formatex()
Code:
Same as format(), except does not perform a "copy back" check.
This means formatex() is faster, but DOES NOT ALLOW this type of call:
formatex(buffer, len, "%s", buffer)
formatex(buffer, len, buffer, buffer)
formatex(buffer, len, "%s", buffer[5])
This is because the output is directly stored into "buffer", rather than copied back at the end.
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