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Annotation of researchv9/libc/gen/iread.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  *     iread - insistent read.  Same usage as read, but will always return
                      3:  *     either the exact number of bytes requested, 0, or -1, unless a call
                      4:  *     to read gets some data and a subsequent call returns 0.
                      5:  */
                      6: int
                      7: iread (fd, buf, n)
                      8:        int fd, n;
                      9:        register char *buf;
                     10: {
                     11:        register int r, offset;
                     12: 
                     13:        r = read (fd, buf, n);
                     14:        if (r <= 0)
                     15:                return r;
                     16:        offset = 0;
                     17:        while (r != n - offset && r > 0) {
                     18:                offset += r;
                     19:                r = read (fd, buf + offset, n - offset);
                     20:        }
                     21:        return r < 0? r: r + offset;
                     22: }

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