X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/720b47f2611d277684b2ec35d11dc3feedb207fe..70d794dce9ba8fbf978185ea36f2ad4198b269ee:/util.c

diff --git a/util.c b/util.c
index df60d0a0..f9985ef2 100644
--- a/util.c
+++ b/util.c
@@ -31,16 +31,73 @@ int num_waiting(int fd)
   return(len);
 }
 
+static int map_fd = -1;
+static off_t map_size = 0;
+static char *p = NULL;
+static int p_size = 0;
+static int p_offset = 0;
+static int p_len = 0;
+
+
 char *map_file(int fd,off_t len)
 {
-  char *ret = (char *)mmap(NULL,len,PROT_READ,MAP_SHARED,fd,0);
+  char *ret = NULL;
+#ifdef HAVE_MMAP
+  if (len < MAX_MAP_SIZE)
+    ret = (char *)mmap(NULL,len,PROT_READ,MAP_SHARED,fd,0);
+#endif
+  map_fd = fd;
+  map_size = len; 
   return ret;
 }
 
+char *map_ptr(char *buf,off_t offset,int len)
+{
+  if (buf)
+    return buf+offset;
+
+  if (len == 0) 
+    return NULL;
+
+  len = MIN(len,map_size-offset);
+
+  if (offset >= p_offset && 
+      offset+len <= p_offset+p_len) {
+    return (p + (offset - p_offset));
+  }
+
+  len = MAX(len,CHUNK_SIZE);
+  len = MIN(len,map_size - offset);  
+
+  if (len > p_size) {
+    if (p) free(p);
+    p = (char *)malloc(len);
+    if (!p) out_of_memory("map_ptr");
+    p_size = len;
+  }
+
+  if (lseek(map_fd,offset,SEEK_SET) != offset ||
+      read(map_fd,p,len) != len) {
+    fprintf(FERROR,"EOF in map_ptr!\n");
+    exit_cleanup(1);
+  }
+
+  p_offset = offset;
+  p_len = len;
+
+  return p; 
+}
+
+
 void unmap_file(char *buf,off_t len)
 {
+#ifdef HAVE_MMAP
   if (len > 0 && buf)
     munmap(buf,len);
+#endif
+  map_fd = -1;
+  map_size = 0;
+  p_len = 0;
 }
 
 
@@ -53,15 +110,15 @@ int piped_child(char **command,int *f_in,int *f_out)
 
   if (pipe(to_child_pipe) < 0 ||
       pipe(from_child_pipe) < 0) {
-    fprintf(stderr,"pipe: %s\n",strerror(errno));
-    exit(1);
+    fprintf(FERROR,"pipe: %s\n",strerror(errno));
+    exit_cleanup(1);
   }
 
 
   pid = fork();
   if (pid < 0) {
-    fprintf(stderr,"fork: %s\n",strerror(errno));
-    exit(1);
+    fprintf(FERROR,"fork: %s\n",strerror(errno));
+    exit_cleanup(1);
   }
 
   if (pid == 0)
@@ -70,19 +127,19 @@ int piped_child(char **command,int *f_in,int *f_out)
 	  close(to_child_pipe[1]) < 0 ||
 	  close(from_child_pipe[0]) < 0 ||
 	  dup2(from_child_pipe[1], STDOUT_FILENO) < 0) {
-	fprintf(stderr,"Failed to dup/close : %s\n",strerror(errno));
-	exit(1);
+	fprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno));
+	exit_cleanup(1);
       }
       execvp(command[0], command);
-      fprintf(stderr,"Failed to exec %s : %s\n",
+      fprintf(FERROR,"Failed to exec %s : %s\n",
 	      command[0],strerror(errno));
-      exit(1);
+      exit_cleanup(1);
     }
 
   if (close(from_child_pipe[1]) < 0 ||
       close(to_child_pipe[0]) < 0) {
-    fprintf(stderr,"Failed to close : %s\n",strerror(errno));   
-    exit(1);
+    fprintf(FERROR,"Failed to close : %s\n",strerror(errno));   
+    exit_cleanup(1);
   }
 
   *f_in = from_child_pipe[0];
@@ -94,8 +151,8 @@ int piped_child(char **command,int *f_in,int *f_out)
 
 void out_of_memory(char *str)
 {
-  fprintf(stderr,"out of memory in %s\n",str);
-  exit(1);
+  fprintf(FERROR,"out of memory in %s\n",str);
+  exit_cleanup(1);
 }