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| author | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2014-05-15 12:22:45 -0300 |
|---|---|---|
| committer | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2014-05-15 12:22:45 -0300 |
| commit | fd1672ba989d14273e9ba429518913d4a926ef6d (patch) | |
| tree | 9b3011be9ebbf24bdae9d5425831298d5c7916f6 /lapi.c | |
| parent | 1ddb251d86713b03b39250a27b268fcc8c8e3c6d (diff) | |
| download | lua-fd1672ba989d14273e9ba429518913d4a926ef6d.tar.gz lua-fd1672ba989d14273e9ba429518913d4a926ef6d.tar.bz2 lua-fd1672ba989d14273e9ba429518913d4a926ef6d.zip | |
avoid non-conformant pointer arithmetic in api check for 'lua_rotate'
Diffstat (limited to 'lapi.c')
| -rw-r--r-- | lapi.c | 6 |
1 files changed, 3 insertions, 3 deletions
| @@ -1,5 +1,5 @@ | |||
| 1 | /* | 1 | /* |
| 2 | ** $Id: lapi.c,v 2.211 2014/05/14 14:20:17 roberto Exp roberto $ | 2 | ** $Id: lapi.c,v 2.212 2014/05/14 18:32:30 roberto Exp roberto $ |
| 3 | ** Lua API | 3 | ** Lua API |
| 4 | ** See Copyright Notice in lua.h | 4 | ** See Copyright Notice in lua.h |
| 5 | */ | 5 | */ |
| @@ -204,9 +204,9 @@ LUA_API void lua_rotate (lua_State *L, int idx, int n) { | |||
| 204 | lua_lock(L); | 204 | lua_lock(L); |
| 205 | t = L->top - 1; /* end of stack segment being rotated */ | 205 | t = L->top - 1; /* end of stack segment being rotated */ |
| 206 | p = index2addr(L, idx); /* start of segment */ | 206 | p = index2addr(L, idx); /* start of segment */ |
| 207 | m = (n >= 0 ? t - n : p - n - 1); /* end of prefix */ | ||
| 208 | api_checkstackindex(L, idx, p); | 207 | api_checkstackindex(L, idx, p); |
| 209 | api_check(L, p <= m + 1 && m <= t, "invalid 'n'"); | 208 | api_check(L, (n >= 0 ? n : -n) <= (t - p + 1), "invalid 'n'"); |
| 209 | m = (n >= 0 ? t - n : p - n - 1); /* end of prefix */ | ||
| 210 | reverse(L, p, m); /* reverse the prefix with length 'n' */ | 210 | reverse(L, p, m); /* reverse the prefix with length 'n' */ |
| 211 | reverse(L, m + 1, t); /* reverse the suffix */ | 211 | reverse(L, m + 1, t); /* reverse the suffix */ |
| 212 | reverse(L, p, t); /* reverse the entire segment */ | 212 | reverse(L, p, t); /* reverse the entire segment */ |