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fseeko.c

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/home/opencoverage/opencoverage/guest-scripts/coreutils/src/lib/fseeko.c

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1 /* An fseeko() function that, together with fflush(), is POSIX compliant. -

3 -

4 This program is free software; you can redistribute it and/or modify -

5 it under the terms of the GNU General Public License as published by -

6 the Free Software Foundation; either version 3, or (at your option) -

7 any later version. -

8 -

9 This program is distributed in the hope that it will be useful, -

10 but WITHOUT ANY WARRANTY; without even the implied warranty of -

11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -

12 GNU General Public License for more details. -

13 -

14 You should have received a copy of the GNU General Public License along -

15 with this program; if not, see <https://www.gnu.org/licenses/>. */ -

16 -

17 #include <config.h> -

18 -

19 /* Specification. */ -

20 #include <stdio.h> -

21 -

22 /* Get off_t, lseek, _POSIX_VERSION. */ -

23 #include <unistd.h> -

24 -

25 #include "stdio-impl.h" -

26 -

27 int -

28 fseeko (FILE *fp, off_t offset, int whence) -

29 #undef fseeko -

30 #if !HAVE_FSEEKO -

31 # undef fseek -

32 # define fseeko fseek -

33 #endif -

34 #if _GL_WINDOWS_64_BIT_OFF_T -

35 # undef fseeko -

36 # if HAVE__FSEEKI64 /* msvc, mingw64 */ -

37 # define fseeko _fseeki64 -

38 # else /* mingw */ -

39 # define fseeko fseeko64 -

40 # endif -

41 #endif -

42 { -

43 #if LSEEK_PIPE_BROKEN -

44 /* mingw gives bogus answers rather than failure on non-seekable files. */ -

45 if (lseek (fileno (fp), 0, SEEK_CUR) == -1) -

46 return EOF; -

47 #endif -

48 -

49 /* These tests are based on fpurge.c. */ -

50 #if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */ -

if (fp->_IO_read_end == fp->_IO_read_ptr

fp->_IO_read_e...->_IO_read_ptr	Description
TRUE	evaluated 2 times by 1 test Evaluated by: tac
FALSE	evaluated 2 times by 1 test Evaluated by: rm

&& fp->_IO_write_ptr == fp->_IO_write_base

fp->_IO_write_..._IO_write_base	Description
TRUE	evaluated 2 times by 1 test Evaluated by: tac
FALSE	never evaluated

0-2

&& fp->_IO_save_base == NULL)

fp->_IO_save_b...== ((void *)0)	Description
TRUE	evaluated 2 times by 1 test Evaluated by: tac
FALSE	never evaluated

0-2

54 #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__ -

55 /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */ -

56 # if defined __SL64 && defined __SCLE /* Cygwin */ -

57 if ((fp->_flags & __SL64) == 0) -

58 { -

59 /* Cygwin 1.5.0 through 1.5.24 failed to open stdin in 64-bit -

60 mode; but has an fseeko that requires 64-bit mode. */ -

61 FILE *tmp = fopen ("/dev/null", "r"); -

62 if (!tmp) -

63 return -1; -

64 fp->_flags |= __SL64; -

65 fp->_seek64 = tmp->_seek64; -

66 fclose (tmp); -

67 } -

68 # endif -

69 if (fp_->_p == fp_->_bf._base -

70 && fp_->_r == 0 -

71 && fp_->_w == ((fp_->_flags & (__SLBF | __SNBF | __SRD)) == 0 /* fully buffered and not currently reading? */ -

72 ? fp_->_bf._size -

73 : 0) -

74 && fp_ub._base == NULL) -

75 #elif defined __EMX__ /* emx+gcc */ -

76 if (fp->_ptr == fp->_buffer -

77 && fp->_rcount == 0 -

78 && fp->_wcount == 0 -

79 && fp->_ungetc_count == 0) -

80 #elif defined __minix /* Minix */ -

81 if (fp_->_ptr == fp_->_buf -

82 && (fp_->_ptr == NULL || fp_->_count == 0)) -

83 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, MSVC, NonStop Kernel, OpenVMS */ -

