# io.c
Input/output functions for c-md mapping files.

---

## Includes
```c
#include <stdio.h>

#include "map.h"
#include "internal/map_internal.h"
```

---

## Forward Declarations
```c
static int8_t	write_header(FILE *f, const char *source, const char *target);
static int8_t	write_ranges(FILE *f, t_map *map);
```

---

## Function Descriptions

### `map_write`
Writes a c-md mapping file to the specified path.

#### Parameters
- `map`: Pointer to the mapping structure.
- `path`: Pointer to the output file path string.
- `source`: Pointer to the source file name string.
- `target`: Pointer to the target file name string.

#### Return Value
Return 0 on success, or 1 on failure.

##### Implementation
```c
int8_t
map_write(t_map *map, const char *path, const char *source, const char *target)
{
	FILE	*f;
	int8_t	ret;

	f = fopen(path, "w");
	if (NULL == f)
	{
		perror(path);
		return (1);
	}
	ret = write_header(f, source, target);
	if (0 == ret)
		ret = write_ranges(f, map);
	fclose(f);
	return (ret);
}
```

### `write_header`
Writes the header of a c-md mapping file. (v1 format)

#### Parameters
- `f`: Pointer to the output file.
- `source`: Pointer to the source file name string.
- `target`: Pointer to the target file name string.

#### Return Value
Return 0 on success, or 1 on failure.

#### Implementation
```c
int8_t
write_header(FILE *f, const char *source, const char *target)
{
	if (0 > fprintf(f, "C-MD MAP v1\n"))
		return (1);
	if (0 > fprintf(f, "source: %s\n", source))
		return (1);
	if (0 > fprintf(f, "target: %s\n", target))
		return (1);
	if (0 > fprintf(f, "---\n"))
		return (1);
	return (0);
}
```

### `write_ranges`
Writes the ranges of a c-md mapping file.

#### Parameters
- `f`: Pointer to the output file.
- `map`: Pointer to the mapping structure.

#### Return Value
Return 0 on success, or 1 on failure.

#### Implementation
```c
int8_t
write_ranges(FILE *f, t_map *map)
{
	size_t		i;
	t_range		*r;

	i = 0;
	while (i < map->count)
	{
		r = &map->ranges[i];
		if (0 > fprintf(f, "%u-%u:%u-%u\n",
			r->src_start, r->src_end, r->dst_start, r->dst_end))
			return (1);
		i++;
	}
	return (0);
}
```