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LibC: Make fwrite() buffered.

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This is a really naive implementation that makes fwrite() call fputc()
internally, but it still performs a lot better due to avoiding the write()
syscall every time.
This commit is contained in:
Andreas Kling 2019-04-27 17:32:47 +02:00
parent 52139a2392
commit d3fb0a56ed
1 changed files with 7 additions and 7 deletions
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14
LibC/stdio.cpp
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@ -254,13 +254,13 @@ size_t fread(void* ptr, size_t size, size_t nmemb, FILE* stream)
size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE* stream) size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE* stream)
{ {
assert(stream); assert(stream);
int rc = fflush(stream); auto* bytes = (const byte*)ptr;
if (rc == EOF) ssize_t nwritten = 0;
return 0; for (size_t i = 0; i < (size * nmemb); ++i) {
ssize_t nwritten = write(stream->fd, ptr, nmemb * size); int rc = fputc(bytes[i], stream);
if (nwritten < 0) { if (rc == EOF)
stream->error = errno; break;
return 0; ++nwritten;
} }
return nwritten / size; return nwritten / size;
} }