[444] | 1 | /* Copyright (C) 2007, 2008 Eric Blake |
---|
| 2 | * Permission to use, copy, modify, and distribute this software |
---|
| 3 | * is freely granted, provided that this notice is preserved. |
---|
| 4 | */ |
---|
| 5 | /* This code was derived from asprintf.c */ |
---|
| 6 | /* doc in siprintf.c */ |
---|
| 7 | |
---|
| 8 | #include <_ansi.h> |
---|
| 9 | #include <reent.h> |
---|
| 10 | #include <stdio.h> |
---|
| 11 | #include <stdarg.h> |
---|
| 12 | #include <limits.h> |
---|
| 13 | #include <errno.h> |
---|
| 14 | #include "local.h" |
---|
| 15 | |
---|
| 16 | char * |
---|
| 17 | _asniprintf_r (struct _reent *ptr, |
---|
| 18 | char *buf, |
---|
| 19 | size_t *lenp, |
---|
| 20 | const char *fmt, ...) |
---|
| 21 | { |
---|
| 22 | int ret; |
---|
| 23 | va_list ap; |
---|
| 24 | FILE f; |
---|
| 25 | size_t len = *lenp; |
---|
| 26 | |
---|
| 27 | if (buf && len) |
---|
| 28 | { |
---|
| 29 | /* mark an existing buffer, but allow allocation of larger string */ |
---|
| 30 | f._flags = __SWR | __SSTR | __SOPT; |
---|
| 31 | } |
---|
| 32 | else |
---|
| 33 | { |
---|
| 34 | /* mark a zero-length reallocatable buffer */ |
---|
| 35 | f._flags = __SWR | __SSTR | __SMBF; |
---|
| 36 | len = 0; |
---|
| 37 | buf = NULL; |
---|
| 38 | } |
---|
| 39 | f._bf._base = f._p = (unsigned char *) buf; |
---|
| 40 | /* For now, inherit the 32-bit signed limit of FILE._bf._size. |
---|
| 41 | FIXME - it would be nice to rewrite sys/reent.h to support size_t |
---|
| 42 | for _size. */ |
---|
| 43 | if (len > INT_MAX) |
---|
| 44 | { |
---|
| 45 | ptr->_errno = EOVERFLOW; |
---|
| 46 | return NULL; |
---|
| 47 | } |
---|
| 48 | f._bf._size = f._w = len; |
---|
| 49 | f._file = -1; /* No file. */ |
---|
| 50 | va_start (ap, fmt); |
---|
| 51 | ret = _svfiprintf_r (ptr, &f, fmt, ap); |
---|
| 52 | va_end (ap); |
---|
| 53 | if (ret < 0) |
---|
| 54 | return NULL; |
---|
| 55 | *lenp = ret; |
---|
| 56 | *f._p = '\0'; |
---|
| 57 | return (char *) f._bf._base; |
---|
| 58 | } |
---|
| 59 | |
---|
| 60 | #ifndef _REENT_ONLY |
---|
| 61 | |
---|
| 62 | char * |
---|
| 63 | asniprintf (char *buf, |
---|
| 64 | size_t *lenp, |
---|
| 65 | const char *fmt, ...) |
---|
| 66 | { |
---|
| 67 | int ret; |
---|
| 68 | va_list ap; |
---|
| 69 | FILE f; |
---|
| 70 | size_t len = *lenp; |
---|
| 71 | struct _reent *ptr = _REENT; |
---|
| 72 | |
---|
| 73 | if (buf && len) |
---|
| 74 | { |
---|
| 75 | /* mark an existing buffer, but allow allocation of larger string */ |
---|
| 76 | f._flags = __SWR | __SSTR | __SOPT; |
---|
| 77 | } |
---|
| 78 | else |
---|
| 79 | { |
---|
| 80 | /* mark a zero-length reallocatable buffer */ |
---|
| 81 | f._flags = __SWR | __SSTR | __SMBF; |
---|
| 82 | len = 0; |
---|
| 83 | buf = NULL; |
---|
| 84 | } |
---|
| 85 | f._bf._base = f._p = (unsigned char *) buf; |
---|
| 86 | /* For now, inherit the 32-bit signed limit of FILE._bf._size. |
---|
| 87 | FIXME - it would be nice to rewrite sys/reent.h to support size_t |
---|
| 88 | for _size. */ |
---|
| 89 | if (len > INT_MAX) |
---|
| 90 | { |
---|
| 91 | ptr->_errno = EOVERFLOW; |
---|
| 92 | return NULL; |
---|
| 93 | } |
---|
| 94 | f._bf._size = f._w = len; |
---|
| 95 | f._file = -1; /* No file. */ |
---|
| 96 | va_start (ap, fmt); |
---|
| 97 | ret = _svfiprintf_r (ptr, &f, fmt, ap); |
---|
| 98 | va_end (ap); |
---|
| 99 | if (ret < 0) |
---|
| 100 | return NULL; |
---|
| 101 | *lenp = ret; |
---|
| 102 | *f._p = '\0'; |
---|
| 103 | return (char *) f._bf._base; |
---|
| 104 | } |
---|
| 105 | |
---|
| 106 | #endif /* ! _REENT_ONLY */ |
---|