hello have you looked at the exemple at the bottom of that page :
https://linux.die.net/man/3/strtol ? Vincent Torri On Tue, Jan 7, 2020 at 11:54 PM David Mathog <mat...@caltech.edu> wrote: > > A program of mine "binload" which has key parts: > > #include <stdio.h> > #include <stdlib.h> > #include <string.h> > #include <ctype.h> > #include <limits.h> > #include <float.h> > #include <stdint.h> /* for uint8_t */ > #include <inttypes.h> /* for PRId64 */ > #include <time.h> > #include <unistd.h> /* for close */ > #include <errno.h> > > int main(int argc,char **argv){ > errno = 0; /* Works around an issue with OpenMPI preload which can > leaver errno set */ > > float fv; > char buffer[1024]; > char *final; > > /* code that reads a line of text and puts it into buffer */ > > fv = strtof(buffer,&final); > fprintf(stderr,"DEBUG buffer %p final %p fv %f errno > %d\n",buffer,final,fv, errno);fflush(stderr); > > is compiled on mingw64 with: > > gcc -o binload binload.c > > When the strtof() function runs with buffer containing the string > "1.0e+40" it fails, as it should, > because the value is too large for a float. On linux errno is set and > later code handles the error. However in mingw64 that debug line emits: > > DEBUG buffer 000000000068F970 final 000000000068F977 fv 1.#INF00 errno 0 > > Because errno is not set the error isn't handled correctly. If the > formatted float in "buffer" is > within range then strtof() returns the correct value. For instace, for > 1.0e+04 it emits: > > DEBUG buffer 000000000068F970 final 000000000068F977 fv 10000.000000 > errno 0 > > Am I using errno improperly for mingw64 (maybe some Windows variant is > needed instead?) or is there some other issue in play? > > Thanks, > > David Mathog > mat...@caltech.edu > Manager, Sequence Analysis Facility, Biology Division, Caltech > > > _______________________________________________ > Mingw-w64-public mailing list > Mingw-w64-public@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mingw-w64-public _______________________________________________ Mingw-w64-public mailing list Mingw-w64-public@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
