On 2020-01-07 20:40, Vincent Torri wrote:
hello
have you looked at the exemple at the bottom of that page :
https://linux.die.net/man/3/strtol
Sure. My code works on linux using gnu compilers but does not work in
mingw64 using
(more or less) the same compilers and the results differ. Below is a a
tiny complete test program which demonstrates the issue showing the
issue, just cut and paste the indicated region into a bash shell on
linux and mingw64
#start cut here
cat >errno_prob.c <<'EOD'
/*
Build with:
gcc -Wall -std=c99 -pedantic -o errno_prob errno_prob.c
Run with
errno_prob "1.0e+40" #overflow test
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
int main(int argc,char **argv){
char *final;
errno=0;
float fv = strtof(argv[1],&final);
fprintf(stderr,"DEBUG buffer %p final %p fv %f errno
%d\n",argv[1],final,fv, errno);
fflush(stderr);
exit(EXIT_SUCCESS);
}
EOD
gcc -Wall -std=c99 -pedantic -o errno_prob errno_prob.c
./errno_prob "1.0e+40"
#end cut here
Outputs from the two systems:
linux: DEBUG buffer 0x7ffdb3ad8ee0 final 0x7ffdb3ad8ee6 fv inf errno
34
mingw64: DEBUG buffer 000000000068F970 final 000000000068F977 fv
1.#INF00 errno 0
The only significant difference is that errno is not set in the mingw64
one. It should be though, because 1.0e+40 is an ERANGE state, as
correctly indicated on linux.
No input I tried would make errno something other than 0. These were
tried:
1.0e+40
blech
.000000000000000000000000000000000000000000000000001
1000000000000000000000000000000000000000000000000000
1.0e-100
So why is errno not set in mingw64?
Thanks,
David Mathog
mat...@caltech.edu
Manager, Sequence Analysis Facility, Biology Division, Caltech
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