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floatscan-experiment.c: upgrade the experiment code, do not use STDIN

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This commit is contained in:
Intel A80486DX2-66 2024-03-02 15:29:04 +03:00
parent ca099f2797
commit 4f9ceae08f
Signed by: 80486DX2-66
GPG Key ID: 83631EF27054609B
1 changed files with 27 additions and 4 deletions
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31
c-programming/experiments/floatscan-experiment.c
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@ -18,7 +18,12 @@
#include <stdio.h>
/* wrapping code --- beginning */
#define shgetc(f) fgetc(f)
const char* fgetc_ptr = NULL;
int __shgetc(void);
long double floatscan(const char* s, int prec);
#define shgetc(f) __shgetc()
#define shlim(...)
#define shunget(...)
@ -531,10 +536,28 @@ long double __floatscan(FILE *f, int prec, int pok)
}
/* the original musl libc code --- end */
/* wrapping code --- beginning */
int __shgetc(void) {
return *fgetc_ptr++;
}
long double floatscan(const char* s, int prec) {
fgetc_ptr = s;
return __floatscan(NULL, prec, 1);
}
/* wrapping code --- end */
/* test code --- beginning */
int main(void) {
printf("LD_B1B_DIG = %d\n", LD_B1B_DIG);
printf("%La\n", __floatscan(stdin, LONG_DOUBLE_TYPE, 1));
int main(int argc, char** argv) {
char* value = argc > 1 ? argv[1] : "+314.1e-2";
const int prec = LD_B1B_DIG;
printf("Selected precision index = %d\n", prec);
long double result = floatscan(value, LONG_DOUBLE_TYPE);
printf("Input : %s\n", value);
printf("Decimal floating-point format: %Lf\n", result);
printf("Double floating-point format : %Lg\n", result);
printf("Hexadecimal form : %La\n", result);
return 0;
}
/* test code --- end */