From 3ea6dbfe7364cfb1b8ef63defb263b687a2d8bd1 Mon Sep 17 00:00:00 2001
From: Campbell Barton <campbell@blender.org>
Date: Tue, 26 Apr 2022 13:45:59 +1000
Subject: Cleanup: simplify text copying string operations

- De-duplicate txt_new_linen & txt_new_line.
- Don't accept NULL as input for txt_new_linen & txt_new_line
  (callers can pass in an empty string instead).
- Avoid duplicate strlen calls in txt_new_linen.
- Use memcpy when the length of the string is known in txt_delete_sel &
  BKE_text_load_ex.
---
 source/blender/blenkernel/intern/text.c | 42 ++++++++++++---------------------
 1 file changed, 15 insertions(+), 27 deletions(-)

(limited to 'source/blender/blenkernel')

diff --git a/source/blender/blenkernel/intern/text.c b/source/blender/blenkernel/intern/text.c
index 9d8a97c90b8..1ab4c9614de 100644
--- a/source/blender/blenkernel/intern/text.c
+++ b/source/blender/blenkernel/intern/text.c
@@ -484,8 +484,9 @@ Text *BKE_text_load_ex(Main *bmain, const char *file, const char *relpath, const
   }
 
   if (is_internal == false) {
-    ta->filepath = MEM_mallocN(strlen(file) + 1, "text_name");
-    strcpy(ta->filepath, file);
+    const size_t file_len = strlen(file);
+    ta->filepath = MEM_mallocN(file_len + 1, "text_name");
+    memcpy(ta->filepath, file, file_len + 1);
   }
   else {
     ta->flags |= TXT_ISMEM | TXT_ISDIRTY;
@@ -605,40 +606,27 @@ static void make_new_line(TextLine *line, char *newline)
   line->format = NULL;
 }
 
-static TextLine *txt_new_line(const char *str)
+static TextLine *txt_new_linen(const char *str, int str_len)
 {
   TextLine *tmp;
 
-  if (!str) {
-    str = "";
-  }
-
   tmp = (TextLine *)MEM_mallocN(sizeof(TextLine), "textline");
-  tmp->line = MEM_mallocN(strlen(str) + 1, "textline_string");
+  tmp->line = MEM_mallocN(str_len + 1, "textline_string");
   tmp->format = NULL;
 
-  strcpy(tmp->line, str);
-
-  tmp->len = strlen(str);
+  memcpy(tmp->line, str, str_len);
+  tmp->line[str_len] = '\0';
+  tmp->len = str_len;
   tmp->next = tmp->prev = NULL;
 
+  BLI_assert(strlen(tmp->line) == str_len);
+
   return tmp;
 }
 
-static TextLine *txt_new_linen(const char *str, int n)
+static TextLine *txt_new_line(const char *str)
 {
-  TextLine *tmp;
-
-  tmp = (TextLine *)MEM_mallocN(sizeof(TextLine), "textline");
-  tmp->line = MEM_mallocN(n + 1, "textline_string");
-  tmp->format = NULL;
-
-  BLI_strncpy(tmp->line, (str) ? str : "", n + 1);
-
-  tmp->len = strlen(tmp->line);
-  tmp->next = tmp->prev = NULL;
-
-  return tmp;
+  return txt_new_linen(str, strlen(str));
 }
 
 void txt_clean_text(Text *text)
@@ -650,7 +638,7 @@ void txt_clean_text(Text *text)
       text->lines.first = text->lines.last;
     }
     else {
-      text->lines.first = text->lines.last = txt_new_line(NULL);
+      text->lines.first = text->lines.last = txt_new_line("");
     }
   }
 
@@ -1234,8 +1222,8 @@ static void txt_delete_sel(Text *text)
 
   buf = MEM_mallocN(text->curc + (text->sell->len - text->selc) + 1, "textline_string");
 
-  strncpy(buf, text->curl->line, text->curc);
-  strcpy(buf + text->curc, text->sell->line + text->selc);
+  memcpy(buf, text->curl->line, text->curc);
+  memcpy(buf + text->curc, text->sell->line + text->selc, text->sell->len - text->selc);
   buf[text->curc + (text->sell->len - text->selc)] = 0;
 
   make_new_line(text->curl, buf);
-- 
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