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Better support for variadic functions

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cozis
2025-09-22 15:11:50 +02:00
parent 4f239166c7
commit 6487384e4e
8 changed files with 417 additions and 71 deletions
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src/main.c
+153 -9
View File
@@ -111,7 +111,8 @@ CWEB_VArg cweb_varg_from_ull (long long ull) { return (CWEB_VArg) { CWEB_VA
CWEB_VArg cweb_varg_from_f (float f) { return (CWEB_VArg) { CWEB_VARG_TYPE_F, .f=f }; }
CWEB_VArg cweb_varg_from_d (double d) { return (CWEB_VArg) { CWEB_VARG_TYPE_D, .d=d }; }
CWEB_VArg cweb_varg_from_b (bool b) { return (CWEB_VArg) { CWEB_VARG_TYPE_B, .b=b }; }
CWEB_VArg cweb_varg_from_str (HTTP_String str) { return (CWEB_VArg) { CWEB_VARG_TYPE_STR, .str=str }; }
CWEB_VArg cweb_varg_from_str (CWEB_String str) { return (CWEB_VArg) { CWEB_VARG_TYPE_STR, .str=str }; }
CWEB_VArg cweb_varg_from_hash (CWEB_PasswordHash hash) { return (CWEB_VArg) { CWEB_VARG_TYPE_HASH, .hash=hash }; }
CWEB_VArg cweb_varg_from_pc (char *pc) { return (CWEB_VArg) { CWEB_VARG_TYPE_PC, .pc=pc }; }
CWEB_VArg cweb_varg_from_ps (short *ps) { return (CWEB_VArg) { CWEB_VARG_TYPE_PS, .ps=ps }; }
CWEB_VArg cweb_varg_from_pi (int *pi) { return (CWEB_VArg) { CWEB_VARG_TYPE_PI, .pi=pi }; }
@@ -130,8 +131,8 @@ CWEB_VArg cweb_varg_from_pull (long long *pull) { return (CWEB_VArg) { CWEB_VA
CWEB_VArg cweb_varg_from_pf (float *pf) { return (CWEB_VArg) { CWEB_VARG_TYPE_PF, .pf=pf }; }
CWEB_VArg cweb_varg_from_pd (double *pd) { return (CWEB_VArg) { CWEB_VARG_TYPE_PD, .pd=pd }; }
CWEB_VArg cweb_varg_from_pb (bool *pb) { return (CWEB_VArg) { CWEB_VARG_TYPE_PB, .pb=pb }; }
CWEB_VArg cweb_varg_from_pstr (HTTP_String *pstr) { return (CWEB_VArg) { CWEB_VARG_TYPE_PSTR, .pstr=pstr }; }
CWEB_VArg cweb_varg_from_pstr (CWEB_String *pstr) { return (CWEB_VArg) { CWEB_VARG_TYPE_PSTR, .pstr=pstr }; }
CWEB_VArg cweb_varg_from_phash(CWEB_PasswordHash *phash) { return (CWEB_VArg) { CWEB_VARG_TYPE_PHASH, .phash=phash }; }
/////////////////////////////////////////////////////////////////
// RANDOM
@@ -876,12 +877,155 @@ void cweb_respond(CWEB_Request *req, int status, CWEB_String content)
http_response_builder_done(req->builder);
}
void cweb_respond_redirect(CWEB_Request *req, CWEB_String target)
typedef struct {
char *dst;
int cap;
int len;
} StaticOutputBuffer;
static void append_to_output(StaticOutputBuffer *out, char *src, int len)
{
char location[128];
int ret = snprintf(location, sizeof(location), "Location: %.*s", target.len, target.ptr);
if (ret < 0 || ret >= SIZEOF(location)) {
// TODO
int unused = out->cap - out->len;
if (unused > 0)
memcpy(out->dst + out->len, src, MIN(len, unused));
out->len += len;
}
static void append_to_output_u64(StaticOutputBuffer *out, uint64_t n)
{
// TODO
