dmake/unix/bsd43/tempnam.c

   1 /* RCS  $Id: tempnam.c,v 1.1.1.1 2000-09-22 15:33:34 hr Exp $
   2 --
   3 -- SYNOPSIS
   4 --      tempnam
   5 --
   6 -- DESCRIPTION
   7 --      temp file name generation routines.
   8 --
   9 -- AUTHOR
  10 --      Dennis Vadura, dvadura@dmake.wticorp.com
  11 --
  12 -- WWW
  13 --      http://dmake.wticorp.com/
  14 --
  15 -- COPYRIGHT
  16 --      Copyright (c) 1996,1997 by WTI Corp.  All rights reserved.
  17 --
  18 --      This program is NOT free software; you can redistribute it and/or
  19 --      modify it under the terms of the Software License Agreement Provided
  20 --      in the file <distribution-root>/readme/license.txt.
  21 --
  22 -- LOG
  23 --      Use cvs log to obtain detailed change logs.
  24 */
  25
  26 /*LINTLIBRARY*/
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30
  31 #define max(A,B) (((A)<(B))?(B):(A))
  32
  33 extern char *mktemp();
  34 extern int access();
  35
  36 static char *cpdir();
  37 static char  seed[4]="AAA";
  38
  39 /* BSD stdio.h doesn't define P_tmpdir, so let's do it here */
  40 #ifndef P_tmpdir
  41 static char *P_tmpdir = "/tmp";
  42 #endif
  43
  44 char *
  45 tempnam(dir, prefix)
  46 char *dir;              /* use this directory please (if non-NULL) */
  47 char *prefix;           /* use this (if non-NULL) as filename prefix */
  48 {
  49    register char *p, *q, *tmpdir;
  50    int            tl=0, dl=0, pl;
  51
  52    pl = strlen(P_tmpdir);
  53
  54    if( (tmpdir = getenv("TMPDIR")) != NULL ) tl = strlen(tmpdir);
  55    if( dir != NULL ) dl = strlen(dir);
  56
  57    if( (p = malloc((unsigned)(max(max(dl,tl),pl)+16))) == NULL )
  58      return(NULL);
  59
  60    *p = '\0';
  61
  62    if( (tl == 0) || (access( cpdir(p, tmpdir), 3) != 0) )
  63      if( (dl == 0) || (access( cpdir(p, dir), 3) != 0) )
  64     if( access( cpdir(p, P_tmpdir),   3) != 0 )
  65        if( access( cpdir(p, "/tmp"),  3) != 0 )
  66           return(NULL);
  67
  68    (void) strcat(p, "/");
  69    if(prefix)
  70    {
  71       *(p+strlen(p)+5) = '\0';
  72       (void)strncat(p, prefix, 5);
  73    }
  74
  75    (void)strcat(p, seed);
  76    (void)strcat(p, "XXXXXX");
  77
  78    q = seed;
  79    while(*q == 'Z') *q++ = 'A';
  80    ++*q;
  81
  82    if(*mktemp(p) == '\0') return(NULL);
  83    return(p);
  84 }
  85
  86
  87
  88 static char *
  89 cpdir(buf, str)
  90 char *buf;
  91 char *str;
  92 {
  93    char *p;
  94
  95    if(str != NULL)
  96    {
  97       (void) strcpy(buf, str);
  98       p = buf - 1 + strlen(buf);
  99       if(*p == '/') *p = '\0';
 100    }
 101
 102    return(buf);
 103 }