Last change
on this file was
444,
checked in by satin@…, 6 years ago
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.5 KB
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Rev | Line | |
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[444] | 1 | /* Copyright (C) 2007, 2008 Eric Blake |
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| 2 | * Permission to use, copy, modify, and distribute this software |
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| 3 | * is freely granted, provided that this notice is preserved. |
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| 4 | */ |
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| 5 | /* This code was derived from asprintf.c */ |
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| 6 | /* doc in viprintf.c */ |
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| 7 | |
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| 8 | #include <_ansi.h> |
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| 9 | #include <reent.h> |
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| 10 | #include <stdio.h> |
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| 11 | #include <stdarg.h> |
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| 12 | #include <limits.h> |
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| 13 | #include <errno.h> |
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| 14 | #include "local.h" |
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| 15 | |
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| 16 | char * |
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| 17 | _vasniprintf_r (struct _reent *ptr, |
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| 18 | char *buf, |
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| 19 | size_t *lenp, |
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| 20 | const char *fmt, |
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| 21 | va_list ap) |
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| 22 | { |
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| 23 | int ret; |
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| 24 | FILE f; |
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| 25 | size_t len = *lenp; |
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| 26 | |
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| 27 | if (buf && len) |
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| 28 | { |
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| 29 | /* mark an existing buffer, but allow allocation of larger string */ |
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| 30 | f._flags = __SWR | __SSTR | __SOPT; |
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| 31 | } |
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| 32 | else |
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| 33 | { |
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| 34 | /* mark a zero-length reallocatable buffer */ |
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| 35 | f._flags = __SWR | __SSTR | __SMBF; |
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| 36 | len = 0; |
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| 37 | buf = NULL; |
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| 38 | } |
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| 39 | f._bf._base = f._p = (unsigned char *) buf; |
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| 40 | /* For now, inherit the 32-bit signed limit of FILE._bf._size. |
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| 41 | FIXME - it would be nice to rewrite sys/reent.h to support size_t |
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| 42 | for _size. */ |
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| 43 | if (len > INT_MAX) |
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| 44 | { |
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| 45 | ptr->_errno = EOVERFLOW; |
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| 46 | return NULL; |
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| 47 | } |
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| 48 | f._bf._size = f._w = len; |
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| 49 | f._file = -1; /* No file. */ |
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| 50 | ret = _svfiprintf_r (ptr, &f, fmt, ap); |
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| 51 | if (ret < 0) |
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| 52 | return NULL; |
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| 53 | *lenp = ret; |
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| 54 | *f._p = '\0'; |
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| 55 | return (char *) f._bf._base; |
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| 56 | } |
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| 57 | |
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| 58 | #ifndef _REENT_ONLY |
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| 59 | |
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| 60 | char * |
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| 61 | vasniprintf (char *buf, |
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| 62 | size_t *lenp, |
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| 63 | const char *fmt, |
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| 64 | va_list ap) |
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| 65 | { |
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| 66 | return _vasniprintf_r (_REENT, buf, lenp, fmt, ap); |
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| 67 | } |
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| 68 | |
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| 69 | #endif /* ! _REENT_ONLY */ |
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