Fix chdir/fchdir for setuid/setgid binaries

[dragonfly.git] / usr.sbin / vidcontrol / vidcontrol.c

/*-
 * Copyright (c) 1994-1996 Søren Schmidt
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer,
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software withough specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD: src/usr.sbin/vidcontrol/vidcontrol.c,v 1.32.2.7 2002/09/15 22:31:50 dd Exp $
 * $DragonFly: src/usr.sbin/vidcontrol/vidcontrol.c,v 1.15 2008/11/02 21:52:46 swildner Exp $
 */

#include <machine/console.h>

#include <sys/consio.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <ctype.h>
#include <err.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "path.h"
#include "decode.h"


#define DATASIZE(x)     ((x).w * (x).h * 256 / 8)

#define DUMP_RAW        0
#define DUMP_TXT        1

#define DUMP_FMT_REV    1


char legal_colors[16][16] = {
        "black", "blue", "green", "cyan",
        "red", "magenta", "brown", "white",
        "grey", "lightblue", "lightgreen", "lightcyan",
        "lightred", "lightmagenta", "yellow", "lightwhite"
};

struct {
        int                     active_vty;
        vid_info_t              console_info;
        unsigned char           screen_map[256];
        int                     video_mode_number;
        struct video_info       video_mode_info;
} cur_info;

int hex = 0;
int number;
int vesa_cols;
int vesa_rows;
int font_height;
int colors_changed;
int video_mode_changed;
int normal_fore_color, normal_back_color;
int revers_fore_color, revers_back_color;
char letter;
struct vid_info info;
struct video_info new_mode_info;


/*
 * Initialize revert data.
 *
 * NOTE: the following parameters are not yet saved/restored:
 *
 *   screen saver timeout
 *   cursor type
 *   mouse character and mouse show/hide state
 *   vty switching on/off state
 *   history buffer size
 *   history contents
 *   font maps
 */

static void
init(void)
{
        if (ioctl(0, VT_GETACTIVE, &cur_info.active_vty) == -1)
                errc(1, errno, "getting active vty");

        cur_info.console_info.size = sizeof(cur_info.console_info);

        if (ioctl(0, CONS_GETINFO, &cur_info.console_info) == -1)
                errc(1, errno, "getting console information");

        if (ioctl(0, GIO_SCRNMAP, &cur_info.screen_map) == -1)
                errc(1, errno, "getting screen map");

        if (ioctl(0, CONS_GET, &cur_info.video_mode_number) == -1)
                errc(1, errno, "getting video mode number");

        cur_info.video_mode_info.vi_mode = cur_info.video_mode_number;

        if (ioctl(0, CONS_MODEINFO, &cur_info.video_mode_info) == -1)
                errc(1, errno, "getting video mode parameters");

        normal_fore_color = cur_info.console_info.mv_norm.fore;
        normal_back_color = cur_info.console_info.mv_norm.back;
        revers_fore_color = cur_info.console_info.mv_rev.fore;
        revers_back_color = cur_info.console_info.mv_rev.back;
}


/*
 * If something goes wrong along the way we call revert() to go back to the
 * console state we came from (which is assumed to be working).
 *
 * NOTE: please also read the comments of init().
 */

static void
revert(void)
{
        int size[3];

        ioctl(0, VT_ACTIVATE, (caddr_t) (long) cur_info.active_vty);

        fprintf(stderr, "\e[=%dA", cur_info.console_info.mv_ovscan);
        fprintf(stderr, "\e[=%dF", cur_info.console_info.mv_norm.fore);
        fprintf(stderr, "\e[=%dG", cur_info.console_info.mv_norm.back);
        fprintf(stderr, "\e[=%dH", cur_info.console_info.mv_rev.fore);
        fprintf(stderr, "\e[=%dI", cur_info.console_info.mv_rev.back);

        ioctl(0, PIO_SCRNMAP, &cur_info.screen_map);
        ioctl(0, CONS_SET, &cur_info.video_mode_number);

        if (cur_info.video_mode_info.vi_flags & V_INFO_GRAPHICS) {
                size[0] = cur_info.video_mode_info.vi_width / 8;
                size[1] = cur_info.video_mode_info.vi_height /
                          cur_info.console_info.font_size;
                size[2] = cur_info.console_info.font_size;

