nixpkgs/pkgs/tools/text/unix2dos/unix2dos-2.2-tmppath.patch

diff -up unix2dos-2.2/unix2dos.c.tmppath unix2dos-2.2/unix2dos.c
--- unix2dos-2.2/unix2dos.c.tmppath	2008-09-08 10:14:30.000000000 +0100
+++ unix2dos-2.2/unix2dos.c	2008-09-08 10:14:30.000000000 +0100
@@ -57,7 +57,10 @@
 
 #ifdef __MSDOS__
 #  include <dir.h>
+#else
+#  include <unistd.h>
 #endif __MSDOS
+#include <libgen.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -195,6 +198,40 @@ int ConvertUnixToDos(FILE* ipInF, FILE* 
 }
 
 
+static int MakeTempFileFrom(const char *OutFN, char **fname_ret)
+{
+  char *cpy = strdup(OutFN);
+  char *dir = NULL;
+  size_t fname_len = 0;
+  char  *fname_str = NULL;
+  int fd = -1;
+  
+  *fname_ret = NULL;
+ 
+  if (!cpy)
+    goto make_failed;
+  
+  dir = dirname(cpy);
+  
+  fname_len = strlen(dir) + strlen("/u2dtmpXXXXXX") + sizeof (char);
+  if (!(fname_str = malloc(fname_len)))
+    goto make_failed;
+  sprintf(fname_str, "%s%s", dir, "/u2dtmpXXXXXX");
+  *fname_ret = fname_str;
+
+  free(cpy);
+
+  if ((fd = mkstemp(fname_str)) == -1)
+    goto make_failed;
+  
+  return (fd);
+  
+ make_failed:
+  free(*fname_ret);
+  *fname_ret = NULL;
+  return (-1);
+}
+
 /* convert file ipInFN to DOS format text and write to file ipOutFN
  * RetVal: 0 if success
  *         -1 otherwise
@@ -204,7 +241,7 @@ int ConvertUnixToDosNewFile(char *ipInFN
   int RetVal = 0;
   FILE *InF = NULL;
   FILE *TempF = NULL;
-  char TempPath[16];
+  char *TempPath;
   struct stat StatBuf;
   struct utimbuf UTimeBuf;
   int fd;
@@ -213,8 +250,7 @@ int ConvertUnixToDosNewFile(char *ipInFN
   if ((ipFlag->KeepDate) && stat(ipInFN, &StatBuf))
     RetVal = -1;
 
-  strcpy (TempPath, "./u2dtmpXXXXXX");
-  if((fd=mkstemp (TempPath)) < 0) {
+  if((fd = MakeTempFileFrom (ipOutFN, &TempPath)) < 0) {
 	  perror("Can't open output temp file");
 	  RetVal = -1;
   }
@@ -231,6 +267,7 @@ int ConvertUnixToDosNewFile(char *ipInFN
   if ((!RetVal) && (InF) && ((TempF=OpenOutFile(fd)) == NULL))
   {
     fclose (InF);
+    InF = NULL;
     RetVal = -1;
   }
 
@@ -265,9 +302,6 @@ int ConvertUnixToDosNewFile(char *ipInFN
   /* can rename temp file to out file? */
   if (!RetVal)
   {
-    if (stat(ipOutFN, &StatBuf) == 0)
-      unlink(ipOutFN);
-
     if ((rename(TempPath, ipOutFN) == -1) && (!ipFlag->Quiet))
     {
       fprintf(stderr, "unix2dos: problems renaming '%s' to '%s'\n", TempPath, ipOutFN);
@@ -275,6 +309,7 @@ int ConvertUnixToDosNewFile(char *ipInFN
       RetVal = -1;
     }
   }
+  free(TempPath);
 
   return RetVal;
 }
@@ -289,7 +324,7 @@ int ConvertUnixToDosOldFile(char* ipInFN
   int RetVal = 0;
   FILE *InF = NULL;
   FILE *TempF = NULL;
-  char TempPath[16];
+  char *TempPath;
   struct stat StatBuf;
   struct utimbuf UTimeBuf;
   mode_t mode = S_IRUSR | S_IWUSR;
@@ -301,8 +336,7 @@ int ConvertUnixToDosOldFile(char* ipInFN
   else
     mode = StatBuf.st_mode;
 
-  strcpy (TempPath, "./u2dtmpXXXXXX");
-  if((fd=mkstemp (TempPath)) < 0) {
+  if((fd = MakeTempFileFrom(ipInFN, &TempPath)) < 0) {
       perror("Can't open output temp file");
       RetVal = -1;
   }
@@ -322,6 +356,7 @@ int ConvertUnixToDosOldFile(char* ipInFN
   if ((!RetVal) && (InF) && ((TempF=OpenOutFile(fd)) == NULL))
   {
     fclose (InF);
+    InF = NULL;
     RetVal = -1;
   }
 
@@ -349,10 +384,6 @@ int ConvertUnixToDosOldFile(char* ipInFN
       RetVal = -1;
   }
 
-  /* can delete in file? */
-  if ((!RetVal) && (unlink(ipInFN) == -1))
-    RetVal = -1;
-
   /* any error? */
   if ((RetVal) && (unlink(TempPath)))
     RetVal = -1;
@@ -367,6 +398,7 @@ int ConvertUnixToDosOldFile(char* ipInFN
     }
     RetVal = -1;
   }
+  free(TempPath);
   return RetVal;
 }