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usrp/p: cleanup and more command-line control
- 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)
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usrp/p.c
82
usrp/p.c
@ -1,11 +1,11 @@
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <math.h>
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#include <sys/types.h>
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#define PERC 0.9
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#define SKIP 1000000
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#define PERC_DEFAULT 0.9
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static int comp(const void *_a, const void *_b)
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@ -17,12 +17,12 @@ static int comp(const void *_a, const void *_b)
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}
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int main(int argc, char **argv)
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static void find_peak(int skip, float percentile, int dump)
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{
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float max = 0;
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float c[2], a;
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float *rec = NULL;
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int e = 0, n = 0, skip = SKIP;
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int e = 0, n = 0;
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while (1) {
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size_t s;
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@ -33,7 +33,7 @@ int main(int argc, char **argv)
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break;
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if (s < 0) {
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perror("read");
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return 1;
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exit(1);
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}
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}
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if (skip) {
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@ -54,13 +54,71 @@ int main(int argc, char **argv)
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rec[n] = a;
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n++;
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}
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qsort(rec, n, sizeof(float), comp);
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printf("%f %f\n", max, rec[(int) (PERC*n)]);
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#if 0
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int i;
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for (i = 0; i < n; i += 1000)
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printf("%f %f\n", (double) i/n, rec[i]);
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#endif
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if (skip >= n) {
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fprintf(stderr, "cannot skip %d of %d entries\n", skip, n);
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exit(1);
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}
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rec += skip;
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n -= skip;
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qsort(rec, n, sizeof(float), comp);
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if (!dump)
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printf("%f %f\n", max, rec[(int) (percentile*n)]);
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else {
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int i;
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for (i = 0; i < n; i += 1000)
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printf("%f %f\n", (double) i/n, rec[i]);
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}
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}
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static void usage(const char *name)
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{
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fprintf(stderr,
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"usage: %s [-s skip] [percentile]\n"
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" %s [-s skip] -d\n\n"
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" percentile select the specified percentile (default: %g)\n\n"
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" -d dump the histogram\n"
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" -s skip skip this number of samples from the beginning (default: 0)\n"
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, name, name, PERC_DEFAULT);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int dump = 0, skip = 0;
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float perc = PERC_DEFAULT;
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int c;
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while ((c = getopt(argc, argv, "ds:")) != EOF)
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switch (c) {
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case 'd':
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dump = 1;
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break;
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case 's':
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skip = atoi(optarg);
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break;
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default:
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usage(*argv);
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}
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switch (argc-optind) {
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case 0:
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break;
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case 1:
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if (dump)
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usage(*argv);
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perc = atof(argv[optind]);
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break;
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default:
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usage(*argv);
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}
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find_peak(skip, perc, dump);
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return 0;
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}
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