sim: ppc: drop build-config.h usage

[thirdparty/binutils-gdb.git] / sim / ppc / lf.c

diff --git a/sim/ppc/lf.c b/sim/ppc/lf.c
index 1794a27f35099c1fe7b41fbb3e680ed70df756ab..9a9d6151c6e8c6f4001f93f2851aa91ba58b755d 100644 (file)
--- a/sim/ppc/lf.c
+++ b/sim/ppc/lf.c
@@ -17,33 +17,25 @@
 
     */
 
-
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdarg.h>
 #include <ctype.h>
 
-#include "build-config.h"
 #include "misc.h"
 #include "lf.h"
 
-#ifdef HAVE_STDLIB_H
 #include <stdlib.h>
-#endif
-
-#ifdef HAVE_STRING_H
 #include <string.h>
-#else
-#ifdef HAVE_STRINGS_H
-#include <strings.h>
-#endif
-#endif
 
 struct _lf {
   FILE *stream;
   int line_nr; /* nr complete lines written, curr line is line_nr+1 */
   int indent;
   int line_blank;
-  const char *name;
+  const char *name;            /* Output name with diagnostics.  */
+  const char *filename;                /* Output filename.  */
+  char *tmpname;               /* Temporary output filename.  */
   const char *program;
   lf_file_references references;
   lf_file_type type;
@@ -51,8 +43,8 @@ struct _lf {
 
 
 lf *
-lf_open(char *name,
-       char *real_name,
+lf_open(const char *name,
+       const char *real_name,
        lf_file_references references,
        lf_file_type type,
        const char *program)
@@ -63,6 +55,7 @@ lf_open(char *name,
   new_lf->references = references;
   new_lf->type = type;
   new_lf->name = (real_name == NULL ? name : real_name);
+  new_lf->filename = name;
   new_lf->program = program;
   /* attach to stdout if pipe */
   if (!strcmp(name, "-")) {
@@ -70,7 +63,11 @@ lf_open(char *name,
   }
   else {
     /* create a new file */
-    new_lf->stream = fopen(name, "w");
+    char *tmpname = zalloc (strlen (name) + 5);
+    sprintf (tmpname, "%s.tmp", name);
+    new_lf->filename = name;
+    new_lf->tmpname = tmpname;
+    new_lf->stream = fopen(tmpname, "w+");
     if (new_lf->stream == NULL) {
       perror(name);
       exit(1);
@@ -83,13 +80,73 @@ lf_open(char *name,
 void
 lf_close(lf *file)
 {
-  if (file->stream != stdout) {
-    if (fclose(file->stream)) {
-      perror("lf_close.fclose");
-      exit(1);
+  FILE *fp;
+  bool update = true;
+
+  /* If we wrote to stdout, no house keeping needed.  */
+  if (file->stream == stdout)
+    return;
+
+  /* Rename the temp file to the real file if it's changed.  */
+  fp = fopen (file->filename, "r");
+  if (fp != NULL)
+    {
+      off_t len;
+
+      fseek (fp, 0, SEEK_END);
+      len = ftell (fp);
+
+      if (len == ftell (file->stream))
+       {
+         off_t off;
+         size_t cnt;
+         char *oldbuf = zalloc (len);
+         char *newbuf = zalloc (len);
+
+         rewind (fp);
+         off = 0;
+         while ((cnt = fread (oldbuf + off, 1, len - off, fp)) > 0)
+           off += cnt;
+         ASSERT (off == len);
+
+         rewind (file->stream);
+         off = 0;
+         while ((cnt = fread (newbuf + off, 1, len - off, file->stream)) > 0)
+           off += cnt;
+         ASSERT (off == len);
+
+         if (memcmp (oldbuf, newbuf, len) == 0)
+           update = false;
+       }
+
+      fclose (fp);
     }
-    free(file);
-  }
+
+  if (fclose (file->stream))
+    {
+      perror ("lf_close.fclose");
+      exit (1);
+    }
+
+  if (update)
+    {
+      if (rename (file->tmpname, file->filename) != 0)
+       {
+         perror ("lf_close.rename");
+         exit (1);
+       }
+    }
+  else
+    {
+      if (remove (file->tmpname) != 0)
+       {
+         perror ("lf_close.unlink");
+         exit (1);
+       }
+    }
+
+  free (file->tmpname);
+  free (file);
 }