                ioctl(0, KDRASTER, size);
        }
}


/*
 * Print a short usage string describing all options, then exit.
 */

static void
usage(void)
{
        fprintf(stderr,
                "usage: vidcontrol [-CdLPpx] [-b color] [-c appearance]"
                " [-f [size] file]\n"
                "                  [-g geometry] [-h size] [-i adapter | mode]"
                " [-l screen_map]\n"
                "                  [-M char] [-m on | off] [-r foreground"
                " background]\n"
                "                  [-S on | off] [-s number] [-t N | off]"
                " [mode]\n"
                "                  [foreground [background]] [show]\n");

        exit(1);
}


/*
 * Retrieve the next argument from the command line (for options that require
 * more than one argument).
 */

static char *
nextarg(int ac, char **av, int *indp, int oc, int strict)
{
        if (*indp < ac)
                return(av[(*indp)++]);

        if (strict != 0) {
                revert();
                errx(1, "option requires two arguments -- %c", oc);
        }

        return(NULL);
}


/*
 * Guess which file to open. Try to open each combination of a specified set
 * of file name components.
 */

static FILE *
openguess(const char *a[], const char *b[], const char *c[], const char *d[], char **name)
{
        FILE *f;
        int i, j, k, l;

        for (i = 0; a[i] != NULL; i++) {
                for (j = 0; b[j] != NULL; j++) {
                        for (k = 0; c[k] != NULL; k++) {
                                for (l = 0; d[l] != NULL; l++) {
                                        asprintf(name, "%s%s%s%s",
                                                 a[i], b[j], c[k], d[l]);

                                        f = fopen(*name, "r");

                                        if (f != NULL)
                                                return (f);

                                        free(*name);
                                }
                        }
                }
        }

        return (NULL);
}


/*
 * Load a screenmap from a file and set it.
 */

static void
load_scrnmap(char *filename)
{
        FILE *fd;
        int size;
        char *name;
        scrmap_t scrnmap;
        const char *a[] = {"", SCRNMAP_PATH, NULL};
        const char *b[] = {filename, NULL};
        const char *c[] = {"", ".scm", NULL};
        const char *d[] = {"", NULL};

        fd = openguess(a, b, c, d, &name);

        if (fd == NULL) {
                revert();
                errx(1, "screenmap file not found");
        }

        size = sizeof(scrnmap);

        if (decode(fd, (char *)&scrnmap, size) != size) {
                rewind(fd);

                if (fread(&scrnmap, 1, size, fd) != (size_t)size) {
                        fclose(fd);
                        revert();
                        errx(1, "bad screenmap file");
                }
        }

        if (ioctl(0, PIO_SCRNMAP, &scrnmap) == -1) {
                revert();
                errc(1, errno, "loading screenmap");
        }

        fclose(fd);
}


/*
 * Set the default screenmap.
 */

static void
load_default_scrnmap(void)
{
        scrmap_t scrnmap;
        int i;

        for (i = 0; i < 256; i++)
                *((char*)&scrnmap + i) = i;

        if (ioctl(0, PIO_SCRNMAP, &scrnmap) == -1) {
                revert();
                errc(1, errno, "loading default screenmap");
        }
}


/*
 * Print the current screenmap to stdout.
 */

static void
print_scrnmap(void)
{
        unsigned char map[256];
        size_t i;

        if (ioctl(0, GIO_SCRNMAP, &map) == -1) {
                revert();
                errc(1, errno, "getting screenmap");
        }

        for (i=0; i<sizeof(map); i++) {
                if (i > 0 && i % 16 == 0)
                        fprintf(stdout, "\n");

                if (hex != 0)
                        fprintf(stdout, " %02x", map[i]);
                else
                        fprintf(stdout, " %03d", map[i]);
        }

        fprintf(stdout, "\n");
}


/*
 * Determine a file's size.
 */

static int
fsize(FILE *file)
{
        struct stat sb;

        if (fstat(fileno(file), &sb) == 0)
                return sb.st_size;
        else
                return -1;
}


