Re: [PATCH] Ensure return value from xread() is always stored into an ssize_t

> This patch fixes all calls to xread() where the return value is not
> stored into an ssize_t. The patch should not have any effect whatsoever,
> other than putting better/more appropriate type names on variables.
>
> Signed-off-by: Johan Herland <johan@herland.net>
> ---
>
> Feel free to ignore this patch as it may be argued that it needlessly
> touches a lot of code, without having much (if any) positive effect
> at all.
>
>  builtin-apply.c          |    4 ++--
>  builtin-bundle.c         |    2 +-
>  builtin-fetch--tool.c    |    4 ++--
>  builtin-unpack-objects.c |    2 +-
>  combine-diff.c           |    2 +-
>  copy.c                   |    3 +--
>  diff.c                   |    2 +-
>  imap-send.c              |    2 +-
>  index-pack.c             |    2 +-
>  pkt-line.c               |    4 ++--
>  sha1_file.c              |    2 +-
>  ssh-upload.c             |    2 +-
>  12 files changed, 15 insertions(+), 16 deletions(-)
>
> diff --git a/builtin-apply.c b/builtin-apply.c
> index 8b8705a..0399743 100644
> --- a/builtin-apply.c
> +++ b/builtin-apply.c
> @@ -185,7 +185,7 @@ static void *read_patch_file(int fd, unsigned long *sizep)
>         void *buffer = xmalloc(alloc);
>
>         for (;;) {
> -               int nr = alloc - size;
> +               ssize_t nr = alloc - size;
>                 if (nr < 1024) {
>                         alloc += CHUNKSIZE;
>                         buffer = xrealloc(buffer, alloc);
> @@ -1468,7 +1468,7 @@ static int read_old_data(struct stat *st, const char *path, char **buf_p, unsign
>                         return error("unable to open %s", path);
>                 got = 0;
>                 for (;;) {
> -                       int ret = xread(fd, buf + got, size - got);
> +                       ssize_t ret = xread(fd, buf + got, size - got);
>                         if (ret <= 0)
>                                 break;
>                         got += ret;
> diff --git a/builtin-bundle.c b/builtin-bundle.c
> index d1635a0..306ad29 100644
> --- a/builtin-bundle.c
> +++ b/builtin-bundle.c
> @@ -48,7 +48,7 @@ static int read_string(int fd, char *buffer, int size)
>  {
>         int i;
>         for (i = 0; i < size - 1; i++) {
> -               int count = xread(fd, buffer + i, 1);
> +               ssize_t count = xread(fd, buffer + i, 1);
>                 if (count < 0)
>                         return error("Read error: %s", strerror(errno));
>                 if (count == 0) {
> diff --git a/builtin-fetch--tool.c b/builtin-fetch--tool.c
> index 2065466..12adb38 100644
> --- a/builtin-fetch--tool.c
> +++ b/builtin-fetch--tool.c
> @@ -6,11 +6,11 @@
>
>  static char *get_stdin(void)
>  {
> -       int offset = 0;
> +       size_t offset = 0;
>         char *data = xmalloc(CHUNK_SIZE);
>
>         while (1) {
> -               int cnt = xread(0, data + offset, CHUNK_SIZE);
> +               ssize_t cnt = xread(0, data + offset, CHUNK_SIZE);
>                 if (cnt < 0)
>                         die("error reading standard input: %s",
>                             strerror(errno));
> diff --git a/builtin-unpack-objects.c b/builtin-unpack-objects.c
> index 2bbda67..a6ff62f 100644
> --- a/builtin-unpack-objects.c
> +++ b/builtin-unpack-objects.c
> @@ -34,7 +34,7 @@ static void *fill(int min)
>                 offset = 0;
>         }
>         do {
> -               int ret = xread(0, buffer + len, sizeof(buffer) - len);
> +               ssize_t ret = xread(0, buffer + len, sizeof(buffer) - len);
>                 if (ret <= 0) {
>                         if (!ret)
>                                 die("early EOF");
> diff --git a/combine-diff.c b/combine-diff.c
> index cff9c5d..ea3ca5f 100644
> --- a/combine-diff.c
