Re: [xml] Newbie question about an example from the web site

[Menu Jacques <imj-219 bluewin ch>]

Hello,

Same problem on CentOS 7.1.

My environment contains:

23:25:30 (690) menu@ - ~ > echo $LC_TYPE 
iso_8859_1
23:25:48 (691) menu@ - ~ > echo $LANG
C
23:26:00 (692) menu@ - ~ > echo GDM_LANG
GDM_LANG

and I get:

23:27:02 (695) menu@ - ~/examples_libxml2 > ./EncodingConversionExample foo
--> content = foo
--> size = 4
--> out_size = 7
--> temp = 3
--> temp-size+1 = 0
conversion wasn't successful.
--> out = (null)
<?xml version="1.0" encoding="ISO-8859-1"?>
<root/>
23:27:20 (696) menu@ - ~/examples_libxml2 > ./EncodingConversionExample éöîà
--> content = éöîà
--> size = 9
--> out_size = 17
--> temp = 8
--> temp-size+1 = 0
conversion wasn't successful.
--> out = (null)
<?xml version="1.0" encoding="ISO-8859-1"?>
<root/>

I’m clearly doing something wrong, but what?

JM

> Le 25 nov. 2015 à 13:08, Menu Jacques <imj-219 bluewin ch> a écrit :
>
> I use:
>
> 13:07:34 (254) menu@ - ~/libxml2-git > apt list libxml2 libxml2-dev
> Listing... Done
> libxml2/stable,now 2.9.1+dfsg1-5 i386 [installed,automatic]
> libxml2-dev/stable,now 2.9.1+dfsg1-5 i386 [installed]
>
> on Debian 8 32bit (jessie)
>
> JM
>
> > Le 25 nov. 2015 à 11:17, Menu Jacques <imj-219 bluewin ch> a écrit :
> >
> > Hello folks,
> >
> > I’ve successfully built the examples from http://xmlsoft.org/tutorial/index.html, except the last one 
> > about encoding conversion.
> >
> > I added printouts to the original code to help (see below) and get:
> >
> > 10:51:35 (250) menu@ - ~/libxml2-git > ./EncodingConversionExample foo
> > --> content = foo
> > --> size = 4
> > --> out_size = 7
> > --> temp = 3
> > --> temp-size+1 = 0
> > conversion wasn't successful.
> > --> out = (null)
> > <?xml version="1.0" encoding="ISO-8859-1"?>
> > <root/>
> >
> > Thanks for your help!
> >
> > JM
> >
> > —
> >
> > 11:15:24 (251) menu@ - ~/libxml2-git > cat EncodingConversionExample.c
> > #include <string.h>
> > #include <libxml/parser.h>
> >
> >
> > unsigned char*
> > convert (unsigned char *in, char *encoding)
> > {
> >      unsigned char *out;
> >       int ret,size,out_size,temp;
> >       xmlCharEncodingHandlerPtr handler;
> >
> >       size = (int)strlen(in)+1; 
> >       out_size = size*2-1; 
> >       out = malloc((size_t)out_size); 
> >
> >       printf("--> size = %d\n", size);
> >       printf("--> out_size = %d\n", out_size);
> >
> >       if (out) {
> >               handler = xmlFindCharEncodingHandler(encoding);
> >
> >               if (!handler) {
> >                       printf("--> %s encoding handler not found\n", encoding);
> >                       free(out);
> >                       out = NULL;
> >               }
> >       }
> >
> >       if (out) {
> >               temp=size-1;
> >               printf("--> temp = %d\n", temp);
> >
> >               ret = handler->input(out, &out_size, in, &temp);
> >
> >               if (ret || temp-size+1) {
> >                       printf("--> temp-size+1 = %d\n", temp-size+1);
> >
> >                       if (ret) {
> >                               printf("conversion wasn't successful.\n");
> >                       } else {
> >                               printf("conversion wasn't successful. converted: %i octets.\n",temp);
> >                       }
> >
> >                       free(out);
> >                       out = NULL;
> >               } else {
> >                       out = realloc(out,out_size+1); 
> >                       out[out_size]=0; /*null terminating out*/
> >
> >               }
> >       } else {
> >               printf("no mem\n");
> >       }
> >       return (out);
> > }    
> >
> >
> > int
> > main(int argc, char **argv) {
> >
> >      unsigned char *content, *out;
> >      xmlDocPtr doc;
> >      xmlNodePtr rootnode;
> >      char *encoding = "ISO-8859-1";
> >      
> >              
> >      if (argc <= 1) {
> >              printf("Usage: %s content\n", argv[0]);
> >              return(0);
> >      }
> >
> >      content = argv[1];
> >       printf("--> content = %s\n", content);
> >
> >      out = convert(content, encoding);
> >       printf("--> out = %s\n", out);
> >
> >      doc = xmlNewDoc ("1.0");
> >      rootnode = xmlNewDocNode(doc, NULL, (const xmlChar*)"root", out);
> >      xmlDocSetRootElement(doc, rootnode);
> >
> >      xmlSaveFormatFileEnc("-", doc, encoding, 1);
> >      return (1);
> > }