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Fix time collation.

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Nuno Cruces
2023-03-13 04:19:06 +00:00
parent 56e8281bdb
commit 71da34861b
2 changed files with 12 additions and 9 deletions
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sqlite3/time.c
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@@ -4,15 +4,18 @@
static int time_collation(void *pArg, int nKey1, const void *pKey1, int nKey2,
const void *pKey2) {
// If keys are of different length, and both terminated by a Z,
// ignore the Z for collation purposes.
if (nKey1 && nKey2 && nKey1 != nKey2) {
const char *pK1 = (const char *)pKey1;
const char *pK2 = (const char *)pKey2;
if (pK1[nKey1 - 1] == 'Z' && pK2[nKey2 - 1] == 'Z') {
nKey1--;
nKey2--;
}
// Remove a Z suffix if one key is no longer than the other.
// A Z suffix collates before any character but after the empty string.
// This avoids making different keys equal.
const int nK1 = nKey1;
const int nK2 = nKey2;
const char *pK1 = (const char *)pKey1;
const char *pK2 = (const char *)pKey2;
if (nK1 && nK1 <= nK2 && pK1[nK1 - 1] == 'Z') {
nKey1--;
}
if (nK2 && nK2 <= nK1 && pK2[nK2 - 1] == 'Z') {
nKey2--;
}
int n = nKey1 < nKey2 ? nKey1 : nKey2;