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* ioext.c: further simplify scm_read_string_x_partial by defining

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a macro	SCM_EBLOCK.
This commit is contained in:
Gary Houston 2001-01-18 22:54:54 +00:00
parent 21e39e8fe6
commit 10288a0948
2 changed files with 22 additions and 9 deletions
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26
libguile/ioext.c
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@ -69,6 +69,22 @@
#endif
#if defined (EAGAIN)
#define SCM_MAYBE_EAGAIN || errno == EAGAIN
#else
#define SCM_MAYBE_EAGAIN
#endif
#if defined (EWOULDBLOCK)
#define SCM_MAYBE_EWOULDBLOCK || errno == EWOULDBLOCK
#else
#define SCM_MAYBE_EWOULDBLOCK
#endif
/* MAYBE there is EAGAIN way of defining this macro but now I EWOULDBLOCK. */
#define SCM_EBLOCK(errno) \
(0 SCM_MAYBE_EAGAIN SCM_MAYBE_EWOULDBLOCK)
SCM_DEFINE (scm_read_string_x_partial, "read-string!/partial", 1, 3, 0,
(SCM str, SCM port_or_fdes, SCM start, SCM end),
"Read characters from an fport or file descriptor into a\n"
@ -140,17 +156,9 @@ SCM_DEFINE (scm_read_string_x_partial, "read-string!/partial", 1, 3, 0,
SCM_SYSCALL (chars_read = read (fdes, dest, read_len));
if (chars_read == -1)
{
#if defined (EWOULDBLOCK) || defined (EAGAIN)
if (
#if defined (EWOULDBLOCK)
errno == EWOULDBLOCK
#else
errno == EAGAIN
#endif
)
if (SCM_EBLOCK (errno))
chars_read = 0;
else
#endif
SCM_SYSERROR;
}
else if (chars_read == 0)