1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1982-2010 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Common Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.opensource.org/licenses/cpl1.0.txt *
11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
12 * *
13 * Information and Software Systems Research *
14 * AT&T Research *
15 * Florham Park NJ *
16 * *
17 * David Korn <dgk@research.att.com> *
18 * *
19 ***********************************************************************/
20 #pragma prototyped
21 /*
22 * cd [-LP] [dirname]
23 * cd [-LP] [old] [new]
24 * pwd [-LP]
25 *
26 * David Korn
27 * AT&T Labs
28 * research!dgk
29 *
30 */
31
32 #include "defs.h"
33 #include <stak.h>
34 #include <error.h>
35 #include "variables.h"
36 #include "path.h"
37 #include "name.h"
38 #include "builtins.h"
39 #include <ls.h>
40
41 /*
42 * Invalidate path name bindings to relative paths
43 */
rehash(register Namval_t * np,void * data)44 static void rehash(register Namval_t *np,void *data)
45 {
46 Pathcomp_t *pp = (Pathcomp_t*)np->nvalue.cp;
47 NOT_USED(data);
48 if(pp && *pp->name!='/')
49 nv_unset(np);
50 }
51
b_cd(int argc,char * argv[],void * extra)52 int b_cd(int argc, char *argv[],void *extra)
53 {
54 register char *dir;
55 Pathcomp_t *cdpath = 0;
56 register const char *dp;
57 register Shell_t *shp = ((Shbltin_t*)extra)->shp;
58 int saverrno=0;
59 int rval,flag=0;
60 char *oldpwd;
61 Namval_t *opwdnod, *pwdnod;
62 if(sh_isoption(SH_RESTRICTED))
63 errormsg(SH_DICT,ERROR_exit(1),e_restricted+4);
64 while((rval = optget(argv,sh_optcd))) switch(rval)
65 {
66 case 'L':
67 flag = 0;
68 break;
69 case 'P':
70 flag = 1;
71 break;
72 case ':':
73 errormsg(SH_DICT,2, "%s", opt_info.arg);
74 break;
75 case '?':
76 errormsg(SH_DICT,ERROR_usage(2), "%s", opt_info.arg);
77 break;
78 }
79 argv += opt_info.index;
80 argc -= opt_info.index;
81 dir = argv[0];
82 if(error_info.errors>0 || argc >2)
83 errormsg(SH_DICT,ERROR_usage(2),"%s",optusage((char*)0));
84 oldpwd = (char*)shp->pwd;
85 opwdnod = (shp->subshell?sh_assignok(OLDPWDNOD,1):OLDPWDNOD);
86 pwdnod = (shp->subshell?sh_assignok(PWDNOD,1):PWDNOD);
87 if(argc==2)
88 dir = sh_substitute(oldpwd,dir,argv[1]);
89 else if(!dir || *dir==0)
90 dir = nv_getval(HOME);
91 else if(*dir == '-' && dir[1]==0)
92 dir = nv_getval(opwdnod);
93 if(!dir || *dir==0)
94 errormsg(SH_DICT,ERROR_exit(1),argc==2?e_subst+4:e_direct);
95 #if _WINIX
96 if(*dir != '/' && (dir[1]!=':'))
97 #else
98 if(*dir != '/')
99 #endif /* _WINIX */
100 {
101 if(!(cdpath = (Pathcomp_t*)shp->cdpathlist) && (dp=(CDPNOD)->nvalue.cp))
102 {
103 if(cdpath=path_addpath((Pathcomp_t*)0,dp,PATH_CDPATH))
104 {
105 shp->cdpathlist = (void*)cdpath;
106 cdpath->shp = shp;
107 }
108 }
109 if(!oldpwd)
110 oldpwd = path_pwd(1);
111 }
112 if(*dir=='.')
113 {
114 /* test for pathname . ./ .. or ../ */
115 if(*(dp=dir+1) == '.')
