38 lines
676 B
C
38 lines
676 B
C
#include <u.h>
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#include <libc.h>
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#include <fcall.h>
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enum
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{
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DIRSIZE = STATFIXLEN + 16 * 4 /* enough for encoded stat buf + some reasonable strings */
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};
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Dir*
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dirfstat(int fd)
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{
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Dir *d;
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uchar *buf;
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int n, nd, i;
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nd = DIRSIZE;
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for(i=0; i<2; i++){ /* should work by the second try */
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d = malloc(sizeof(Dir) + BIT16SZ + nd);
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if(d == nil)
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return nil;
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buf = (uchar*)&d[1];
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n = fstat(fd, buf, BIT16SZ+nd);
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if(n < BIT16SZ){
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free(d);
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return nil;
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}
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nd = GBIT16(buf); /* upper bound on size of Dir + strings */
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if(nd <= n){
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convM2D(buf, n, d, (char*)&d[1]);
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return d;
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}
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/* else sizeof(Dir)+BIT16SZ+nd is plenty */
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free(d);
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}
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return nil;
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}
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