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/*
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 * pANS stdio -- vsprintf
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 */
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#include "iolib.h"
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int vsprintf(char *buf, const char *fmt, va_list args){
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	int n;
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	FILE *f=sopenw();
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	if(f==NULL)
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		return 0;
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	setvbuf(f, buf, _IOFBF, 100000);
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	n=vfprintf(f, fmt, args);
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	sclose(f);
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	return n;
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}