error translating from pure v to c

[venomega]

V version: V 0.4.9 2aa5651, press to see full `v doctor` output

V full version	V 0.4.9 d313355.2aa5651
OS	linux, "Arch Linux"
Processor	4 cpus, 64bit, little endian, Intel(R) Core(TM) 7 150U
Memory	7.66GB/15.31GB
V executable	/opt/v/v
V last modified time	2025-01-06 10:27:48
V home dir	OK, value: /opt/v
VMODULES	OK, value: /home/venomega/.vmodules
VTMP	OK, value: /tmp/v_1000
Current working dir	OK, value: /home/venomega/vsync/src
Git version	git version 2.47.1
V git status	Error: fatal: bad revision 'HEAD'
.git/config present	true
cc version	cc (GCC) 14.2.1 20240910
gcc version	gcc (GCC) 14.2.1 20240910
clang version	clang version 18.1.8
tcc version	tcc version 0.9.28rc 2024-07-31 HEAD@1cee0908 (x86_64 Linux)
tcc git status	N/A
emcc version	N/A
glibc version	ldd (GNU libc) 2.40

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

module main

import os
import math
import prantlf.cargs { parse, Input }

// Declare a structure with all command-line options.
struct Opts {
  output string
  indent int
  pretty bool
}

// Describe usage of the command-line tool.
fn parsero() ! (&Opts, []string) {

usage := 'Converts YAML input to JSON output.

Usage: yaml2json [options] [<yaml-file>]

  <yaml-file>         read the YAML input from a file

Options:
  -o|--output <file>   write the JSON output to a file
  -i|--indent <count>  write the JSON output to a file
  -p|--pretty          print the JSON output with line breaks and indented
  -V|--version         print the version of the executable and exit
  -h|--help            print the usage information and exit

If no input file is specified, it will be read from standard input.

Examples:
  $ yaml2json config.yaml -o config.json -p
  $ cat config.yaml | yaml2json > config.json'


// Parse command-line options and arguments.
opts, args := parse[Opts](usage, Input{ version: '0.0.1' })!
//return opts, args
return opts, args
}

fn main(){
	_, args := parsero()!
	if args.len != 2 {
		logerr("you need to specify source and destination args")
	}
	source := args[0]
	mut destination := args[1]
	// logica del destino
	if os.is_dir(destination){
		destination = destination + "/" + os.base(source)
	}
	mut source_fd := os.open(source) or {
		panic("Error opening ${source}")
	}
	println("Source: " + source + "\nDestination: " + destination)
	mut destination_fd := os.open_append(destination) or {
		panic("Can't open file ${destination} for writing")
	}
	//seeking
	aaa := destination_fd.tell() !
	if aaa > 0{
		source_fd.seek(aaa, os.SeekMode.start ) or {
			panic("Can't seek ${source}")
		}
	}
	source_stats := os.stat(source) !

	if source_stats.size < aaa{
		panic("Seems like you are trying to mirror not same source & destination file, if you are sure remove destination first.")
	}

	//writing
	mut total_length := aaa
	mut last := 0
	for {
		lop := source_fd.tell() !
		if last <= lop {
			last = int(lop)
		}else{
			break
		}
		nn := source_stats.size - source_fd.tell() !
		min, _ := math.minmax(nn, 3333)

		buff := source_fd.read_bytes_at(int(min), u64(total_length))
		n := buff.len
		if n > 0{
			destination_fd.write(buff) or {
				panic("Can't write to ${destination}")
			}
			total_length += n
			//source_fd.seek(total_length, os.SeekMode.start) or {
			//	panic("Can't seek source ${source}")
			//}
		}else{
			break
		}
		print("\b\b\b${total_length * 100 / source_stats.size}%")
	}
	println("Exited")
}

fn logerr(s string) {
	println(s)
	exit (1)
}

fn main2() {
}

What did you see?

you need to specify source and destination args

What did you expect to see?

this code should translate to C, it says error when used with 'v main.v -o main.o'

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[huly-for-github]

Connected to Huly®: V_0.6-21953

[venomega]

forget it, prantlf is not written purely in v