diplodocus.org Git - nmh/blob - sbr/path.c

   1
   2 /*
   3  * path.c -- return a pathname
   4  *
   5  * $Id$
   6  *
   7  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  */
  11
  12 #include <h/mh.h>
  13
  14 #define CWD     "./"
  15 #define NCWD    (sizeof(CWD) - 1)
  16 #define DOT     "."
  17 #define DOTDOT  ".."
  18 #define PWD     "../"
  19 #define NPWD    (sizeof(PWD) - 1)
  20
  21 static char *pwds;
  22
  23 /*
  24  * static prototypes
  25  */
  26 static char *expath(char *,int);
  27 static void compath(char *);
  28
  29 char *
  30 pluspath(char *name)
  31 {
  32         return path(name + 1, *name == '+' ? TFOLDER : TSUBCWF);
  33 }
  34
  35 char *
  36 path(char *name, int flag)
  37 {
  38     register char *cp, *ep;
  39
  40     if ((cp = expath (name, flag))
  41             && (ep = cp + strlen (cp) - 1) > cp
  42             && *ep == '/')
  43         *ep = '\0';
  44
  45     return cp;
  46 }
  47
  48
  49 static char *
  50 expath (char *name, int flag)
  51 {
  52     register char *cp, *ep;
  53     char buffer[BUFSIZ];
  54
  55     if (flag == TSUBCWF) {
  56         snprintf (buffer, sizeof(buffer), "%s/%s", getfolder (1), name);
  57         name = m_mailpath (buffer);
  58         compath (name);
  59         snprintf (buffer, sizeof(buffer), "%s/", m_maildir (""));
  60         if (ssequal (buffer, name)) {
  61             cp = name;
  62             name = getcpy (name + strlen (buffer));
  63             free (cp);
  64         }
  65         flag = TFOLDER;
  66     }
  67
  68     if (*name == '/'
  69             || (flag == TFOLDER
  70                 && (strncmp (name, CWD, NCWD)
  71                     && strcmp (name, DOT)
  72                     && strcmp (name, DOTDOT)
  73                     && strncmp (name, PWD, NPWD))))
  74         return getcpy (name);
  75
  76     if (pwds == NULL)
  77         pwds = pwd ();
  78
  79     if (strcmp (name, DOT) == 0 || strcmp (name, CWD) == 0)
  80         return getcpy (pwds);
  81
  82     ep = pwds + strlen (pwds);
  83     if ((cp = strrchr(pwds, '/')) == NULL)
  84         cp = ep;
  85     else
  86         if (cp == pwds)
  87             cp++;
  88
  89     if (strncmp (name, CWD, NCWD) == 0)
  90         name += NCWD;
  91
  92     if (strcmp (name, DOTDOT) == 0 || strcmp (name, PWD) == 0) {
  93         snprintf (buffer, sizeof(buffer), "%.*s", (int)(cp - pwds), pwds);
  94         return getcpy (buffer);
  95     }
  96
  97     if (strncmp (name, PWD, NPWD) == 0)
  98         name += NPWD;
  99     else
 100         cp = ep;
 101
 102     snprintf (buffer, sizeof(buffer), "%.*s/%s", (int)(cp - pwds), pwds, name);
 103     return getcpy (buffer);
 104 }
 105
 106
 107 static void
 108 compath (char *f)
 109 {
 110     register char *cp, *dp;
 111
 112     if (*f != '/')
 113         return;
 114
 115     for (cp = f; *cp;)
 116         if (*cp == '/') {
 117             switch (*++cp) {
 118                 case 0:
 119                     if (--cp > f)
 120                         *cp = '\0';
 121                     break;
 122
 123                 case '/':
 124                     for (dp = cp; *dp == '/'; dp++)
 125                         continue;
 126                     strcpy (cp--, dp);
 127                     continue;
 128
 129                 case '.':
 130                     if (strcmp (cp, DOT) == 0) {
 131                         if (cp > f + 1)
 132                             cp--;
 133                         *cp = '\0';
 134                         break;
 135                     }
 136                     if (strcmp (cp, DOTDOT) == 0) {
 137                         for (cp -= 2; cp > f; cp--)
 138                             if (*cp == '/')
 139                                 break;
 140                         if (cp <= f)
 141                             cp = f + 1;
 142                         *cp = '\0';
 143                         break;
 144                     }
 145                     if (strncmp (cp, PWD, NPWD) == 0) {
 146                         for (dp = cp - 2; dp > f; dp--)
 147                             if (*dp == '/')
 148                                 break;
 149                         if (dp <= f)
 150                             dp = f;
 151                         strcpy (dp, cp + NPWD - 1);
 152                         cp = dp;
 153                         continue;
 154                     }
 155                     if (strncmp (cp, CWD, NCWD) == 0) {
 156                         strcpy (cp - 1, cp + NCWD - 1);
 157                         cp--;
 158                         continue;
 159                     }
 160                     continue;
 161
 162                 default:
 163                     cp++;
 164                     continue;
 165             }
 166             break;
 167         }
 168         else
 169             cp++;
 170 }