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lua/executor: Make stricmp function work with strings with NULs

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ZyX 2017-08-15 16:30:32 +03:00
parent 44dc8bbb13
commit ef6641ba69
1 changed files with 30 additions and 3 deletions
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33
src/nvim/lua/executor.c
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@ -124,9 +124,36 @@ static void nlua_error(lua_State *const lstate, const char *const msg)
/// omitted.
static int nlua_stricmp(lua_State *const lstate) FUNC_ATTR_NONNULL_ALL
{
const char *s1 = luaL_checklstring(lstate, 1, NULL);
const char *s2 = luaL_checklstring(lstate, 2, NULL);
const int ret = STRICMP(s1, s2);
size_t s1_len;
size_t s2_len;
const char *s1 = luaL_checklstring(lstate, 1, &s1_len);
const char *s2 = luaL_checklstring(lstate, 2, &s2_len);
char *nul1;
char *nul2;
int ret = 0;
assert(s1[s1_len] == NUL);
assert(s2[s2_len] == NUL);
do {
nul1 = memchr(s1, NUL, s1_len);
nul2 = memchr(s2, NUL, s2_len);
ret = STRICMP(s1, s2);
// Compare "a\0" greater then "a".
if (ret == 0 && (nul1 == NULL) != (nul2 == NULL)) {
ret = ((nul1 != NULL) - (nul2 != NULL));
break;
}
if (nul1 != NULL) {
assert(nul2 != NULL);
// Due to lowercase letter having possibly different byte length then
// uppercase letter can’t shift both strings by the same amount of bytes.
s1_len -= (size_t)(nul1 - s1) + 1;
s2_len -= (size_t)(nul2 - s2) + 1;
s1 = nul1 + 1;
s2 = nul2 + 1;
} else {
break;
}
} while (ret == 0);
lua_pop(lstate, 2);
lua_pushnumber(lstate, (lua_Number)((ret > 0) - (ret < 0)));
return 1;