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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* Copyright (C) 2007 Eric Blake |
| 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 vfprintf.c */ |
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| 7 | |||
| 8 | #include <_ansi.h> |
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| 9 | #include |
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| 10 | #include |
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| 11 | #include |
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| 12 | #include |
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| 13 | #include |
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| 14 | #include "local.h" |
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| 15 | |||
| 16 | char * |
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| 17 | _DEFUN(_vasnprintf_r, (ptr, buf, lenp, fmt, ap), |
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| 18 | struct _reent *ptr _AND |
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| 19 | char *buf _AND |
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| 20 | size_t *lenp _AND |
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| 21 | const char *fmt _AND |
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| 22 | va_list ap) |
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| 23 | { |
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| 24 | int ret; |
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| 25 | FILE f; |
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| 26 | size_t len = *lenp; |
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| 27 | |||
| 28 | if (buf && len) |
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| 29 | { |
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| 30 | /* mark an existing buffer, but allow allocation of larger string */ |
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| 31 | f._flags = __SWR | __SSTR | __SOPT; |
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| 32 | } |
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| 33 | else |
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| 34 | { |
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| 35 | /* mark a zero-length reallocatable buffer */ |
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| 36 | f._flags = __SWR | __SSTR | __SMBF; |
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| 37 | len = 0; |
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| 38 | buf = NULL; |
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| 39 | } |
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| 40 | f._bf._base = f._p = (unsigned char *) buf; |
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| 41 | /* For now, inherit the 32-bit signed limit of FILE._bf._size. |
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| 42 | FIXME - it would be nice to rewrite sys/reent.h to support size_t |
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| 43 | for _size. */ |
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| 44 | if (len > INT_MAX) |
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| 45 | { |
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| 46 | ptr->_errno = EOVERFLOW; |
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| 47 | return NULL; |
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| 48 | } |
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| 49 | f._bf._size = f._w = len; |
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| 50 | f._file = -1; /* No file. */ |
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| 51 | ret = _svfprintf_r (ptr, &f, fmt, ap); |
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| 52 | if (ret < 0) |
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| 53 | return NULL; |
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| 54 | *lenp = ret; |
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| 55 | *f._p = '\0'; |
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| 56 | return (char *) f._bf._base; |
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| 57 | } |
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| 58 | |||
| 6099 | serge | 59 | #ifdef _NANO_FORMATTED_IO |
| 60 | char * |
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| 61 | _EXFUN(_vasniprintf_r, (struct _reent*, char *, size_t *, |
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| 62 | const char *, __VALIST) |
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| 63 | _ATTRIBUTE ((__alias__("_vasnprintf_r")))); |
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| 64 | #endif |
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| 65 | |||
| 4349 | Serge | 66 | #ifndef _REENT_ONLY |
| 67 | |||
| 68 | char * |
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| 69 | _DEFUN(vasnprintf, (buf, lenp, fmt, ap), |
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| 70 | char *buf _AND |
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| 71 | size_t *lenp _AND |
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| 72 | const char *fmt _AND |
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| 73 | va_list ap) |
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| 74 | { |
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| 75 | return _vasnprintf_r (_REENT, buf, lenp, fmt, ap); |
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| 76 | } |
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| 77 | |||
| 6099 | serge | 78 | #ifdef _NANO_FORMATTED_IO |
| 79 | char * |
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| 80 | _EXFUN(vasniprintf, (char *, size_t *, const char *, __VALIST) |
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| 81 | _ATTRIBUTE ((__alias__("vasnprintf")))); |
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| 82 | #endif |
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| 4349 | Serge | 83 | #endif /* ! _REENT_ONLY */ |