htvmsutils.c

elinks下lynx是最重要的二个文本浏览器, 在linux下非常实用, lynx比elinks早的多, 目前好像停止开发, 这是lynx源代码

#define PUTC(c) (*targetClass.put_character)(target, c)
#define PUTS(s) (*targetClass.put_string)(target, s)
#define START(e) (*targetClass.start_element)(target, e, 0, 0, -1, 0)
#define END(e) (*targetClass.end_element)(target, e, 0)
#define FREE_TARGET (*targetClass._free)(target)
#define ABORT_TARGET (*targetClass._free)(target)
struct _HTStructured {
	CONST HTStructuredClass *	isa;
	/* ... */
};

#define STRUCT_DIRENT struct dirent

PRIVATE char * months[12] = {
    "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"
};

typedef struct _VMSEntryInfo {
    char *       filename;
    char *       type;
    char *       date;
    unsigned int size;
    BOOLEAN      display;  /* show this entry? */
} VMSEntryInfo;

PRIVATE void free_VMSEntryInfo_contents ARGS1(VMSEntryInfo *,entry_info)
{
    if (entry_info) {
	FREE(entry_info->filename);
	FREE(entry_info->type);
	FREE(entry_info->date);
    }
   /* dont free the struct */
}

PUBLIC int compare_VMSEntryInfo_structs ARGS2(VMSEntryInfo *,entry1,
					      VMSEntryInfo *,entry2)
{
    int i, status;
    char date1[16], date2[16], time1[8], time2[8], month[4];

    switch(HTfileSortMethod)
      {
	case FILE_BY_SIZE:
			/* both equal or both 0 */
			if(entry1->size == entry2->size)
			    return(strcasecomp(entry1->filename,
					       entry2->filename));
			else
			    if(entry1->size > entry2->size)
				return(1);
			    else
				return(-1);
	case FILE_BY_TYPE:
			if(entry1->type && entry2->type) {
			    status = strcasecomp(entry1->type, entry2->type);
			    if(status)
				return(status);
			    /* else fall to filename comparison */
			}
			return (strcasecomp(entry1->filename,
					    entry2->filename));
	case FILE_BY_DATE:
			if(entry1->date && entry2->date) {
			    /*
			    ** Make sure we have the correct length. - FM
			    */
			    if (strlen(entry1->date) != 12 ||
				strlen(entry2->date) != 12) {
				return (strcasecomp(entry1->filename,
						    entry2->filename));
			    }
			    /*
			    ** Set up for sorting in reverse
			    ** chronological order. - FM
			    */
			    if (entry1->date[7] != ' ') {
				strcpy(date1, "9999");
				strcpy(time1, (char *)&entry1->date[7]);
			    } else {
				strcpy(date1, (char *)&entry1->date[8]);
				strcpy(time1, "00:00");
			    }
			    strncpy(month, entry1->date, 3);
			    month[3] = '\0';
			    for (i = 0; i < 12; i++) {
				if (!strcasecomp(month, months[i])) {
				    break;
				}
			    }
			    i++;
			    sprintf(month, "%02d", i);
			    strcat(date1, month);
			    strncat(date1, (char *)&entry1->date[4], 2);
			    date1[8] = '\0';
			    if (date1[6] == ' ') {
				date1[6] = '0';
			    }
			    strcat(date1, time1);
			    if (entry2->date[7] != ' ') {
				strcpy(date2, "9999");
				strcpy(time2, (char *)&entry2->date[7]);
			    } else {
				strcpy(date2, (char *)&entry2->date[8]);
				strcpy(time2, "00:00");
			    }
			    strncpy(month, entry2->date, 3);
			    month[3] = '\0';
			    for (i = 0; i < 12; i++) {
				if (!strcasecomp(month, months[i])) {
				    break;
				}
			    }
			    i++;
			    sprintf(month, "%02d", i);
			    strcat(date2, month);
			    strncat(date2, (char *)&entry2->date[4], 2);
			    date2[8] = '\0';
			    if (date2[6] == ' ') {
				date2[6] = '0';
			    }
			    strcat(date2, time2);
			    /*
			    ** Do the comparison. - FM
			    */
			    status = strcasecomp(date2, date1);
			    if(status)
				return(status);
			    /* else fall to filename comparison */
			}
			return (strcasecomp(entry1->filename,
					    entry2->filename));
	case FILE_BY_NAME:
	default:
			return (strcmp(entry1->filename,
					    entry2->filename));
      }
}