}
static void append_to_output_s64(StaticOutputBuffer *out, int64_t n)
{
// TODO
}
static void append_to_output_ptr(StaticOutputBuffer *out, void *p)
{
// TODO
}
static void value_to_output(StaticOutputBuffer *out, CWEB_VArg arg)
{
switch (arg.type) {
case CWEB_VARG_TYPE_C : append_to_output(out, &arg.c, 1); break;
case CWEB_VARG_TYPE_S : append_to_output_s64(out, arg.s); break;
case CWEB_VARG_TYPE_I : append_to_output_s64(out, arg.i); break;
case CWEB_VARG_TYPE_L : append_to_output_s64(out, arg.l); break;
case CWEB_VARG_TYPE_LL : append_to_output_s64(out, arg.ll); break;
case CWEB_VARG_TYPE_SC : append_to_output_s64(out, arg.sc); break;
case CWEB_VARG_TYPE_SS : append_to_output_s64(out, arg.ss); break;
case CWEB_VARG_TYPE_SI : append_to_output_s64(out, arg.si); break;
case CWEB_VARG_TYPE_SL : append_to_output_s64(out, arg.sl); break;
case CWEB_VARG_TYPE_SLL : append_to_output_s64(out, arg.sll); break;
case CWEB_VARG_TYPE_UC : append_to_output_u64(out, arg.uc); break;
case CWEB_VARG_TYPE_US : append_to_output_u64(out, arg.us); break;
case CWEB_VARG_TYPE_UI : append_to_output_u64(out, arg.ui); break;
case CWEB_VARG_TYPE_UL : append_to_output_u64(out, arg.ul); break;
case CWEB_VARG_TYPE_ULL : append_to_output_u64(out, arg.ull); break;
case CWEB_VARG_TYPE_F : append_to_output_f64(out, arg.f); break;
case CWEB_VARG_TYPE_D : append_to_output_u64(out, arg.d); break;
case CWEB_VARG_TYPE_B : append_to_output(out, arg.b ? "true" : "false", arg.b ? 4: 5);break;
case CWEB_VARG_TYPE_STR : append_to_output(out, arg.str.ptr, arg.str.len); break;
case CWEB_VARG_TYPE_HASH : append_to_output(out, arg.hash.data, strlen(arg.hash.data)); break;
case CWEB_VARG_TYPE_PC : append_to_output_ptr(out, arg.pc); break;
case CWEB_VARG_TYPE_PS : append_to_output_ptr(out, arg.ps); break;
case CWEB_VARG_TYPE_PI : append_to_output_ptr(out, arg.pi); break;
case CWEB_VARG_TYPE_PL : append_to_output_ptr(out, arg.pl); break;
case CWEB_VARG_TYPE_PLL : append_to_output_ptr(out, arg.pll); break;
case CWEB_VARG_TYPE_PSC : append_to_output_ptr(out, arg.psc); break;
case CWEB_VARG_TYPE_PSS : append_to_output_ptr(out, arg.pss); break;
case CWEB_VARG_TYPE_PSI : append_to_output_ptr(out, arg.psi); break;
case CWEB_VARG_TYPE_PSL : append_to_output_ptr(out, arg.psl); break;
case CWEB_VARG_TYPE_PSLL : append_to_output_ptr(out, arg.psll); break;
case CWEB_VARG_TYPE_PUC : append_to_output_ptr(out, arg.puc); break;
case CWEB_VARG_TYPE_PUS : append_to_output_ptr(out, arg.pus); break;
case CWEB_VARG_TYPE_PUI : append_to_output_ptr(out, arg.pui); break;
case CWEB_VARG_TYPE_PUL : append_to_output_ptr(out, arg.pul); break;
case CWEB_VARG_TYPE_PULL : append_to_output_ptr(out, arg.pull); break;
case CWEB_VARG_TYPE_PF : append_to_output_ptr(out, arg.pf); break;
case CWEB_VARG_TYPE_PD : append_to_output_ptr(out, arg.pd); break;
