forked from Vhex-Kernel-Core/fxlibc
43 lines
896 B
C
43 lines
896 B
C
#include <stdio.h>
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#include <string.h>
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#include "fileutil.h"
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size_t fwrite(void const *data, size_t membsize, size_t nmemb, FILE *fp)
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{
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size_t size;
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if(__builtin_umul_overflow(membsize, nmemb, &size)) {
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fp->error = 1;
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return 0;
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}
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if(!fp->buf) {
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ssize_t rc = __fp_write(fp, data, size);
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return (rc == EOF) ? 0 : rc;
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}
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__fp_buffer_mode_write(fp);
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// TODO: fwrite: line buffering
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size_t size_written = 0;
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while(size_written < size) {
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/* Fill the buffer */
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size_t size_frag = fp->bufsize - fp->bufpos;
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if(size_frag > size - size_written)
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size_frag = size - size_written;
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memcpy(fp->buf + fp->bufpos, data + size_written, size_frag);
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size_written += size_frag;
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fp->bufpos += size_frag;
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if(fp->bufpos >= fp->bufsize) {
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ssize_t rc = __fp_write(fp, fp->buf, fp->bufpos);
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if(rc <= 0) /* error */
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break;
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fp->bufpos = 0;
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}
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}
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return size_written;
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}
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