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

[Menu Jacques <imj-219 bluewin ch>]

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);
> }