| Issue |
173103
|
| Summary |
"0x." is considered a valid hex floating-point number to sscanf()
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
tydeman
|
The following program:
#include <assert.h>
#include <limits.h>
#include <errno.h>
#include <stdio.h>
#include <float.h>
#include <fenv.h>
#include <complex.h>
#include <math.h>
#pragma STDC FENV_ACCESS ON
#pragma STDC FP_CONTRACT OFF
#pragma STDC FENV_ROUND FE_TONEAREST
#pragma STDC FENV_DEC_ROUND FE_DEC_TONEAREST
#pragma STDC CX_LIMITED_RANGE OFF
int main(void){
if(1){
double d35 = -1.;
int i35 = -1;
int count = -1;
char string[8] = "1234567";
i35 = sscanf("junk()", "%le%n%8s", &d35, &count, string );
(void)printf("Results for known junk\n");
(void)printf("i35=%i\n", i35);
(void)printf("d35=%g\n", d35);
(void)printf("count=%i\n", count);
(void)printf("string='%s'\n", string);
(void)printf("\nBad results for bad hex floating point\n");
i35 = sscanf("0x.p0()", "%le%n%8s", &d35, &count, string );
(void)printf("i35=%i\n", i35);
(void)printf("d35=%g\n", d35);
(void)printf("count=%i\n", count);
(void)printf("string='%s'\n", string);
}
return 0;
}
Get:
Results for known junk
i35=0
d35=-1
count=-1
string='1234567'
Bad results for bad hex floating point
i35=2
d35=0
count=3
string='p0()'
"0x.p0" is missing hex digits on either side the the decimal point,
so is not a valid hex floating-point number, so is a matching failure.
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