leavelet/fmt
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Add C11 API with type-safe formatting (#4663) (#4671)

Browse Source
This commit is contained in:
Soumik15630m
2026-02-16 20:36:32 +05:30
committed by GitHub
parent b35de87ad9
commit 1dc644e021
4 changed files with 505 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

200
include/fmt/fmt-c.h Normal file
View File

@@ -0,0 +1,200 @@
#ifndef FMT_C_H
#define FMT_C_H
#include <stddef.h>
#ifdef __cplusplus
# define _Bool bool
#endif
void fmt_error_unsupported_type_detected(void);
enum { fmt_c_max_args = 16 };
typedef enum {
fmt_err_exception = -1,
fmt_err_memory = -2,
fmt_err_invalid_arg = -3
} fmt_error;
#ifdef __cplusplus
extern "C" {
#endif
typedef enum {
fmt_int,
fmt_uint,
fmt_float,
fmt_double,
fmt_long_double,
fmt_string,
fmt_ptr,
fmt_bool,
fmt_char
} fmt_type;
typedef struct {
fmt_type type;
union {
long long i64;
unsigned long long u64;
float f32;
double f64;
long double f128;
const char* str;
const void* ptr; // Used for FMT_PTR and custom data
_Bool bool_val;
char char_val;
} value;
} fmt_arg;
int fmt_vformat(char* buffer, size_t capacity, const char* format_str,
const fmt_arg* args, size_t arg_count);
static inline fmt_arg fmt_from_int(long long x) {
fmt_arg arg;
arg.type = fmt_int;
arg.value.i64 = x;
return arg;
}
static inline fmt_arg fmt_from_uint(unsigned long long x) {
fmt_arg arg;
arg.type = fmt_uint;
arg.value.u64 = x;
return arg;
}
static inline fmt_arg fmt_from_float(float x) {
fmt_arg arg;
arg.type = fmt_float;
arg.value.f32 = x;
return arg;
}
static inline fmt_arg fmt_from_double(double x) {
fmt_arg arg;
arg.type = fmt_double;
arg.value.f64 = x;
return arg;
}
static inline fmt_arg fmt_from_long_double(long double x) {
fmt_arg arg;
arg.type = fmt_long_double;
arg.value.f128 = x;
return arg;
}
static inline fmt_arg fmt_from_str(const char* x) {
fmt_arg arg;
arg.type = fmt_string;
arg.value.str = x;
return arg;
}
static inline fmt_arg fmt_from_ptr(const void* x) {
fmt_arg arg;
arg.type = fmt_ptr;
arg.value.ptr = x;
return arg;
}
static inline fmt_arg fmt_from_bool(_Bool x) {
fmt_arg arg;
arg.type = fmt_bool;
arg.value.bool_val = x;
return arg;
}
static inline fmt_arg fmt_from_char(int x) {
fmt_arg arg;
arg.type = fmt_char;
arg.value.char_val = x;
return arg;
}
#ifdef __cplusplus
}
#endif
#ifndef __cplusplus
// Require modern MSVC with conformant preprocessor
# if defined(_MSC_VER) && (!defined(_MSVC_TRADITIONAL) || _MSVC_TRADITIONAL)
# error "C API requires MSVC 2019+ with /Zc:preprocessor flag."
# endif
# define FMT_MAKE_ARG(x) \
_Generic((x), \
_Bool: fmt_from_bool, \
char: fmt_from_char, \
unsigned char: fmt_from_uint, \
short: fmt_from_int, \
unsigned short: fmt_from_uint, \
int: fmt_from_int, \
unsigned int: fmt_from_uint, \
long: fmt_from_int, \
unsigned long: fmt_from_uint, \
long long: fmt_from_int, \
unsigned long long: fmt_from_uint, \
float: fmt_from_float, \
double: fmt_from_double, \
long double: fmt_from_long_double, \
char*: fmt_from_str, \
const char*: fmt_from_str, \
void*: fmt_from_ptr, \
const void*: fmt_from_ptr, \
default: fmt_error_unsupported_type_detected)(x)
# define FMT_CAT(a, b) FMT_CAT_(a, b)
# define FMT_CAT_(a, b) a##b
# define FMT_NARG_(_id, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, \
_13, _14, _15, _16, N, ...) \
N
# define FMT_NARG(...) \
FMT_NARG_(dummy, ##__VA_ARGS__, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, \
4, 3, 2, 1, 0)
# define FMT_MAP_0(...)
# define FMT_MAP_1(f, a) f(a)
# define FMT_MAP_2(f, a, b) f(a), f(b)
# define FMT_MAP_3(f, a, b, c) f(a), f(b), f(c)
# define FMT_MAP_4(f, a, b, c, d) f(a), f(b), f(c), f(d)
# define FMT_MAP_5(f, a, b, c, d, e) f(a), f(b), f(c), f(d), f(e)
# define FMT_MAP_6(f, a, b, c, d, e, g) f(a), f(b), f(c), f(d), f(e), f(g)
# define FMT_MAP_7(f, a, b, c, d, e, g, h) \
f(a), f(b), f(c), f(d), f(e), f(g), f(h)
# define FMT_MAP_8(f, a, b, c, d, e, g, h, i) \
f(a), f(b), f(c), f(d), f(e), f(g), f(h), f(i)
# define FMT_MAP_9(f, a, b, c, d, e, g, h, i, j) \
f(a), f(b), f(c), f(d), f(e), f(g), f(h), f(i), f(j)
# define FMT_MAP_10(f, a, b, c, d, e, g, h, i, j, k) \
f(a), f(b), f(c), f(d), f(e), f(g), f(h), f(i), f(j), f(k)
# define FMT_MAP_11(f, a, b, c, d, e, g, h, i, j, k, l) \
f(a), f(b), f(c), f(d), f(e), f(g), f(h), f(i), f(j), f(k), f(l)
# define FMT_MAP_12(f, a, b, c, d, e, g, h, i, j, k, l, m) \
f(a), f(b), f(c), f(d), f(e), f(g), f(h), f(i), f(j), f(k), f(l), f(m)
# define FMT_MAP_13(f, a, b, c, d, e, g, h, i, j, k, l, m, n) \
f(a), f(b), f(c), f(d), f(e), f(g), f(h), f(i), f(j), f(k), f(l), f(m), f(n)
# define FMT_MAP_14(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o) \
f(a), f(b), f(c), f(d), f(e), f(g), f(h), f(i), f(j), f(k), f(l), f(m), \
f(n), f(o)
# define FMT_MAP_15(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, p) \
f(a), f(b), f(c), f(d), f(e), f(g), f(h), f(i), f(j), f(k), f(l), f(m), \
f(n), f(o), f(p)
# define FMT_MAP_16(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, p, q) \
f(a), f(b), f(c), f(d), f(e), f(g), f(h), f(i), f(j), f(k), f(l), f(m), \
f(n), f(o), f(p), f(q)
# define FMT_MAP(f, ...) \
FMT_CAT(FMT_MAP_, FMT_NARG(__VA_ARGS__))(f, ##__VA_ARGS__)
# define fmt_format(buf, cap, fmt, ...) \
fmt_vformat( \
buf, cap, fmt, \
(fmt_arg[]){{fmt_int}, FMT_MAP(FMT_MAKE_ARG, ##__VA_ARGS__)} + 1, \
FMT_NARG(__VA_ARGS__))
#endif // __cplusplus
#endif // FMT_C_H