MeowOS Dev
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35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
/* fbpan — set /dev/fb0 yoffset (pan) to argv[1] and print the result. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <stdint.h>
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#define GETV 0x4600
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#define PAN 0x4606
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int main(int argc, char **argv) {
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int fd = open("/dev/fb0", O_RDWR);
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if (fd < 0) { perror("open"); return 1; }
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unsigned char v[160]; memset(v,0,sizeof v);
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if (ioctl(fd, GETV, v) < 0) { perror("getvar"); return 1; }
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uint32_t orig = *(uint32_t*)(v+20);
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uint32_t yres = *(uint32_t*)(v+4);
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uint32_t target = argc > 1 ? (uint32_t)atoi(argv[1]) : 0;
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if (yres) target = (target / yres) * yres; /* snap to whole-screen offset */
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*(uint32_t*)(v+16) = 0;
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*(uint32_t*)(v+20) = target;
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errno = 0;
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int r = ioctl(fd, PAN, v);
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int e = errno;
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unsigned char w[160]; memset(w,0,sizeof w);
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ioctl(fd, GETV, w);
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printf("pan(%u): r=%d errno=%d(%s) yoffset %u -> %u (yres=%u)\n",
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target, r, e, strerror(e), orig, *(uint32_t*)(w+20), yres);
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close(fd);
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return 0;
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}
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