Re: [PATCH 2/2] v4l-utils: fix compilation with 64-bit time_t

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Hi Rosen,

Apologies, I hadn't seen this patch, it was filed in my spam folder for some reason.

On 10/06/2024 23:23, Rosen Penev wrote:
> musl since version 1.2.0 uses 64-bit time_t even on 32-bit. Cast to
> 64-bit for compatibility.
> 
> Signed-off-by: Rosen Penev <rosenp@xxxxxxxxx>
> ---
>  utils/cec-compliance/cec-compliance.cpp   |  3 ++-
>  utils/cec-compliance/cec-test-adapter.cpp |  5 +++--
>  utils/cec-ctl/cec-ctl.cpp                 | 19 ++++++++++---------
>  utils/cec-follower/cec-follower.cpp       |  3 ++-
>  utils/cec-follower/cec-processing.cpp     |  3 ++-
>  utils/keytable/keytable.c                 |  1 +
>  utils/libv4l2util/v4l2_driver.c           |  7 ++++---
>  utils/v4l2-tracer/retrace.cpp             |  2 +-
>  8 files changed, 25 insertions(+), 18 deletions(-)
> 
> diff --git a/utils/cec-compliance/cec-compliance.cpp b/utils/cec-compliance/cec-compliance.cpp
> index 8075e1d6..df633a33 100644
> --- a/utils/cec-compliance/cec-compliance.cpp
> +++ b/utils/cec-compliance/cec-compliance.cpp
> @@ -3,6 +3,7 @@
>   * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
>   */
>  
> +#include <cinttypes>
>  #include <sstream>
>  
>  #include <fcntl.h>
> @@ -279,7 +280,7 @@ static std::string ts2s(__u64 ts)
>  	t = res.tv_sec;
>  	s = ctime(&t);
>  	s = s.substr(0, s.length() - 6);
> -	sprintf(buf, "%03lu", res.tv_usec / 1000);
> +	sprintf(buf, "%03" PRIu64, (uint64_t)res.tv_usec / 1000);

This doesn't make sense: why is res.tv_usec cast to a uint64_t?
Is that field really a 64 bit value under musl? But in any case, tv_usec is
limited to 999999, so if it is a 64 bit value under musl, then just cast it
to unsigned long and leave the %03lu as-is.

The commit log is certainly insufficient since a lot of the changes in this
patch have nothing to do with time_t but with tv_n/usec.

Why use PRIu64? That's not explained in the commit log either. I had to look
that up, as I've never seen it used before.

As I understand it, musl doesn't support %llu in some cases? Looking at:

https://github.com/cloudius-systems/musl/blob/master/include/inttypes.h

it appears that PRIu64 can either be lu or llu. lu is used if UINTPTR_MAX == UINT64_MAX.

But if that is needed, then I expect to see a single patch converting every
%lld and %llu in v4l-utils to use PRId/u64. Here it is only done for some
time-related code.

Please don't mix changing to PRId/u64 with these time changes. If you believe
that is needed, then do that as a final patch for all of v4l-utils. But the
commit log should be very clear explaining why it is needed.

