format.h

#pragma once
 
#include <cx/container/sarray.h>
#include <cx/cx.h>
#include <cx/stype/stvar.h>
 
 
CX_C bool _strFormat(_Inout_ string* out, _In_ strref fmt, int n, _In_ stvar* args);
 
#define strFormat(out, fmt, ...) \
    _strFormat(out, fmt, count_macro_args(__VA_ARGS__), (stvar[]) { __VA_ARGS__ })
 
// strFormat previously used the sizeof((stvariant[]){ __VA_ARGS__ })/sizeof(stvar)
// contruction to count the arguments, but this caused MSVC to allocate double the stack
// space and push duplicate argument lists for no reason! Falling back to the old school
// macro trick instead.
 
 
enum FMTVarFlags {
    FMTVar_NoGenCase  = 0x0001,     
    FMTVar_NoGenWidth = 0x0002,     
 
    FMTVar_SignPrefix   = 0x0010,   
    FMTVar_SignAlways   = 0x0020,   
    FMTVar_LeadingZeros = 0x0040,   
 
    FMTVar_Left   = 0x0100,         
    FMTVar_Center = 0x0200,         
    FMTVar_Right  = 0x0400,         
    FMTVar_Upper  = 0x0800,         
    FMTVar_Lower  = 0x1000,         
 
    // type-specific flags may use 0x00010000 - 0xffff0000
};
 
typedef struct FMTVar {
    string var;           
    int32 vtype;          
    int32 idx;            
    int32 width;          
    sa_string fmtopts;    
    string def;           
    string tmp;           
 
    int32 arrayidx;       
    string hashkey;       
 
    uint32 flags;         
    uintptr fmtdata[4];   
 
    stype type;           
    void* data;           
} FMTVar;