> +++ b/combine-diff.c
> @@ -714,7 +714,7 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
>                         result_size = len;
>                         result = xmalloc(len + 1);
>                         while (sz < len) {
> -                               int done = xread(fd, result+sz, len-sz);
> +                               ssize_t done = xread(fd, result+sz, len-sz);
>                                 if (done == 0)
>                                         break;
>                                 if (done < 0)
> diff --git a/copy.c b/copy.c
> index 08a3d38..d340bb2 100644
> --- a/copy.c
> +++ b/copy.c
> @@ -3,10 +3,9 @@
>  int copy_fd(int ifd, int ofd)
>  {
>         while (1) {
> -               int len;
>                 char buffer[8192];
>                 char *buf = buffer;
> -               len = xread(ifd, buffer, sizeof(buffer));
> +               ssize_t len = xread(ifd, buffer, sizeof(buffer));
>                 if (!len)
>                         break;
>                 if (len < 0) {
> diff --git a/diff.c b/diff.c
> index 8354e71..33297aa 100644
> --- a/diff.c
> +++ b/diff.c
> @@ -1411,7 +1411,7 @@ static int populate_from_stdin(struct diff_filespec *s)
>  #define INCREMENT 1024
>         char *buf;
>         unsigned long size;
> -       int got;
> +       ssize_t got;
>
>         size = 0;
>         buf = NULL;
> diff --git a/imap-send.c b/imap-send.c
> index 84df2fa..4283a4a 100644
> --- a/imap-send.c
> +++ b/imap-send.c
> @@ -224,7 +224,7 @@ socket_perror( const char *func, Socket_t *sock, int ret )
>  static int
>  socket_read( Socket_t *sock, char *buf, int len )
>  {
> -       int n = xread( sock->fd, buf, len );
> +       ssize_t n = xread( sock->fd, buf, len );
>         if (n <= 0) {
>                 socket_perror( "read", sock, n );
>                 close( sock->fd );
> diff --git a/index-pack.c b/index-pack.c
> index b9da19f..58c4a9c 100644
> --- a/index-pack.c
> +++ b/index-pack.c
> @@ -82,7 +82,7 @@ static void *fill(int min)
>                 die("cannot fill %d bytes", min);
>         flush();
>         do {
> -               int ret = xread(input_fd, input_buffer + input_len,
> +               ssize_t ret = xread(input_fd, input_buffer + input_len,
>                                 sizeof(input_buffer) - input_len);
>                 if (ret <= 0) {
>                         if (!ret)
> diff --git a/pkt-line.c b/pkt-line.c
> index b4cb7e2..b605268 100644
> --- a/pkt-line.c
> +++ b/pkt-line.c
> @@ -65,10 +65,10 @@ void packet_write(int fd, const char *fmt, ...)
>
>  static void safe_read(int fd, void *buffer, unsigned size)
>  {
> -       int n = 0;
> +       size_t n = 0;
>
>         while (n < size) {
> -               int ret = xread(fd, (char *) buffer + n, size - n);
> +               ssize_t ret = xread(fd, (char *) buffer + n, size - n);
>                 if (ret < 0)
>                         die("read error (%s)", strerror(errno));
>                 if (!ret)
> diff --git a/sha1_file.c b/sha1_file.c
> index 32244d7..be991ed 100644
> --- a/sha1_file.c
> +++ b/sha1_file.c
> @@ -2276,7 +2276,7 @@ int read_pipe(int fd, char** return_buf, unsigned long* return_size)
>  {
>         char* buf = *return_buf;
>         unsigned long size = *return_size;
> -       int iret;
> +       ssize_t iret;
>         unsigned long off = 0;
>
>         do {
> diff --git a/ssh-upload.c b/ssh-upload.c
> index 2f04572..498d41e 100644
> --- a/ssh-upload.c
> +++ b/ssh-upload.c
> @@ -86,7 +86,7 @@ static int serve_ref(int fd_in, int fd_out)
>
>  static void service(int fd_in, int fd_out) {
>         char type;
> -       int retval;
> +       ssize_t retval;
>         do {
>                 retval = xread(fd_in, &type, 1);
>                 if (retval < 1) {
> --
> 1.5.1.4
> -
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