fixup: apply the change on more files

5 files changed, 23 insertions, 23 deletions

diff --git a/src/nvim/os/env.c b/src/nvim/os/env.c
index 5a79004c41..4689414559 100644
--- a/src/nvim/os/env.c
+++ b/src/nvim/os/env.c
@@ -63,13 +63,13 @@ const char *os_getenv(const char *name)
   FUNC_ATTR_NONNULL_ALL
 {
   char *e = NULL;
-  if (name[0] == '\0') {
+  if (name[0] == NUL) {
     return NULL;
   }
   int r = 0;
   if (map_has(cstr_t, &envmap, name)
       && !!(e = (char *)pmap_get(cstr_t)(&envmap, name))) {
-    if (e[0] != '\0') {
+    if (e[0] != NUL) {
       // Found non-empty cached env var.
       // NOTE: This risks incoherence if an in-process library changes the
       //       environment without going through our os_setenv() wrapper.  If
@@ -85,11 +85,11 @@ const char *os_getenv(const char *name)
   if (r == UV_ENOBUFS) {
     e = xmalloc(size);
     r = uv_os_getenv(name, e, &size);
-    if (r != 0 || size == 0 || e[0] == '\0') {
+    if (r != 0 || size == 0 || e[0] == NUL) {
       XFREE_CLEAR(e);
       goto end;
     }
-  } else if (r != 0 || size == 0 || buf[0] == '\0') {
+  } else if (r != 0 || size == 0 || buf[0] == NUL) {
     e = NULL;
     goto end;
   } else {
@@ -110,7 +110,7 @@ end:
 bool os_env_exists(const char *name)
   FUNC_ATTR_NONNULL_ALL
 {
-  if (name[0] == '\0') {
+  if (name[0] == NUL) {
     return false;
   }
   // Use a tiny buffer because we don't care about the value: if uv_os_getenv()
@@ -134,14 +134,14 @@ bool os_env_exists(const char *name)
 int os_setenv(const char *name, const char *value, int overwrite)
   FUNC_ATTR_NONNULL_ALL
 {
-  if (name[0] == '\0') {
+  if (name[0] == NUL) {
     return -1;
   }
 #ifdef MSWIN
   if (!overwrite && os_getenv(name) != NULL) {
     return 0;
   }
-  if (value[0] == '\0') {
+  if (value[0] == NUL) {
     // Windows (Vim-compat): Empty string undefines the env var.
     return os_unsetenv(name);
   }
@@ -174,7 +174,7 @@ int os_setenv(const char *name, const char *value, int overwrite)
 int os_unsetenv(const char *name)
   FUNC_ATTR_NONNULL_ALL
 {
-  if (name[0] == '\0') {
+  if (name[0] == NUL) {
     return -1;
   }
   pmap_del2(&envmap, name);
@@ -366,7 +366,7 @@ void os_get_hostname(char *hostname, size_t size)
   struct utsname vutsname;
 
   if (uname(&vutsname) < 0) {
-    *hostname = '\0';
+    *hostname = NUL;
   } else {
     xstrlcpy(hostname, vutsname.nodename, size);
   }
@@ -374,12 +374,12 @@ void os_get_hostname(char *hostname, size_t size)
   wchar_t host_utf16[MAX_COMPUTERNAME_LENGTH + 1];
   DWORD host_wsize = sizeof(host_utf16) / sizeof(host_utf16[0]);
   if (GetComputerNameW(host_utf16, &host_wsize) == 0) {
-    *hostname = '\0';
+    *hostname = NUL;
     DWORD err = GetLastError();
     semsg("GetComputerNameW failed: %d", err);
     return;
   }
-  host_utf16[host_wsize] = '\0';
+  host_utf16[host_wsize] = NUL;
 
   char *host_utf8;
   int conversion_result = utf16_to_utf8(host_utf16, -1, &host_utf8);
@@ -391,7 +391,7 @@ void os_get_hostname(char *hostname, size_t size)
   xfree(host_utf8);
 #else
   emsg("os_get_hostname failed: missing uname()");
-  *hostname = '\0';
+  *hostname = NUL;
 #endif
 }
 
@@ -885,9 +885,9 @@ void vim_get_prefix_from_exepath(char *exe_name)
   // but c_grammar.lua does not recognize it (yet).
   xstrlcpy(exe_name, get_vim_var_str(VV_PROGPATH), MAXPATHL * sizeof(*exe_name));
   char *path_end = path_tail_with_sep(exe_name);
-  *path_end = '\0';  // remove the trailing "nvim.exe"
+  *path_end = NUL;  // remove the trailing "nvim.exe"
   path_end = path_tail(exe_name);
-  *path_end = '\0';  // remove the trailing "bin/"
+  *path_end = NUL;  // remove the trailing "bin/"
 }
 
