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This can be useful if you want to create a bunch of temporary strings
with a common prefix. For example, when iterating over uniform
structure fields, one might want to create temporary strings like
"pallete.primary", "palette.outline", and "pallette.shadow".
This could be done by overwriting the '.' with a null-byte and calling
ralloc_asprintf_append, but that incurs the cost of strlen("pallete")
every time...when this is already known.
These new functions allow you rewrite the tail of the string, given a
starting index. If the starting index is the length of the string, this
is equivalent to appending.
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>
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