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usrp/p: cleanup and more command-line control

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- usrp/p.c (find_peak, main): moved data processing to separate function
- usrp/p.c (find_peak, usage, main): new option -s skip to set the number
  of samples to skip (default: 0)
- usrp/p.c (find_peak, usage, main): new option -d to dump the histogram
  instead of picking the peak
- usrp/p.c (find_peak, usage, main): the percentile can now be set on the
  command line (default: 0.9)
This commit is contained in:
Werner Almesberger 2010-11-12 11:48:20 -03:00
parent 38e5b8a3a9
commit 417ef7b8c1
1 changed files with 70 additions and 12 deletions
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74
usrp/p.c
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@ -1,11 +1,11 @@
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <math.h>
#include <sys/types.h>
#define PERC 0.9
#define SKIP 1000000
#define PERC_DEFAULT 0.9
static int comp(const void *_a, const void *_b)
@ -17,12 +17,12 @@ static int comp(const void *_a, const void *_b)
}
int main(int argc, char **argv)
static void find_peak(int skip, float percentile, int dump)
{
float max = 0;
float c[2], a;
float *rec = NULL;
int e = 0, n = 0, skip = SKIP;
int e = 0, n = 0;
while (1) {
size_t s;
@ -33,7 +33,7 @@ int main(int argc, char **argv)
break;
if (s < 0) {
perror("read");
return 1;
exit(1);
}
}
if (skip) {
@ -54,13 +54,71 @@ int main(int argc, char **argv)
rec[n] = a;
n++;
}
if (skip >= n) {
fprintf(stderr, "cannot skip %d of %d entries\n", skip, n);
exit(1);
}
rec += skip;
n -= skip;
qsort(rec, n, sizeof(float), comp);
printf("%f %f\n", max, rec[(int) (PERC*n)]);
#if 0
if (!dump)
printf("%f %f\n", max, rec[(int) (percentile*n)]);
else {
int i;
for (i = 0; i < n; i += 1000)
printf("%f %f\n", (double) i/n, rec[i]);
#endif
}
}
static void usage(const char *name)
{
fprintf(stderr,
"usage: %s [-s skip] [percentile]\n"
" %s [-s skip] -d\n\n"
" percentile select the specified percentile (default: %g)\n\n"
" -d dump the histogram\n"
" -s skip skip this number of samples from the beginning (default: 0)\n"
, name, name, PERC_DEFAULT);
exit(1);
}
int main(int argc, char **argv)
{
int dump = 0, skip = 0;
float perc = PERC_DEFAULT;
int c;
while ((c = getopt(argc, argv, "ds:")) != EOF)
switch (c) {
case 'd':
dump = 1;
break;
case 's':
skip = atoi(optarg);
break;
default:
usage(*argv);
}
switch (argc-optind) {
case 0:
break;
case 1:
if (dump)
usage(*argv);
perc = atof(argv[optind]);
break;
default:
usage(*argv);
}
find_peak(skip, perc, dump);
return 0;
}