/*							HTVMSBrowseDir()
**
**	This function generates a directory listing as an HTML-object
**	for local file URL's.  It assumes the first two elements of
**	of the path are a device followed by a directory:
**
**		file://localhost/device/directory[/[foo]]
**
**	Will not accept 000000 as a directory name.
**	Will offer links to parent through the top directory, unless
**	a terminal slash was included in the calling URL.
**
**	Returns HT_LOADED on success, HTLoadError() messages on error.
**
**	Developed for Lynx by Foteos Macrides ([e-mail]).
*/
PUBLIC int HTVMSBrowseDir ARGS4(
	CONST char *,		address,
	HTParentAnchor *,	anchor,
	HTFormat,		format_out,
	HTStream *,		sink
)
{
    HTStructured* target;
    HTStructuredClass targetClass;
    char *pathname = HTParse(address, "", PARSE_PATH + PARSE_PUNCTUATION);
    char *tail = NULL;
    char *title = NULL;
    char *header = NULL;
    char *parent = NULL;
    char *relative = NULL;
    char *cp, *cp1;
    int  pathend, len;
    DIR *dp;
    struct stat file_info;
    time_t NowTime;
    static char ThisYear[8];
    VMSEntryInfo *entry_info = 0;
    char string_buffer[64];

    HTUnEscape(pathname);
    CTRACE((tfp,"HTVMSBrowseDir: Browsing `%s\'\n", pathname));

    /*
     *  Require at least two elements (presumably a device and directory)
     *  and disallow the device root (000000 directory).  Symbolic paths
     *  (e.g., sys$help) should have been translated and expanded (e.g.,
     *  to /sys$sysroot/syshlp) before calling this routine.
     */
    if (((*pathname != '/') ||
	 (cp = strchr(pathname+1, '/')) == NULL ||
	 *(cp + 1) == '\0' ||
	 0 == strncmp((cp + 1), "000000", 6)) ||
	(dp = HTVMSopendir(pathname)) == NULL) {
	FREE(pathname);
	return HTLoadError(sink, 403, COULD_NOT_ACCESS_DIR);
    }

    /*
     *  Set up the output stream.
     */
    _HTProgress (BUILDING_DIR_LIST);
    if (UCLYhndl_HTFile_for_unspec >= 0) {
	HTAnchor_setUCInfoStage(anchor,
				UCLYhndl_HTFile_for_unspec,
				UCT_STAGE_PARSER,
				UCT_SETBY_DEFAULT);
    }
    target = HTML_new(anchor, format_out, sink);
    targetClass = *(target->isa);

    /*
     *  Set up the offset string of the anchor reference,
     *  and strings for the title and header.
     */
    cp = strrchr(pathname, '/');  /* find lastslash */
    StrAllocCopy(tail, (cp+1)); /* take slash off the beginning */
    if (*tail != '\0') {
	StrAllocCopy(title, tail);
	*cp = '\0';
	if ((cp1=strrchr(pathname, '/')) != NULL &&
	    cp1 != pathname &&
	    strncmp((cp1+1), "000000", 6))
	    StrAllocCopy(parent, (cp1+1));
	*cp = '/';
    } else {
	pathname[strlen(pathname)-1] = '\0';
	cp = strrchr(pathname, '/');
	StrAllocCopy(title, (cp+1));
	pathname[strlen(pathname)] = '/';
    }
    StrAllocCopy(header, pathname);

    /*
     *  Initialize path name for HTStat().
     */
    pathend = strlen(pathname);
    if (*(pathname+pathend-1) != '/') {
	StrAllocCat(pathname, "/");
	pathend++;
    }

