diff options
Diffstat (limited to 'src/base/io/read.c')
-rw-r--r-- | src/base/io/read.c | 53 |
1 files changed, 50 insertions, 3 deletions
diff --git a/src/base/io/read.c b/src/base/io/read.c index b0ed3d2..d4f7bd9 100644 --- a/src/base/io/read.c +++ b/src/base/io/read.c @@ -1,7 +1,54 @@ #include "internal.h" -int -io·read(io·Stream *s, int sz, int n, void *buf) +intptr +io·read(io·Header *io, intptr len, void *buf) { - return fread(buf, sz, n, s); + uchar *b; + intptr c0, c, nr, n, ic; + + b = buf; + c = len; + ic = io->ilen; // how many bytes we've read and not flushed + + while(c > 0){ + n = -ic; + if(n > c) + n = c; + if(n == 0){ + /* only continue if we are a file reader */ + if(io->state != io·BufRdr) + break; + + /* get more bytes */ + if(sys·read(io->fd, io->cap, io->b, &nr)){ + io->state = io·BufNil; + break; + } + + if(nr == 0){ + io->state = io·BufEnd; + break; + } + + /* shift bytes within buffer so they end at terminal */ + io->g = io->b; + io->pos += nr; + if(nr < io->cap){ + io->g = io->e-nr; + mem·move(io->g, io->b, nr); + } + ic -= nr; + continue; + } + /* move our read bytes into the caller's buffer */ + mem·move(b, io->e+ic, n); + c -= n; + ic += n; + b += n; + } + io->ilen = ic; + if(c == len && io->state == io·BufNil) + return -1; + + return len-c; } |