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Annotation of coherent/b/lib/libc/XSTDIO/fread.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * libc/stdio/fread.c
        !             3:  * ANSI-compliant C standard i/o library.
        !             4:  * fread()
        !             5:  * ANSI 4.9.8.1.
        !             6:  * Read nmemb items of given size from stream to ptr.
        !             7:  */
        !             8: 
        !             9: #include <stdio.h>
        !            10: #include <stdlib.h>
        !            11: 
        !            12: size_t
        !            13: fread(ptr, size, nmemb, stream) const Void *ptr; size_t size, nmemb; register FILE *stream;
        !            14: {
        !            15:        register size_t nb;
        !            16:        register int c;
        !            17:        register unsigned char *p;
        !            18: 
        !            19:        if ((nb = size*nmemb) == 0)
        !            20:                return nb;
        !            21:        p = ptr;
        !            22: 
        !            23:        /* Read ungotten character if present. */
        !            24:        if (stream->_ff2 & _FUNGOT) {           
        !            25:                *p++ = (*stream->_f2p->_gt)(stream);
        !            26:                if (--nb == 0)
        !            27:                        return 1;
        !            28:        }
        !            29: 
        !            30:        /* If unbuffered, read() will work, otherwise use getc(). */
        !            31:        /* getc() sets _FEOF and _FERR as required, read() does not. */
        !            32:         if (stream->_mode == _MODE_FBUF || stream->_mode == _MODE_LBUF)
        !            33:                for (; nb && (c = getc(stream)) != EOF; nb--)
        !            34:                        *p++ = c;
        !            35:        else if ((c = read(fileno(stream), p, nb)) > 0)
        !            36:                nb -= c;
        !            37:        else if (c == 0)
        !            38:                stream->_ff1 |= _FEOF;
        !            39:        else
        !            40:                stream->_ff1 |= _FERR;
        !            41: 
        !            42:        /* Adjust seek after partial read. */
        !            43:        if (nb != 0 && nb % size != 0)
        !            44:                fseek(stream, (long)(nb % size - size), SEEK_CUR);
        !            45: 
        !            46:        return (size*nmemb-nb)/size;
        !            47: }
        !            48: 
        !            49: /* end of libc/stdio/fread.c */

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