47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
/* fread function */
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#include <string.h>
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#include "xstdio.h"
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_STD_BEGIN
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size_t (fread)(void *_Restrict ptr, size_t size, size_t nelem,
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FILE *_Restrict str)
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{ /* read into array from stream */
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size_t ns = size * nelem;
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unsigned char *s = (unsigned char *)ptr;
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if (ns == 0)
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return (0);
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_Lockfileatomic(str);
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if ((str->_Mode & _MBYTE) != 0)
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for (; 0 < ns && str->_Rback < str->_Back + sizeof (str->_Back); --ns)
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*s++ = *str->_Rback++;
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while (0 < ns)
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{ /* ensure chars in buffer */
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if (str->_Rsave != 0)
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str->_Rend = str->_Rsave, str->_Rsave = 0;
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if (str->_Next < str->_Rend)
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;
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else if (_Frprep(str) <= 0)
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break;
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{ /* deliver as many as possible */
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size_t m = str->_Rend - str->_Next;
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if (ns < m)
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m = ns;
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memcpy(s, str->_Next, m);
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s += m, ns -= m;
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str->_Next += m;
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}
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}
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_Unlockfileatomic(str);
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return ((size * nelem - ns) / size);
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}
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_STD_END
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/*
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* Copyright (c) 1992-2006 by P.J. Plauger. ALL RIGHTS RESERVED.
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* Consult your license regarding permissions and restrictions.
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V5.00:1296 */
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__SRCVERSION("fread.c $Rev: 153052 $");
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