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Code Issues 1 Releases Wiki Activity

Use snprintf(..., "%.17g", x) to pretty print numbers.

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This commit is contained in:
Toby Hutton 2023-10-11 12:52:30 +11:00
parent cb25a2ecd6
commit 6b15ed812b
1 changed files with 3 additions and 4 deletions
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7
src/core/pp.c
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@ -40,16 +40,15 @@
static void number_to_string_b(JanetBuffer *buffer, double x) {
janet_buffer_ensure(buffer, buffer->count + BUFSIZE, 2);
const char *fmt = (x == floor(x) &&
x <= JANET_INTMAX_DOUBLE &&
x >= JANET_INTMIN_DOUBLE) ? "%.0f" : "%g";
int count;
if (x == 0.0) {
/* Prevent printing of '-0' */
count = 1;
buffer->data[buffer->count] = '0';
} else {
count = snprintf((char *) buffer->data + buffer->count, BUFSIZE, fmt, x);
/* Use 17 significant digits in the %g format to avoid rounding off the fractional part (if
* it exists) and producing a value which looks like an integer. */
count = snprintf((char *) buffer->data + buffer->count, BUFSIZE, "%.17g", x);
}
buffer->count += count;
}