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update fpcalc.c to match book and lex 0x or x prefix for inputs. Also improve the output for f128 to match half/single/double

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This commit is contained in:
James Stine 2024-10-01 13:07:28 -05:00
parent 37d7305fef
commit d714a52cb6
1 changed files with 39 additions and 3 deletions
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42
examples/fp/fpcalc/fpcalc.c
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@ -224,8 +224,15 @@ __uint128_t strtoul128(char *num, int base) {
}
__uint128_t parseNum(char *num) {
// uint64_t result;
// uint64_t result;
__uint128_t result;
// Ensure input starts with "0x" or "x"
if (!(num[0] == '0' && num[1] == 'x') && !(num[0] == 'x')) {
printf("Error: Input must start with '0x' or 'x'\n");
exit(1);
}
int size; // size of operands in bytes (2= half, 4=single, 8 = double)
if (strlen(num) < 8) size = 2;
else if (strlen(num) < 16) size = 4;
@ -244,7 +251,34 @@ __uint128_t parseNum(char *num) {
opSize = size;
//printf ("Operand size is %d\n", opSize);
}
result = (__uint128_t)strtoul128(num, 16);
// Add to handle either input preference
// Strip the "x" or "0x" prefixes if present
if (num[0] == 'x' || (num[0] == '0' && num[1] == 'x')) {
num += (num[0] == 'x') ? 1 : 2;
}
if (strlen(num) <= 16) {
result = (__uint128_t)strtoull(num, NULL, 16);
}
else {
while (*num) {
int value;
if (*num >= '0' && *num <= '9')
value = *num - '0';
else if (*num >= 'a' && *num <= 'f')
value = *num - 'a' + 10;
else if (*num >= 'A' && *num <= 'F')
value = *num - 'A' + 10;
else {
printf("Error: invalid character in input\n");
exit(1);
}
result = (result << 4) | value;
num++;
}
}
//printf("Parsed %s as 0x%lx\n", num, result);
return result;
}
@ -387,8 +421,10 @@ int main(int argc, char *argv[])
}
printF128("X", x); printF128("Y", y);
//sprintf(cmd, "0x%016lx %c 0x%016lx", x.v, op1, y.v);
printf("0x%016" PRIx64 "_%016" PRIx64 " %c ", x.v[1], x.v[0], op1);
printf("0x%016" PRIx64 "_%016" PRIx64 " ", y.v[1], y.v[0]);
printF128(cmd, r); printFlags();
printF128val(r);
// printF128val(r);
}
}
}