Actual source code: fpath.c
petsc-3.13.6 2020-09-29
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      2:  #include <petscsys.h>
      3: #if defined(PETSC_HAVE_PWD_H)
      4: #include <pwd.h>
      5: #endif

      7: /*@C
      8:    PetscGetFullPath - Given a filename, returns the fully qualified file name.

     10:    Not Collective

     12:    Input Parameters:
     13: +  path     - pathname to qualify
     14: .  fullpath - pointer to buffer to hold full pathname
     15: -  flen     - size of fullpath

     17:    Level: developer

     20: .seealso: PetscGetRelativePath()
     21: @*/
     22: PetscErrorCode  PetscGetFullPath(const char path[],char fullpath[],size_t flen)
     23: {
     25:   size_t         ln;
     26:   PetscBool      flg;

     29:   if (path[0] == '/') {
     30:     PetscStrncmp("/tmp_mnt/",path,9,&flg);
     31:     if (flg) {PetscStrncpy(fullpath,path + 8,flen);}
     32:     else     {PetscStrncpy(fullpath,path,flen);}
     33:     fullpath[flen-1] = 0;
     34:     return(0);
     35:   }

     37:   PetscStrncpy(fullpath,path,flen);
     38:   fullpath[flen-1] = 0;
     39:   /* Remove the various "special" forms (~username/ and ~/) */
     40:   if (fullpath[0] == '~') {
     41:     char tmppath[PETSC_MAX_PATH_LEN],*rest;
     42:     if (fullpath[1] == '/') {
     43:       PetscGetHomeDirectory(tmppath,PETSC_MAX_PATH_LEN);
     44:       rest = fullpath + 2;
     45:     } else {
     46: #if defined(PETSC_HAVE_PWD_H)
     47:       struct passwd  *pwde;
     48:       char *p,*name;

     50:       /* Find username */
     51:       name = fullpath + 1;
     52:       p    = name;
     53:       while (*p && *p != '/') p++;
     54:       *p   = 0;
     55:       rest = p + 1;
     56:       pwde = getpwnam(name);
     57:       if (!pwde) return(0);

     59:       PetscStrcpy(tmppath,pwde->pw_dir);
     60: #else
     61:       return(0);
     62: #endif
     63:     }
     64:     PetscStrlen(tmppath,&ln);
     65:     if (tmppath[ln-1] != '/') {PetscStrcat(tmppath+ln-1,"/");}
     66:     PetscStrcat(tmppath,rest);
     67:     PetscStrncpy(fullpath,tmppath,flen);
     68:     fullpath[flen-1] = 0;
     69:   } else {
     70:     PetscGetWorkingDirectory(fullpath,flen);
     71:     PetscStrlen(fullpath,&ln);
     72:     PetscStrncpy(fullpath+ln,"/",flen - ln);
     73:     fullpath[flen-1] = 0;
     74:     PetscStrlen(fullpath,&ln);
     75:     if (path[0] == '.' && path[1] == '/') {
     76:       PetscStrlcat(fullpath,path+2,flen);
     77:     } else {
     78:       PetscStrlcat(fullpath,path,flen);
     79:     }
     80:     fullpath[flen-1] = 0;
     81:   }

     83:   /* Remove the automounter part of the path */
     84:   PetscStrncmp(fullpath,"/tmp_mnt/",9,&flg);
     85:   if (flg) {
     86:     char tmppath[PETSC_MAX_PATH_LEN];
     87:     PetscStrcpy(tmppath,fullpath + 8);
     88:     PetscStrcpy(fullpath,tmppath);
     89:   }
     90:   /* We could try to handle things like the removal of .. etc */
     91:   return(0);
     92: }