1: /*$Id: grpath.c,v 1.40 2001/03/23 23:20:30 balay Exp $*/

 3:  #include petsc.h
 4:  #include petscsys.h
  5: #if defined(PETSC_HAVE_PWD_H)
  6: #include <pwd.h>
  7: #endif
  8: #include <ctype.h>
  9: #include <sys/types.h>
 10: #include <sys/stat.h>
 11: #if defined(PETSC_HAVE_UNISTD_H)
 12: #include <unistd.h>
 13: #endif
 14: #if defined(PETSC_HAVE_STDLIB_H)
 15: #include <stdlib.h>
 16: #endif
 17: #if !defined(PARCH_win32)
 18: #include <sys/utsname.h>
 19: #endif
 20: #if defined(PARCH_win32)
 21: #include <windows.h>
 22: #include <io.h>
 23: #include <direct.h>
 24: #endif
 25: #if defined (PARCH_win32_gnu)
 26: #include <windows.h>
 27: #endif
 28: #if defined(PETSC_HAVE_SYS_SYSTEMINFO_H)
 29: #include <sys/systeminfo.h>
 30: #endif
 31: #include "petscfix.h"

 33: #undef __FUNCT__  
 35: /*@C
 36:    PetscGetRealPath - Get the path without symbolic links etc. and in absolute form.

 38:    Not Collective

 40:    Input Parameter:
 41: .  path - path to resolve

 43:    Output Parameter:
 44: .  rpath - resolved path

 46:    Level: developer

 48:    Notes: 
 49:    rpath is assumed to be of length PETSC_MAX_PATH_LEN.

 51:    Systems that use the automounter often generate absolute paths
 52:    of the form "/tmp_mnt....".  However, the automounter will fail to
 53:    mount this path if it is not already mounted, so we remove this from
 54:    the head of the line.  This may cause problems if, for some reason,
 55:    /tmp_mnt is valid and not the result of the automounter.

 57:    Concepts: real path
 58:    Concepts: path^real

 60: .seealso: PetscGetFullPath()
 61: @*/
 62: int PetscGetRealPath(char path[],char rpath[])
 63: {
 64:   int        ierr;
 65:   char       tmp3[PETSC_MAX_PATH_LEN];
 66:   PetscTruth flg;
 67: #if !defined(PETSC_HAVE_REALPATH) && !defined(PARCH_win32) && defined(PETSC_HAVE_READLINK)
 68:   char       tmp1[PETSC_MAX_PATH_LEN],tmp4[PETSC_MAX_PATH_LEN],*tmp2;
 69:   int        n,m,N,len,len1,len2;
 70: #endif

 73: #if defined(PETSC_HAVE_REALPATH)
 74:   realpath(path,rpath);
 75: #elif defined (PARCH_win32)
 76:   PetscStrcpy(rpath,path);
 77: #elif !defined(PETSC_HAVE_READLINK)
 78:   PetscStrcpy(rpath,path);
 79: #else

 81:   /* Algorithm: we move through the path, replacing links with the real paths.   */
 82:   PetscStrcpy(rpath,path);
 83:   PetscStrlen(rpath,&N);
 84:   while (N) {
 85:     PetscStrncpy(tmp1,rpath,N);
 86:     tmp1[N] = 0;
 87:     n = readlink(tmp1,tmp3,PETSC_MAX_PATH_LEN);
 88:     if (n > 0) {
 89:       tmp3[n] = 0; /* readlink does not automatically add 0 to string end */
 90:       if (tmp3[0] != '/') {
 91:         PetscStrchr(tmp1,'/',&tmp2);
 92:         PetscStrlen(tmp1,&len1);
 93:         PetscStrlen(tmp2,&len2);
 94:         m    = len1 - len2;
 95:         PetscStrncpy(tmp4,tmp1,m);
 96:         tmp4[m] = 0;
 97:         PetscStrlen(tmp4,&len);
 98:         PetscStrncat(tmp4,"/",PETSC_MAX_PATH_LEN - len);
 99:         PetscStrlen(tmp4,&len);
100:         PetscStrncat(tmp4,tmp3,PETSC_MAX_PATH_LEN - len);
101:         PetscGetRealPath(tmp4,rpath);
102:         PetscStrlen(rpath,&len);
103:         PetscStrncat(rpath,path+N,PETSC_MAX_PATH_LEN - len);
104:       } else {
105:         PetscGetRealPath(tmp3,tmp1);
106:         PetscStrncpy(rpath,tmp1,PETSC_MAX_PATH_LEN);
107:         PetscStrlen(rpath,&len);
108:         PetscStrncat(rpath,path+N,PETSC_MAX_PATH_LEN - len);
109:       }
110:       return(0);
111:     }
112:     PetscStrchr(tmp1,'/',&tmp2);
113:     if (tmp2) {
114:       PetscStrlen(tmp1,&len1);
115:       PetscStrlen(tmp2,&len2);
116:       N    = len1 - len2;
117:     } else {
118:       PetscStrlen(tmp1,&N);
119:     }
120:   }
121:   PetscStrncpy(rpath,path,PETSC_MAX_PATH_LEN);
122: #endif

124:   /* remove garbage some automounters put at the beginning of the path */
125:   PetscStrncmp("/tmp_mnt/",rpath,9,&flg);
126:   if (flg) {
127:     PetscStrcpy(tmp3,rpath + 8);
128:     PetscStrcpy(rpath,tmp3);
129:   }
130:   return(0);
131: }