84 if (fp_->_ptr == fp_->_base -

85 && (fp_->_ptr == NULL || fp_->_cnt == 0)) -

86 #elif defined __UCLIBC__ /* uClibc */ -

87 if (((fp->__modeflags & __FLAG_WRITING) == 0 -

88 || fp->__bufpos == fp->__bufstart) -

89 && ((fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) == 0 -

90 || fp->__bufpos == fp->__bufread)) -

91 #elif defined __QNX__ /* QNX */ -

92 if ((fp->_Mode & 0x2000 /* _MWRITE */ ? fp->_Next == fp->_Buf : fp->_Next == fp->_Rend) -

93 && fp->_Rback == fp->_Back + sizeof (fp->_Back) -

94 && fp->_Rsave == NULL) -

95 #elif defined __MINT__ /* Atari FreeMiNT */ -

96 if (fp->__bufp == fp->__buffer -

97 && fp->__get_limit == fp->__bufp -

98 && fp->__put_limit == fp->__bufp -

99 && !fp->__pushed_back) -

100 #elif defined EPLAN9 /* Plan9 */ -

101 if (fp->rp == fp->buf -

102 && fp->wp == fp->buf) -

103 #elif FUNC_FFLUSH_STDIN < 0 && 200809 <= _POSIX_VERSION -

104 /* Cross-compiling to some other system advertising conformance to -

105 POSIX.1-2008 or later. Assume fseeko and fflush work as advertised. -

106 If this assumption is incorrect, please report the bug to -

107 bug-gnulib. */ -

108 if (0) -

109 #else -

110 #error "Please port gnulib fseeko.c to your platform! Look at the code in fseeko.c, then report this to bug-gnulib." -

111 #endif -

112 { -

113 /* We get here when an fflush() call immediately preceded this one (or -

114 if ftell() has created buffers but no I/O has occurred on a -

115 newly-opened stream). We know there are no buffers. */ -

116 off_t pos = lseek (fileno (fp), offset, whence); -

117

if (pos == -1)

pos == -1	Description
TRUE	never evaluated
FALSE	evaluated 2 times by 1 test Evaluated by: tac

0-2

118 { -

119 #if defined __sferror || defined __DragonFly__ || defined __ANDROID__ -

120 /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */ -

121 fp_->_flags &= ~__SOFF; -

122 #endif -

123

return -1;

never executed: return -1;

124 } -

125 -

126 #if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */ -

127 fp->_flags &= ~_IO_EOF_SEEN; -

128 fp->_offset = pos; -

129 #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__ -

130 /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */ -

131 # if defined __CYGWIN__ || (defined __NetBSD__ && __NetBSD_Version__ >= 600000000) || defined __minix -

132 /* fp_->_offset is typed as an integer. */ -

133 fp_->_offset = pos; -

134 # else -

135 /* fp_->_offset is an fpos_t. */ -

136 { -

137 /* Use a union, since on NetBSD, the compilation flags -

138 determine whether fpos_t is typedef'd to off_t or a struct -

139 containing a single off_t member. */ -

140 union -

141 { -

142 fpos_t f; -

143 off_t o; -

144 } u; -

145 u.o = pos; -

146 fp_->_offset = u.f; -

147 } -

148 # endif -

149 fp_->_flags |= __SOFF; -

150 fp_->_flags &= ~__SEOF; -

151 #elif defined __EMX__ /* emx+gcc */ -

152 fp->_flags &= ~_IOEOF; -

153 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, MSVC, NonStop Kernel, OpenVMS */ -

154 fp_->_flag &= ~_IOEOF; -

155 #elif defined __MINT__ /* Atari FreeMiNT */ -

156 fp->__offset = pos; -

157 fp->__eof = 0; -

158 #endif -

159

return 0;

executed 2 times by 1 test: return 0;

Executed by:

160 } -

161

return fseeko (fp, offset, whence);

executed 2 times by 1 test: return fseeko (fp, offset, whence);

Executed by:

162 } -

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