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getenv: return NULL if empty #2574

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Making an environment variable empty can be a way of unsetting it for
platforms that don't support unsetenv(). In most cases, we treat empty
variables as having been unset. For all others, use os_env_exists().
This commit is contained in:
Scott Prager
2015-05-03 09:25:53 -04:00
parent fa0f122221
commit 412d246be7
10 changed files with 67 additions and 60 deletions
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7
src/nvim/option.c
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@@ -1727,7 +1727,7 @@ void set_init_1(void)
p_cp = FALSE;
/* Use POSIX compatibility when $VIM_POSIX is set. */
if (os_getenv("VIM_POSIX") != NULL) {
if (os_env_exists("VIM_POSIX")) {
set_string_default("cpo", (char_u *)CPO_ALL);
set_string_default("shm", (char_u *)"A");
}
@@ -1736,8 +1736,7 @@ void set_init_1(void)
* Find default value for 'shell' option.
* Don't use it if it is empty.
*/
if (((p = (char_u *)os_getenv("SHELL")) != NULL && *p != NUL)
)
if ((p = (char_u *)os_getenv("SHELL")) != NULL)
set_string_default("sh", p);
/*
@@ -1926,7 +1925,7 @@ void set_init_1(void)
* NOTE: mlterm's author is being asked to 'set' a variable
* instead of an environment variable due to inheritance.
*/
if (os_getenv("MLTERM") != NULL)
if (os_env_exists("MLTERM"))
set_option_value((char_u *)"tbidi", 1L, NULL, 0);
/* Parse default for 'fillchars'. */