    /*
     *  Output the title and header.
     */
    START(HTML_HTML);
    PUTC('\n');
    START(HTML_HEAD);
    PUTC('\n');
    HTUnEscape(title);
    START(HTML_TITLE);
    PUTS(title);
    PUTS(" directory");
    END(HTML_TITLE);
    PUTC('\n');
    FREE(title);
    END(HTML_HEAD);
    PUTC('\n');
    START(HTML_BODY);
    PUTC('\n');
    HTUnEscape(header);
    START(HTML_H1);
    PUTS(header);
    END(HTML_H1);
    PUTC('\n');
    if (HTDirReadme == HT_DIR_README_TOP) {
	FILE * fp;
	if (header[strlen(header)-1] != '/')
	    StrAllocCat(header, "/");
	StrAllocCat(header, HT_DIR_README_FILE);
	if ((fp = fopen(header,	 "r")) != NULL) {
	    START(HTML_PRE);
	    for(;;) {
		char c = fgetc(fp);
		if (c == (char)EOF)
		    break;
#ifdef NOTDEFINED
		switch (c) {
		    case '&':
		    case '<':
		    case '>':
			PUTC('&');
			PUTC('#');
			PUTC((char)(c / 10));
			PUTC((char) (c % 10));
			PUTC(';');
			break;
		    default:
			PUTC(c);
		}
#else
		PUTC(c);
#endif /* NOTDEFINED */
	    }
	    END(HTML_PRE);
	    fclose(fp);
	}
    }
    FREE(header);
    if (parent) {
	HTSprintf0(&relative, "%s/..", tail);
	HTStartAnchor(target, "", relative);
	PUTS("Up to ");
	HTUnEscape(parent);
	PUTS(parent);
	END(HTML_A);
	START(HTML_P);
	PUTC('\n');
	FREE(relative);
	FREE(parent);
    }

    /*
     *  Set up the date comparison.
     */
    NowTime = time(NULL);
    strcpy(ThisYear, (char *)ctime(&NowTime)+20);
    ThisYear[4] = '\0';

    /*
     * Now, generate the Btree and put it out to the output stream.
     */
    {
	char dottest = 2;	/* To avoid two strcmp() each time */
	STRUCT_DIRENT *dirbuf;
	HTBTree *bt;

	/* Set up sort key and initialize BTree */
	bt = HTBTree_new((HTComparer) compare_VMSEntryInfo_structs);

	/* Build tree */
	while ((dirbuf = HTVMSreaddir(dp))) {
	    HTAtom *encoding = NULL;
	    HTFormat format;

	    /* Skip if not used */
	    if (!dirbuf->d_ino)	{
		continue;
	    }

	    /* Current and parent directories are never shown in list */
	    if (dottest && (!strcmp(dirbuf->d_name, ".") ||
			    !strcmp(dirbuf->d_name, ".."))) {
		dottest--;
		continue;
	    }

	    /* Don't show the selective enabling file
	     * unless version numbers are included */
	    if (!strcasecomp(dirbuf->d_name, HT_DIR_ENABLE_FILE)) {
		continue;
	    }

	    /* Skip files beginning with a dot? */
	    if ((no_dotfiles || !show_dotfiles) && *dirbuf->d_name == '.') {
		continue;
	    }

	    /* OK, make an lstat() and get a key ready. */
	    *(pathname+pathend) = '\0';
	    StrAllocCat(pathname, dirbuf->d_name);
	    if (HTStat(pathname, &file_info)) {
		/* for VMS the failure here means the file is not readable...
		   we however continue to browse through the directory... */
		continue;
	    }
	    entry_info = (VMSEntryInfo *)malloc(sizeof(VMSEntryInfo));
	    if (entry_info == NULL)
		outofmem(__FILE__, "HTVMSBrowseDir");
	    entry_info->type = 0;
	    entry_info->size = 0;
	    entry_info->date = 0;
	    entry_info->filename = 0;
	    entry_info->display = TRUE;

	    /* Get the type */
	    format = HTFileFormat(dirbuf->d_name, &encoding,
				  (CONST char **)&cp);
	    if (!cp) {
		if(!strncmp(HTAtom_name(format), "application",11))
		{
		    cp = HTAtom_name(format) + 12;
		    if(!strncmp(cp,"x-", 2))
			cp += 2;
		}
		else
		    cp = HTAtom_name(format);
	    }
	    StrAllocCopy(entry_info->type, cp);

	    StrAllocCopy(entry_info->filename, dirbuf->d_name);
	    if (S_ISDIR(file_info.st_mode)) {
		/* strip .DIR part... */
		char *dot;
		dot = strstr(entry_info->filename, ".DIR");
		if (dot)
		   *dot = '\0';
		LYLowerCase(entry_info->filename);
		StrAllocCopy(entry_info->type, "Directory");
	    } else {
		if ((cp = strstr(entry_info->filename, "READ")) == NULL) {
		    cp = entry_info->filename;
		} else {
		    cp += 4;
		    if (!strncmp(cp, "ME", 2)) {
			cp += 2;
			while (cp && *cp && *cp != '.') {
			    cp++;
			}
		    } else if (!strncmp(cp, ".ME", 3)) {
			cp = (entry_info->filename +
			      strlen(entry_info->filename));
		    } else {
			cp = entry_info->filename;
		    }
		}
		LYLowerCase(cp);
		if (((len = strlen(entry_info->filename)) > 2) &&
		    entry_info->filename[len-1] == 'z') {
		    if (entry_info->filename[len-2] == '.' ||
			entry_info->filename[len-2] == '_')
			entry_info->filename[len-1] = 'Z';
		}
	    }