/*
 * Load a font from file and set it.
 */

static void
load_font(char *type, char *filename)
{
        FILE *fd;
        int h, i, size, w;
        unsigned long io = 0;   /* silence stupid gcc(1) in the Wall mode */
        char *name, *fontmap, size_sufx[6];
        const char *a[] = {"", FONT_PATH, NULL};
        const char *b[] = {filename, NULL};
        const char *c[] = {"", size_sufx, NULL};
        const char *d[] = {"", ".fnt", NULL};
        vid_info_t vinfo;

        struct sizeinfo {
                int w;
                int h;
                unsigned long io;
        } sizes[] = {{8, 16, PIO_FONT8x16},
                     {8, 14, PIO_FONT8x14},
                     {8,  8, PIO_FONT8x8},
                     {0,  0, 0}};

        vinfo.size = sizeof(vinfo);

        if (ioctl(0, CONS_GETINFO, &vinfo) == -1) {
                revert();
                errc(1, errno, "obtaining current video mode parameters");
        }

        snprintf(size_sufx, sizeof(size_sufx), "-8x%d", vinfo.font_size);

        fd = openguess(a, b, c, d, &name);

        if (fd == NULL) {
                revert();
                errx(1, "%s: can't load font file", filename);
        }

        if (type != NULL) {
                size = 0;
                if (sscanf(type, "%dx%d", &w, &h) == 2) {
                        for (i = 0; sizes[i].w != 0; i++) {
                                if (sizes[i].w == w && sizes[i].h == h) {
                                        size = DATASIZE(sizes[i]);
                                        io = sizes[i].io;
                                        font_height = sizes[i].h;
                                }
                        }
                }
                if (size == 0) {
                        fclose(fd);
                        revert();
                        errx(1, "%s: bad font size specification", type);
                }
        } else {
                /* Apply heuristics */

                int j;
                int dsize[2];

                size = DATASIZE(sizes[0]);
                fontmap = (char*) malloc(size);
                dsize[0] = decode(fd, fontmap, size);
                dsize[1] = fsize(fd);
                free(fontmap);

                size = 0;
                for (j = 0; j < 2; j++) {
                        for (i = 0; sizes[i].w != 0; i++) {
                                if (DATASIZE(sizes[i]) == dsize[j]) {
                                        size = dsize[j];
                                        io = sizes[i].io;
                                        font_height = sizes[i].h;
                                        j = 2;  /* XXX */
                                        break;
                                }
                        }
                }

                if (size == 0) {
                        fclose(fd);
                        revert();
                        errx(1, "%s: can't guess font size", filename);
                }

                rewind(fd);
        }

        fontmap = (char*) malloc(size);

        if (decode(fd, fontmap, size) != size) {
                rewind(fd);
                if (fsize(fd) != size ||
                    fread(fontmap, 1, size, fd) != (size_t)size) {
                        fclose(fd);
                        free(fontmap);
                        revert();
                        errx(1, "%s: bad font file", filename);
                }
        }

        if (ioctl(0, io, fontmap) == -1) {
                revert();
                errc(1, errno, "loading font");
        }

        fclose(fd);
        free(fontmap);
}


/*
 * Set the timeout for the screensaver.
 */

static void
set_screensaver_timeout(char *arg)
{
        int nsec;

        if (!strcmp(arg, "off")) {
                nsec = 0;
        } else {
                nsec = atoi(arg);

                if ((*arg == '\0') || (nsec < 1)) {
                        revert();
                        errx(1, "argument must be a positive number");
                }
        }

        if (ioctl(0, CONS_BLANKTIME, &nsec) == -1) {
                revert();
                errc(1, errno, "setting screensaver period");
        }
}


/*
 * Set the cursor's shape/type.
 */

static void
set_cursor_type(char *appearance)
{
        int type;

        if (!strcmp(appearance, "normal"))
                type = 0;
        else if (!strcmp(appearance, "blink"))
                type = 1;
        else if (!strcmp(appearance, "destructive"))
                type = 3;
        else {
                revert();
                errx(1, "argument to -c must be normal, blink or destructive");
        }

        if (ioctl(0, CONS_CURSORTYPE, &type) == -1) {
                revert();
                errc(1, errno, "setting cursor type");
        }
}


