek_zipf(__G__ G.cur_zipfile_bufstart - G.extra_bytes +
                  (G.inptr - G.inbuf) + comment_bytes_left - length);
        if (!length)
            break;
        /*  FALL THROUGH...  */
#endif /* SFX && CHEAP_SFX_AUTORUN */

    /*
     * First normal case:  print string on standard output.  First set loop
     * variables, then loop through the comment in chunks of OUTBUFSIZ bytes,
     * converting formats and printing as we go.  The second half of the
     * loop conditional was added because the file might be truncated, in
     * which case comment_bytes_left will remain at some non-zero value for
     * all time.  outbuf and slide are used as scratch buffers because they
     * are available (we should be either before or in between any file pro-
     * cessing).
     */

    case DISPLAY:
    case DISPL_8:
        comment_bytes_left = length;
        block_len = OUTBUFSIZ;       /* for the while statement, first time */
        while (comment_bytes_left > 0 && block_len > 0) {
            register uch *p = G.outbuf;
            register uch *q = G.outbuf;

            if ((block_len = readbuf(__G__ (char *)G.outbuf,
                   MIN((unsigned)OUTBUFSIZ, comment_bytes_left))) == 0)
                return PK_EOF;
            comment_bytes_left -= block_len;

            /* this is why we allocated an extra byte for outbuf:  terminate
             *  with zero (ASCIIZ) */
            G.outbuf[block_len] = '\0';

            /* remove all ASCII carriage returns from comment before printing
             * (since used before A_TO_N(), check for CR instead of '\r')
             */
            while (*p) {
                while (*p == CR)
                    ++p;
                *q++ = *p++;
            }
            /* could check whether (p - outbuf) == block_len here */
            *q = '\0';

            if (option == DISPL_8) {
                /* translate the text coded in the entry's host-dependent
                   "extended ASCII" charset into the compiler's (system's)