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[213.93.93.8]) by smtp.gmail.com with ESMTPSA id r8sm723207eds.39.2021.09.01.05.54.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Sep 2021 05:55:00 -0700 (PDT) From: Jacob Vosmaer To: gitster@pobox.com, peff@peff.net, me@ttaylorr.com, git@vger.kernel.org, ps@pks.im Cc: Jacob Vosmaer Subject: [PATCH v4 1/2] pkt-line: add stdio packet write functions Date: Wed, 1 Sep 2021 14:54:41 +0200 Message-Id: <20210901125442.34446-2-jacob@gitlab.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210901125442.34446-1-jacob@gitlab.com> References: <20210901125442.34446-1-jacob@gitlab.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org 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 Helped-by: Jeff King Signed-off-by: Jacob Vosmaer --- cache.h | 2 ++ pkt-line.c | 37 +++++++++++++++++++++++++++++++++++++ pkt-line.h | 11 +++++++++++ write-or-die.c | 12 ++++++++++++ 4 files changed, 62 insertions(+) diff --git a/cache.h b/cache.h index bd4869beee..dcf2454c3b 100644 --- a/cache.h +++ b/cache.h @@ -1736,6 +1736,8 @@ 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) diff --git a/pkt-line.c b/pkt-line.c index 9f63eae2e6..de4a94b437 100644 --- a/pkt-line.c +++ b/pkt-line.c @@ -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; diff --git a/pkt-line.h b/pkt-line.h index 5af5f45687..82b95e4bdd 100644 --- a/pkt-line.h +++ b/pkt-line.h @@ -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. diff --git a/write-or-die.c b/write-or-die.c index d33e68f6ab..0b1ec8190b 100644 --- a/write-or-die.c +++ b/write-or-die.c @@ -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"); +}