ref: 63191949b911658c3774e727061fcf166ad9ace2
dir: /sys/src/ape/lib/ap/plan9/rename.c/
#include "lib.h" #include <unistd.h> #include <string.h> #include <stdio.h> #include <errno.h> #include <stdlib.h> #include "sys9.h" #include "dir.h" int rename(const char *from, const char *to) { int n, i; char *f, *t; Dir *d, nd; if(access(to, 0) >= 0){ if(_REMOVE(to) < 0){ _syserrno(); return -1; } } if((d = _dirstat(to)) != nil){ free(d); errno = EEXIST; return -1; } if((d = _dirstat(from)) == nil){ _syserrno(); return -1; } f = strrchr(from, '/'); t = strrchr(to, '/'); f = f? f+1 : from; t = t? t+1 : to; n = 0; if(f-from==t-to && strncmp(from, to, f-from)==0){ /* from and to are in same directory (we miss some cases) */ i = strlen(t); _nulldir(&nd); nd.name = t; if(_dirwstat(from, &nd) < 0){ _syserrno(); n = -1; } }else{ /* different directories: have to copy */ int ffd, tfd; char buf[8192]; if((ffd = _OPEN(from, OREAD)) < 0 || (tfd = _CREATE(to, OWRITE, d->mode)) < 0){ _CLOSE(ffd); _syserrno(); n = -1; } while(n>=0 && (n = _READ(ffd, buf, sizeof(buf))) > 0) if(_WRITE(tfd, buf, n) != n){ _syserrno(); n = -1; } _CLOSE(ffd); _CLOSE(tfd); if(n>0) n = 0; if(n == 0) { if(_REMOVE(from) < 0){ _syserrno(); return -1; } } } free(d); return n; }