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C99 defines the {{fwrite()}} function as follows \[[ISO/IEC 9899:1999|AA. References#ISOBibliography#ISO/IEC 9899-1999]\]:

size_t fwrite(const void *restrict ptr, size_t size, size_t nitems, FILE *restrict stream);

The fwrite() function shall write, from the array pointed to by ptr, up to nitems elements whose size is specified by size, to the stream pointed to by stream. For each object, size calls shall be made to the fputc() function, taking the values (in order) from an array of unsigned char exactly overlaying the object. The file-position indicator for the stream (if defined) shall be advanced by the number of bytes successfully written. If an error occurs, the resulting value of the file-position indicator for the stream is unspecified.

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[http://www.opengroup.org/onlinepubs/009695399/functions/fwrite.html]
\[[ISO/IEC 9899:1999|AA. References#ISOBibliography#ISO/IEC 9899-1999]\] Section 7.19.8.2, "The fwrite function"

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