1: #define PETSC_DLL

 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(PETSC_HAVE_SYS_UTSNAME_H)
 18: #include <sys/utsname.h>
 19: #endif
 20: #if defined(PETSC_HAVE_SYS_SYSTEMINFO_H)
 21: #include <sys/systeminfo.h>
 22: #endif
 23: #include "petscfix.h"

 27: /*@C
 28:    PetscGetRealPath - Get the path without symbolic links etc. and in absolute form.

 30:    Not Collective

 32:    Input Parameter:
 33: .  path - path to resolve

 35:    Output Parameter:
 36: .  rpath - resolved path

 38:    Level: developer

 40:    Notes: 
 41:    rpath is assumed to be of length PETSC_MAX_PATH_LEN.

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

 49:    Concepts: real path
 50:    Concepts: path^real

 52: .seealso: PetscGetFullPath()
 53: @*/
 54: PetscErrorCode  PetscGetRealPath(char path[],char rpath[])
 55: {
 57:   char           tmp3[PETSC_MAX_PATH_LEN];
 58:   PetscTruth     flg;
 59: #if !defined(PETSC_HAVE_REALPATH) && defined(PETSC_HAVE_READLINK)
 60:   char           tmp1[PETSC_MAX_PATH_LEN],tmp4[PETSC_MAX_PATH_LEN],*tmp2;
 61:   size_t         N,len,len1,len2;
 62:   int            n,m;
 63: #endif

 66: #if defined(PETSC_HAVE_REALPATH)
 67:   realpath(path,rpath);
 68: #elif defined(PETSC_HAVE_READLINK)
 69:   /* Algorithm: we move through the path, replacing links with the real paths.   */
 70:   PetscStrcpy(rpath,path);
 71:   PetscStrlen(rpath,&N);
 72:   while (N) {
 73:     PetscStrncpy(tmp1,rpath,N);
 74:     tmp1[N] = 0;
 75:     n = readlink(tmp1,tmp3,PETSC_MAX_PATH_LEN);
 76:     if (n > 0) {
 77:       tmp3[n] = 0; /* readlink does not automatically add 0 to string end */
 78:       if (tmp3[0] != '/') {
 79:         PetscStrchr(tmp1,'/',&tmp2);
 80:         PetscStrlen(tmp1,&len1);
 81:         PetscStrlen(tmp2,&len2);
 82:         m    = len1 - len2;
 83:         PetscStrncpy(tmp4,tmp1,m);
 84:         tmp4[m] = 0;
 85:         PetscStrlen(tmp4,&len);
 86:         PetscStrncat(tmp4,"/",PETSC_MAX_PATH_LEN - len);
 87:         PetscStrlen(tmp4,&len);
 88:         PetscStrncat(tmp4,tmp3,PETSC_MAX_PATH_LEN - len);
 89:         PetscGetRealPath(tmp4,rpath);
 90:         PetscStrlen(rpath,&len);
 91:         PetscStrncat(rpath,path+N,PETSC_MAX_PATH_LEN - len);
 92:       } else {
 93:         PetscGetRealPath(tmp3,tmp1);
 94:         PetscStrncpy(rpath,tmp1,PETSC_MAX_PATH_LEN);
 95:         PetscStrlen(rpath,&len);
 96:         PetscStrncat(rpath,path+N,PETSC_MAX_PATH_LEN - len);
 97:       }
 98:       return(0);
 99:     }
100:     PetscStrchr(tmp1,'/',&tmp2);
101:     if (tmp2) {
102:       PetscStrlen(tmp1,&len1);
103:       PetscStrlen(tmp2,&len2);
104:       N    = len1 - len2;
105:     } else {
106:       PetscStrlen(tmp1,&N);
107:     }
108:   }
109:   PetscStrncpy(rpath,path,PETSC_MAX_PATH_LEN);
110: #else /* Just punt */
111:   PetscStrcpy(rpath,path);
112: #endif

114:   /* remove garbage some automounters put at the beginning of the path */
115:   PetscStrncmp("/tmp_mnt/",rpath,9,&flg);
116:   if (flg) {
117:     PetscStrcpy(tmp3,rpath + 8);
118:     PetscStrcpy(rpath,tmp3);
119:   }
120:   return(0);
121: }