Hi Michal,
You should use standard functions to decode floating points, for example
sscanf. See an example in Root tutorial "staff.C".
Rene Brun
lijowski@cosray2.wustl.edu wrote:
>
> The following code crashes most of the time with the
> segmentation violation in root 2.20/06 for SunOS5.4 on Sparc.
> But when compiled with gcc it works fine. It works also
> when instead calling a function I parse a string inside
> main macro.
>
> Thanks for any hints.
>
> Regards
>
> Michal Lijowski
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <math.h>
> #include <string.h>
>
> // -------------------------------------------------------------------------
>
> int getfloats(char *tmpstr, float *aa)
> // extracts up to 10 floating point numbers from a string
>
> {
> int SLEN = 40;
> char cc[2], str1[SLEN];
>
> int sl = strlen(tmpstr);
> printf("%4d %s", sl, tmpstr);
> cc[0] = tmpstr[0];
> int jj = 0;
> int ii = 0;
> while ( (ii < 10) && (jj < sl) ) {
> str1[0] = '\0';
> while ( (cc[0] != ' ') && (jj < sl) ) {
> strncat(str1, cc, 1);
> jj++;
> cc[0] = tmpstr[jj];
> }
> aa[ii] = atof(str1);
> ii++;
> // skip white spaces
> while ( (cc[0] == ' ') && (jj < sl) ) {
> jj++;
> cc[0] = tmpstr[jj];
> }
> }
> return ii;
> }
>
> // ---------------------------------------------------------------------
>
> void test_read()
> {
> char infile[200];
> float aa[10];
> int SLEN = 80, nn;
> char tmpstr[SLEN], str1[20], cc[2];
>
> sprintf(infile, "tmp.dat");
> printf("%s\n", infile);
> FILE *infp = fopen(infile, "r");
> if (infp == NULL) {
> printf("test_read2b can't open %s\n", infile);
> exit(1);
> }
> int npts = 0;
> // loop until EOF
> while (fgets(tmpstr, SLEN, infp) != NULL) {
> printf(" %s", tmpstr);
> nn = getfloats(tmpstr, aa);
> for (int ii = 0; ii < nn; ii++) {
> printf(" %f ", aa[ii]);
> }
> printf("\n");
> npts++;
> }
> fclose(infp);
> }
>
> A few lines of numbers from tmp.dat file.
> 0 318.52
> 1 318.51
> 2 318.51
> 3 318.50
> 4 318.50
> 5 318.49
> 6 318.48
> 7 318.47
> 8 318.46
> 9 318.45
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