File dos2unix-bnc#488261-dont_destroy_original.patch of Package dos2unix

Index: dos2unix.c
===================================================================
--- dos2unix.c.orig
+++ dos2unix.c
@@ -69,6 +69,7 @@ static int macmode = 0;
 #ifdef __MSDOS__
 #  include <dir.h>
 #endif __MSDOS__
+#include <libgen.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -247,6 +248,39 @@ int ConvertDosToUnix(FILE* ipInF, FILE* 
     return RetVal;
 }
 
+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("/d2utmpXXXXXX") + sizeof (char);
+  if (!(fname_str = malloc(fname_len)))
+    goto make_failed;
+  sprintf(fname_str, "%s%s", dir, "/d2utmpXXXXXX");
+  *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 UNIX format text and write to file ipOutFN
  * RetVal: 0 if success
@@ -257,7 +291,7 @@ int ConvertDosToUnixNewFile(char *ipInFN
   int RetVal = 0;
   FILE *InF = NULL;
   FILE *TempF = NULL;
-  char TempPath[16];
+  char *TempPath;
   struct stat StatBuf;
   struct utimbuf UTimeBuf;
   int fd;
@@ -266,8 +300,7 @@ int ConvertDosToUnixNewFile(char *ipInFN
   if ((ipFlag->KeepDate) && stat(ipInFN, &StatBuf))
     RetVal = -1;
 
-  strcpy (TempPath, "./d2utmpXXXXXX");
-  if((fd=mkstemp (TempPath))<0) {
+  if((fd = MakeTempFileFrom(ipOutFN, &TempPath))<0) {
 	  perror("Failed to open output temp file");
 	  RetVal = -1;
   }
@@ -284,6 +317,7 @@ int ConvertDosToUnixNewFile(char *ipInFN
   if ((!RetVal) && (InF) && ((TempF=OpenOutFile(fd)) == NULL))
   {
     fclose (InF);
+    InF = NULL;
     RetVal = -1;
   }
 
@@ -317,9 +351,6 @@ int ConvertDosToUnixNewFile(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, "dos2unix: problems renaming '%s' to '%s'\n", TempPath, ipOutFN);
@@ -327,6 +358,7 @@ int ConvertDosToUnixNewFile(char *ipInFN
       RetVal = -1;
     }
   }
+  free(TempPath);
   return RetVal;
 }
 
@@ -342,7 +374,7 @@ int ConvertDosToUnixOldFile(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;
@@ -354,8 +386,7 @@ int ConvertDosToUnixOldFile(char* ipInFN
   else
     mode = StatBuf.st_mode;
 
-  strcpy (TempPath, "./u2dtmpXXXXXX");
-  if((fd=mkstemp (TempPath))<0) {
+  if((fd = MakeTempFileFrom(ipInFN, &TempPath))<0) {
 	  perror("Failed to open output temp file");
 	  RetVal = -1;
   }
@@ -375,6 +406,7 @@ int ConvertDosToUnixOldFile(char* ipInFN
   if ((!RetVal) && (InF) && ((TempF=OpenOutFile(fd)) == NULL))
   {
     fclose (InF);
+    InF = NULL;
     RetVal = -1;
   }
 
@@ -402,10 +434,6 @@ int ConvertDosToUnixOldFile(char* ipInFN
       RetVal = -1;
   }
 
-  /* can delete in file? */
-  if ((!RetVal) && (unlink(ipInFN) == -1))
-    RetVal = -1;
-
   /* any error? */
   if ((RetVal) && (unlink(TempPath)))
     RetVal = -1;
@@ -420,6 +448,7 @@ int ConvertDosToUnixOldFile(char* ipInFN
     }
     RetVal = -1;
   }
+  free(TempPath);
   return RetVal;
 }