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'scm_c_read' goes through the fast path with ISO-8859-1 unbuffered ports.
Discussed in <http://bugs.gnu.org/15368>. * libguile/ports.c (scm_c_read): Enter the 'swap_buffer' case when pt->encoding is "ISO-8859-1".
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@ -1657,7 +1657,9 @@ scm_c_read (SCM port, void *buffer, size_t size)
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requested number of bytes. (Note that a single scm_i_fill_input
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call does not guarantee to fill the whole of the port's read
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buffer.) */
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if (pt->read_buf_size <= 1 && pt->encoding == NULL)
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if (pt->read_buf_size <= 1 &&
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(pt->encoding == NULL
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|| c_strcasecmp (pt->encoding, "ISO-8859-1") == 0))
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{
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/* The port that we are reading from is unbuffered - i.e. does
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not have its own persistent buffer - but we have a buffer,
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