From: Francois Fleuret <francois@fleuret.org>
Date: Thu, 18 Mar 2010 08:23:08 +0000 (+0100)
Subject: Changed all the sprintf into snprintf, removed an unused routine.
X-Git-Url: https://www.fleuret.org/cgi-bin/gitweb/gitweb.cgi?p=dus.git;a=commitdiff_plain;h=eca27b58c4fbc0a771edf635ccc726eb89699589

Changed all the sprintf into snprintf, removed an unused routine.
---

diff --git a/dus.c b/dus.c
index d361712..08cd183 100644
--- a/dus.c
+++ b/dus.c
@@ -88,21 +88,6 @@ int ignore_entry(const char *name) {
     (ignore_dotfiles && name[0] == '.');
 }
 
-void print_size_sum(size_sum_t s) {
-  char tmp[128];
-  char *a = tmp + sizeof(tmp)/sizeof(char);
-  *(--a) = '\0';
-  if(s) {
-    while(s) {
-      *(--a) = s%10 + '0';
-      s /= 10;
-    }
-  } else {
-    *(--a) = '0';
-  }
-  printf("%s", a);
-}
-
 size_sum_t entry_size(const char *name) {
   DIR *dir;
   struct dirent *dir_e;
@@ -219,18 +204,18 @@ int compare_files(const void *x1, const void *x2) {
   }
 }
 
-void raw_print(char *buffer, char *filename,  size_sum_t size) {
+void raw_print(char *buffer, size_t buffer_size, char *filename,  size_sum_t size) {
   char *a, *b, *c, u;
 
   b = buffer;
-  if(size) {
-    while(size) {
-      *(b++) = size%10 + '0';
-      size /= 10;
+  do {
+    if(b >= buffer + buffer_size) {
+      fprintf(stderr, "Buffer overflow in raw_print (hu?!).\n");
+      exit(EXIT_FAILURE);
     }
-  } else {
-    *(b++) = '0';
-  }
+    *(b++) = size%10 + '0';
+    size /= 10;
+  } while(size);
 
   a = buffer;
   c = b;
@@ -242,30 +227,34 @@ void raw_print(char *buffer, char *filename,  size_sum_t size) {
 
   *(b++) = ' ';
 
-  sprintf(b, "%s\n", filename);
+  snprintf(b, buffer_size - (b - buffer), "%s\n", filename);
 }
 
-void fancy_print(char *buffer, char *filename, size_sum_t size) {
+void fancy_print(char *buffer, size_t buffer_size, char *filename, size_sum_t size) {
   if(size < 1024) {
-    sprintf(buffer,
-            "% 7d -- %s\n",
-            ((int) size),
-            filename);
+    snprintf(buffer,
+             buffer_size,
+             "% 7d -- %s\n",
+             ((int) size),
+             filename);
   } else if(size < 1024 * 1024) {
-    sprintf(buffer,
-            "% 6.1fK -- %s\n",
-            ((double) (size))/(1024.0),
-            filename);
+    snprintf(buffer,
+             buffer_size,
+             "% 6.1fK -- %s\n",
+             ((double) (size))/(1024.0),
+             filename);
   } else if(size < 1024 * 1024 * 1024) {
-    sprintf(buffer,
-            "% 6.1fM -- %s\n",
-            ((double) (size))/(1024.0 * 1024),
-            filename);
+    snprintf(buffer,
+             buffer_size,
+             "% 6.1fM -- %s\n",
+             ((double) (size))/(1024.0 * 1024),
+             filename);
   } else {
-    sprintf(buffer,
-            "% 6.1fG -- %s\n",
-            ((double) (size))/(1024.0 * 1024.0 * 1024.0),
-            filename);
+    snprintf(buffer,
+             buffer_size,
+             "% 6.1fG -- %s\n",
+             ((double) (size))/(1024.0 * 1024.0 * 1024.0),
+             filename);
   }
 }
 
@@ -318,11 +307,16 @@ void print_sorted(struct entry_node *root, int width, int height) {
     first = nb_nodes - n;
   }
 
+  /* I do not like valgrind to complain about uninitialized data */
+  if(width < BUFFER_SIZE) {
+    line[width] = '\0';
+  }
+
   for(n = first; n < last; n++) {
     if(fancy_size_display) {
-      fancy_print(line, nodes[n]->name, nodes[n]->size);
+      fancy_print(line, BUFFER_SIZE, nodes[n]->name, nodes[n]->size);
     } else {
-      raw_print(line, nodes[n]->name, nodes[n]->size);
+      raw_print(line, BUFFER_SIZE, nodes[n]->name, nodes[n]->size);
     }
     if(width >= 1 && width + 1 < BUFFER_SIZE && line[width]) {
       line[width] = '\n';