110 lines
2.2 KiB
C
110 lines
2.2 KiB
C
/*
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* Copyright (C) 2016 Giacomo Tesio <giacomo@tesio.it>
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*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <libc.h>
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/*
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* In place, rewrite name to compress multiple /, eliminate ., and process ..
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*/
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#define SEP(x) ((x)=='/' || (x) == 0)
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char*
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jehanne_cleanname(char *name)
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{
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char *s; /* source of copy */
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char *d; /* destination of copy */
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char *d0; /* start of path after the root name */
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Rune r;
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int rooted;
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assert(name != nil);
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if(name[0] == 0)
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return jehanne_strcpy(name, ".");
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rooted = 0;
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d0 = name;
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if(d0[0] == '#'){
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if(d0[1] == 0)
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return d0;
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d0 += 1 + jehanne_chartorune(&r, d0+1); /* ignore slash: #/ */
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while(!SEP(*d0))
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d0 += jehanne_chartorune(&r, d0);
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if(*d0 == 0)
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return name;
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d0++; /* keep / after #<name> */
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rooted = 1;
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}else if(d0[0] == '/'){
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rooted = 1;
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d0++;
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}
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s = d0;
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if(rooted){
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/* skip extra '/' at root name */
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for(; *s == '/'; s++)
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;
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}
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/* remove dup slashes */
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for(d = d0; *s != 0; s++){
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*d++ = *s;
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if(*s == '/')
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while(s[1] == '/')
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s++;
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}
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*d = 0;
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d = d0;
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s = d0;
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while(*s != 0){
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if(s[0] == '.' && SEP(s[1])){
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if(s[1] == 0)
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break;
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s+= 2;
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continue;
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}
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if(s[0] == '.' && s[1] == '.' && SEP(s[2])){
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if(d == d0){
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if(rooted){
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/* /../x -> /x */
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if(s[2] == 0)
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break;
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s += 3;
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continue;
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}else{
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/* ../x -> ../x; and never collect ../ */
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d0 += 3;
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}
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}
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if(d > d0){
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/* a/../x -> x */
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assert(d-2 >= d0 && d[-1] == '/');
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for(d -= 2; d > d0 && d[-1] != '/'; d--)
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;
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if(s[2] == 0)
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break;
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s += 3;
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continue;
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}
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}
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while(!SEP(*s))
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*d++ = *s++;
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if(*s == 0)
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break;
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*d++ = *s++;
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}
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*d = 0;
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if(d-1 > name && d[-1] == '/') /* thanks to #/ */
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*--d = 0;
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if(name[0] == 0)
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jehanne_strcpy(name, ".");
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return name;
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}
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