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Annotation of researchv10no/libc/stdio/rdwr.c, revision 1.1

1.1     ! root        1: /* Copyright AT&T Bell Laboratories, 1993 */
        !             2: #include       <stdio.h>
        !             3: 
        !             4: unsigned
        !             5: fread(void *ptr, unsigned size, unsigned count, FILE *iop)
        !             6: {
        !             7:        int l, c;
        !             8:        unsigned char *s = ptr;
        !             9:        unsigned char *t;
        !            10:        unsigned long n = (unsigned long)count*size;
        !            11:        for(;;) {
        !            12:                l = iop->_cnt;
        !            13:                if(l > n) l = n;
        !            14:                t = iop->_ptr;
        !            15:                iop->_cnt -= l;
        !            16:                iop->_ptr += l;
        !            17:                n -= l;
        !            18:                while(--l >= 0)
        !            19:                        *s++ = *t++;
        !            20:                if(n == 0)
        !            21:                        return count;
        !            22:                c = getc(iop);
        !            23:                if(c == EOF)
        !            24:                        return count - (n+size-1)/size;
        !            25:                *s++ = c;
        !            26:                n--;
        !            27:        }
        !            28: }
        !            29: 
        !            30: unsigned
        !            31: fwrite(const void *ptr, unsigned size, unsigned count, FILE *iop)
        !            32: {
        !            33:        int l;
        !            34:        unsigned char *s = ptr;
        !            35:        unsigned char *t;
        !            36:        unsigned long n = (unsigned long)count*size;
        !            37:        for(;;) {
        !            38:                l = iop->_cnt;
        !            39:                if(l > n) l = n;
        !            40:                t = iop->_ptr;
        !            41:                iop->_cnt -= l;
        !            42:                iop->_ptr += l;
        !            43:                n -= l;
        !            44:                while(--l >= 0)
        !            45:                        *t++ = *s++;
        !            46:                if(n == 0)
        !            47:                        return count;
        !            48:                if(putc(*s++, iop) == EOF)
        !            49:                        return count - (n+size-1)/size;
        !            50:                n--;
        !            51:        }
        !            52: }

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