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Fix fread() with 2gb+ sizes

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Justine Tunney 2024-05-24 19:28:23 -07:00
parent 5f61d273e4
commit ed93fc3dd7
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GPG key ID: BE714B4575D6E328
8 changed files with 254 additions and 119 deletions
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36
libc/stdio/fwrite_unlocked.c
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@ -27,6 +27,40 @@
#include "libc/str/str.h"
#include "libc/sysv/consts/o.h"
static ssize_t writevall(int fd, struct iovec *iov, int iovlen) {
int olde;
ssize_t rc;
size_t got, toto;
toto = 0;
olde = errno;
do {
if ((rc = writev(fd, iov, iovlen)) == -1) {
if (toto && errno == EINTR) {
errno = olde;
continue;
}
return -1;
}
got = rc;
toto += got;
for (;;) {
if (!iov->iov_len) {
--iovlen;
++iov;
} else if (got >= iov->iov_len) {
got -= iov->iov_len;
--iovlen;
++iov;
} else {
iov->iov_base += got;
iov->iov_len -= got;
break;
}
}
} while (got && iovlen);
return toto;
}
/**
* Writes data to stream.
*
@ -104,7 +138,7 @@ size_t fwrite_unlocked(const void *data, size_t stride, size_t count, FILE *f) {
iov[1].iov_base = (void *)data;
iov[1].iov_len = n;
n += f->beg;
if (__robust_writev(f->fd, iov, 2) == -1) {
if ((rc = writevall(f->fd, iov, 2)) == -1) {
f->state = errno;
return 0;
}