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

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