case CWEB_VARG_TYPE_PB : append_to_output_ptr(out, arg.pb); break;
case CWEB_VARG_TYPE_PSTR : append_to_output_ptr(out, arg.pstr); break;
case CWEB_VARG_TYPE_PHASH: append_to_output_ptr(out, arg.phash); break;
}
}
static void evaluate_format(StaticOutputBuffer *out, CWEB_String format, CWEB_VArgs args)
{
char *src = format.ptr;
int len = format.len;
int cur = 0;
int arg_idx = 0;
for (;;) {
int off = cur;
while (cur < len && src[cur] != '{' && src[cur] != '\\')
cur++;
if (cur > off)
append_to_output(out, src + off, cur - off);
if (cur == len)
break;
cur++;
if (src[cur-1] == '{') {
while (cur < len && src[cur] != '}')
cur++;
if (cur < len) {
assert(src[cur] == '}');
cur++;
}
if (arg_idx < args.len) {
value_to_output(out, args.ptr[arg_idx]);
arg_idx++;
}
} else {
assert(src[cur-1] == '\\');
if (cur < len) {
append_to_output(out, &src[cur], 1);
cur++;
}
}
}
}
static CWEB_String evaluate_format_for_request_impl(CWEB_Request *req, CWEB_String format, CWEB_VArgs args)
{
StaticOutputBuffer out = {
.dst = req->arena.ptr + req->arena.cur,
.cap = req->arena.len - req->arena.cur,
.len = 0
};
evaluate_format(&out, format, args);
if (out.len > req->arena.len - req->arena.cur)
return (CWEB_String) { NULL, 0 };
req->arena.cur += out.len;
return (CWEB_String) { out.dst, out.len };
}
#define evaluate_format_for_request(req, format, ...) evaluate_format_for_request_impl((req), (format), CWEB_VARGS(__VA_ARGS__))
void cweb_respond_redirect_impl(CWEB_Request *req, CWEB_String target_format, CWEB_VArgs args)
{
CWEB_String target = evaluate_format_for_request_impl(req, target_format, args);
if (target.len == 0) {
http_response_builder_status(req->builder, 500);
http_response_builder_done(req->builder);
return;
}
CWEB_String location_header = evaluate_format_for_request(req, CWEB_STR("Location: {}"), target);
if (location_header.len == 0) {
http_response_builder_status(req->builder, 500);
http_response_builder_done(req->builder);
return;
}
http_response_builder_status(req->builder, 303);
@@ -892,7 +1036,7 @@ void cweb_respond_redirect(CWEB_Request *req, CWEB_String target)
http_response_builder_done(req->builder);
return;
}
http_response_builder_header(req->builder, (HTTP_String) { location, ret });
http_response_builder_header(req->builder, (HTTP_String) { location_header.ptr, location_header.len });
http_response_builder_done(req->builder);
}
src/main.h
+37 -18
View File
@@ -8,6 +8,10 @@ typedef struct {
int len;
} CWEB_String;
typedef struct {
char data[61];
} CWEB_PasswordHash;
CWEB_String cweb_trim(CWEB_String s);
bool cweb_streq(CWEB_String a, CWEB_String b);
@@ -31,6 +35,7 @@ typedef enum {
CWEB_VARG_TYPE_D,
CWEB_VARG_TYPE_B,
CWEB_VARG_TYPE_STR,
CWEB_VARG_TYPE_HASH,
CWEB_VARG_TYPE_PC,
CWEB_VARG_TYPE_PS,
CWEB_VARG_TYPE_PI,
@@ -50,6 +55,7 @@ typedef enum {
CWEB_VARG_TYPE_PD,
