The C Programming Language
To be continued...
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#include <stdio.h>
#include <fcntl.h>
#include "syscalls.h"
#defien PERMS 0666
void error(char *, ...);
/* cpº¯Êý: ½« f1 ¸´ÖƵ½ f2 */
int main(int argc, char *argv[])
{
int f1, f2, n;
char buf[BUFSIZ];
if (argc != 3)
error("Usage: c from to");
if ((f1 = open(argv[1], O_RDONLY, 0)) == -1)
error("cp: can't open %s", argv[1]);
if ((f2 = creat(argv[2], PERMS)) == -1)
error("cp: can't create %s, mode %03o", argv[2], PERMS);
while ((n = read(f1, buf, BUFSIZ)) > 0)
if (write(f2, buf, n) != n)
error("cp: write error on file %s", argv[2]);
return 0;
}
#include <stdio.h>
#include <stdarg.h>
/* errorº¯Êý: ´òÓ¡Ò»¸ö³ö´íÐÅÏ¢£¬È»ºóÖÕÖ¹ */
void error(char *fmt, ...)
{
va_list args;
va_start(args, fmt);
fprintf(stderr, "error:");
vfprintf(stderr, fmt, args);
fprintf(stderr, "\n");
va_end(args);
exit (1);
}
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