/*
 * Set the video mode.
 */

static void
video_mode(int argc, char **argv, int *mode_index)
{
        static struct {
                const char *name;
                unsigned long mode_num;
        } modes[] = {{ "80x25",         M_VGA_C80x25 },
                     { "80x30",         M_VGA_C80x30 },
                     { "80x43",         M_ENH_C80x43 },
                     { "80x50",         M_VGA_C80x50 },
                     { "80x60",         M_VGA_C80x60 },
                     { "132x25",        M_VESA_C132x25 },
                     { "132x43",        M_VESA_C132x43 },
                     { "132x50",        M_VESA_C132x50 },
                     { "132x60",        M_VESA_C132x60 },
                     { "VGA_40x25",     M_VGA_C40x25 },
                     { "VGA_80x25",     M_VGA_C80x25 },
                     { "VGA_80x30",     M_VGA_C80x30 },
                     { "VGA_80x50",     M_VGA_C80x50 },
                     { "VGA_80x60",     M_VGA_C80x60 },
#ifdef SW_VGA_C90x25
                     { "VGA_90x25",     M_VGA_C90x25 },
                     { "VGA_90x30",     M_VGA_C90x30 },
                     { "VGA_90x43",     M_VGA_C90x43 },
                     { "VGA_90x50",     M_VGA_C90x50 },
                     { "VGA_90x60",     M_VGA_C90x60 },
#endif
                     { "VGA_320x200",   M_CG320 },
                     { "EGA_80x25",     M_ENH_C80x25 },
                     { "EGA_80x43",     M_ENH_C80x43 },
                     { "VESA_132x25",   M_VESA_C132x25 },
                     { "VESA_132x43",   M_VESA_C132x43 },
                     { "VESA_132x50",   M_VESA_C132x50 },
                     { "VESA_132x60",   M_VESA_C132x60 },
                     { "VESA_800x600",  M_VESA_800x600 },
                     { NULL, 0 },
        };

        int new_mode_num = 0;
        int size[3];
        int i;

        /*
         * Parse the video mode argument...
         */

        if (*mode_index < argc) {
                if (!strncmp(argv[*mode_index], "MODE_", 5)) {
                        if (!isdigit(argv[*mode_index][5]))
                                errx(1, "invalid video mode number");

                        new_mode_num = atoi(&argv[*mode_index][5]);
                } else {
                        for (i = 0; modes[i].name != NULL; ++i) {
                                if (!strcmp(argv[*mode_index], modes[i].name)) {
                                        new_mode_num = modes[i].mode_num;
                                        break;
                                }
                        }

                        if (modes[i].name == NULL)
                                errx(1, "invalid video mode name");
                }

                /*
                 * Collect enough information about the new video mode...
                 */

                new_mode_info.vi_mode = new_mode_num;

                if (ioctl(0, CONS_MODEINFO, &new_mode_info) == -1) {
                        revert();
                        errc(1, errno, "obtaining new video mode parameters");
                }

                /*
                 * Try setting the new mode.
                 */

                if (ioctl(0, CONS_SET, &new_mode_num) == -1) {
                        revert();
                        errc(1, errno, "setting video mode");
                }

                /*
                 * For raster modes it's not enough to just set the mode.
                 * We also need to explicitly set the raster mode.
                 */

                if (new_mode_info.vi_flags & V_INFO_GRAPHICS) {
                        /* font size */

                        if (font_height == 0)
                                font_height = cur_info.console_info.font_size;

                        size[2] = font_height;

                        /* adjust columns */

                        if ((vesa_cols * 8 > new_mode_info.vi_width) ||
                            (vesa_cols <= 0)) {
                                size[0] = new_mode_info.vi_width / 8;
                        } else {
                                size[0] = vesa_cols;
                        }

                        /* adjust rows */

                        if ((vesa_rows * font_height > new_mode_info.vi_height) ||
                            (vesa_rows <= 0)) {
                                size[1] = new_mode_info.vi_height /
                                          font_height;
                        } else {
                                size[1] = vesa_rows;
                        }

                        /* set raster mode */

                        if (ioctl(0, KDRASTER, size)) {
                                revert();
                                errc(1, errno, "activating raster display");
                        }
                }

                video_mode_changed = 1;

                (*mode_index)++;
        }
}


/*
 * Return the number for a specified color name.
 */

static int
get_color_number(char *color)
{
        int i;

        for (i=0; i<16; i++) {
                if (!strcmp(color, legal_colors[i]))
                        return i;
        }
        return -1;
}


/*
 * Get normal text and background colors.
 */

static void
get_normal_colors(int argc, char **argv, int *color_index)
{
        int color;

        if (*color_index < argc &&
            (color = get_color_number(argv[*color_index])) != -1) {
                (*color_index)++;
                normal_fore_color = color;
                colors_changed = 1;
        
                if (*color_index < argc &&
                    (color = get_color_number(argv[*color_index])) != -1) {
                        (*color_index)++;
                        normal_back_color = color;            
                }
        }
}


