ref: 57d690c482c7e5f57608befe7cb04797b1bff153
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) { char buf[8192], *f, *t; Dir *s, *d, nd; int n, ffd, tfd; f = strrchr(from, '/'); t = strrchr(to, '/'); f = f != nil ? f+1 : (char*)from; t = t != nil ? t+1 : (char*)to; if(*f == '\0' || strcmp(f, ".") == 0 || strcmp(f, "..") == 0 || *t == '\0' || strcmp(t, ".") == 0 || strcmp(t, "..") == 0){ errno = EINVAL; return -1; } if((s = _dirstat(from)) == nil){ _syserrno(); return -1; } if((d = _dirstat(to)) != nil){ if(d->qid.type == s->qid.type && d->qid.path == s->qid.path && d->qid.vers == s->qid.vers && d->type == s->type && d->dev == s->dev) goto out; /* same file */ if((d->mode ^ s->mode) & DMDIR){ errno = (d->mode & DMDIR) ? EISDIR : ENOTDIR; goto err; } } /* from and to are in same directory (we miss some cases) */ if(f-from==t-to && strncmp(from, to, f-from)==0){ if(d != nil && _REMOVE(to) < 0){ _syserrno(); goto err; } _nulldir(&nd); nd.name = t; if(_dirwstat(from, &nd) < 0){ _syserrno(); goto err; } goto out; } /* different directories: have to copy */ if((ffd = _OPEN(from, OREAD)) < 0){ _syserrno(); goto err; } if((s->mode & DMDIR) != 0 && _READ(ffd, buf, sizeof(buf)) > 0){ /* cannot copy non-empty directories */ errno = EXDEV; _CLOSE(ffd); goto err; } if(d != nil && _REMOVE(to) < 0){ _syserrno(); _CLOSE(ffd); goto err; } if((tfd = _CREATE(to, OWRITE, s->mode)) < 0){ _syserrno(); _CLOSE(ffd); goto err; } while((n = _READ(ffd, buf, sizeof(buf))) > 0){ if(_WRITE(tfd, buf, n) != n) break; } _CLOSE(ffd); _CLOSE(tfd); if(n != 0 || _REMOVE(from) < 0){ _syserrno(); _REMOVE(to); /* cleanup */ goto err; } out: free(s); free(d); return 0; err: free(s); free(d); return -1; }