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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#define ARRAY_SIZE(arr) (sizeof(arr)/sizeof(*arr))
int main(void)
{
struct {
off_t offset;
int whence;
} tests[] = {
{ 0x00, SEEK_SET },
{ 0x01, SEEK_SET },
{ 0xFF, SEEK_SET }
};
char buf[2000];
off_t ret;
int i, fd;
FILE *fp;
int tmp;
fd = open("lseek.out", O_RDWR|O_CREAT, 0600);
if (fd == -1) {
perror("open(lseek.out) failed");
return 1;
}
unlink("lseek.out");
fp = fdopen(fd, "rw");
if (fp == NULL) {
perror("fopen(lseek.out) failed");
return 1;
}
memset(buf, 0xAB, sizeof(buf));
ret = write(fd, buf, sizeof(buf));
if (ret != sizeof(buf)) {
fprintf(stderr, "write() failed to write %zi bytes (wrote %li): ", sizeof(buf), (long)ret);
perror("");
return 1;
}
tmp = fseeko(fp, 1024, SEEK_SET);
assert(tmp == 0);
tmp = fseeko(fp, (off_t)-16, SEEK_CUR);
assert(tmp == 0);
ret = ftell(fp);
if (ret != (1024-16)) {
fprintf(stderr, "ftell() failed, we wanted pos %i but got %li: ", (1024-16), (long)ret);
perror("");
return 1;
}
for (i = 0; i < ARRAY_SIZE(tests); ++i) {
ret = lseek(fd, tests[i].offset, tests[i].whence);
if (ret != tests[i].offset) {
fprintf(stderr, "lseek(%li,%i) failed (wanted %li, got %li): ", (long)tests[i].offset,
tests[i].whence, (long)tests[i].offset, (long)ret);
perror("");
return 1;
}
ret = fseek(fp, tests[i].offset, tests[i].whence);
if (ret != 0) {
fprintf(stderr, "fseek(%li,%i) failed (wanted 0, got %li): ", (long)tests[i].offset,
tests[i].whence, (long)ret);
perror("");
return 1;
}
}
fclose(fp);
close(fd);
printf("Success!\n");
return 0;
}
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