Regards,

	Hans

>  	return s + "." + buf;
>  }
>  
> diff --git a/utils/cec-compliance/cec-test-adapter.cpp b/utils/cec-compliance/cec-test-adapter.cpp
> index 08c856af..7a80d17b 100644
> --- a/utils/cec-compliance/cec-test-adapter.cpp
> +++ b/utils/cec-compliance/cec-test-adapter.cpp
> @@ -4,6 +4,7 @@
>   */
>  
>  #include <cerrno>
> +#include <cinttypes>
>  #include <ctime>
>  #include <string>
>  
> @@ -1276,9 +1277,9 @@ static int testLostMsgs(struct node *node)
>  			printf("\t\tReceived messages: %d of which %d were CEC_MSG_CEC_VERSION\n",
>  			       pending_rx_msgs, pending_rx_cec_version_msgs);
>  		if (pending_quick_msgs < pending_msgs)
> -			printf("\t\tReceived %d messages immediately, and %d over %ld seconds\n",
> +			printf("\t\tReceived %d messages immediately, and %d over %" PRIu64 " seconds\n",
>  			       pending_quick_msgs, pending_msgs - pending_quick_msgs,
> -			       time(nullptr) - start);
> +			       (uint64_t)time(nullptr) - start);
>  	}
>  	print_sfts(sft[1][1], "SFTs for repeating messages (>= 7)");
>  	print_sfts(sft[1][0], "SFTs for repeating remote messages (>= 7)");
> diff --git a/utils/cec-ctl/cec-ctl.cpp b/utils/cec-ctl/cec-ctl.cpp
> index 69aeb8cd..a2ffcb2b 100644
> --- a/utils/cec-ctl/cec-ctl.cpp
> +++ b/utils/cec-ctl/cec-ctl.cpp
> @@ -6,6 +6,7 @@
>  #include <algorithm>
>  #include <cctype>
>  #include <cerrno>
> +#include <cinttypes>
>  #include <cstring>
>  #include <ctime>
>  #include <map>
> @@ -416,7 +417,7 @@ std::string ts2s(__u64 ts)
>  		strftime(buf, sizeof(buf), "%a %b %e %T.000000", &tm);
>  	}
>  	secs = last_secs + t - last_t;
> -	sprintf(buf + 14, "%02u:%02u.%06lu", secs / 60, secs % 60, res.tv_usec);
> +	sprintf(buf + 14, "%02u:%02u.%06d", secs / 60, secs % 60, (int)res.tv_usec);
>  	return buf;
>  }
>  
> @@ -944,10 +945,10 @@ static void monitor(const struct node &node, __u32 monitor_time, const char *sto
>  		}
>  		fprintf(fstore, "# cec-ctl --store-pin\n");
>  		fprintf(fstore, "# version %d\n", CEC_CTL_VERSION);
> -		fprintf(fstore, "# start_monotonic %lu.%09lu\n",
> -			start_monotonic.tv_sec, start_monotonic.tv_nsec);
> -		fprintf(fstore, "# start_timeofday %lu.%06lu\n",
> -			start_timeofday.tv_sec, start_timeofday.tv_usec);
> +		fprintf(fstore, "# start_monotonic %" PRIu64 ".%09" PRIu64 "\n",
> +			(uint64_t)start_monotonic.tv_sec, (uint64_t)start_monotonic.tv_nsec);
> +		fprintf(fstore, "# start_timeofday %" PRIu64 ".%06" PRIu64 "\n",
> +			(uint64_t)start_timeofday.tv_sec, (uint64_t)start_timeofday.tv_usec);
>  		fprintf(fstore, "# log_addr_mask 0x%04x\n", node.log_addr_mask);
>  		fprintf(fstore, "# phys_addr %x.%x.%x.%x\n",
>  			cec_phys_addr_exp(node.phys_addr));
> @@ -986,10 +987,10 @@ static void monitor(const struct node &node, __u32 monitor_time, const char *sto
>  			 */
>  			clock_gettime(CLOCK_MONOTONIC, &start_monotonic);
>  			gettimeofday(&start_timeofday, nullptr);
> -			fprintf(fstore, "# start_monotonic %lu.%09lu\n",
> -				start_monotonic.tv_sec, start_monotonic.tv_nsec);
> -			fprintf(fstore, "# start_timeofday %lu.%06lu\n",
> -				start_timeofday.tv_sec, start_timeofday.tv_usec);
> +			fprintf(fstore, "# start_monotonic %" PRIu64 ".%09" PRIu64 "\n",
> +				(uint64_t)start_monotonic.tv_sec, (uint64_t)start_monotonic.tv_nsec);
> +			fprintf(fstore, "# start_timeofday %" PRIu64 ".%06" PRIu64 "\n",
> +				(uint64_t)start_timeofday.tv_sec, (uint64_t)start_timeofday.tv_usec);
>  			fflush(fstore);
>  			start_minute = now;
>  		}
> diff --git a/utils/cec-follower/cec-follower.cpp b/utils/cec-follower/cec-follower.cpp