	    /* Get the date */
	    {
		char *t = (char *)ctime((CONST time_t *)&file_info.st_ctime);
		*(t+24) = '\0';

		StrAllocCopy(entry_info->date, (t+4));
		*((entry_info->date)+7) = '\0';
		if ((atoi((t+19))) < atoi(ThisYear))
		    StrAllocCat(entry_info->date,  (t+19));
		else {
		    StrAllocCat(entry_info->date, (t+11));
		    *((entry_info->date)+12) = '\0';
		}
	    }

	    /* Get the size */
	    if (!S_ISDIR(file_info.st_mode))
		entry_info->size = (unsigned int)file_info.st_size;
	    else
		entry_info->size = 0;

	    /* Now, update the BTree etc. */
	    if(entry_info->display)
	      {
		 CTRACE((tfp,"Adding file to BTree: %s\n",
						      entry_info->filename));
		 HTBTree_add(bt, entry_info);
	      }

	} /* End while HTVMSreaddir() */

	FREE(pathname);
	HTVMSclosedir(dp);

	START(HTML_PRE);
	/*
	 * Run through the BTree printing out in order
	 */
	{
	    HTBTElement * ele;
	    int i;
	    for (ele = HTBTree_next(bt, NULL);
		 ele != NULL;
		 ele = HTBTree_next(bt, ele))
	    {
		entry_info = (VMSEntryInfo *)HTBTree_object(ele);

		/* Output the date */
		if(entry_info->date)
		       {
			     PUTS(entry_info->date);
			     PUTS("  ");
		       }
		else
			PUTS("     * ");

		/* Output the type */
		if(entry_info->type)
		  {
		    for(i = 0; entry_info->type[i] != '\0' && i < 15; i++)
			PUTC(entry_info->type[i]);
		    for(; i < 17; i++)
			PUTC(' ');

		  }

		/* Output the link for the name */
		HTDirEntry(target, tail, entry_info->filename);
		PUTS(entry_info->filename);
		END(HTML_A);

		/* Output the size */
		if(entry_info->size)
		  {
			  if(entry_info->size < 1024)
			      sprintf(string_buffer,"  %d bytes",
							entry_info->size);
			  else
			      sprintf(string_buffer,"  %dKb",
							entry_info->size/1024);
			  PUTS(string_buffer);
		  }

		PUTC('\n'); /* end of this entry */

		free_VMSEntryInfo_contents(entry_info);
	    }
	}

	HTBTreeAndObject_free(bt);

    } /* End of both BTree loops */

    /*
     *  Complete the output stream.
     */
    END(HTML_PRE);
    PUTC('\n');
    END(HTML_BODY);
    PUTC('\n');
    END(HTML_HTML);
    PUTC('\n');
    FREE(tail);
    FREE_TARGET;

    return HT_LOADED;

} /* End of directory reading section */

/*
 * Remove all versions of the given file.  We assume there are no permissions
 * problems, since we do this mainly for removing temporary files.
 */
int HTVMS_remove(char *filename)
{
    int code = remove(filename);	/* return the first status code */
    while (remove(filename) == 0)
	;
    return code;
}

/*
 * Remove all older versions of the given file.  We may fail to remove some
 * version due to permissions -- the loop stops either at that point, or when
 * we run out of older versions to remove.
 */
void HTVMS_purge(char *filename)
{
    char *older_file = 0;
    char *oldest_file = 0;
    struct stat sb;

    StrAllocCopy(older_file, filename);
    StrAllocCat(older_file, ";-1");

    while (remove(older_file) == 0)
	;
    /*
     * If we do not have any more older versions, it is safe to rename the
     * current file to version #1.
     */
    if (stat(older_file, &sb) != 0) {
	StrAllocCopy(oldest_file, filename);
	StrAllocCat(oldest_file, ";1");
	rename(older_file, oldest_file);
	FREE(oldest_file);
    }

    FREE(older_file);
}