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Easy redefinition of valid flags for 'string.format'

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This commit is contained in:
Roberto Ierusalimschy 2019-10-17 13:02:07 -03:00
parent 6c0e44464b
commit 6055a039b5
1 changed files with 6 additions and 3 deletions
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9
lstrlib.c
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@ -1071,7 +1071,10 @@ static int lua_number2strx (lua_State *L, char *buff, int sz,
/* valid flags in a format specification */
#define FLAGS "-+ #0"
#if !defined(L_FMTFLAGS)
#define L_FMTFLAGS "-+ #0"
#endif
/*
** maximum size of each format specification (such as "%-099.99d")
@ -1169,8 +1172,8 @@ static void addliteral (lua_State *L, luaL_Buffer *b, int arg) {
static const char *scanformat (lua_State *L, const char *strfrmt, char *form) {
const char *p = strfrmt;
while (*p != '\0' && strchr(FLAGS, *p) != NULL) p++; /* skip flags */
if ((size_t)(p - strfrmt) >= sizeof(FLAGS)/sizeof(char))
while (*p != '\0' && strchr(L_FMTFLAGS, *p) != NULL) p++; /* skip flags */
if ((size_t)(p - strfrmt) >= sizeof(L_FMTFLAGS)/sizeof(char))
luaL_error(L, "invalid format (repeated flags)");
if (isdigit(uchar(*p))) p++; /* skip width */
if (isdigit(uchar(*p))) p++; /* (2 digits at most) */