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42 lines
520 B
C
42 lines
520 B
C
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#include <u.h>
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#include <libc.h>
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/*
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* /adm/users is
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* id:user/group:head member:other members
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*
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* /etc/{passwd,group}
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* name:x:nn:other stuff
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*/
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static int isnumber(char *s);
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sniff(Biobuf *b)
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{
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read first line of file into p;
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nf = getfields(p, f, nelem(f), ":");
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if(nf < 4)
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return nil;
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if(isnumber(f[0]) && !isnumber(f[2]))
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return _plan9;
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if(!isnumber(f[0]) && isnumber(f[2]))
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return _unix;
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return nil;
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}
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int
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isnumber(char *s)
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{
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char *q;
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strtol(s, &q, 10);
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return *q == '\0';
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}
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/* EOF */
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