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SDL_vsnprintf: fix numerics if both zero-padding and a field are given. 

it used to place zeroes between the sign and the number. (space-padding
from within SDL_PrintString() seems OK:  spaces are added before sign.)

also fixed the maxlen handling if the number has a sign.
Ozkan Sezer 2018-09-29 00:51:24 +03:00
parent 5454765a22
commit 49803c8660
1 changed files with 20 additions and 4 deletions
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24
src/stdlib/SDL_string.c
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@ -1416,15 +1416,19 @@ SDL_PrintString(char *text, size_t maxlen, SDL_FormatInfo *info, const char *str
static void static void
SDL_IntPrecisionAdjust(char *num, size_t maxlen, SDL_FormatInfo *info) SDL_IntPrecisionAdjust(char *num, size_t maxlen, SDL_FormatInfo *info)
{/* left-pad num with zeroes. */ {/* left-pad num with zeroes. */
size_t sz, pad; size_t sz, pad, have_sign;
if (!info || info->precision < 0) if (!info)
return; return;
if (*num == '-') have_sign = 0;
if (*num == '-' || *num == '+') {
have_sign = 1;
++num; ++num;
--maxlen;
}
sz = SDL_strlen(num); sz = SDL_strlen(num);
if (sz < (size_t)info->precision) { if (info->precision > 0 && sz < (size_t)info->precision) {
pad = (size_t)info->precision - sz; pad = (size_t)info->precision - sz;
if (pad + sz + 1 <= maxlen) { /* otherwise ignore the precision */ if (pad + sz + 1 <= maxlen) { /* otherwise ignore the precision */
SDL_memmove(num + pad, num, sz + 1); SDL_memmove(num + pad, num, sz + 1);
@ -1432,6 +1436,18 @@ SDL_IntPrecisionAdjust(char *num, size_t maxlen, SDL_FormatInfo *info)
} }
} }
info->precision = -1;/* so that SDL_PrintString() doesn't make a mess. */ info->precision = -1;/* so that SDL_PrintString() doesn't make a mess. */
if (info->pad_zeroes && info->width > 0 && (size_t)info->width > sz + have_sign) {
/* handle here: spaces are added before the sign
but zeroes must be placed _after_ the sign. */
/* sz hasn't changed: we ignore pad_zeroes if a precision is given. */
pad = (size_t)info->width - sz - have_sign;
if (pad + sz + 1 <= maxlen) {
SDL_memmove(num + pad, num, sz + 1);
SDL_memset(num, '0', pad);
}
info->width = 0; /* so that SDL_PrintString() doesn't make a mess. */
}
} }
static size_t static size_t