 /// Vim getenv() wrapper with special handling of $HOME, $VIM, $VIMRUNTIME,
diff --git a/src/nvim/os/fs.c b/src/nvim/os/fs.c
index 13e87a1ca5..b681b2f832 100644
--- a/src/nvim/os/fs.c
+++ b/src/nvim/os/fs.c
@@ -302,7 +302,7 @@ static bool is_executable_ext(const char *name, char **abspath)
   char *nameext = strrchr(name, '.');
   size_t nameext_len = nameext ? strlen(nameext) : 0;
   xstrlcpy(os_buf, name, sizeof(os_buf));
-  char *buf_end = xstrchrnul(os_buf, '\0');
+  char *buf_end = xstrchrnul(os_buf, NUL);
   const char *pathext = os_getenv("PATHEXT");
   if (!pathext) {
     pathext = ".com;.exe;.bat;.cmd";
@@ -310,7 +310,7 @@ static bool is_executable_ext(const char *name, char **abspath)
   const char *ext = pathext;
   while (*ext) {
     // If $PATHEXT itself contains dot:
-    if (ext[0] == '.' && (ext[1] == '\0' || ext[1] == ENV_SEPCHAR)) {
+    if (ext[0] == '.' && (ext[1] == NUL || ext[1] == ENV_SEPCHAR)) {
       if (is_executable(name, abspath)) {
         return true;
       }
@@ -436,7 +436,7 @@ FILE *os_fopen(const char *path, const char *flags)
   assert(flags != NULL && strlen(flags) > 0 && strlen(flags) <= 2);
   int iflags = 0;
   // Per table in fopen(3) manpage.
-  if (flags[1] == '\0' || flags[1] == 'b') {
+  if (flags[1] == NUL || flags[1] == 'b') {
     switch (flags[0]) {
     case 'r':
       iflags = O_RDONLY;
diff --git a/src/nvim/os/pty_process_win.c b/src/nvim/os/pty_process_win.c
index f73baed490..39c3966c1c 100644
--- a/src/nvim/os/pty_process_win.c
+++ b/src/nvim/os/pty_process_win.c
@@ -399,7 +399,7 @@ static int build_env_block(dict_T *denv, wchar_t **env_block)
     QUEUE_INSERT_TAIL(&env_q, &env_node->node);
   }
 
-  // Additional '\0' after the final entry
+  // Additional NUL after the final entry
   env_block_len++;
 
   *env_block = xmalloc(sizeof(**env_block) * env_block_len);
diff --git a/src/nvim/os/shell.c b/src/nvim/os/shell.c
index d572e9b933..026f14ebc8 100644
--- a/src/nvim/os/shell.c
+++ b/src/nvim/os/shell.c
@@ -648,13 +648,13 @@ char *shell_argv_to_str(char **const argv)
     p++;
   }
   if (n < maxsize) {
-    rv[n - 1] = '\0';
+    rv[n - 1] = NUL;
   } else {
     // Command too long, show ellipsis: "/bin/bash 'foo' 'bar'..."
     rv[maxsize - 4] = '.';
     rv[maxsize - 3] = '.';
     rv[maxsize - 2] = '.';
-    rv[maxsize - 1] = '\0';
+    rv[maxsize - 1] = NUL;
   }
   return rv;
 }
@@ -861,7 +861,7 @@ static int do_os_system(char **argv, const char *input, size_t len, char **outpu
 {
   out_data_decide_throttle(0);  // Initialize throttle decider.
   out_data_ring(NULL, 0);       // Initialize output ring-buffer.
-  bool has_input = (input != NULL && input[0] != '\0');
+  bool has_input = (input != NULL && input[0] != NUL);
 
   // the output buffer
   DynamicBuffer buf = DYNAMIC_BUFFER_INIT;
@@ -1024,7 +1024,7 @@ static bool out_data_decide_throttle(size_t size)
   static uint64_t started = 0;  // Start time of the current throttle.
   static size_t received = 0;  // Bytes observed since last throttle.
   static size_t visit = 0;  // "Pulse" count of the current throttle.
-  static char pulse_msg[] = { ' ', ' ', ' ', '\0' };
+  static char pulse_msg[] = { ' ', ' ', ' ', NUL };
 
   if (!size) {
     bool previous_decision = (visit > 0);
diff --git a/src/nvim/os/stdpaths.c b/src/nvim/os/stdpaths.c
index e5bdd56fe6..e4435bcaa8 100644
--- a/src/nvim/os/stdpaths.c
+++ b/src/nvim/os/stdpaths.c
@@ -69,7 +69,7 @@ static const char *const xdg_defaults[] = {
 const char *get_appname(void)
 {
   const char *env_val = os_getenv("NVIM_APPNAME");
-  if (env_val == NULL || *env_val == '\0') {
+  if (env_val == NULL || *env_val == NUL) {
     env_val = "nvim";
   }
   return env_val;