add fbsize

fbsize/Makefile

@@ -0,0 +1,10 @@
+
+CFLAGS = -Wall -pedantic
+
+all: fbsize
+
+fbsize: main.o
+	cc -o $@ $^
+
+clean:
+	rm -f fbsize *.o

fbsize/main.c

@@ -0,0 +1,91 @@
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <linux/fb.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <getopt.h>
+
+#define VERSION "1.0"
+
+int main(int argc, char *argv[])
+{
+    int c;
+
+    while (1)
+    {
+        int option_index = 0;
+        static struct option long_options[] = {
+            {"resolution", required_argument, 0, 'r'},
+            {"buffer", required_argument, 0, 'b'},
+            {"offset", required_argument, 0, 'o'},
+            {"screen", required_argument, 0, 's'},
+            {"help", no_argument, 0, 'h'},
+            {0, 0, 0, 0}};
+
+        c = getopt_long(argc, argv, "r:b:o:s:h", long_options, &option_index);
+        if (c == -1)
+            break;
+
+        switch (c)
+        {
+        case 'r':
+        case 'b':
+        case 'o':
+        case 's':
+            int fbfd = 0;
+            struct fb_var_screeninfo var_info;
+
+            // 打开设备文件
+            fbfd = open(optarg, O_RDWR);
+            if (fbfd == -1)
+            {
+                perror("Error: cannot open framebuffer device");
+                return 1;
+            }
+
+            // 获取屏幕参数
+            if (ioctl(fbfd, FBIOGET_VSCREENINFO, &var_info) == -1)
+            {
+                perror("Error reading variable information");
+                return 1;
+            }
+
+            if (c == 'r')
+            {
+                printf("%dx%d\n", var_info.xres, var_info.yres);
+            }
+            else if (c == 'b')
+            {
+                printf("%dx%d\n", var_info.xres_virtual, var_info.yres_virtual);
+            }
+            else if (c == 'o')
+            {
+                printf("%dx%d\n", var_info.xoffset, var_info.yoffset);
+            }
+            else if (c == 's')
+            {
+                printf("%dx%d\n", var_info.height, var_info.width);
+            }
+
+            // 关闭设备文件
+            close(fbfd);
+            break;
+        case 'h':
+        case '?':
+            printf("Usage: %s [options] <framebuffer_device>\n", argv[0]);
+            printf("Version: %s\n", VERSION);
+            printf("Options:\n");
+            printf("  -r, --resolution   Display the resolution of the screen\n");
+            printf("  -b, --buffer       Display the resolution of the framebuffer\n");
+            printf("  -o, --offset       Display the offset of the screen\n");
+            printf("  -s, --screen       Display the size of the screen\n");
+            printf("  -h, --help         Display this help message\n");
+            return 0;
+        default:
+            return 1;
+        }
+    }
+
+    return 0;
+}