dmake/path.c

   1 /* RCS  $Id: path.c,v 1.6 2008-03-05 18:29:34 kz Exp $
   2 --
   3 -- SYNOPSIS
   4 --      Pathname manipulation code
   5 --
   6 -- DESCRIPTION
   7 --  Pathname routines to handle building and pulling appart
   8 --  pathnames.
   9 --
  10 -- AUTHOR
  11 --      Dennis Vadura, dvadura@dmake.wticorp.com
  12 --
  13 -- WWW
  14 --      http://dmake.wticorp.com/
  15 --
  16 -- COPYRIGHT
  17 --      Copyright (c) 1996,1997 by WTI Corp.  All rights reserved.
  18 --
  19 --      This program is NOT free software; you can redistribute it and/or
  20 --      modify it under the terms of the Software License Agreement Provided
  21 --      in the file <distribution-root>/readme/license.txt.
  22 --
  23 -- LOG
  24 --      Use cvs log to obtain detailed change logs.
  25 */
  26
  27 #include "extern.h"
  28 #if __CYGWIN__
  29 #include <sys/cygwin.h>
  30 #include <errno.h>
  31 #endif
  32
  33
  34 /*
  35 ** Return the suffix portion of a filename, assumed to begin with a `.'.
  36 */
  37 PUBLIC char *
  38 Get_suffix(name)
  39 char *name;
  40 {
  41    char *suff;
  42
  43    if(name == NIL(char)  || (suff = strrchr(name, '.')) == NIL(char))
  44       suff = ".NULL";
  45
  46    return (suff);
  47 }
  48
  49
  50 PUBLIC char *
  51 Basename(path)/*
  52 ================
  53    Return pointer to the basename part of path. path itself remains
  54    unchanged. */
  55 char *path;
  56 {
  57    char *p;
  58    char *q;
  59
  60    if( path && *(q = path) ) {
  61       for(; *(p=DmStrPbrk(q, DirBrkStr)) != '\0'; q = p+1 );
  62       if( !*q ) {
  63      for( p=q-1; p != path; --p )
  64         if( strchr( DirBrkStr, *p ) == NIL(char) ) return( p+1 );
  65      return( strchr(DirBrkStr, *p)?path:(p+1) );
  66       }
  67       path = q;
  68    }
  69    return( path );
  70 }
  71
  72
  73 PUBLIC char *
  74 Filedir(path)
  75 char *path;
  76 {
  77    char *p;
  78    char *q;
  79
  80    if( path && *(q = path) ) {
  81       for(; *(p=DmStrPbrk(q,DirBrkStr)) != '\0'; q=p+1 );
  82
  83       if (q == path) return("");
  84
  85       for(p=q-1; p!=path; --p)
  86      if( strchr(DirBrkStr,*p) == NIL(char) )
  87         break;
  88
  89       p[1] = '\0';
  90    }
  91
  92    return(path);
  93 }
  94
  95
  96
  97 PUBLIC char *
  98 Build_path(dir, name)/*
  99 =======================
 100    Return a path that is created by concatenating dir and name. A directory
 101    separater is added between them if needed. If dir is empty name is stripped
 102    of leading slashes (if there) and returned.
 103
 104    The returned path is also cleaned from unneeded './' and 'foo/../'
 105    elements and also multiple consequtive '/' are removed.
 106
 107    Note, the returned path is built in a static buffer, if it is to be used
 108    later strdup should be used on the result returned by Build_path to create
 109    a copy. */
 110
 111 char *dir;
 112 char *name;
 113 {
 114    static char     *path  = NIL(char);
 115    static unsigned buflen = 0;
 116    int  plen = 0;
 117    int  dlen = 0;
 118    int  len;
 119
 120    DB_ENTER( "Build_path" );
 121
 122    if( dir  != NIL(char) ) dlen = strlen( dir  );
 123    if( name != NIL(char) ) plen = strlen( name );
 124    len = plen+dlen+1+1; /* Reserve space for extra path separator. */
 125
 126    if( len > buflen ) {
 127       buflen = (len+16) & ~0xf;     /* buf is always multiple of 16 */
 128
 129       if( path == NIL(char) )
 130          path = MALLOC( buflen, char );
 131       else
 132          path = realloc( path, (unsigned) (buflen*sizeof(char)) );
 133    }
 134
 135    *path = '\0';
 136
 137    if( dlen ) {
 138       strcpy( path, dir );
 139       if( *path && strchr(DirBrkStr, dir[dlen-1]) == NIL(char) )
 140      strcat( path, DirSepStr );
 141    }
 142
 143    if ( plen ) {
 144       while ( *name && strchr(DirBrkStr,*name) != 0 ) name++;
 145       strcat( path, name );
 146    }
 147
 148    DB_PRINT( "path", ("dir: %s  name: %s", dir, name ));
 149    DB_PRINT( "path", ("joined to: %s", path ));
 150
 151    Clean_path( path );
 152    DB_PRINT( "path", ("cleaned to: %s", path ));
 153
 154    DB_RETURN( path );
 155 }
 156
 157
 158 void
 159 Clean_path(path)/*
 160 ==================
 161    Clean the path from irregular directory separators (if more than one are
 162    allowed), remove unneeded './' and 'foo/../' elements and also multiple
 163    consequtive '/'.
