mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
#include <limits.h>
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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 <sys/stat.h>
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#include <unistd.h>
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#define SIZE ((size_t)2 * 1024 * 1024 * 1024 + 13)
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char path[PATH_MAX];
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void teardown(void) {
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unlink(path);
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}
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int setup(void) {
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int fd;
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struct stat st;
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const char *tmpdir;
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if (!stat("/dev/shm", &st))
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strlcpy(path, "/dev/shm", sizeof(path));
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else if ((tmpdir = getenv("TMPDIR")))
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strlcpy(path, tmpdir, sizeof(path));
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else
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strlcpy(path, "/tmp", sizeof(path));
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strlcat(path, "/fread3gb.XXXXXX", sizeof(path));
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if ((fd = mkstemp(path)) == -1)
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return 1;
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if (ftruncate(fd, SIZE))
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return 2;
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if (pwrite(fd, "a", 1, 0) != 1)
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return 3;
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if (pwrite(fd, "b", 1, 0x7fffefff) != 1)
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return 4;
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if (pwrite(fd, "c", 1, 0x7ffff000) != 1)
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return 5;
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if (pwrite(fd, "z", 1, SIZE - 1) != 1)
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return 6;
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if (close(fd))
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return 7;
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return 0;
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}
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int test(void) {
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FILE *f;
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char *buf;
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size_t rc;
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if (!(f = fopen(path, "r")))
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return 8;
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if (!(buf = malloc(SIZE)))
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return 9;
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if ((rc = fread(buf, SIZE, 1, f)) != 1)
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return 10;
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if (buf[0] != 'a')
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return 11;
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if (buf[0x7fffefff] != 'b')
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return 12;
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if (buf[0x7ffff000] != 'c')
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return 13;
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if (buf[SIZE - 1] != 'z')
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return 14;
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if (fclose(f))
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return 15;
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return 0;
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}
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int main(int argc, char *argv[]) {
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// makes testing fleet go too slow
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if (1)
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return 0;
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int rc;
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if ((rc = setup())) {
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perror(path);
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teardown();
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return rc;
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}
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rc = test();
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teardown();
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return rc;
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}
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