jehanne/sys/src/cmd/cat.c

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/*
* This file is part of the UCB release of Plan 9. It is subject to the license
* terms in the LICENSE file found in the top-level directory of this
* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
* part of the UCB release of Plan 9, including this file, may be copied,
* modified, propagated, or distributed except according to the terms contained
* in the LICENSE file.
*/
#include <u.h>
#include <lib9.h>
void
cat(int f, char *s)
{
char buf[8192];
int32_t n;
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while((n=jehanne_read(f, buf, (int32_t)sizeof buf))>0)
if(jehanne_write(1, buf, n)!=n)
sysfatal("write error copying %s: %r", s);
if(n < 0)
sysfatal("error reading %s: %r", s);
}
void
main(int argc, char *argv[])
{
int f, i;
argv0 = "cat";
if(argc == 1)
cat(0, "<stdin>");
else for(i=1; i<argc; i++){
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f = sys_open(argv[i], OREAD);
if(f < 0)
sysfatal("can't open %s: %r", argv[i]);
else{
cat(f, argv[i]);
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sys_close(f);
}
}
exits(0);
}