path: root/xc/unsupported/lib/PHIGS/c_binding/cb_err.c

/* $XConsortium: cb_err.c,v 5.4 94/04/17 20:40:45 eswu Exp $ */

/***********************************************************

Copyright (c) 1989, 1990, 1991  X Consortium

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Copyright 1989, 1990, 1991 by Sun Microsystems, Inc. 

                        All Rights Reserved

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******************************************************************/

/* Error functions for the PHIGS C binding */

#include "phg.h"
#include "cp.h"
#include "cb_priv.h"

void
pset_err_hand_mode( mode)
    Perr_mode	mode;	/* error handling mode	*/
{
    Phg_args			cp_args;

    if ( CB_ENTRY_CHECK( phg_cur_cph, ERR2, Pfn_set_err_hand_mode)) {
	cp_args.data.idata = (Pint)mode;
	CP_FUNC( phg_cur_cph, CP_FUNC_OP_SET_ERR_HAND_MODE, &cp_args, NULL);
    }
}

void
pinq_err_hand_mode( error_ind, mode)
    Pint	*error_ind;	/* OUT error indicator	*/
    Perr_mode	*mode;		/* OUT error mode	*/
{
    if ( CB_ENTRY_CHECK( phg_cur_cph, 0, Pfn_INQUIRY)) {
	*error_ind = 0;
	*mode = phg_cur_cph->erh->mode;
    } else
	*error_ind = ERR2;
}

void
perr_log( errnum, funcnum, fname)
    Pint	errnum;
    Pint	funcnum;
    char	*fname;
{
    FILE	*erf;
    char	msg_buf[CB_MAX_ERR_MSG_LENGTH];

    phg_cb_format_err_msg( PHG_C_BINDING, errnum, funcnum, msg_buf);
    if ( fname && (erf = fopen( fname, "a"))) {
	(void) fprintf( erf, "%s", msg_buf);
	(void) fclose( erf);
    } else {
	(void) fprintf( stderr, "%s", msg_buf);
    }
}

void
pset_err_hand( new_err_hand, old_err_hand )
    void	(*new_err_hand)();
    void	(**old_err_hand)();
{
    *old_err_hand = phg_errhandle;
    phg_errhandle = new_err_hand;
}

extern char *phg_path();


static	int  err_punt_msg();
static char  err_msg_format[] = "PHIGS error %d in %s: %s\n";

static FILE *errmsgfile, *funcmsgfile;

#define MSG_BUF_SIZE	1024

static int
err_lookup_string (fn, num, msgbuf, msgbufsize)
    FILE *fn;
    int num;
    char *msgbuf;
    int msgbufsize;
{
    int curnum = -9999;

    /* look for the message with num at it's start */
    do { 
	if (fgets (msgbuf, msgbufsize, fn) == NULL) {
		return FALSE;
	}
	(void) sscanf (msgbuf, "%d", &curnum);
    } while (curnum != num);
    return TRUE;
}

static void
err_add_nl (buf, linelen)	/* add new lines to long message */
    char	*buf;
    int		linelen;
{
    char *p;

    if (strlen (buf) > linelen) {
	p = buf + linelen;
	while (--p != buf)
            /* replace blank with new line, check for more. */
            if (*p == ' ') {
                *p = '\n';
		err_add_nl (p+1, linelen);
		break;
        }
    }
}

/* Create the PHIGS error message and place it in "buf."  The message
 * contains the new line char.
 */

void
phg_cb_format_err_msg( binding, errnum, funcnum, buf )
    int		binding;	/* IN: binding that's calling */
    int		errnum;		/* IN: error number */
    int		funcnum;	/* IN: function id */
    char	*buf;		/* OUT: error message */
{
    char msgbuf [MSG_BUF_SIZE];
    char funcbuf [MSG_BUF_SIZE];
    char *msgtext, *funcname = (char*) NULL, *msgnl;

    /* if the Function Name file isn't open, open it */
    if (funcmsgfile == NULL) {
	char *funcfname;

        if( (!(funcfname = phg_path( FUNCNAME_FILE_NAME, (Err_handle)NULL, 0)))
	    || ((funcmsgfile = fopen (funcfname, "r")) == NULL) ) {
	    (void) err_punt_msg( errnum, funcnum, funcname, buf );
	    return;
	}
    } else
	rewind (funcmsgfile);	/* start search at start of file */

