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// CVS $Id$
// Author: Pier Fumagalli <mailto:pier.fumagalli@eng.sun.com>

#include <wa.h>

/* The list of configured hosts */
wa_callback *wa_callbacks=NULL;

/**
 * Add a component to the the current SERVER_SOFTWARE string and return the
 * new value.
 *
 * @param component The new component to add to the SERVER_SOFTWARE string
 *                  or NULL if no modification is necessary.
 * @return The updated SERVER_SOFTWARE string.
 */
const char *wa_callback_serverinfo(const char *component) {
    if (wa_callbacks==NULL) return("Unknown");
    return((*wa_callbacks->serverinfo)(component));
}

/**
 * Log data on the web server log file.
 *
 * @param f The source file of this log entry.
 * @param l The line number within the source file of this log entry.
 * @param r The wa_request structure associated with the current request,
 *          or NULL.
 * @param fmt The format string (printf style).
 * @param ... All other parameters (if any) depending on the format.
 */
void wa_callback_log(const char *f,int l,wa_request *r,const char *fmt,...) {
    va_list ap;
    char buf[1024];
    int ret;

    if (wa_callbacks==NULL) return;

    va_start(ap,fmt);
    ret=vsnprintf(buf,1024,fmt,ap);
    if (ret<1) {
        (*wa_callbacks->log)(WA_LOG,r,"Cannot format log message");
    } else if (ret>1023) {
        (*wa_callbacks->log)(WA_LOG,r,"Log message too long");
    } else {
        (*wa_callbacks->log)(f,l,r,buf);
    }
    va_end(ap);
}

/**
 * Log debugging informations data on the web server log file.
 *
 * @param f The source file of this log entry.
 * @param l The line number within the source file of this log entry.
 * @param r The wa_request structure associated with the current request,
 *          or NULL.
 * @param fmt The format string (printf style).
 * @param ... All other parameters (if any) depending on the format.
 */
void wa_callback_debug(const char *f,int l,wa_request *r,const char *fmt,...) {
#ifdef DEBUG
    va_list ap;
    char buf[1024];
    int ret;

    if (wa_callbacks==NULL) return;

    va_start(ap,fmt);
    ret=vsnprintf(buf,1024,fmt,ap);
    if (ret<1) {
        wa_callback_log(WA_LOG,r,"[%s:%d] Cannot format log message",WA_LOG);
    } else if (ret>1023) {
        wa_callback_log(WA_LOG,r,"[%s:%d] Log message too long",WA_LOG);
    } else {
        wa_callback_log(f,l,r,"[%s:%d] %s",f,l,buf);
    }
    va_end(ap);
#endif
}

/**
 * Allocate memory while processing a request. (The memory allocated by
 * this fuction must be released after the request is processed).
 *
 * @param r The request member associated with this call.
 * @param size The size in bytes of the memory to allocate.
 * @return A pointer to the allocated memory or NULL.
 */
void *wa_callback_alloc(wa_request *r, int size) {
    if (wa_callbacks==NULL) return(NULL);
    if (r==NULL) {
        wa_callback_debug(WA_LOG,r,"Null wa_request member specified");
        return(NULL);
    }
    return((*wa_callbacks->alloc)(r, size));
}

/**
 * Read part of the request content.
 *
 * @param r The request member associated with this call.
 * @param buf The buffer that will hold the data.
 * @param size The buffer length.
 * @return The number of bytes read, 0 on end of file or -1 on error.
 */
int wa_callback_read(wa_request *r, char *buf, int size) {
    if (wa_callbacks==NULL) return(-1);
    if (r==NULL) {
        wa_callback_debug(WA_LOG,r,"Null wa_request member specified");
        return(-1);
    }
    return((*wa_callbacks->read)(r,buf,size));
}

/**
 * Set the HTTP response status code.
 *
 * @param r The request member associated with this call.
 * @param status The HTTP status code for the response.
 * @return TRUE on success, FALSE otherwise
 */
boolean wa_callback_setstatus(wa_request *r, int status) {
    if (wa_callbacks==NULL) return(FALSE);
    if (r==NULL) {
        wa_callback_debug(WA_LOG,r,"Null wa_request member specified");
        return(FALSE);
    }
    return((*wa_callbacks->setstatus)(r,status));
}