/*
 * Get reverse text and background colors.
 */

static void
get_reverse_colors(int argc, char **argv, int *color_index)
{
        int color;

        if ((color = get_color_number(argv[*(color_index)-1])) != -1) {
                revers_fore_color = color;
                colors_changed = 1;

                if (*color_index < argc &&
                    (color = get_color_number(argv[*color_index])) != -1) {
                        (*color_index)++;
                        revers_back_color = color;            
                }
        }
}


/*
 * Set normal and reverse foreground and background colors.
 */

static void
set_colors(void)
{
        fprintf(stderr, "\e[=%dF", normal_fore_color);
        fprintf(stderr, "\e[=%dG", normal_back_color);
        fprintf(stderr, "\e[=%dH", revers_fore_color);
        fprintf(stderr, "\e[=%dI", revers_back_color);
}


/*
 * Switch to virtual terminal #arg.
 */

static void
set_console(char *arg)
{
        int n;

        if(!arg || strspn(arg,"0123456789") != strlen(arg)) {
                revert();
                errx(1, "bad console number");
        }

        n = atoi(arg);

        if (n < 1 || n > 16) {
                revert();
                errx(1, "console number out of range");
        } else if (ioctl(0, VT_ACTIVATE, (caddr_t) (long) n) == -1) {
                revert();
                errc(1, errno, "switching vty");
        }
}


/*
 * Sets the border color.
 */

static void
set_border_color(char *arg)
{
        int color;

        if ((color = get_color_number(arg)) != -1)
                fprintf(stderr, "\e[=%dA", color);
        else
                usage();
}


static void
set_mouse_char(char *arg)
{
        struct mouse_info mouse;
        long l;

        l = strtol(arg, NULL, 0);

        if ((l < 0) || (l > UCHAR_MAX)) {
                revert();
                errx(1, "argument to -M must be 0 through %d", UCHAR_MAX);
        }

        mouse.operation = MOUSE_MOUSECHAR;
        mouse.u.mouse_char = (int)l;

        if (ioctl(0, CONS_MOUSECTL, &mouse) == -1) {
                revert();
                errc(1, errno, "setting mouse character");
        }
}


/*
 * Show/hide the mouse.
 */

static void
set_mouse(char *arg)
{
        struct mouse_info mouse;

        if (!strcmp(arg, "on")) {
                mouse.operation = MOUSE_SHOW;
        } else if (!strcmp(arg, "off")) {
                mouse.operation = MOUSE_HIDE;
        } else {
                revert();
                errx(1, "argument to -m must be either on or off");
        }
        ioctl(0, CONS_MOUSECTL, &mouse);
}


static void
set_lockswitch(char *arg)
{
        int data;

        if (!strcmp(arg, "off")) {
                data = 0x01;
        } else if (!strcmp(arg, "on")) {
                data = 0x02;
        } else {
                revert();
                errx(1, "argument to -S must be either on or off");
        }

        if (ioctl(0, VT_LOCKSWITCH, &data) == -1) {
                revert();
                errc(1, errno, "turning %s vty switching",
                     data == 0x01 ? "off" : "on");
        }
}


/*
 * Return the adapter name for a specified type.
 */

static const char *
adapter_name(int type)
{
        static struct {
                int type;
                const char *name;
        } names[] = {{ KD_MONO,     "MDA" },
                     { KD_HERCULES, "Hercules" },
                     { KD_CGA,      "CGA" },
                     { KD_EGA,      "EGA" },
                     { KD_VGA,      "VGA" },
                     { KD_TGA,      "TGA" },
                     { -1,          "Unknown" },
        };

        int i;

        for (i = 0; names[i].type != -1; ++i) {
                if (names[i].type == type)
                        break;
        }

        return names[i].name;
}


/*
 * Show graphics adapter information.
 */

static void
show_adapter_info(void)
{
        struct video_adapter_info ad;

        ad.va_index = 0;

        if (ioctl(0, CONS_ADPINFO, &ad) == -1) {
                revert();
                errc(1, errno, "obtaining adapter information");
        }

        printf("fb%d:\n", ad.va_index);
        printf("    %.*s%d, type:%s%s (%d), flags:0x%x\n",
               (int)sizeof(ad.va_name), ad.va_name, ad.va_unit,
               (ad.va_flags & V_ADP_VESA) ? "VESA " : "",
               adapter_name(ad.va_type), ad.va_type, ad.va_flags);
        printf("    initial mode:%d, current mode:%d, BIOS mode:%d\n",
               ad.va_initial_mode, ad.va_mode, ad.va_initial_bios_mode);
        printf("    frame buffer window:0x%x, buffer size:0x%zx\n",
               ad.va_window, ad.va_buffer_size);
        printf("    window size:0x%zx, origin:0x%x\n",
               ad.va_window_size, ad.va_window_orig);
        printf("    display start address (%d, %d), scan line width:%d\n",
               ad.va_disp_start.x, ad.va_disp_start.y, ad.va_line_width);
        printf("    reserved:0x%x\n", ad.va_unused0);
}