CWEB_VARG_TYPE_PB,
CWEB_VARG_TYPE_PSTR,
CWEB_VARG_TYPE_PHASH,
} CWEB_VArgType;
typedef struct {
@@ -74,6 +80,7 @@ typedef struct {
double d;
bool b;
CWEB_String str;
CWEB_PasswordHash hash;
char *pc;
short *ps;
int *pi;
@@ -93,9 +100,15 @@ typedef struct {
double *pd;
bool *pb;
CWEB_String *pstr;
CWEB_PasswordHash *phash;
};
} CWEB_VArg;
typedef struct {
int len;
CWEB_VArg *ptr;
} CWEB_VArgs;
CWEB_VArg cweb_varg_from_c (char c);
CWEB_VArg cweb_varg_from_s (short s);
CWEB_VArg cweb_varg_from_i (int i);
@@ -115,6 +128,7 @@ CWEB_VArg cweb_varg_from_f (float f);
CWEB_VArg cweb_varg_from_d (double d);
CWEB_VArg cweb_varg_from_b (bool b);
CWEB_VArg cweb_varg_from_str (CWEB_String str);
CWEB_VArg cweb_varg_from_hash (CWEB_PasswordHash hash);
CWEB_VArg cweb_varg_from_pc (char *pc);
CWEB_VArg cweb_varg_from_ps (short *ps);
CWEB_VArg cweb_varg_from_pi (int *pi);
@@ -134,8 +148,9 @@ CWEB_VArg cweb_varg_from_pf (float *pf);
CWEB_VArg cweb_varg_from_pd (double *pd);
CWEB_VArg cweb_varg_from_pb (bool *pb);
CWEB_VArg cweb_varg_from_pstr (CWEB_String *pstr);
CWEB_VArg cweb_varg_from_phash(CWEB_PasswordHash *phash);
#define CWEB_VARG(X) (_Generic((X), \
#define __CWEB_HELPER_ARG(X) (_Generic((X), \
char : cweb_varg_from_c, \
short : cweb_varg_from_s, \
int : cweb_varg_from_i, \
@@ -155,6 +170,7 @@ CWEB_VArg cweb_varg_from_pstr (CWEB_String *pstr);
double : cweb_varg_from_d, \
bool : cweb_varg_from_b, \
CWEB_String : cweb_varg_from_str, \
CWEB_PasswordHash : cweb_varg_from_hash, \
char* : cweb_varg_from_pc, \
short* : cweb_varg_from_ps, \
int* : cweb_varg_from_pi, \
@@ -173,21 +189,26 @@ CWEB_VArg cweb_varg_from_pstr (CWEB_String *pstr);
float* : cweb_varg_from_pf, \
double* : cweb_varg_from_pd, \
bool* : cweb_varg_from_pb, \
CWEB_String* : cweb_varg_from_pstr \
CWEB_String* : cweb_varg_from_pstr, \
CWEB_PasswordHash* : cweb_varg_from_phash \
))(X)
typedef struct {
int len;
CWEB_VArg *ptr;
} CWEB_VArgs;
// Helper macros
#define __CWEB_HELPER_DISPATCH_N(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, N, ...) N
#define __CWEB_HELPER_CONCAT_0(A, B) A ## B
#define __CWEB_HELPER_CONCAT_1(A, B) __CWEB_HELPER_CONCAT_0(A, B)
#define __CWEB_HELPER_ARGS_0() (CWEB_VArgs) { 0, (CWEB_VArg[]) {}}
#define __CWEB_HELPER_ARGS_1(a) (CWEB_VArgs) { 1, (CWEB_VArg[]) { __CWEB_HELPER_ARG(a) }}
#define __CWEB_HELPER_ARGS_2(a, b) (CWEB_VArgs) { 2, (CWEB_VArg[]) { __CWEB_HELPER_ARG(a), __CWEB_HELPER_ARG(b) }}
#define __CWEB_HELPER_ARGS_3(a, b, c) (CWEB_VArgs) { 3, (CWEB_VArg[]) { __CWEB_HELPER_ARG(a), __CWEB_HELPER_ARG(b), __CWEB_HELPER_ARG(c) }}
#define __CWEB_HELPER_ARGS_4(a, b, c, d) (CWEB_VArgs) { 4, (CWEB_VArg[]) { __CWEB_HELPER_ARG(a), __CWEB_HELPER_ARG(b), __CWEB_HELPER_ARG(c), __CWEB_HELPER_ARG(d) }}
#define __CWEB_HELPER_ARGS_5(a, b, c, d, e) (CWEB_VArgs) { 5, (CWEB_VArg[]) { __CWEB_HELPER_ARG(a), __CWEB_HELPER_ARG(b), __CWEB_HELPER_ARG(c), __CWEB_HELPER_ARG(d), __CWEB_HELPER_ARG(e) }}
