112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
#ifndef XFILE_H
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#define XFILE_H
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#if defined(__cplusplus)
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extern "C" {
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#endif
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#include <stdio.h>
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#ifndef NULL
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# define NULL 0
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#endif
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#ifndef EOF
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# define EOF (-1)
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#endif
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#define XBUFSIZ 1024
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#define XOPEN_MAX 1024
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typedef struct {
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/* buffer */
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char buf[1]; /* fallback buffer */
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long cnt; /* characters left */
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char *ptr; /* next character position */
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char *base; /* location of the buffer */
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/* operators */
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struct {
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void *cookie;
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int (*read)(void *, char *, int);
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int (*write)(void *, const char *, int);
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long (*seek)(void *, long, int);
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int (*close)(void *);
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} vtable;
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int flag; /* mode of the file access */
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} xFILE;
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extern xFILE x_iob[XOPEN_MAX];
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#define xstdin (x_iob[0].vtable.cookie || (x_iob[0].vtable.cookie = stdin ), &x_iob[0])
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#define xstdout (x_iob[1].vtable.cookie || (x_iob[1].vtable.cookie = stdout), &x_iob[1])
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#define xstderr (x_iob[2].vtable.cookie || (x_iob[2].vtable.cookie = stderr), &x_iob[2])
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enum _flags {
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X_READ = 01,
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X_WRITE = 02,
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X_UNBUF = 04,
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X_EOF = 010,
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X_ERR = 020,
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X_LNBUF = 040
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};
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#define xclearerr(p) ((p)->flag &= ~(X_EOF | X_ERR))
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#define xfeof(p) (((p)->flag & X_EOF) != 0)
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#define xferror(p) (((p)->flag & X_ERR) != 0)
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#define xfileno(p) ((p)->fd)
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#define xgetc(p) \
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((--(p)->cnt >= 0) \
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? (unsigned char) *(p)->ptr++ \
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: x_fillbuf(p))
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#define xputc(x, p) \
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((--(p)->cnt >= 0 && !(((p)->flag & X_LNBUF) && (x) == '\n')) \
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? *(p)->ptr++ = (x) \
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: x_flushbuf(x, (p)))
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#define xgetchar() xgetc(xstdin)
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#define xputchar(x) xputc((x), xstdout)
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/* resource aquisition */
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xFILE *xfunopen(void *cookie, int (*read)(void *, char *, int), int (*write)(void *, const char *, int), long (*seek)(void *, long, int), int (*close)(void *));
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xFILE *xfopen(const char *, const char *);
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int xfclose(xFILE *);
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/* buffer management */
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int x_fillbuf(xFILE *);
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int x_flushbuf(int, xFILE *);
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int xfflush(xFILE *);
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/* direct IO */
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size_t xfread(void *, size_t, size_t, xFILE *);
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size_t xfwrite(const void *, size_t, size_t, xFILE *);
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enum {
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XSEEK_CUR,
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XSEEK_END,
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XSEEK_SET
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};
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/* indicator positioning */
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long xfseek(xFILE *, long, int);
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long xftell(xFILE *);
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void xrewind(xFILE *);
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/* character IO */
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int xfputc(int, xFILE *);
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int xfgetc(xFILE *);
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int xfputs(const char *, xFILE *);
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char *xfgets(char *, int, xFILE *);
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int xputs(const char *);
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int xungetc(int, xFILE *);
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/* formatted I/O */
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int xprintf(const char *, ...);
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int xfprintf(xFILE *, const char *, ...);
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int xvfprintf(xFILE *, const char *, va_list);
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#if defined(__cplusplus)
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}
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#endif
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#endif
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