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/*
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 * Posix stdio -- fdopen
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 */
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#include "iolib.h"
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/*
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 * Open the named file with the given mode, using the given FILE
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 * Legal modes are given below, `additional characters may follow these sequences':
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 * r rb		open to read
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 * w wb		open to write, truncating
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 * a ab		open to write positioned at eof, creating if non-existant
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 * r+ r+b rb+	open to read and write, creating if non-existant
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 * w+ w+b wb+	open to read and write, truncating
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 * a+ a+b ab+	open to read and write, positioned at eof, creating if non-existant.
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 */
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FILE *fdopen(const int fd, const char *mode){
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	FILE *f;
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	qlock(&_stdiolk);
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	for(f=_IO_stream;f!=&_IO_stream[FOPEN_MAX];f++)
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		if(f->state==CLOSED)
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			break;
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	if(f==&_IO_stream[FOPEN_MAX]) {
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		qunlock(&_stdiolk);
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		return NULL;
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	}
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	f->fd=fd;
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	if(mode[0]=='a')
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		seek(f->fd, 0L, 2);
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	if(f->fd==-1) return NULL;
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	f->flags=0;
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	f->state=OPEN;
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	f->buf=0;
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	f->rp=0;
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	f->wp=0;
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	f->lp=0;
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	qunlock(&_stdiolk);
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	return f;
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}