> index a7481aea..9b29e3c6 100644
> --- a/utils/cec-follower/cec-follower.cpp
> +++ b/utils/cec-follower/cec-follower.cpp
> @@ -3,6 +3,7 @@
>   * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
>   */
>  
> +#include <cinttypes>
>  #include <cstring>
>  #include <ctime>
>  #include <sstream>
> @@ -354,7 +355,7 @@ void print_timers(struct node *node)
>  			printf("source: %s, ", source.c_str());
>  			if (t.recording_seq)
>  				printf("rec-seq: 0x%x, ", t.recording_seq);
> -			printf("needs: %ld %s\n", t.duration, "MB."); /* 1MB per second. */
> +			printf("needs: %" PRIu64 " %s\n", (uint64_t)t.duration, "MB."); /* 1MB per second. */
>  		}
>  		printf("Total media space available for recording: ");
>  		if (node->state.media_space_available >= 0)
> diff --git a/utils/cec-follower/cec-processing.cpp b/utils/cec-follower/cec-processing.cpp
> index 3b5c3ce5..cc38f143 100644
> --- a/utils/cec-follower/cec-processing.cpp
> +++ b/utils/cec-follower/cec-processing.cpp
> @@ -6,6 +6,7 @@
>  #include "linux/compiler.h"
>  
>  #include <cerrno>
> +#include <cinttypes>
>  #include <ctime>
>  #include <string>
>  
> @@ -74,7 +75,7 @@ static std::string ts2s(__u64 ts, bool wallclock)
>  	t = res.tv_sec;
>  	s = ctime(&t);
>  	s = s.substr(0, s.length() - 6);
> -	sprintf(buf, "%03lu", res.tv_usec / 1000);
> +	sprintf(buf, "%03" PRIu64, (uint64_t)res.tv_usec / 1000);
>  	return s + "." + buf;
>  }
>  
> diff --git a/utils/keytable/keytable.c b/utils/keytable/keytable.c
> index a726921a..ba7c7c4d 100644
> --- a/utils/keytable/keytable.c
> +++ b/utils/keytable/keytable.c
> @@ -214,6 +214,7 @@ static enum sysfs_protocols parse_sysfs_protocol(const char *name, bool all_allo
>  	return SYSFS_INVALID;
>  }
>  
> +__attribute__((format(printf, 3, 0)))
>  static void write_sysfs_protocols(enum sysfs_protocols protocols, FILE *fp, const char *fmt)
>  {
>  	const struct protocol_map_entry *pme;
> diff --git a/utils/libv4l2util/v4l2_driver.c b/utils/libv4l2util/v4l2_driver.c
> index 6b6366fa..5cd63fac 100644
> --- a/utils/libv4l2util/v4l2_driver.c
> +++ b/utils/libv4l2util/v4l2_driver.c
> @@ -15,6 +15,7 @@
>  #include <assert.h>
>  #include <errno.h>
>  #include <fcntl.h>
> +#include <inttypes.h>
>  #include <stdio.h>
>  #include <stdlib.h>
>  #include <string.h>
> @@ -174,13 +175,13 @@ static void prt_buf_info(char *name,struct v4l2_buffer *p)
>  {
>  	struct v4l2_timecode *tc=&p->timecode;
>  
> -	printf ("%s: %02ld:%02d:%02d.%08ld index=%d, type=%s, "
> +	printf ("%s: %02" PRIu64 ":%02d:%02d.%08" PRIu64 " index=%d, type=%s, "
>  		"bytesused=%d, flags=0x%08x, "
>  		"field=%s, sequence=%d, memory=%s, offset=0x%08x, length=%d\n",
> -		name, (p->timestamp.tv_sec/3600),
> +		name, (uint64_t)(p->timestamp.tv_sec/3600),
>  		(int)(p->timestamp.tv_sec/60)%60,
>  		(int)(p->timestamp.tv_sec%60),
> -		p->timestamp.tv_usec,
> +		(uint64_t)p->timestamp.tv_usec,
>  		p->index,
>  		prt_names(p->type,v4l2_type_names),
>  		p->bytesused,p->flags,
> diff --git a/utils/v4l2-tracer/retrace.cpp b/utils/v4l2-tracer/retrace.cpp
> index 60d64d8b..010936c0 100644
> --- a/utils/v4l2-tracer/retrace.cpp
> +++ b/utils/v4l2-tracer/retrace.cpp
> @@ -72,7 +72,7 @@ void retrace_mmap(json_object *mmap_obj, bool is_mmap64)
>  	                           (long) buf_address_retrace_pointer);
>  
>  	if (is_verbose() || (errno != 0)) {
> -		fprintf(stderr, "fd: %d, offset: %ld, ", fd_retrace, off);
> +		fprintf(stderr, "fd: %d, offset: %lld, ", fd_retrace, (long long)off);
>  		if (is_mmap64)
>  			perror("mmap64");
>  		else





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