Rev 4921 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
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| 4921 | Serge | 1 | /* Copyright (C) 2007, 2008 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 sprintf.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(_asnprintf_r, (ptr, buf, lenp, fmt), |
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| 18 | struct _reent *__restrict 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 *__restrict fmt _DOTS) |
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| 22 | { |
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| 23 | int ret; |
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| 24 | va_list ap; |
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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 | va_start (ap, fmt); |
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| 52 | ret = _svfprintf_r (ptr, &f, fmt, ap); |
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| 53 | va_end (ap); |
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| 54 | if (ret < 0) |
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| 55 | return NULL; |
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| 56 | *lenp = ret; |
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| 57 | *f._p = '\0'; |
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| 58 | return (char *) f._bf._base; |
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| 59 | } |
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| 60 | |||
| 6099 | serge | 61 | #ifdef _NANO_FORMATTED_IO |
| 62 | char * |
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| 63 | _EXFUN(_asniprintf_r, (struct _reent *, char *, size_t *, const char *, ...) |
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| 64 | _ATTRIBUTE ((__alias__("_asnprintf_r")))); |
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| 65 | #endif |
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| 66 | |||
| 4921 | Serge | 67 | #ifndef _REENT_ONLY |
| 68 | |||
| 69 | char * |
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| 70 | _DEFUN(asnprintf, (buf, lenp, fmt), |
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| 71 | char *__restrict buf _AND |
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| 72 | size_t *__restrict lenp _AND |
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| 73 | const char *__restrict fmt _DOTS) |
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| 74 | { |
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| 75 | int ret; |
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| 76 | va_list ap; |
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| 77 | FILE f; |
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| 78 | size_t len = *lenp; |
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| 79 | struct _reent *ptr = _REENT; |
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| 80 | |||
| 81 | if (buf && len) |
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| 82 | { |
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| 83 | /* mark an existing buffer, but allow allocation of larger string */ |
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| 84 | f._flags = __SWR | __SSTR | __SOPT; |
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| 85 | } |
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| 86 | else |
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| 87 | { |
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| 88 | /* mark a zero-length reallocatable buffer */ |
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| 89 | f._flags = __SWR | __SSTR | __SMBF; |
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| 90 | len = 0; |
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| 91 | buf = NULL; |
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| 92 | } |
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| 93 | f._bf._base = f._p = (unsigned char *) buf; |
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| 94 | /* For now, inherit the 32-bit signed limit of FILE._bf._size. |
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| 95 | FIXME - it would be nice to rewrite sys/reent.h to support size_t |
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| 96 | for _size. */ |
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| 97 | if (len > INT_MAX) |
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| 98 | { |
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| 99 | ptr->_errno = EOVERFLOW; |
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| 100 | return NULL; |
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| 101 | } |
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| 102 | f._bf._size = f._w = len; |
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| 103 | f._file = -1; /* No file. */ |
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| 104 | va_start (ap, fmt); |
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| 105 | ret = _svfprintf_r (ptr, &f, fmt, ap); |
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| 106 | va_end (ap); |
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| 107 | if (ret < 0) |
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| 108 | return NULL; |
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| 109 | *lenp = ret; |
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| 110 | *f._p = '\0'; |
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| 111 | return (char *) f._bf._base; |
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| 112 | } |
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| 113 | |||
| 6099 | serge | 114 | #ifdef _NANO_FORMATTED_IO |
| 115 | char * |
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| 116 | _EXFUN(asniprintf, (char *, size_t *, const char *, ...) |
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| 117 | _ATTRIBUTE ((__alias__("asnprintf")))); |
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| 118 | #endif |
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| 4921 | Serge | 119 | #endif /* ! _REENT_ONLY */ |