/*
 * Show video mode information.
 */

static void
show_mode_info(void)
{
        struct video_info vinfo;
        char buf[80];
        int mode;
        int c;

        printf("    mode#     flags   type    size       "
               "font      window      linear buffer\n");
        printf("---------------------------------------"
               "---------------------------------------\n");

        for (mode = 0; mode < M_VESA_MODE_MAX; ++mode) {
                vinfo.vi_mode = mode;

                if (ioctl(0, CONS_MODEINFO, &vinfo))
                        continue;
                if (vinfo.vi_mode != mode)
                        continue;

                printf("%3d (0x%03x)", mode, mode);
                printf(" 0x%08x", vinfo.vi_flags);

                if (vinfo.vi_flags & V_INFO_GRAPHICS) {
                        c = 'G';

                        snprintf(buf, sizeof(buf), "%dx%dx%d %d",
                                 vinfo.vi_width, vinfo.vi_height,
                                 vinfo.vi_depth, vinfo.vi_planes);
                } else {
                        c = 'T';

                        snprintf(buf, sizeof(buf), "%dx%d",
                                 vinfo.vi_width, vinfo.vi_height);
                }

                printf(" %c %-15s", c, buf);
                snprintf(buf, sizeof(buf), "%dx%d",
                         vinfo.vi_cwidth, vinfo.vi_cheight);
                printf(" %-5s", buf);
                printf(" 0x%05x %2dk %2dk",
                       vinfo.vi_window, (int)vinfo.vi_window_size / 1024,
                       (int)vinfo.vi_window_gran/1024);
                printf(" 0x%08x %dk\n",
                       vinfo.vi_buffer, (int)vinfo.vi_buffer_size / 1024);
        }
}


static void
show_info(char *arg)
{
        if (!strcmp(arg, "adapter")) {
                show_adapter_info();
        } else if (!strcmp(arg, "mode")) {
                show_mode_info();
        } else {
                revert();
                errx(1, "argument to -i must be either adapter or mode");
        }
}


static void
test_frame(void)
{
        int i;

        fprintf(stdout, "\e[=0G\n\n");

        for (i = 0; i < 8; i++) {
                fprintf(stdout, "\e[=15F\e[=0G        %2d \e[=%dF%-16s"
                        "\e[=15F\e[=0G        %2d \e[=%dF%-16s        "
                        "\e[=15F %2d \e[=%dGBACKGROUND\e[=0G\n",
                        i, i, legal_colors[i], i+8, i+8,
                        legal_colors[i+8], i, i);
        }

        fprintf(stdout, "\e[=%dF\e[=%dG\e[=%dH\e[=%dI\n",
                info.mv_norm.fore, info.mv_norm.back,
                info.mv_rev.fore, info.mv_rev.back);
}


/*
 * Snapshot the video memory of that terminal, using the CONS_SCRSHOT
 * ioctl, and writes the results to stdout either in the special
 * binary format (see manual page for details), or in the plain
 * text format.
 */

static void
dump_screen(int mode)
{
        scrshot_t shot;
        vid_info_t vinfo;

        vinfo.size = sizeof(vinfo);

        if (ioctl(0, CONS_GETINFO, &vinfo) == -1) {
                revert();
                errc(1, errno, "obtaining current video mode parameters");
        }

        shot.buf = alloca(vinfo.mv_csz * vinfo.mv_rsz * sizeof(u_int16_t));

        if (shot.buf == NULL) {
                revert();
                errx(1, "failed to allocate memory for dump");
        }

        shot.xsize = vinfo.mv_csz;
        shot.ysize = vinfo.mv_rsz;

        if (ioctl(0, CONS_SCRSHOT, &shot) == -1) {
                revert();
                errc(1, errno, "dumping screen");
        }

