Content does not get replaced

[Adelino Monteiro]

Hello,

I'm writing my first module (actually a copy from mod_strip with some simple
modifications)

I have this simple function that for testing purposes should simply make a
simple substitution of all chars to A. I used gdb and chain_link->buf->start
indeed has all the  characters replaced with A. However the output in the
end is the original file without any other modification.

Could someone shed some light on this mistery?

Thanks

AM

static ngx_int_t
ngx_http_strip_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
    ngx_http_strip_ctx_t *ctx;
    ngx_chain_t          *chain_link;


    u_char *reader;
    u_char *writer;

    ngx_log_t   *log;

    log = r->connection->log;

    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, log, 0, "In strip strip body filter 1
");

    ctx = ngx_http_get_module_ctx(r, ngx_http_strip_filter_module);
    if (ctx == NULL) {
        ngx_log_debug0(NGX_LOG_DEBUG_HTTP, log, 0, "In strip strip body
filter 2 ");
        return ngx_http_next_body_filter(r, in);
    }
    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, log, 0, "In strip strip body filter 3
");


    for (chain_link = in; chain_link; chain_link = chain_link->next) {
        for (writer = chain_link->buf->pos, reader = chain_link->buf->pos;
reader < chain_link->buf->last; reader++) {
            ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0, "w: \"%c\"",
*reader);

            *reader = 'A' ;
            if (reader < chain_link->buf->last)
                        *writer++ = *reader;
        }
            ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0, "In strip_body_filter
writer: \"%s\"", writer);

        chain_link->buf->last = writer;

    }

    return ngx_http_next_body_filter(r, in);
}
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