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Top Forums Programming search a file between two begin and end strings in c Post 302557534 by Corona688 on Wednesday 21st of September 2011 01:16:51 PM
Old 09-21-2011
Is that what the data looks like, or are the lines actually really long?

---------- Post updated at 11:06 AM ---------- Previous update was at 10:50 AM ----------

Will the process name always be NEWOLUF2?

---------- Post updated at 11:16 AM ---------- Previous update was at 11:06 AM ----------

Here's what I have so far, assuming the long lines were wrapped accidentally. It's much, much, much easier to write when you know what you're supposed to be operating on Smilie

Code:
$ cat begintrans.c
#include <stdio.h>
#include <string.h>

int main(void)
{
	char buf[16384];

	int transcount=0, elapsetotal=0;

	while(!feof(stdin))
	{
		int newoluf=0, elapsetime=-1;
		char timestamp[64]={0};

		buf[0]='\0';	// Blank out buffer

		while(strcmp(buf, "BEGINTRANS\n") != 0)	// look for BEGINTRANS
		if(fgets(buf, 16384, stdin) == NULL)
			break;	// EOF

		if(feof(stdin)) break;

		while(strcmp(buf, "ENDTRANS\n") != 0)	// Look for ENDTRANS
		{
			const char *tsstr;
			if(fgets(buf, 16384, stdin) == NULL)
				break;

			if(strstr(buf, "NEWOLUF2") != NULL)
				newoluf=1;

			if(tsstr=strstr(buf, "Timestamp"))
				sscanf(tsstr, "Timestamp <%[^>]>", timestamp);

			if(strncmp(buf, "ElapseTime", 10) == 0)
				sscanf(buf, "ElapseTime <%d>", &elapsetime);
		}

		if((elapsetime>=0) && (timestamp[0]))
		{
			transcount++;
			elapsetotal += elapsetime;
			printf("trans %d, elapsetime %d, timestamp %s\n",
				transcount, elapsetime, timestamp);
		}
	}

	printf("Average elapsetime is %d\n", elapsetotal / transcount);
	return(0);
}
$ gcc begintrans.c -o begintrans
$ ./begintrans < data
trans 1, elapsetime 745, timestamp 14Sep1111-07-37
trans 2, elapsetime 765, timestamp 14Sep1111-07-37
trans 3, elapsetime 579, timestamp 14Sep1111-07-37
trans 4, elapsetime 356, timestamp 14Sep1111-07-38
trans 5, elapsetime 651, timestamp 14Sep1111-07-41
trans 6, elapsetime 292, timestamp 14Sep1111-07-42
trans 7, elapsetime 345, timestamp 14Sep1111-07-52
Average elapsetime is 533
$

This User Gave Thanks to Corona688 For This Post:
 

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SD_JOURNAL_GET_REALTIME_USEC(3) 			   sd_journal_get_realtime_usec 			   SD_JOURNAL_GET_REALTIME_USEC(3)

NAME
sd_journal_get_realtime_usec, sd_journal_get_monotonic_usec - Read timestamps from the current journal entry SYNOPSIS
#include <systemd/sd-journal.h> int sd_journal_get_realtime_usec(sd_journal* j, uint64_t* usec); int sd_journal_get_monotonic_usec(sd_journal* j, uint64_t* usec, sd_id128_t* boot_id); DESCRIPTION
sd_journal_get_realtime_usec() gets the realtime (wallclock) timestamp of the current journal entry. It takes two arguments: the journal context object and a pointer to a 64-bit unsigned integer to store the timestamp in. The timestamp is in microseconds since the epoch, i.e. CLOCK_REALTIME. sd_journal_get_monotonic_usec() gets the monotonic timestamp of the current journal entry. It takes three arguments: the journal context object, a pointer to a 64-bit unsigned integer to store the timestamp in, as well as a 128-bit ID buffer to store the boot ID of the monotonic timestamp. The timestamp is in microseconds since boot-up of the specific boot, i.e. CLOCK_MONOTONIC. Since the monotonic clock begins new with every reboot, it only defines a well-defined point in time when used together with an identifier identifying the boot. See sd_id128_get_boot(3) for more information. If the boot ID parameter is passed NULL, the function will fail if the monotonic timestamp of the current entry is not of the current system boot. Note that these functions will not work before sd_journal_next(3) (or related call) has been called at least once, in order to position the read pointer at a valid entry. RETURN VALUE
sd_journal_get_realtime_usec() and sd_journal_get_monotonic_usec() returns 0 on success or a negative errno-style error code. If the boot ID parameter was passed NULL and the monotonic timestamp of the current journal entry is not of the current system boot, -ESTALE is returned by sd_journal_get_monotonic_usec(). NOTES
The sd_journal_get_realtime_usec() and sd_journal_get_monotonic_usec() interfaces are available as a shared library, which can be compiled and linked to with the libsystemd-journal pkg-config(1) file. SEE ALSO
systemd(1), sd-journal(3), sd_journal_open(3), sd_journal_next(3), sd_journal_get_data(3), sd_id128_get_boot(3), clock_gettime(2), sd_journal_get_cutoff_realtime_usec(3) systemd 208 SD_JOURNAL_GET_REALTIME_USEC(3)
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