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/* misc.c
* Miscellaneous Functions
* Jim Jackson Dec 96
*/
/*
* Copyright (C) 1997-2008 Jim Jackson jj@franjam.org.uk
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program - see the file COPYING; if not, write to
* the Free Software Foundation, Inc., 675 Mass Ave, Cambridge,
* MA 02139, USA.
*/
#include <stdio.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <limits.h>
#include <string.h>
#include "config.h"
/*
* delay(us) wait us microsecs using select. Effectively
* causes current process to stop and a reschedule take place
* as well as doing the delay.
*/
delay(us)
int us;
{
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = us;
(void)select( 1, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv );
}
/***ERR_RPT***/
/* err_rpt(err,msg)
*/
err_rpt(err,msg)
short int err;
char *msg;
{
extern char *sys;
if (err) fprintf(stderr,"[%s] %s : %s\n",sys,strerror(err),msg);
return(err);
}
/***HCF***/
/* hcf(x,y) find highest common factor of x and y
*/
hcf(x,y)
unsigned x,y;
{
register unsigned a,b,r;
if (x>y) {
a=x; b=y;
} else {
a=y; b=x;
}
for ( ; r=a%b ; a=b, b=r) { }
return(b);
}
/***PARSE***/
/* parse(s,aa,sep) splits s up into parameters and stores ptrs
* to each prm in ptr array aa (upto MAX_ARGS)
* params are space or tab or 'sep' seperated, and may be
* enclosed in single or double quotes e.g. 'this is 1 prm'
*
* returns number of parameters parsed
*/
parse(s,aa,sep)
char *s,**aa,sep;
{
char *p,*q,c;
int i;
#define EOL ((*s=='\0') || (*s=='\n'))
#define EOP ((*s==' ') || (*s=='\t') || (*s==sep))
#define QUOTE ((*s=='\'') || (*s=='"'))
#define MAX_ARGS 50
for ( i=1; ; i++) {
for ( ; EOP; s++) {} /* skip leading separators */
*aa++=p=s;
if (EOL) return((--i)?i:1);
if (i==MAX_ARGS) {
return(--i);
}
while (!(EOL || EOP)) {
if (QUOTE) {
for (s++; !(EOL || QUOTE); ) *p++=*s++;
if (QUOTE) s++;
} else *p++=*s++;
}
if (EOL) {*p='\0'; return(i);}
*p='\0';
++s;
}
}
#undef EOL
#undef EOP
/***mstosmaples***/
/*
* mstosamples(ms,sr) convert ms millisecs into number of samples
* given that the sample rate is sr samples/sec
*/
mstosamples(ms,sr)
int ms;
int sr;
{
int d;
int m;
m=INT_MAX/(4*sr); /* we need to make sure we don't overflow INT size
including when no. of samples may get upped for stereo
16 bit into a byte count for getting buffers etc
*/
for ( d=1000; d>0 && ms>m; d/=10 ) { ms/=10; }
if (d)
return((sr*ms+d/2)/d);
else
return(0);
}
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