    /* if the errmessage file isn't open, open it */
    if (errmsgfile == NULL) {
	char *errfname;

        if( (!(errfname = phg_path( ERRMSG_FILE_NAME, (Err_handle)NULL, 0)))
	    || ((errmsgfile = fopen (errfname, "r")) == NULL) ) {
	    (void) err_punt_msg( errnum, funcnum, funcname, buf );
	    return;
	}
    } else
	rewind (errmsgfile);	/* start search at start of file */

    /* 
     * look for function name.
     */
    if (err_lookup_string (funcmsgfile, funcnum, funcbuf, MSG_BUF_SIZE)) {
	funcname = strchr (funcbuf, ':')+1;
	/* null out newline in function name string */
	msgnl = strrchr (funcname, '\n');
	if (msgnl)
	    *msgnl = '\0';
    }

    /* 
     * look for error message. 
     */
    if (err_lookup_string (errmsgfile, errnum, msgbuf, MSG_BUF_SIZE)) {
	msgtext = strchr (msgbuf, ':'); /* find delimiter */
	*msgtext = '\0'; 		/* end msgname string */
	++msgtext;			/* advance to message text */

	/* null out newline in message string */
	msgnl = strrchr (msgtext, '\n');
	if (msgnl)
	    *msgnl = '\0';

	/*
         * at last, format the message.
         */
	(void) sprintf (buf, err_msg_format, errnum, funcname, msgtext);
	err_add_nl (buf, 80);
    } else { 
	/* failed to find error message, use old format */
	(void) err_punt_msg( errnum, funcnum, funcname, buf );
    }
}

/* Special case certain errors, and do our best with others,
 * so the message can be printed without run-time files.
 */
static
int	/* TRUE if message is known; FALSE (and numbers formatted) otherwise */
err_punt_msg( errnum, funcnum, funcname, buf )
    int		errnum;		/* IN: error number */
    int		funcnum;	/* IN: function id */
    char	*funcname;	/* IN: function name string */
    char	*buf;		/* OUT: error message */
{
    char msgbuf [MSG_BUF_SIZE];
    char funcbuf [MSG_BUF_SIZE];
    int		known = TRUE;
    /* Could build a list of (msg number, msg pointer) pairs & search in loop */
    /* Further compact these fallback messages using FIXED %s escapes */
    static	char ignoring_function[] = "Ignoring function";
    static	char cannot_open_phigs[] = "cannot open PHIGS";
    static	char msg_for_ERRN51[] =
		    "%s, %s, cannot locate PEX API file \"phigsmon\"";
    static	char msg_for_ERRN54[] =
		    "%s, cannot locate PHIGS API support file";
    static	char msg_for_ERRN55[] =
		    "%s, %s, cannot open font files";
    static	char function_0[] = "OPEN PHIGS";

    if (funcname == (char*)NULL) {
	/* failed to find function name, use old format */
	funcname = funcbuf;
	(void) sprintf (funcbuf, "function number %d", funcnum);
    }

    /* Could separate finding function number from finding msg number in list */
    if (known = (funcnum == 0)) {  /* only 1 known function name at this time */
	switch (errnum) {
	case ERRN51:
	    (void) sprintf(msgbuf, err_msg_format, errnum, function_0,
				msg_for_ERRN51);
	    break;
	case ERRN54:
	    (void) sprintf(msgbuf, err_msg_format, errnum, function_0,
				msg_for_ERRN54);
	    break;
	case ERRN55:
	    (void) sprintf(msgbuf, err_msg_format, errnum, function_0,
				msg_for_ERRN55);
	    break;
	default:
	    known = FALSE;
	    /* Override input, possibly "function number 0" */
	    funcname = function_0;
	    break;
	}
    }
    if (known) {
	(void) sprintf (buf, msgbuf, ignoring_function, cannot_open_phigs);
	err_add_nl (buf, 80);
    } else
	(void) sprintf (buf, "PHIGS error %d in %s\n", errnum, funcname);
    return known;
}