vim-patch:9.1.1151: too many strlen() calls in getchar.c

Problem:  too many strlen() calls in getchar.c
Solution: store last inserted and recorded lengths,
          add functions to retrieve those and use those
          functions (John Marriott)

closes: vim/vim#16720

https://github.com/vim/vim/commit/d3c4b7e9461f90bad7a671c1221d65def9cccc89

Co-authored-by: John Marriott <basilisk@internode.on.net>

3 files changed, 36 insertions, 15 deletions

diff --git a/src/nvim/edit.c b/src/nvim/edit.c
index af3471184d..223b0acbc0 100644
--- a/src/nvim/edit.c
+++ b/src/nvim/edit.c
@@ -339,7 +339,7 @@ static void insert_enter(InsertState *s)
   if (s->ptr == NULL) {
     new_insert_skip = 0;
   } else {
-    new_insert_skip = (int)strlen(s->ptr);
+    new_insert_skip = (int)get_inserted_len();
     xfree(s->ptr);
   }
 
@@ -2342,7 +2342,7 @@ static void stop_insert(pos_T *end_insert_pos, int esc, int nomove)
   // Don't do it when "restart_edit" was set and nothing was inserted,
   // otherwise CTRL-O w and then <Left> will clear "last_insert".
   char *ptr = get_inserted();
-  int added = ptr == NULL ? 0 : (int)strlen(ptr) - new_insert_skip;
+  int added = ptr == NULL ? 0 : (int)get_inserted_len() - new_insert_skip;
   if (did_restart_edit == 0 || added > 0) {
     xfree(last_insert);
     last_insert = ptr;
@@ -2772,8 +2772,8 @@ char *get_last_insert_save(void)
   if (last_insert == NULL) {
     return NULL;
   }
-  char *s = xstrdup(last_insert + last_insert_skip);
-  int len = (int)strlen(s);
+  size_t len = strlen(last_insert + last_insert_skip);
+  char *s = xmemdupz(last_insert + last_insert_skip, len);
   if (len > 0 && s[len - 1] == ESC) {         // remove trailing ESC
     s[len - 1] = NUL;
   }
diff --git a/src/nvim/getchar.c b/src/nvim/getchar.c
index 0817d40bb8..abdc83eb3d 100644
--- a/src/nvim/getchar.c
+++ b/src/nvim/getchar.c
@@ -155,6 +155,11 @@ static uint8_t noremapbuf_init[TYPELEN_INIT];  ///< initial typebuf.tb_noremap
 
 static size_t last_recorded_len = 0;  ///< number of last recorded chars
 
+static size_t last_get_recorded_len = 0;  ///< length of the string returned from the
+                                          ///< last call to get_recorded()
+static size_t last_get_inserted_len = 0;  ///< length of the string returned from the
+                                          ///< last call to get_inserted()
+
 enum {
   KEYLEN_PART_KEY = -1,  ///< keylen value for incomplete key-code
   KEYLEN_PART_MAP = -2,  ///< keylen value for incomplete mapping
@@ -225,31 +230,48 @@ static char *get_buffcont(buffheader_T *buffer, int dozero, size_t *len)
 /// K_SPECIAL in the returned string is escaped.
 char *get_recorded(void)
 {
-  size_t len;
-  char *p = get_buffcont(&recordbuff, true, &len);
+  char *p = get_buffcont(&recordbuff, true, &last_get_recorded_len);
+  if (p == NULL) {
+    return NULL;
+  }
+
   free_buff(&recordbuff);
 
   // Remove the characters that were added the last time, these must be the
   // (possibly mapped) characters that stopped the recording.
-  if (len >= last_recorded_len) {
-    len -= last_recorded_len;
-    p[len] = NUL;
+  if (last_get_recorded_len >= last_recorded_len) {
+    last_get_recorded_len -= last_recorded_len;
+    p[last_get_recorded_len] = NUL;
   }
 
   // When stopping recording from Insert mode with CTRL-O q, also remove the
   // CTRL-O.
-  if (len > 0 && restart_edit != 0 && p[len - 1] == Ctrl_O) {
-    p[len - 1] = NUL;
+  if (last_get_recorded_len > 0 && restart_edit != 0
+      && p[last_get_recorded_len - 1] == Ctrl_O) {
+    last_get_recorded_len--;
+    p[last_get_recorded_len] = NUL;
   }
 
   return p;
 }
 
+/// Return the length of string returned from the last call of get_recorded().
+size_t get_recorded_len(void)
+{
+  return last_get_recorded_len;
+}
+
 /// Return the contents of the redo buffer as a single string.
 /// K_SPECIAL in the returned string is escaped.
 char *get_inserted(void)
 {
-  return get_buffcont(&redobuff, false, NULL);
+  return get_buffcont(&redobuff, false, &last_get_inserted_len);
+}
+
+/// Return the length of string returned from the last call of get_inserted().
+size_t get_inserted_len(void)
+{
+  return last_get_inserted_len;
 }
 
 /// Add string after the current block of the given buffer
diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index 72c75534d4..f60a6d50c9 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -1039,7 +1039,7 @@ int do_record(int c)
       // restore the current register name.
       yankreg_T *old_y_previous = y_previous;
 
-      retval = stuff_yank(regname, p);
+      retval = stuff_yank(regname, p, get_recorded_len());
 
       y_previous = old_y_previous;
     }
@@ -1051,7 +1051,7 @@ int do_record(int c)
 /// uppercase). "p" must have been allocated.
 ///
 /// @return  FAIL for failure, OK otherwise
-static int stuff_yank(int regname, char *p)
+static int stuff_yank(int regname, char *p, size_t plen)
 {
   // check for read-only register
   if (regname != 0 && !valid_yank_reg(regname, true)) {
@@ -1063,7 +1063,6 @@ static int stuff_yank(int regname, char *p)
     return OK;
   }
 
-  const size_t plen = strlen(p);
   yankreg_T *reg = get_yank_register(regname, YREG_YANK);
   if (is_append_register(regname) && reg->y_array != NULL) {
     String *pp = &(reg->y_array[reg->y_size - 1]);