mirror of https://github.com/lua/lua
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
/*
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* zio.h
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* a generic input stream interface
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* $Id: zio.h,v 1.4 1997/06/13 13:49:16 lhf Exp $
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*/
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#ifndef zio_h
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#define zio_h
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#include <stdio.h>
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#define EOZ (-1) /* end of stream */
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typedef struct zio ZIO;
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int zgetc(ZIO* z); /* get next byte */
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int zungetc(ZIO* z); /* put back last byte read */
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int zread(ZIO* z, void* b, int n); /* read next n bytes */
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int zclose(ZIO* z); /* close stream */
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ZIO* zFopen(ZIO* z, FILE* f); /* open FILEs */
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ZIO* zfopen(ZIO* z, char* s, char* m); /* file by name */
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ZIO* zpopen(ZIO* z, char* s, char* m); /* pipe */
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ZIO* zsopen(ZIO* z, char* s); /* string */
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ZIO* zmopen(ZIO* z, char* b, int size); /* memory */
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#define zgetc(z) (--(z)->n>=0 ? ((int)*(z)->p++): (z)->filbuf(z))
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#define zungetc(z) (++(z)->n,--(z)->p)
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#define zclose(z) (*(z)->close)(z)
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/* --------- Private Part ------------------ */
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#define ZBSIZE 256 /* buffer size */
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struct zio {
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int n; /* bytes still unread */
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unsigned char* p; /* current position in buffer */
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int (*filbuf)(ZIO* z);
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int (*close)(ZIO* z);
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void* u; /* additional data */
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unsigned char buffer[ZBSIZE]; /* buffer */
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};
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#endif
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