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/**************************************************************************
This is a component of the hwclock program.
This file contains the code for various basic utility routines
needed by the other modules.
****************************************************************************/
#include <stdio.h>
#include <string.h>
#include "hwclock.h"
bool
is_in_cpuinfo(const char * const fmt, const char * const str) {
/*----------------------------------------------------------------------------
Return true iff the /proc/cpuinfo file shows the value 'str' for the
keyword 'fmt'. Both arguments are null-terminated strings.
If for any reason we can't read /proc/cpuinfo, return false.
-----------------------------------------------------------------------------*/
FILE *cpuinfo;
char field[256];
char format[256];
bool found;
sprintf(format, "%s : %s", fmt, "%255s");
found = FALSE; /* initial value */
if ((cpuinfo = fopen ("/proc/cpuinfo", "r")) != NULL) {
while (!feof(cpuinfo)) {
if (fscanf (cpuinfo, format, field) == 1) {
if (strncmp(field, str, strlen(str)) == 0)
found = TRUE;
break;
}
fgets (field, 256, cpuinfo);
}
fclose(cpuinfo);
}
return found;
}
char *
ctime2(const time_t time) {
/*----------------------------------------------------------------------------
Same as ctime() from the standard C library, except it takes a time_t
as an argument instead of a pointer to a time_t, so it is much more
useful.
Also, don't include a newline at the end of the returned string. If
the user wants a newline, he can provide it himself.
return value is in static storage within.
-----------------------------------------------------------------------------*/
static char retval[30];
strncpy(retval, ctime(&time), sizeof(retval));
retval[sizeof(retval)-1] = '\0';
/* Now chop off the last character, which is the newline */
if (strlen(retval) >= 1) /* for robustness */
retval[strlen(retval)-1] = '\0';
return(retval);
}
struct timeval
t2tv(time_t argument) {
/*----------------------------------------------------------------------------
Convert from "time_t" format to "timeval" format.
-----------------------------------------------------------------------------*/
struct timeval retval;
retval.tv_sec = argument;
retval.tv_usec = 0;
return(retval);
}
float
time_diff(struct timeval subtrahend, struct timeval subtractor) {
/*---------------------------------------------------------------------------
The difference in seconds between two times in "timeval" format.
----------------------------------------------------------------------------*/
return( (subtrahend.tv_sec - subtractor.tv_sec)
+ (subtrahend.tv_usec - subtractor.tv_usec) / 1E6 );
}
struct timeval
time_inc(struct timeval addend, float increment) {
/*----------------------------------------------------------------------------
The time, in "timeval" format, which is <increment> seconds after
the time <addend>. Of course, <increment> may be negative.
-----------------------------------------------------------------------------*/
struct timeval newtime;
newtime.tv_sec = addend.tv_sec + (int) increment;
newtime.tv_usec = addend.tv_usec + (increment - (int) increment) * 1E6;
/* Now adjust it so that the microsecond value is between 0 and 1 million */
if (newtime.tv_usec < 0) {
newtime.tv_usec += 1E6;
newtime.tv_sec -= 1;
} else if (newtime.tv_usec >= 1E6) {
newtime.tv_usec -= 1E6;
newtime.tv_sec += 1;
}
return(newtime);
}
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