Source of fbset.c - busybox

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#include "busybox.h"
​
#define DEFAULTFBDEV  "/dev/fb0"
#define DEFAULTFBMODE "/etc/fb.modes"
​
static const int OPT_CHANGE   = (1 << 0);
static const int OPT_INFO     = (1 << 1);
static const int OPT_READMODE = (1 << 2);
​
enum {
    CMD_HELP = 0,
    CMD_FB = 1,
    CMD_DB = 2,
    CMD_GEOMETRY = 3,
    CMD_TIMING = 4,
    CMD_ACCEL = 5,
    CMD_HSYNC = 6,
    CMD_VSYNC = 7,
    CMD_LACED = 8,
    CMD_DOUBLE = 9,
/*  CMD_XCOMPAT =     10, */
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    __u32 reserved[6];      /* Reserved for future compatibility */
};
​
​
static struct cmdoptions_t {
    char *name;
    unsigned char param_count;
    unsigned char code;
} g_cmdoptions[] = {
    {
    "-h", 0, CMD_HELP}, {
    "-fb", 1, CMD_FB}, {
    "-db", 1, CMD_DB}, {
    "-a", 0, CMD_ALL}, {
    "-i", 0, CMD_INFO}, {
    "-g", 5, CMD_GEOMETRY}, {
    "-t", 7, CMD_TIMING}, {
    "-accel", 1, CMD_ACCEL}, {
    "-hsync", 1, CMD_HSYNC}, {
    "-vsync", 1, CMD_VSYNC}, {
    "-laced", 1, CMD_LACED}, {
    "-double", 1, CMD_DOUBLE}, {
    "-help", 0, CMD_HELP}, {
    "-n", 0, CMD_CHANGE}, {
#ifdef BB_FEATURE_FBSET_FANCY
    "-help", 0, CMD_HELP}, {
    "-all", 0, CMD_ALL}, {
    "-xres", 1, CMD_XRES}, {
    "-yres", 1, CMD_YRES}, {
    "-vxres", 1, CMD_VXRES}, {
    "-vyres", 1, CMD_VYRES}, {
    "-depth", 1, CMD_DEPTH}, {
    "-match", 0, CMD_MATCH}, {
    "-geometry", 5, CMD_GEOMETRY}, {
    "-pixclock", 1, CMD_PIXCLOCK}, {
    "-left", 1, CMD_LEFT}, {
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​
    /* parse cmd args.... why do they have to make things so difficult? */
    argv++;
    argc--;
    for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
        for (i = 0; g_cmdoptions[i].name; i++) {
            if (!strcmp(thisarg, g_cmdoptions[i].name)) {
                if (argc - 1 < g_cmdoptions[i].param_count)
                    show_usage();
                switch (g_cmdoptions[i].code) {
                case CMD_HELP:
                    show_usage();
                case CMD_FB:
                    fbdev = argv[1];
                    break;
                case CMD_DB:
                    modefile = argv[1];
                    break;
                case CMD_GEOMETRY:
                    varset.xres = strtoul(argv[1], 0, 0);
                    varset.yres = strtoul(argv[2], 0, 0);
                    varset.xres_virtual = strtoul(argv[3], 0, 0);