 164
 165    The resulting string is shorter than the original, therefore this function
 166    works on the original string. */
 167
 168 char *path;
 169 {
 170    register char *p;
 171    register char *q;
 172    char *tpath;
 173    int hasdriveletter = 0;
 174    int delentry;
 175    size_t len;
 176
 177    DB_ENTER( "Clean_path" );
 178
 179    /* Skip the root part. */
 180    tpath=path;
 181
 182 #ifdef HAVE_DRIVE_LETTERS
 183
 184    /* Change all occurrences from DirBrkStr to *DirSepStr. This assumes
 185     * that when HAVE_DRIVE_LETTERS is set the directory separator is
 186     * either '\' or '/'. */
 187    if (*DirSepStr == '/')
 188       for( q = tpath; (q = strchr(q, '\\')) != NIL(char); )
 189          *q = *DirSepStr;
 190    else
 191       for( q = tpath; (q = strchr(q, '/')) != NIL(char); )
 192          *q = *DirSepStr;
 193
 194    /* The following dosn't trigger often because normalize_path() uses
 195     * a cygwin function and bypasses Clean_path() if it encounters a path
 196     * with a drive letter. */
 197    if( *tpath && tpath[1] == ':' && isalpha(*tpath) ) {
 198       hasdriveletter = 1;
 199       tpath+=2;
 200       if( *tpath != *DirSepStr )
 201      Warning("Malformed DOS path %s", path);
 202    }
 203
 204 #endif
 205
 206    /* Collapse > 2 ( > 1 if its an absolute DOS path ) into one slash.
 207     * Keep // as it is reserved in posix. */
 208    q = tpath;
 209    for( ; *q == *DirSepStr ; ++q )
 210       ;
 211    if( q - tpath > 2 - hasdriveletter ) {
 212       strcpy(tpath+1, q);
 213    }
 214
 215    /* Set tpath after leading slash / drive letter. */
 216    for( ; *tpath == *DirSepStr ; ++tpath )
 217       ;
 218    q = tpath;
 219
 220    while( *q ) {
 221       char *t;
 222
 223       /* p is NULL or greater than q. */
 224       p=strchr(q, *DirSepStr);
 225       if( !p ) break;
 226
 227       /* Remove multiple consequtive DirSepStr. */
 228       if( p[1] == *DirSepStr ) {
 229      t = p++; /* t points to first, p to second DirStrSep. */
 230      /* Move p after the second (or possible more) DirSepStr. */
 231      do {
 232         p++;
 233      }
 234      while( *p == *DirSepStr);
 235      len = strlen(p)+1;
 236      memmove(t+1,p,len);
 237      continue;
 238       }
 239
 240       /* Remove './'. If OOODMAKEMODE is set do this only if it is not at
 241        * the start of the path. */
 242       if ( p-q == 1 && *q == '.' && (q != path || !STOBOOL(OOoDmMode)) ) {
 243      len = strlen(p+1)+1;
 244      memmove(q,p+1,len);
 245      q = tpath;
 246      continue;
 247       }
 248
 249       /* If two '/' are in path check/remove 'foo/../' elements. */
 250       t=strchr(p+1, *DirSepStr);
 251       if( !t ) break;
 252
 253       /* Collaps this only if foo is neither '.' nor '..'. */
 254       switch( p-q ) {
 255      case 2:
 256         delentry = !((q[0] == '.') && (q[1] == '.'));
 257         break;
 258      case 1:
 259         delentry = !(q[0] == '.');
 260         break;
 261      default:
 262         delentry = TRUE;
 263         break;
 264       }
 265
 266       if ( delentry
 267        && (t-p-1 == 2 && strncmp(p+1,"..",2) == 0) ) {
 268      /* Skip one (or possible more) DirSepStr. */
 269      do {
 270         t++;
 271      }
 272      while( *t == *DirSepStr);
 273      /* q points to first letter of the current directory/file. */
 274      len = strlen(t)+1;
 275      memmove(q,t,len);
 276      q = tpath;
 277       }
 278       else
 279      q = p+1;
 280    }
 281
 282    DB_PRINT( "path", ("Cleaned path: %s", path ));
 283
 284    DB_VOID_RETURN;
 285 }
 286
 287
 288 char *
 289 normalize_path(path)/*
 290 =======================
 291    Normalize the given path unless it contains a $ indicating a dynamic
 292    prerequisite.
 293    Special case: For absolute DOSish paths under cygwin a cygwin API
 294    function is used to normalize the path optherwise Clean_path() is used.
 295
 296    Note, the returned path is built in a static buffer, if it is to be used
 297    later a copy should be created. */
 298
 299 char *path;
 300 {
 301    static char *cpath = NIL(char);
 302
 303    DB_ENTER( "normalize_path" );
 304
 305    if ( !cpath && ( (cpath = MALLOC( PATH_MAX, char)) == NIL(char) ) )
 306       No_ram();
 307
 308    /* If there is a $ in the path this can either mean a '$' character in
 309     * a target definition or a dynamic macro expression in a prerequisite
 310     * list. As dynamic macro expression must not be normalized and is
 311     * indistinguishable from a literal $ characters at this point we skip
 312     * the normalization if a $ is found.  */
 313    if( strchr(path, '$') ) {
 314       DB_RETURN( path );
 315    }
 316
 317 #if __CYGWIN__
 318    /* Use cygwin function to convert a DOS path to a POSIX path. */
 319    if( *path && path[1] == ':' && isalpha(*path) ) {
 320       int err = cygwin_conv_to_posix_path(path, cpath);
 321       if (err)
 322      Fatal( "error converting \"%s\" - %s\n",
 323         path, strerror (errno));
 324       if( path[2] != '/' && path[2] != '\\' )
 325      Warning("Malformed DOS path %s converted to %s", path, cpath);
 326    }
 327    else
 328 #endif
 329    {
 330       strcpy( cpath, path );
 331       Clean_path( cpath );
 332    }
 333
 334    DB_PRINT( "path", ("normalized: %s", cpath ));
 335
 336    DB_RETURN( cpath );
 337 }