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Amend sanitization of format strings. Support ' without stb_printf. Simpler loops, will also be used for ImStrv branch. (8ee77f1
) (#3604)
Widgets: Sliders: Fix a bug where numbers after format specifier (eg. %d123) would cause RoundScalarWithFormatT() return incorrect value.
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8ee77f1b65
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@ -2077,37 +2077,36 @@ static const char* ImAtoi(const char* src, TYPE* output)
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return src;
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}
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// Sanitize format
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// - Zero terminate so extra characters after format (e.g. "%f123") don't confuse atof/atoi
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// - stb_sprintf.h supports several new modifiers which format numbers in a way that also makes them incompatible atof/atoi.
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static void SanitizeFormatString(const char* fmt, char* fmt_out, size_t fmt_out_size)
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{
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const char* fmt_end = ImParseFormatFindEnd(fmt);
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IM_ASSERT((size_t)(fmt_end - fmt + 1) < fmt_out_size); // Format is too long, let us know if this happens to you!
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while (fmt < fmt_end)
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{
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char c = *(fmt++);
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if (c != '\'' && c != '$' && c != '_') // Custom flags provided by stb_sprintf.h. POSIX 2008 also supports '.
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*(fmt_out++) = c;
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}
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*fmt_out = 0; // Zero-terminate
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}
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template<typename TYPE, typename SIGNEDTYPE>
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TYPE ImGui::RoundScalarWithFormatT(const char* format, ImGuiDataType data_type, TYPE v)
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{
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const char* fmt_start = ImParseFormatFindStart(format);
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if (fmt_start[0] != '%' || fmt_start[1] == '%') // Don't apply if the value is not visible in the format string
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return v;
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// Sanitize format
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char fmt_sanitized[32];
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SanitizeFormatString(fmt_start, fmt_sanitized, IM_ARRAYSIZE(fmt_sanitized));
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fmt_start = fmt_sanitized;
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// Format value with our rounding, and read back
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char v_str[64];
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char fmt[32];
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const char* fmt_end = ImParseFormatFindEnd(fmt_start);
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IM_ASSERT(fmt_end - fmt_start < IM_ARRAYSIZE(fmt) && "Number format is too long!");
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#ifdef IMGUI_USE_STB_SPRINTF
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// stb_sprintf.h supports several new modifiers which format numbers in a way that makes them incompatible with
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// ImAtof()/ImAtoi(). Copy format string omitting incompatible modifiers and anything past the end of format specifier.
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int fmt_len = 0;
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for (int i = 0, end = fmt_end - fmt_start; i < end; i++)
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{
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char c = fmt_start[i];
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if (c == '\'' || c == '$' || c == '_') // Custom flags provided by stb_sprintf.h
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continue;
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fmt[fmt_len++] = c;
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}
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fmt[fmt_len] = 0;
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fmt_start = fmt;
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#else
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// Extra characters after format specifier may confuse ImAtof()/ImAtoi(), therefore copying is performed, excluding anything beyond.
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if (*fmt_end != 0)
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{
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ImStrncpy(fmt, fmt_start, fmt_end - fmt_start + 1);
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fmt_start = fmt;
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}
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#endif
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ImFormatString(v_str, IM_ARRAYSIZE(v_str), fmt_start, v);
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const char* p = v_str;
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while (*p == ' ')
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