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Annotation of researchv9/cmd/cfront/libC/stream/streambuf.c, revision 1.1.1.1

1.1       root        1: #include "stream.h"
                      2: 
                      3: /*
                      4:        Allocate some space for the buffer.
                      5:        Returns:        EOF on error
                      6:                        0 on success
                      7: */
                      8: int streambuf.doallocate()
                      9: {
                     10:        if ((base = new char[BUFSIZE]) != NULL) {
                     11:                pptr = gptr = base;
                     12:                eptr = base + BUFSIZE;
                     13:                alloc = 1;
                     14:                return 0;
                     15:        } else
                     16:                return EOF;
                     17: }
                     18: 
                     19: /*
                     20:        Come here on a put to a full buffer.  Allocate the buffer if 
                     21:        it is uninitialized.
                     22:        Returns:        EOF on error
                     23:                        the argument on success
                     24: */
                     25: virtual int streambuf.overflow(int c)
                     26: {
                     27:        if (allocate() == EOF) return EOF;
                     28:        if (c != EOF) *pptr++ = c;
                     29:        return c&0377;
                     30: }
                     31: 
                     32: /*
                     33:        Fill a buffer.
                     34:        Returns:        EOF on error or end of input
                     35:                        next character on success
                     36: */
                     37: virtual int streambuf.underflow()
                     38: {
                     39:        return EOF;
                     40: }

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