#define __CWEB_HELPER_ARGS_6(a, b, c, d, e, f) (CWEB_VArgs) { 6, (CWEB_VArg[]) { __CWEB_HELPER_ARG(a), __CWEB_HELPER_ARG(b), __CWEB_HELPER_ARG(c), __CWEB_HELPER_ARG(d), __CWEB_HELPER_ARG(e), __CWEB_HELPER_ARG(f) }}
#define __CWEB_HELPER_ARGS_7(a, b, c, d, e, f, g) (CWEB_VArgs) { 7, (CWEB_VArg[]) { __CWEB_HELPER_ARG(a), __CWEB_HELPER_ARG(b), __CWEB_HELPER_ARG(c), __CWEB_HELPER_ARG(d), __CWEB_HELPER_ARG(e), __CWEB_HELPER_ARG(f), __CWEB_HELPER_ARG(g) }}
#define __CWEB_HELPER_ARGS_8(a, b, c, d, e, f, g, h) (CWEB_VArgs) { 8, (CWEB_VArg[]) { __CWEB_HELPER_ARG(a), __CWEB_HELPER_ARG(b), __CWEB_HELPER_ARG(c), __CWEB_HELPER_ARG(d), __CWEB_HELPER_ARG(e), __CWEB_HELPER_ARG(f), __CWEB_HELPER_ARG(g), __CWEB_HELPER_ARG(h) }}
#define __CWEB_COUNT_ARGS(...) __CWEB_HELPER_DISPATCH_N(DUMMY, ##__VA_ARGS__, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
#define CWEB_VARGS_1(a) (CWEB_VArgs) {1, (CWEB_VArg[]) { CWEB_VARG(a) } }
#define CWEB_VARGS_2(a, b) (CWEB_VArgs) {2, (CWEB_VArg[]) { CWEB_VARG(a), CWEB_VARG(b) } }
#define CWEB_VARGS_3(a, b, c) (CWEB_VArgs) {3, (CWEB_VArg[]) { CWEB_VARG(a), CWEB_VARG(b), CWEB_VARG(c) } }
#define CWEB_VARGS_4(a, b, c, d) (CWEB_VArgs) {4, (CWEB_VArg[]) { CWEB_VARG(a), CWEB_VARG(b), CWEB_VARG(c), CWEB_VARG(d) } }
#define CWEB_VARGS_5(a, b, c, d, e) (CWEB_VArgs) {5, (CWEB_VArg[]) { CWEB_VARG(a), CWEB_VARG(b), CWEB_VARG(c), CWEB_VARG(d), CWEB_VARG(e) } }
#define CWEB_DISPATCH__(_1, _2, _3, _4, _5, NAME, ...) NAME
#define CWEB_VARGS(...) CWEB_DISPATCH__(__VA_ARGS__, CWEB_VARGS_5, CWEB_VARGS_4, CWEB_VARGS_3, CWEB_VARGS_2, CWEB_VARGS_1)(__VA_ARGS__)
#define CWEB_VARGS(...) __CWEB_HELPER_CONCAT_1(__CWEB_HELPER_ARGS_, __CWEB_COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__)
typedef struct CWEB CWEB;
typedef struct CWEB_Request CWEB_Request;
@@ -220,9 +241,11 @@ int cweb_get_param_i(CWEB_Request *req, CWEB_String name);
// Response
void cweb_respond_basic(CWEB_Request *req, int status, CWEB_String content);
void cweb_respond_redirect(CWEB_Request *req, CWEB_String target);
void cweb_respond_redirect_impl(CWEB_Request *req, CWEB_String target_format, CWEB_VArgs args);
void cweb_respond_template(CWEB_Request *req, int status, CWEB_String template_file, int resource_id);
#define cweb_respond_redirect(req, format, ...) cweb_respond_redirect_impl((req), (format), CWEB_VARGS(__VA_ARGS__))
//////////////////////////////////////
// Database
@@ -242,9 +265,5 @@ void cweb_free_query_result(CWEB_QueryResult *res);
//////////////////////////////////////
// Password
typedef struct {
char data[61];
} CWEB_PasswordHash;
int cweb_hash_password(char *pass, int passlen, int cost, CWEB_PasswordHash *hash);
int cweb_check_password(char *pass, int passlen, CWEB_PasswordHash hash);