Archipelago » qemu

/*

 * Error reporting

 *

 * Copyright (C) 2010 Red Hat Inc.

 *

 * Authors:

 *  Markus Armbruster <armbru@redhat.com>,

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or later.

 * See the COPYING file in the top-level directory.

 */

#include <stdio.h>

#include "monitor.h"

/*

 * Print to current monitor if we have one, else to stderr.

 * TODO should return int, so callers can calculate width, but that

 * requires surgery to monitor_vprintf().  Left for another day.

 */

void error_vprintf(const char *fmt, va_list ap)

{

    if (cur_mon) {

        monitor_vprintf(cur_mon, fmt, ap);

    } else {

        vfprintf(stderr, fmt, ap);

    }

}

/*

 * Print to current monitor if we have one, else to stderr.

 * TODO just like error_vprintf()

 */

void error_printf(const char *fmt, ...)

{

    va_list ap;

    va_start(ap, fmt);

    error_vprintf(fmt, ap);

    va_end(ap);

}

void error_printf_unless_qmp(const char *fmt, ...)

{

    va_list ap;

    if (!monitor_cur_is_qmp()) {

        va_start(ap, fmt);

        error_vprintf(fmt, ap);

        va_end(ap);

    }

}

static Location std_loc = {

    .kind = LOC_NONE

};

static Location *cur_loc = &std_loc;

/*

 * Push location saved in LOC onto the location stack, return it.

 * The top of that stack is the current location.

 * Needs a matching loc_pop().

 */

Location *loc_push_restore(Location *loc)

{

    assert(!loc->prev);

    loc->prev = cur_loc;

    cur_loc = loc;

    return loc;

}

/*

 * Initialize *LOC to "nowhere", push it onto the location stack.

 * The top of that stack is the current location.

 * Needs a matching loc_pop().

 * Return LOC.

 */

Location *loc_push_none(Location *loc)

{

    loc->kind = LOC_NONE;

    loc->prev = NULL;

    return loc_push_restore(loc);

}

/*

 * Pop the location stack.

 * LOC must be the current location, i.e. the top of the stack.

 */

Location *loc_pop(Location *loc)

{

    assert(cur_loc == loc && loc->prev);

    cur_loc = loc->prev;

    loc->prev = NULL;

    return loc;

}

/*

 * Save the current location in LOC, return LOC.

 */

Location *loc_save(Location *loc)

{

    *loc = *cur_loc;

    loc->prev = NULL;

    return loc;

}

/*

 * Change the current location to the one saved in LOC.

 */

void loc_restore(Location *loc)

{

    Location *prev = cur_loc->prev;

    assert(!loc->prev);

    *cur_loc = *loc;

    cur_loc->prev = prev;

}

/*

 * Change the current location to "nowhere in particular".

 */

void loc_set_none(void)

{

    cur_loc->kind = LOC_NONE;

}

/*

 * Change the current location to argument ARGV[IDX..IDX+CNT-1].

 */

void loc_set_cmdline(char **argv, int idx, int cnt)

{

    cur_loc->kind = LOC_CMDLINE;

    cur_loc->num = cnt;

    cur_loc->ptr = argv + idx;

}

/*

 * Change the current location to file FNAME, line LNO.

 */

void loc_set_file(const char *fname, int lno)

{

    assert (fname || cur_loc->kind == LOC_FILE);

    cur_loc->kind = LOC_FILE;

    cur_loc->num = lno;

    if (fname) {

        cur_loc->ptr = fname;

    }

}

static const char *progname;

/*

 * Set the program name for error_print_loc().

 */

void error_set_progname(const char *argv0)

{

    const char *p = strrchr(argv0, '/');

    progname = p ? p + 1 : argv0;

}

/*

 * Print current location to current monitor if we have one, else to stderr.

 */

void error_print_loc(void)

{

    const char *sep = "";

    int i;

    const char *const *argp;

    if (!cur_mon && progname) {

        fprintf(stderr, "%s:", progname);

        sep = " ";

    }

    switch (cur_loc->kind) {

    case LOC_CMDLINE:

        argp = cur_loc->ptr;

        for (i = 0; i < cur_loc->num; i++) {

            error_printf("%s%s", sep, argp[i]);

            sep = " ";

        }

        error_printf(": ");

        break;

    case LOC_FILE:

        error_printf("%s:", (const char *)cur_loc->ptr);

        if (cur_loc->num) {

            error_printf("%d:", cur_loc->num);

        }

        error_printf(" ");

        break;

    default:

        error_printf("%s", sep);

    }

}

/*

 * Print an error message to current monitor if we have one, else to stderr.

 * Format arguments like sprintf().  The result should not contain

 * newlines.

 * Prepend the current location and append a newline.

 * It's wrong to call this in a QMP monitor.  Use qerror_report() there.

 */

void error_report(const char *fmt, ...)

{

    va_list ap;

    error_print_loc();

    va_start(ap, fmt);

    error_vprintf(fmt, ap);

    va_end(ap);

    error_printf("\n");

}