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makedep: Copy the makefile to append dependencies instead of truncating in place.

oldstable
Alexandre Julliard 2009-01-12 14:43:15 +01:00
parent f885d40d67
commit c31a36412c
1 changed files with 50 additions and 9 deletions
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57
tools/makedep.c
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@ -865,6 +865,33 @@ static int output_src( FILE *file, INCL_FILE *pFile, int *column )
} }
/*******************************************************************
* create_temp_file
*/
static FILE *create_temp_file( char **tmp_name )
{
char *name = xmalloc( strlen(OutputFileName) + 13 );
unsigned int i, id = getpid();
int fd;
FILE *ret = NULL;
for (i = 0; i < 100; i++)
{
sprintf( name, "%s.tmp%08x", OutputFileName, id );
if ((fd = open( name, O_RDWR | O_CREAT | O_EXCL, 0600 )) != -1)
{
ret = fdopen( fd, "w" );
break;
}
if (errno != EEXIST) break;
id += 7777;
}
if (!ret) fatal_error( "failed to create output file for '%s'\n", OutputFileName );
*tmp_name = name;
return ret;
}
/******************************************************************* /*******************************************************************
* output_dependencies * output_dependencies
*/ */
@ -873,19 +900,23 @@ static void output_dependencies(void)
INCL_FILE *pFile; INCL_FILE *pFile;
int i, column; int i, column;
FILE *file = NULL; FILE *file = NULL;
char *buffer; char *tmp_name = NULL;
if (Separator && ((file = fopen( OutputFileName, "r+" )))) if (Separator && ((file = fopen( OutputFileName, "r" ))))
{ {
while ((buffer = get_line( file ))) char buffer[1024];
FILE *tmp_file = create_temp_file( &tmp_name );
while (fgets( buffer, sizeof(buffer), file ))
{ {
if (strncmp( buffer, Separator, strlen(Separator) )) continue; if (fwrite( buffer, 1, strlen(buffer), tmp_file ) != strlen(buffer))
ftruncate( fileno(file), ftell(file) ); fatal_error( "error writing to %s\n", tmp_name );
fseek( file, 0L, SEEK_END ); if (!strncmp( buffer, Separator, strlen(Separator) )) break;
break;
} }
fclose( file );
file = tmp_file;
} }
if (!file) else
{ {
if (!(file = fopen( OutputFileName, Separator ? "a" : "w" ))) if (!(file = fopen( OutputFileName, Separator ? "a" : "w" )))
{ {
@ -903,6 +934,16 @@ static void output_dependencies(void)
fprintf( file, "\n" ); fprintf( file, "\n" );
} }
fclose( file ); fclose( file );
if (tmp_name)
{
if (rename( tmp_name, OutputFileName ) == -1)
{
unlink( tmp_name );
fatal_error( "failed to rename output file to '%s'\n", OutputFileName );
}
free( tmp_name );
}
} }