        if (mode == DUMP_RAW) {
                printf("SCRSHOT_%c%c%c%c", DUMP_FMT_REV, 2,
                       shot.xsize, shot.ysize);

                fflush(stdout);

                write(STDOUT_FILENO, shot.buf,
                      shot.xsize * shot.ysize * sizeof(u_int16_t));
        } else {
                char *line;
                int x, y;
                u_int16_t ch;

                line = alloca(shot.xsize + 1);

                if (line == NULL) {
                        revert();
                        errx(1, "failed to allocate memory for line buffer");
                }

                for (y = 0; y < shot.ysize; y++) {
                        for (x = 0; x < shot.xsize; x++) {
                                ch = shot.buf[x + (y * shot.xsize)];
                                ch &= 0xff;

                                if (isprint(ch) == 0)
                                        ch = ' ';

                                line[x] = (char)ch;
                        }

                        /* Trim trailing spaces */

                        do {
                                line[x--] = '\0';
                        } while (line[x] == ' ' && x != 0);

                        puts(line);
                }

                fflush(stdout);
        }
}


/*
 * Set the console history buffer size.
 */

static void
set_history(char *opt)
{
        int size;

        size = atoi(opt);

        if ((*opt == '\0') || size < 0) {
                revert();
                errx(1, "argument must be a positive number");
        }

        if (ioctl(0, CONS_HISTORY, &size) == -1) {
                revert();
                errc(1, errno, "setting history buffer size");
        }
}


/*
 * Clear the console history buffer.
 */

static void
clear_history(void)
{
        if (ioctl(0, CONS_CLRHIST) == -1) {
                revert();
                errc(1, errno, "clearing history buffer");
        }
}


int
main(int argc, char **argv)
{
        char *font, *type;
        int opt;

        if (argc == 1)
                usage();

        init();

        info.size = sizeof(info);

        if (ioctl(0, CONS_GETINFO, &info) == -1)
                err(1, "must be on a virtual console");

        while((opt = getopt(argc, argv, "b:Cc:df:g:h:i:l:LM:m:pPr:S:s:t:x")) != -1) {
                switch(opt) {
                case 'b':
                        set_border_color(optarg);
                        break;
                case 'C':
                        clear_history();
                        break;
                case 'c':
                        set_cursor_type(optarg);
                        break;
                case 'd':
                        print_scrnmap();
                        break;
                case 'f':
                        type = optarg;
                        font = nextarg(argc, argv, &optind, 'f', 0);

                        if (font == NULL) {
                                type = NULL;
                                font = optarg;
                        }

                        load_font(type, font);
                        break;
                case 'g':
                        if (sscanf(optarg, "%dx%d",
                            &vesa_cols, &vesa_rows) != 2) {
                                revert();
                                warnx("incorrect geometry: %s", optarg);
                                usage();
                        }
                        break;
                case 'h':
                        set_history(optarg);
                        break;
                case 'i':
                        show_info(optarg);
                        break;
                case 'l':
                        load_scrnmap(optarg);
                        break;
                case 'L':
                        load_default_scrnmap();
                        break;
                case 'M':
                        set_mouse_char(optarg);
                        break;
                case 'm':
                        set_mouse(optarg);
                        break;
                case 'p':
                        dump_screen(DUMP_RAW);
                        break;
                case 'P':
                        dump_screen(DUMP_TXT);
                        break;
                case 'r':
                        get_reverse_colors(argc, argv, &optind);
                        break;
                case 'S':
                        set_lockswitch(optarg);
                        break;
                case 's':
                        set_console(optarg);
                        break;
                case 't':
                        set_screensaver_timeout(optarg);
                        break;
                case 'x':
                        hex = 1;
                        break;
                default:
                        usage();
                }
        }

        if (optind < argc && !strcmp(argv[optind], "show")) {
                test_frame();
                optind++;
        }

        video_mode(argc, argv, &optind);

        get_normal_colors(argc, argv, &optind);

        if (colors_changed || video_mode_changed) {
                if (!(new_mode_info.vi_flags & V_INFO_GRAPHICS)) {
                        if ((normal_back_color < 8) && (revers_back_color < 8)) {
                                set_colors();
                        } else {
                                revert();
                                errx(1, "bg color for text modes must be < 8");
                        }
                } else {
                        set_colors();
                }
        }

        if ((optind != argc) || (argc == 1))
                usage();

        return 0;
}