[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 sprintf.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 | _asnprintf_r (struct _reent *__restrict ptr, |
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| 18 | char *buf, |
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| 19 | size_t *lenp, |
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| 20 | const char *__restrict fmt, ...) |
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| 21 | { |
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| 22 | int ret; |
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| 23 | va_list ap; |
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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 | va_start (ap, fmt); |
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| 51 | ret = _svfprintf_r (ptr, &f, fmt, ap); |
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| 52 | va_end (ap); |
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| 53 | if (ret < 0) |
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| 54 | return NULL; |
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| 55 | *lenp = ret; |
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| 56 | *f._p = '\0'; |
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| 57 | return (char *) f._bf._base; |
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| 58 | } |
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| 59 | |
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| 60 | #ifdef _NANO_FORMATTED_IO |
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| 61 | char * |
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| 62 | _asniprintf_r (struct _reent *, char *, size_t *, const char *, ...) |
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| 63 | _ATTRIBUTE ((__alias__("_asnprintf_r"))); |
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| 64 | #endif |
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| 65 | |
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| 66 | #ifndef _REENT_ONLY |
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| 67 | |
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| 68 | char * |
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| 69 | asnprintf (char *__restrict buf, |
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| 70 | size_t *__restrict lenp, |
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| 71 | const char *__restrict fmt, ...) |
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| 72 | { |
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| 73 | int ret; |
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| 74 | va_list ap; |
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| 75 | FILE f; |
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| 76 | size_t len = *lenp; |
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| 77 | struct _reent *ptr = _REENT; |
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| 78 | |
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| 79 | if (buf && len) |
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| 80 | { |
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| 81 | /* mark an existing buffer, but allow allocation of larger string */ |
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| 82 | f._flags = __SWR | __SSTR | __SOPT; |
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| 83 | } |
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| 84 | else |
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| 85 | { |
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| 86 | /* mark a zero-length reallocatable buffer */ |
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| 87 | f._flags = __SWR | __SSTR | __SMBF; |
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| 88 | len = 0; |
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| 89 | buf = NULL; |
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| 90 | } |
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| 91 | f._bf._base = f._p = (unsigned char *) buf; |
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| 92 | /* For now, inherit the 32-bit signed limit of FILE._bf._size. |
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| 93 | FIXME - it would be nice to rewrite sys/reent.h to support size_t |
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| 94 | for _size. */ |
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| 95 | if (len > INT_MAX) |
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| 96 | { |
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| 97 | ptr->_errno = EOVERFLOW; |
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| 98 | return NULL; |
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| 99 | } |
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| 100 | f._bf._size = f._w = len; |
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| 101 | f._file = -1; /* No file. */ |
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| 102 | va_start (ap, fmt); |
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| 103 | ret = _svfprintf_r (ptr, &f, fmt, ap); |
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| 104 | va_end (ap); |
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| 105 | if (ret < 0) |
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| 106 | return NULL; |
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| 107 | *lenp = ret; |
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| 108 | *f._p = '\0'; |
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| 109 | return (char *) f._bf._base; |
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| 110 | } |
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| 111 | |
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| 112 | #ifdef _NANO_FORMATTED_IO |
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| 113 | char * |
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| 114 | asniprintf (char *, size_t *, const char *, ...) |
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| 115 | _ATTRIBUTE ((__alias__("asnprintf"))); |
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| 116 | #endif |
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| 117 | #endif /* ! _REENT_ONLY */ |
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