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This got broken in d8e877a89dae, where we returned 0 on the
first mismatch; we want to return 0 only when we consumed no
characters.
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We're missing type flags for:
hh: char
ll: vlong
z: size_t
t: ptrdiff_t
j: intmax_t
The lack of '%lld' was causing us to fail when parsing
timezone files. This brings us in line with the specifiers
in the C99 standard, section 7.19.6.2p11
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When a match() fails, we need to unget the character we
tried to match against, rather than leaving it consumed.
Also, we can't break out of a conversion before we reach
the end of a format string, because things like the '%n'
conversion do not consume anything, and should still be
handled.
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It's been 20 years since c99 came out. By now, if code
hasn't been fixed, it's not going to be. Requiring this
define just confuses porters.
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For ape, we never enabled warnings in cflags.
Turning it on brings up a lot of warnings. Most are noise,
but a few caught unused variables and trunctaions of pointers.
to smaller integers (int, long).
A few warnings remain.
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handling (thanks porlock)
theres a bug is in sclose() where it doesnt check if wp is beyond
the buffer. also wp was not updated after realloc().
bug was reported by porlock on 9fans:
Plan 9's implementation of the standard C functions snprintf and
vsnprintf have a buffer overrun bug.
If the buffer length equals the output length (without the terminating
null), then one too many characters is written to the buffer.
For example,
snprintf(buf, 4, "ABCD");
will write 5 characters to buf.
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when _syserrno() fails to map a plan9 error string to
a unix error number, we copy the plan9 error string
to the per process error buffer "plan9err" and set
errno = EPLAN9.
when strerror() is called with EPLAN9, it returns
a pointer to the plan9err buffer.
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in ape's vfprintf we don't check if the file we're writing is actually a string buffer, resulting in a return of -1, when we should actually return the number of bytes that would be written.
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store errno on the private process stack so its always per process
and not just per memory space. errno itself becomes a macro
dereferencing int *_errnoloc; which is initialized from main9.s
pointing to the private stack location.
various fixes in programs that just imported errno variable with
"extern int errno;" instead of including <errno.h>.
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python uses processes sharing memory. it requires at least fopen() to
be called by multiple threads at once so we introduce _IO_newfile()
which allocates the FILE structure slot under a lock.
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to start and remove inst/gui, add sys/lib/rootbind, cisfd(8) manpage
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