Mercurial > hg > Members > mitsuki > xv6_rpi2_port
view uprogs/cat.c @ 0:ed10291ff195
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author | mir3636 |
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date | Sun, 06 Jan 2019 19:27:03 +0900 |
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#include "types.h" #include "stat.h" #include "user.h" char buf[512]; void cat(int fd) { int n; while((n = read(fd, buf, sizeof(buf))) > 0) write(1, buf, n); if(n < 0){ printf(1, "cat: read error\n"); exit(); } } int main(int argc, char *argv[]) { int fd, i; if(argc <= 1){ cat(0); exit(); } for(i = 1; i < argc; i++){ if((fd = open(argv[i], 0)) < 0){ printf(1, "cat: cannot open %s\n", argv[i]); exit(); } cat(fd); close(fd); } exit(); }