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optimize(IO): reduce memory usage during reading data from files to FFstrbufs

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Avoid unnecessary calls of ffStrbufEnsureFree and only allocate
necessary memory.

In most cases, this will save 30% ~ 50% of memory used by ffAppendFDBuffer.
This commit is contained in:
apocelipes
2023-12-03 10:52:39 +09:00
committed by Carter Li
parent 2979bfe4ca
commit 4868517d53
5 changed files with 113 additions and 5 deletions
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tests/strbuf.c
+59
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@@ -334,6 +334,65 @@ int main(void)
VERIFY(strbuf.allocated > 0);
ffStrbufDestroy(&strbuf);
//ffStrbufEnsureFixedLengthFree / empty buffer
ffStrbufInit(&strbuf);
ffStrbufEnsureFixedLengthFree(&strbuf, 10);
VERIFY(strbuf.length == 0);
VERIFY(strbuf.allocated == 11);
ffStrbufDestroy(&strbuf);
ffStrbufInitA(&strbuf, 10);
ffStrbufEnsureFixedLengthFree(&strbuf, 10);
VERIFY(strbuf.length == 0);
VERIFY(strbuf.allocated == 11);
ffStrbufDestroy(&strbuf);
//ffStrbufEnsureFixedLengthFree / empty buffer with zero free length
ffStrbufInit(&strbuf);
ffStrbufEnsureFixedLengthFree(&strbuf, 0);
VERIFY(strbuf.length == 0);
VERIFY(strbuf.allocated == 0);
ffStrbufDestroy(&strbuf);
//ffStrbufEnsureFixedLengthFree / empty buffer but oldFree >= newFree
ffStrbufInitA(&strbuf, 11);
ffStrbufEnsureFixedLengthFree(&strbuf, 10);
VERIFY(strbuf.length == 0);
VERIFY(strbuf.allocated == 11);
ffStrbufDestroy(&strbuf);
ffStrbufInitA(&strbuf, 12);
ffStrbufEnsureFixedLengthFree(&strbuf, 10);
VERIFY(strbuf.length == 0);
VERIFY(strbuf.allocated == 12);
ffStrbufDestroy(&strbuf);
//ffStrbufEnsureFixedLengthFree / non empty buffer
ffStrbufAppendF(&strbuf, "%s", "1234567890");
VERIFY(strbuf.length == 10);
VERIFY(strbuf.allocated == 32);
ffStrbufEnsureFixedLengthFree(&strbuf, 0);
VERIFY(strbuf.length == 10);
VERIFY(strbuf.allocated == 32);
ffStrbufEnsureFixedLengthFree(&strbuf, 20); // less than oldFree (=21)
VERIFY(strbuf.length == 10);
VERIFY(strbuf.allocated == 32);
ffStrbufEnsureFixedLengthFree(&strbuf, 21); // equal to oldFree (=21)
VERIFY(strbuf.length == 10);
VERIFY(strbuf.allocated == 32);
ffStrbufEnsureFixedLengthFree(&strbuf, 22); // greater than oldFree (=21)
VERIFY(strbuf.length == 10);
VERIFY(strbuf.allocated == 33);
ffStrbufDestroy(&strbuf);
//ffStrbufEnsureFixedLengthFree / static buffer
ffStrbufInitStatic(&strbuf, "__TEST__");
VERIFY(strbuf.length > 0);
VERIFY(strbuf.allocated == 0);
ffStrbufEnsureFixedLengthFree(&strbuf, 10);
VERIFY(strbuf.length == strlen("__TEST__"));
VERIFY(strbuf.allocated == strlen("__TEST__") + 1 + 10);
VERIFY(ffStrbufEqualS(&strbuf, "__TEST__"));
ffStrbufDestroy(&strbuf);
//Success
puts("\033[32mAll tests passed!" FASTFETCH_TEXT_MODIFIER_RESET);
}