Error C (from H file to V : warning: implicit declaration of function 'sha3_finalize' /tmp/v_1000/SHA3.01HYG2REZ8HW9F433E3J5B37XR.tmp.c:13117: error: '{' expected (got ";")

[b-bruno]

V doctor:

**Prequiste SHA3 C Lib** : https://github.com/brainhub/SHA3IUF/blob/master/sha3.h

V full version: V 0.4.6 0be5377.7a36b44
OS: linux, "Arch Linux"
Processor: 8 cpus, 64bit, little endian, 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz

getwd: /home/bruno/Documents/Dev/SHA3
vexe: /home/bruno/Téléchargements/v/v
vexe mtime: 2024-05-22 05:59:15

vroot: OK, value: /home/bruno/Téléchargements/v
VMODULES: OK, value: /home/bruno/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.45.1
Git vroot status: 0.4.6-13-g7a36b44c
.git/config present: true

CC version: cc (GCC) 14.1.1 20240507
thirdparty/tcc status: thirdparty-linux-amd64 40e5cbb5

What did you do?
v -g -o vdbg cmd/v && vdbg sha3.v

module main

#flag -I/home/bruno/Documents/Dev/SHA3/include/
#flag -L/home/bruno/Documents/Dev/SHA3/lib/
#flag -lsha3
//#flag -llibsha3
#include "sha3.h"

const (
    //sha3_keccak_sponge_words = (1600 / 8) / int(sizeof(u64))
    sha3_keccak_sponge_words = 25 // = (1600 / 8) / int(sizeof(u64))
)

enum Sha3Flags as u8 {
	sha3_flags_none = 0
	sha3_flags_keccak = 1
}

enum Sha3Return {   
	sha3_return_ok = 0    
	sha3_return_bad_params = 1
}

struct Sha3Context {
    saved         u64                  // the portion of the input message that we didn't consume yet
    s             [sha3_keccak_sponge_words]u64  // Keccak's state
    sb            [sha3_keccak_sponge_words * 8]u8  // Keccak's state
    byte_index    u32                  // 0..7--the next byte after the set one (starts from 0; 0--none are buffered)
    word_index    u32                  // 0..24--the next word to integrate input (starts from 0)
    capacity_words u32                 // the double size of the hash output in words (e.g. 16 for Keccak 512)
}

fn C.sha3_init256(context &Sha3Context)
fn C.sha3_init384(context &Sha3Context)
fn C.sha3_init512(context &Sha3Context)

fn C.sha3_set_flags(context &Sha3Context, flag Sha3Flags) Sha3Flags

fn C.sha3_update(context &Sha3Context, buf_in []u8, len u64)
fn C.sha3_finalize(context &Sha3Context) []u8

fn main() {
	mut c := Sha3Context{}
	sha3_flags_keccak := Sha3Flags.sha3_flags_keccak
	println('SHA3 test C implementation')
	mut i := 16777216
  C.sha3_init256(&c)
  C.sha3_set_flags(&c, sha3_flags_keccak)
  for i > 0 {
    C.sha3_update(&c, "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmno".bytes(), 64)
    i--
  }
  hash := C.sha3_finalize(&c)
	println('hash SHA256 $hash.str()')

}
[sha3.zip](https://github.com/vlang/v/files/15402848/sha3.zip)

What did you expect to see?

hash SHA3_256 result

What did you see instead?

Compilation with unknown C compiler
==================
/tmp/v_1000/sha3.01HYG2RMT1WP8CX020BV13RC6N.tmp.c:13117: warning: implicit declaration of function 'sha3_finalize'
/tmp/v_1000/sha3.01HYG2RMT1WP8CX020BV13RC6N.tmp.c:13117: error: '{' expected (got ";")
...
==================
(Use `v -cg` to print the entire error message)

builder error: 
==================
C error found. It should never happen, when compiling pure V code.
This is a V compiler bug, please report it using `v bug file.v`,
or goto https://github.com/vlang/v/issues/new/choose .
You can also use #help on Discord: https://discord.gg/vlang .

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[felipensp]

Take a look at the function names on .h file, they are not lowercased.

E.g.

void sha3_Update(void *priv, void const *bufIn, size_t len);
void const *sha3_Finalize(void *priv);

Not a bug here.