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#include <errno.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "panic.h"
void cat(int fd, char * name)
{
char buffer[4096];
size_t length;
while (0 < (length=read(fd, buffer, sizeof(buffer))))
if (length != write(1, buffer, length))
panic("write: %s: %s", name, strerror(errno));
if (0 > length)
panic("read: %s: %s", name, strerror(errno));
}
int main(int argc, char * argv[])
{
int i;
int fd;
if (1 == argc)
cat(0, "<stdin>");
else for (i = 1; i < argc; ++i)
{
fd = open(argv[i], O_RDONLY);
if (0 > fd)
panic("open: %s: %s", argv[i], strerror(errno));
else
{
cat(fd, argv[i]);
close(fd);
}
}
}
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