/**
 * Set the HTTP response mime content type.
 *
 * @param r The request member associated with this call.
 * @param type The mime content type of the HTTP response.
 * @return TRUE on success, FALSE otherwise
 */
boolean wa_callback_settype(wa_request *r, char *type) {
    if (wa_callbacks==NULL) return(FALSE);
    if (r==NULL) {
        wa_callback_debug(WA_LOG,r,"Null wa_request member specified");
        return(FALSE);
    }
    return((*wa_callbacks->settype)(r,type));
}

/**
 * Set an HTTP mime header.
 *
 * @param r The request member associated with this call.
 * @param n The mime header name.
 * @param v The mime header value.
 * @return TRUE on success, FALSE otherwise
 */
boolean wa_callback_setheader(wa_request *r, char *n, char *v) {
    if (wa_callbacks==NULL) return(FALSE);
    if (r==NULL) {
        wa_callback_debug(WA_LOG,r,"Null wa_request member specified");
        return(FALSE);
    }
    return((*wa_callbacks->setheader)(r,n,v));
}


/**
 * Commit the first part of the response (status and headers).
 *
 * @param r The request member associated with this call.
 * @return TRUE on success, FALSE otherwise
 */
boolean wa_callback_commit(wa_request *r) {
    if (wa_callbacks==NULL) return(FALSE);
    if (r==NULL) {
        wa_callback_debug(WA_LOG,r,"Null wa_request member specified");
        return(FALSE);
    }
    return((*wa_callbacks->commit)(r));
}

/**
 * Write part of the response data back to the client.
 *
 * @param r The request member associated with this call.
 * @param buf The buffer containing the data to be written.
 * @param len The number of characters to be written.
 * @return The number of characters written to the client or -1 on error.
 */
int wa_callback_write(wa_request *r, char *buf, int size) {
    if (wa_callbacks==NULL) return(-1);
    if (r==NULL) {
        wa_callback_debug(WA_LOG,r,"Null wa_request member specified");
        return(-1);
    }
    return((*wa_callbacks->write)(r,buf,size));
}

/**
 * Flush any unwritten response data to the client.
 *
 * @param r The request member associated with this call.
 * @return TRUE on success, FALSE otherwise
 */
boolean wa_callback_flush(wa_request *r) {
    if (wa_callbacks==NULL) return(FALSE);
    if (r==NULL) {
        wa_callback_debug(WA_LOG,r,"Null wa_request member specified");
        return(FALSE);
    }
    return((*wa_callbacks->flush)(r));
}

/**
 * Print a message back to the client using the printf standard.
 *
 * @param r The request member associated with this call.
 * @param fmt The format string (printf style).
 * @param ... All other parameters (if any) depending on the format.
 * @return The number of characters written to the client or -1 on error.
 */
int wa_callback_printf(wa_request *r, const char *fmt, ...) {
    va_list ap;
    char *buf=NULL;
    int ret;

    if (wa_callbacks==NULL) return(-1);
    if (r==NULL) {
        wa_callback_debug(WA_LOG,r,"Null wa_request member specified");
        return(FALSE);
    }

    // Allocate some data for the buffer
    buf=(char *)(*wa_callbacks->alloc)(r,1024*sizeof(char));
    if (buf==NULL) {
        wa_callback_debug(WA_LOG,r,"Cannot allocate buffer");
        return(-1);
    }

    // Check if we can write some data.
    if (wa_callbacks==NULL) {
        return(-1);
    }

    // Try to fill our buffer with printf data
    va_start(ap,fmt);
    ret=vsnprintf(buf,1024,fmt,ap);

    // If vsnprintf returned null, we weren't able to format the message
    if (ret<0) {
        wa_callback_log(WA_LOG,r,"Cannot format message");
        va_end(ap);
        return(-1);

    // If vsnprintf is greater than 1024 the buffer was too small
    } else if (ret>1024) {
        // Reallocate the buffer for the bigger message and check if we were
        // able to print the message.
        buf=(char *)(*wa_callbacks->alloc)(r,(ret+1)*sizeof(char));
        if (buf==NULL) {
            va_end(ap);
            wa_callback_debug(WA_LOG,r,"Cannot allocate buffer");
            return(-1);
        }
        ret=vsnprintf(buf,ret+1,fmt,ap);
        if (ret<0) {
            wa_callback_log(WA_LOG,r,"Cannot format message");
            va_end(ap);
            return(-1);
        }
    }

    va_end(ap);
    return(wa_callback_write(r,buf,ret));
}