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Amend sanitization of format strings. Support ' without stb_printf. Simpler loops, will also be used for ImStrv branch. (8ee77f1) (#3604)

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Widgets: Sliders: Fix a bug where numbers after format specifier (eg. %d123) would cause RoundScalarWithFormatT() return incorrect value.
This commit is contained in:
ocornut 2021-03-05 18:26:30 +01:00
parent 8ee77f1b65
commit e842b196df
1 changed files with 23 additions and 24 deletions
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47
imgui_widgets.cpp
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@ -2077,37 +2077,36 @@ static const char* ImAtoi(const char* src, TYPE* output)
return src;
}
// Sanitize format
// - Zero terminate so extra characters after format (e.g. "%f123") don't confuse atof/atoi
// - stb_sprintf.h supports several new modifiers which format numbers in a way that also makes them incompatible atof/atoi.
static void SanitizeFormatString(const char* fmt, char* fmt_out, size_t fmt_out_size)
{
const char* fmt_end = ImParseFormatFindEnd(fmt);
IM_ASSERT((size_t)(fmt_end - fmt + 1) < fmt_out_size); // Format is too long, let us know if this happens to you!
while (fmt < fmt_end)
{
char c = *(fmt++);
if (c != '\'' && c != '$' && c != '_') // Custom flags provided by stb_sprintf.h. POSIX 2008 also supports '.
*(fmt_out++) = c;
}
*fmt_out = 0; // Zero-terminate
}
template<typename TYPE, typename SIGNEDTYPE>
TYPE ImGui::RoundScalarWithFormatT(const char* format, ImGuiDataType data_type, TYPE v)
{
const char* fmt_start = ImParseFormatFindStart(format);
if (fmt_start[0] != '%' || fmt_start[1] == '%') // Don't apply if the value is not visible in the format string
return v;
// Sanitize format
char fmt_sanitized[32];
SanitizeFormatString(fmt_start, fmt_sanitized, IM_ARRAYSIZE(fmt_sanitized));
fmt_start = fmt_sanitized;
// Format value with our rounding, and read back
char v_str[64];
char fmt[32];
const char* fmt_end = ImParseFormatFindEnd(fmt_start);
IM_ASSERT(fmt_end - fmt_start < IM_ARRAYSIZE(fmt) && "Number format is too long!");
#ifdef IMGUI_USE_STB_SPRINTF
// stb_sprintf.h supports several new modifiers which format numbers in a way that makes them incompatible with
// ImAtof()/ImAtoi(). Copy format string omitting incompatible modifiers and anything past the end of format specifier.
int fmt_len = 0;
for (int i = 0, end = fmt_end - fmt_start; i < end; i++)
{
char c = fmt_start[i];
if (c == '\'' || c == '$' || c == '_') // Custom flags provided by stb_sprintf.h
continue;
fmt[fmt_len++] = c;
}
fmt[fmt_len] = 0;
fmt_start = fmt;
#else
// Extra characters after format specifier may confuse ImAtof()/ImAtoi(), therefore copying is performed, excluding anything beyond.
if (*fmt_end != 0)
{
ImStrncpy(fmt, fmt_start, fmt_end - fmt_start + 1);
fmt_start = fmt;
}
#endif
ImFormatString(v_str, IM_ARRAYSIZE(v_str), fmt_start, v);
const char* p = v_str;
while (*p == ' ')