pkt-line: add stdio packet write functions

This adds three new functions to pkt-line.c: packet_fwrite,
packet_fwrite_fmt and packet_fflush. Besides writing a pktline flush
packet, packet_fflush also flushes the stdio buffer of the stream.

Helped-by: Patrick Steinhardt <ps@pks.im>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Jacob Vosmaer <jacob@gitlab.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jacob Vosmaer 2021-09-01 14:54:41 +02:00 коммит произвёл Junio C Hamano
Родитель c4203212e3
Коммит 96328398b3
4 изменённых файлов: 62 добавлений и 0 удалений

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@ -1738,6 +1738,8 @@ extern const char *git_mailmap_blob;
void maybe_flush_or_die(FILE *, const char *);
__attribute__((format (printf, 2, 3)))
void fprintf_or_die(FILE *, const char *fmt, ...);
void fwrite_or_die(FILE *f, const void *buf, size_t count);
void fflush_or_die(FILE *f);
#define COPY_READ_ERROR (-2)
#define COPY_WRITE_ERROR (-3)

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@ -243,6 +243,43 @@ void packet_write(int fd_out, const char *buf, size_t size)
die("%s", err.buf);
}
void packet_fwrite(FILE *f, const char *buf, size_t size)
{
size_t packet_size;
char header[4];
if (size > LARGE_PACKET_DATA_MAX)
die(_("packet write failed - data exceeds max packet size"));
packet_trace(buf, size, 1);
packet_size = size + 4;
set_packet_header(header, packet_size);
fwrite_or_die(f, header, 4);
fwrite_or_die(f, buf, size);
}
void packet_fwrite_fmt(FILE *fh, const char *fmt, ...)
{
static struct strbuf buf = STRBUF_INIT;
va_list args;
strbuf_reset(&buf);
va_start(args, fmt);
format_packet(&buf, "", fmt, args);
va_end(args);
fwrite_or_die(fh, buf.buf, buf.len);
}
void packet_fflush(FILE *f)
{
packet_trace("0000", 4, 1);
fwrite_or_die(f, "0000", 4);
fflush_or_die(f);
}
void packet_buf_write(struct strbuf *buf, const char *fmt, ...)
{
va_list args;

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@ -35,6 +35,17 @@ int packet_write_fmt_gently(int fd, const char *fmt, ...) __attribute__((format
int write_packetized_from_fd_no_flush(int fd_in, int fd_out);
int write_packetized_from_buf_no_flush(const char *src_in, size_t len, int fd_out);
/*
* Stdio versions of packet_write functions. When mixing these with fd
* based functions, take care to call fflush(3) before doing fd writes or
* closing the fd.
*/
void packet_fwrite(FILE *f, const char *buf, size_t size);
void packet_fwrite_fmt(FILE *f, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
/* packet_fflush writes a flush packet and flushes the stdio buffer of f */
void packet_fflush(FILE *f);
/*
* Read a packetized line into the buffer, which must be at least size bytes
* long. The return value specifies the number of bytes read into the buffer.

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@ -70,3 +70,15 @@ void write_or_die(int fd, const void *buf, size_t count)
die_errno("write error");
}
}
void fwrite_or_die(FILE *f, const void *buf, size_t count)
{
if (fwrite(buf, 1, count, f) != count)
die_errno("fwrite error");
}
void fflush_or_die(FILE *f)
{
if (fflush(f))
die_errno("fflush error");
}