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90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
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/*
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* Copyright (c) 1993-1994 by Xerox Corporation. All rights reserved.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program
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* for any purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*/
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#ifndef EC_H
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#define EC_H
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# ifndef CORD_H
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# include "cord.h"
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# endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Extensible cords are strings that may be destructively appended to. */
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/* They allow fast construction of cords from characters that are */
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/* being read from a stream. */
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/*
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* A client might look like:
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*
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* {
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* CORD_ec x;
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* CORD result;
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* char c;
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* FILE *f;
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*
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* ...
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* CORD_ec_init(x);
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* while(...) {
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* c = getc(f);
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* ...
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* CORD_ec_append(x, c);
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* }
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* result = CORD_balance(CORD_ec_to_cord(x));
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*
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* If a C string is desired as the final result, the call to CORD_balance
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* may be replaced by a call to CORD_to_char_star.
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*/
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# ifndef CORD_BUFSZ
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# define CORD_BUFSZ 128
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# endif
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typedef struct CORD_ec_struct {
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CORD ec_cord;
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char * ec_bufptr;
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char ec_buf[CORD_BUFSZ+1];
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} CORD_ec[1];
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/* This structure represents the concatenation of ec_cord with */
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/* ec_buf[0 ... (ec_bufptr-ec_buf-1)] */
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/* Flush the buffer part of the extended cord into ec_cord. */
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/* Note that this is almost the only real function, and it is */
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/* implemented in 6 lines in cordxtra.c */
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void CORD_ec_flush_buf(CORD_ec x);
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/* Convert an extensible cord to a cord. */
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# define CORD_ec_to_cord(x) (CORD_ec_flush_buf(x), (x)[0].ec_cord)
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/* Initialize an extensible cord. */
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#define CORD_ec_init(x) \
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((x)[0].ec_cord = 0, (void)((x)[0].ec_bufptr = (x)[0].ec_buf))
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/* Append a character to an extensible cord. */
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#define CORD_ec_append(x, c) \
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((void)((x)[0].ec_bufptr == (x)[0].ec_buf + CORD_BUFSZ \
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? (CORD_ec_flush_buf(x), 0) : 0), \
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(void)(*(x)[0].ec_bufptr++ = (c)))
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/* Append a cord to an extensible cord. Structure remains shared with */
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/* original. */
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void CORD_ec_append_cord(CORD_ec x, CORD s);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* EC_H */
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