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1 | #ifndef UST_SNPRINTF_VARIOUS_H |
2 | #define UST_SNPRINTF_VARIOUS_H | |
3 | ||
4 | #include <stdarg.h> | |
5 | ||
6 | struct __sbuf { | |
7 | unsigned char *_base; | |
8 | int _size; | |
9 | }; | |
10 | ||
11 | /* | |
12 | * stdio state variables. | |
13 | * | |
14 | * The following always hold: | |
15 | * | |
16 | * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR), | |
17 | * _lbfsize is -_bf._size, else _lbfsize is 0 | |
18 | * if _flags&__SRD, _w is 0 | |
19 | * if _flags&__SWR, _r is 0 | |
20 | * | |
21 | * This ensures that the getc and putc macros (or inline functions) never | |
22 | * try to write or read from a file that is in `read' or `write' mode. | |
23 | * (Moreover, they can, and do, automatically switch from read mode to | |
24 | * write mode, and back, on "r+" and "w+" files.) | |
25 | * | |
26 | * _lbfsize is used only to make the inline line-buffered output stream | |
27 | * code as compact as possible. | |
28 | * | |
29 | * _ub, _up, and _ur are used when ungetc() pushes back more characters | |
30 | * than fit in the current _bf, or when ungetc() pushes back a character | |
31 | * that does not match the previous one in _bf. When this happens, | |
32 | * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff | |
33 | * _ub._base!=NULL) and _up and _ur save the current values of _p and _r. | |
34 | */ | |
35 | typedef struct __sFILE { | |
36 | unsigned char *_p; /* current position in (some) buffer */ | |
37 | int _r; /* read space left for getc() */ | |
38 | int _w; /* write space left for putc() */ | |
39 | short _flags; /* flags, below; this FILE is free if 0 */ | |
40 | short _file; /* fileno, if Unix descriptor, else -1 */ | |
41 | struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */ | |
42 | int _lbfsize; /* 0 or -_bf._size, for inline putc */ | |
43 | ||
44 | /* operations */ | |
45 | void *_cookie; /* cookie passed to io functions */ | |
46 | int (*_close)(void *); | |
47 | int (*_read)(void *, char *, int); | |
48 | fpos_t (*_seek)(void *, fpos_t, int); | |
49 | int (*_write)(void *, const char *, int); | |
50 | ||
51 | /* extension data, to avoid further ABI breakage */ | |
52 | struct __sbuf _ext; | |
53 | /* data for long sequences of ungetc() */ | |
54 | unsigned char *_up; /* saved _p when _p is doing ungetc data */ | |
55 | int _ur; /* saved _r when _r is counting ungetc data */ | |
56 | ||
57 | /* tricks to meet minimum requirements even when malloc() fails */ | |
58 | unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */ | |
59 | unsigned char _nbuf[1]; /* guarantee a getc() buffer */ | |
60 | ||
61 | /* separate buffer for fgetln() when line crosses buffer boundary */ | |
62 | struct __sbuf _lb; /* buffer for fgetln() */ | |
63 | ||
64 | /* Unix stdio files get aligned to block boundaries on fseek() */ | |
65 | int _blksize; /* stat.st_blksize (may be != _bf._size) */ | |
66 | fpos_t _offset; /* current lseek offset */ | |
67 | } LFILE; | |
68 | ||
69 | #define __SLBF 0x0001 /* line buffered */ | |
70 | #define __SNBF 0x0002 /* unbuffered */ | |
71 | #define __SRD 0x0004 /* OK to read */ | |
72 | #define __SWR 0x0008 /* OK to write */ | |
73 | /* RD and WR are never simultaneously asserted */ | |
74 | #define __SRW 0x0010 /* open for reading & writing */ | |
75 | #define __SEOF 0x0020 /* found EOF */ | |
76 | #define __SERR 0x0040 /* found error */ | |
77 | #define __SMBF 0x0080 /* _buf is from malloc */ | |
78 | #define __SAPP 0x0100 /* fdopen()ed in append mode */ | |
79 | #define __SSTR 0x0200 /* this is an sprintf/snprintf string */ | |
80 | #define __SOPT 0x0400 /* do fseek() optimisation */ | |
81 | #define __SNPT 0x0800 /* do not do fseek() optimisation */ | |
82 | #define __SOFF 0x1000 /* set iff _offset is in fact correct */ | |
83 | #define __SMOD 0x2000 /* true => fgetln modified _p text */ | |
84 | #define __SALC 0x4000 /* allocate string space dynamically */ | |
85 | ||
86 | #define __sferror(p) (((p)->_flags & __SERR) != 0) | |
87 | ||
88 | extern int ust_safe_fflush(LFILE *fp); | |
89 | extern int ust_safe_vfprintf(LFILE *fp, const char *fmt0, va_list ap); | |
90 | ||
e5bc3b0f PMF |
91 | extern size_t ust_safe_mbrtowc(wchar_t *pwc, const char *s, size_t n, mbstate_t *ps); |
92 | ||
bf0d695d | 93 | #endif /* UST_SNPRINTF_VARIOUS_H */ |