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author | Rich Felker <dalias@aerifal.cx> | 2011-02-12 00:22:29 -0500 |
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committer | Rich Felker <dalias@aerifal.cx> | 2011-02-12 00:22:29 -0500 |
commit | 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch) | |
tree | 6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/stdio/fread.c | |
download | musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.zip musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.gz musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.bz2 |
initial check-in, version 0.5.0v0.5.0
Diffstat (limited to 'src/stdio/fread.c')
-rw-r--r-- | src/stdio/fread.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/stdio/fread.c b/src/stdio/fread.c new file mode 100644 index 0000000..0fa0b2a --- /dev/null +++ b/src/stdio/fread.c @@ -0,0 +1,49 @@ +#include "stdio_impl.h" + +#define MIN(a,b) ((a)<(b) ? (a) : (b)) + +size_t fread(void *destv, size_t size, size_t nmemb, FILE *f) +{ + unsigned char *dest = destv; + size_t len = size*nmemb, l = len, k; + + /* Never touch the file if length is zero.. */ + if (!l) return 0; + + FLOCK(f); + + for (;;) { + /* First exhaust the buffer. */ + k = MIN(f->rend - f->rpos, l); + memcpy(dest, f->rpos, k); + f->rpos += k; + dest += k; + l -= k; + + /* Stop on EOF or errors */ + if (f->flags & (F_EOF|F_ERR|F_NORD)) goto eof; + + /* Done? Or going unbuffered? */ + if (!l || l > f->buf_size/2) break; + + /* Otherwise, refill & read thru buffer. */ + __underflow(f); + } + + /* Read the remainder directly */ + for (; l; l-=k, dest+=k) { + k = f->read(f, dest, l); + if (k+1<=1) { + f->flags |= F_EOF | (F_ERR & k); + goto eof; + } + } + + FUNLOCK(f); + return nmemb; +eof: + FUNLOCK(f); + return (len-l)/size; +} + +weak_alias(fread, fread_unlocked); |