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Format: fixes substring ends before the start of the string (#2669)

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* Format: fix substring ends before the start of the string

Closes #2668

Signed-off-by: Don Yin <Don_Yin@outlook.com>

* Doc: moves changelog entry to Unreleased [ci skip]

I moved the unreleased fix out of the 2.70.0 section.

Signed-off-by: Don Yin <Don_Yin@outlook.com>

---------

Signed-off-by: Don Yin <Don_Yin@outlook.com>
This commit is contained in:
Don Yin
2026-10-26 05:34:50 +00:00
committed by GitHub
parent 197d1c6e5d
commit ad62e3d1f5
3 changed files with 3 additions and 1 deletions
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CHANGELOG.md
+1
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@@ -2,6 +2,7 @@
Bugfixes:
* Improved uptime detection on SunOS via kstat. (#2674, Uptime, SunOS)
* Fixed substring formatting returning the remaining string when a negative end index is before the start of the string. (General)
# 2.70.0
src/common/impl/format.c
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@@ -552,7 +552,7 @@ static bool parseFormatString(FFstrbuf* buffer, const FFstrbuf* formatstr, uint3
if (end < 0) {
end = (int32_t) tempString.length + end;
}
if ((uint32_t) end > tempString.length) {
if (end >= 0 && (uint32_t) end > tempString.length) {
end = (int32_t) tempString.length;
}
if (end > start) {
tests/format.c
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@@ -96,6 +96,7 @@ int main(void) {
VERIFY("output({1~10,10})", "12345 67890", "output()");
VERIFY("output({1~10,5})", "12345 67890", "output()");
VERIFY("output({1~3,-3})", "12345 67890", "output(45 67)");
VERIFY("output({1~0,-12})", "12345 67890", "output()");
VERIFY("output({1~-5,-3})", "12345 67890", "output(67)");
VERIFY("output({1~-0,10})", "12345 67890", "output(12345 6789)");
VERIFY("output({1~-3,-5})", "12345 67890", "output()");