Last change
on this file since 577 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.5 KB
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Line | |
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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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