From 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sat, 12 Feb 2011 00:22:29 -0500 Subject: initial check-in, version 0.5.0 --- src/stdio/ftell.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 src/stdio/ftell.c (limited to 'src/stdio/ftell.c') diff --git a/src/stdio/ftell.c b/src/stdio/ftell.c new file mode 100644 index 00000000..aa1f5381 --- /dev/null +++ b/src/stdio/ftell.c @@ -0,0 +1,35 @@ +#include "stdio_impl.h" + +off_t __ftello_unlocked(FILE *f) +{ + off_t pos = f->seek(f, 0, SEEK_CUR); + if (pos < 0) { + FUNLOCK(f); + return pos; + } + /* Adjust for data in buffer. */ + return pos - (f->rend - f->rpos) + (f->wpos - f->wbase); +} + +off_t __ftello(FILE *f) +{ + off_t pos; + FLOCK(f); + pos = __ftello_unlocked(f); + FUNLOCK(f); + return pos; +} + +long ftell(FILE *f) +{ + off_t pos = __ftello(f); + if (pos > LONG_MAX) { + errno = EOVERFLOW; + return -1; + } + return pos; +} + +weak_alias(__ftello, ftello); + +LFS64(ftello); -- cgit v1.2.1