Thread: Accessing Member from Structure Array

Code:

/* Exercise 8-2. Rewrite fopen and _fillbuf with fields instead of explicit bit operations.
Compare code size and execution speed.
*/


/* exercise.8-2.h */
#define NULL      0
#define EOF       (-1)
#define BUFSIZ    1024
#define OPEN_MAX  20    /* max #files open at once */

struct _flags    /* bit-field vs define bitmasks */
{
    unsigned int _READ   : 1;
    unsigned int _WRITE  : 1;
    unsigned int _UNBUF  : 1;
    unsigned int _EOF    : 1;
    unsigned int _ERR    : 1;
};

typedef struct _iobuf
{
    int cnt;                /* characters left */
    char *ptr;              /* next character position */
    char *base;             /* location of buffer */
    struct _flags flag;        /* mode of file access */
    int fd;                 /* file descriptor */
} FILE_;

FILE_ _iob[OPEN_MAX] = {    /* stdin, stdout, stderr */
                            { 0, (char *) 0, (char *) 0, 0, 0 },
                            { 0, (char *) 0, (char *) 0, 0, 1 },
                            { 0, (char *) 0, (char *) 0, 0, 2 }
                        };

_iob[0].flag._READ = 1;
_iob[0].flag._WRITE = 0;
_iob[0].flag._UNBUF = 0;
_iob[0].flag._EOF = 0;
_iob[0].flag._ERR = 0;
_iob[1].flag._READ = 0;
_iob[1].flag._WRITE = 1;
_iob[1].flag._UNBUF = 0;
_iob[1].flag._EOF = 0;
_iob[1].flag._ERR = 0;
_iob[2].flag._READ = 0;
_iob[2].flag._WRITE = 1;
_iob[2].flag._UNBUF = 1;
_iob[2].flag._EOF = 0;
_iob[2].flag._ERR = 0;

In file included from exercise.8-2.c:3:
exercise.8-2.h:30: warning: large integer implicitly truncated to unsigned type
exercise.8-2.h:33: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:34: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:35: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:36: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:37: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:38: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:39: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:40: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:41: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:42: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:43: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:44: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:45: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:46: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
exercise.8-2.h:47: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token

I can't figure why I'm getting these errors. I'd really appreciate some help.

Thank You.

I was wondering about that. I was just about to declare my bit field as a union with an integer in it so I could assign a value to it. Thanks again.