116 dp++;
117 if(*dp==0 || *dp=='/')
118 cdpath = 0;
119 }
120 rval = -1;
121 do
122 {
123 dp = cdpath?cdpath->name:"";
124 cdpath = path_nextcomp(cdpath,dir,0);
125 #if _WINIX
126 if(*stakptr(PATH_OFFSET+1)==':' && isalpha(*stakptr(PATH_OFFSET)))
127 {
128 *stakptr(PATH_OFFSET+1) = *stakptr(PATH_OFFSET);
129 *stakptr(PATH_OFFSET)='/';
130 }
131 #endif /* _WINIX */
132 if(*stakptr(PATH_OFFSET)!='/')
133
134 {
135 char *last=(char*)stakfreeze(1);
136 stakseek(PATH_OFFSET);
137 stakputs(oldpwd);
138 /* don't add '/' of oldpwd is / itself */
139 if(*oldpwd!='/' || oldpwd[1])
140 stakputc('/');
141 stakputs(last+PATH_OFFSET);
142 stakputc(0);
143 }
144 if(!flag)
145 {
146 register char *cp;
147 stakseek(PATH_MAX+PATH_OFFSET);
148 #if SHOPT_FS_3D
149 if(!(cp = pathcanon(stakptr(PATH_OFFSET),PATH_DOTDOT)))
150 continue;
151 /* eliminate trailing '/' */
152 while(*--cp == '/' && cp>stakptr(PATH_OFFSET))
153 *cp = 0;
154 #else
155 if(*(cp=stakptr(PATH_OFFSET))=='/')
156 if(!pathcanon(cp,PATH_DOTDOT))
157 continue;
158 #endif /* SHOPT_FS_3D */
159 }
160 if((rval=chdir(path_relative(stakptr(PATH_OFFSET)))) >= 0)
161 goto success;
162 if(errno!=ENOENT && saverrno==0)
163 saverrno=errno;
164 }
165 while(cdpath);
166 if(rval<0 && *dir=='/' && *(path_relative(stakptr(PATH_OFFSET)))!='/')
167 rval = chdir(dir);
168 /* use absolute chdir() if relative chdir() fails */
169 if(rval<0)
170 {
171 if(saverrno)
172 errno = saverrno;
173 errormsg(SH_DICT,ERROR_system(1),"%s:",dir);
174 }
175 success:
176 if(dir == nv_getval(opwdnod) || argc==2)
177 dp = dir; /* print out directory for cd - */
178 if(flag)
179 {
180 dir = stakptr(PATH_OFFSET);
181 if (!(dir=pathcanon(dir,PATH_PHYSICAL)))
182 {
183 dir = stakptr(PATH_OFFSET);
184 errormsg(SH_DICT,ERROR_system(1),"%s:",dir);
185 }
186 stakseek(dir-stakptr(0));
187 }
188 dir = (char*)stakfreeze(1)+PATH_OFFSET;
189 if(*dp && (*dp!='.'||dp[1]) && strchr(dir,'/'))
190 sfputr(sfstdout,dir,'\n');
191 if(*dir != '/')
192 return(0);
193 nv_putval(opwdnod,oldpwd,NV_RDONLY);
194 if(oldpwd)
195 free(oldpwd);
196 flag = strlen(dir);
197 /* delete trailing '/' */
198 while(--flag>0 && dir[flag]=='/')
199 dir[flag] = 0;
200 nv_putval(pwdnod,dir,NV_RDONLY);
201 nv_onattr(pwdnod,NV_NOFREE|NV_EXPORT);
202 shp->pwd = pwdnod->nvalue.cp;
203 nv_scan(shp->track_tree,rehash,(void*)0,NV_TAGGED,NV_TAGGED);
204 path_newdir(shp->pathlist);
205 path_newdir(shp->cdpathlist);
206 return(0);
207 }
208
b_pwd(int argc,char * argv[],void * extra)209 int b_pwd(int argc, char *argv[],void *extra)
210 {
211 register int n, flag = 0;
212 register char *cp;
213 #if SHOPT_FS_3D
214 register Shell_t *shp = ((Shbltin_t*)extra)->shp;
215 #else
216 NOT_USED(extra);
217 #endif
218 NOT_USED(argc);
219 while((n = optget(argv,sh_optpwd))) switch(n)
220 {
221 case 'L':
222 flag = 0;
223 break;
224 case 'P':
225 flag = 1;
226 break;
227 case ':':
228 errormsg(SH_DICT,2, "%s", opt_info.arg);
229 break;
230 case '?':
231 errormsg(SH_DICT,ERROR_usage(2), "%s", opt_info.arg);
232 break;
233 }
234 if(error_info.errors)
235 errormsg(SH_DICT,ERROR_usage(2),"%s",optusage((char*)0));
236 if(*(cp = path_pwd(0)) != '/')
237 errormsg(SH_DICT,ERROR_system(1), e_pwd);
238 if(flag)
239 {
240 #if SHOPT_FS_3D
241 if(shp->lim.fs3d && (flag = mount(e_dot,NIL(char*),FS3D_GET|FS3D_VIEW,0))>=0)
242 {
243 cp = (char*)stakseek(++flag+PATH_MAX);
244 mount(e_dot,cp,FS3D_GET|FS3D_VIEW|FS3D_SIZE(flag),0);
245 }
246 else
247 #endif /* SHOPT_FS_3D */
248 cp = strcpy(stakseek(strlen(cp)+PATH_MAX),cp);
249 pathcanon(cp,PATH_PHYSICAL);
250 }
251 sfputr(sfstdout,cp,'\n');
252 return(0);
253 }
254
255