#include "link.h"
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char* link_strdup(const char* str)
{
    size_t len = strlen(str);
    char* val = calloc(len + 1, sizeof(char));
    strncpy(val, str, len);
    return val;
}

FILE* open_output_file(const char* filename)
{
    FILE* fp = fopen(filename, "wb");
    if (!fp) {
        fprintf(stderr,
            "error: could not open output file '%s' for writing: %s\n",
            filename,
            strerror(errno));
        return NULL;
    }
    return fp;
}

FILE* open_input_file(const char* filename)
{
    FILE* fp = fopen(filename, "rb");
    if (!fp) {
        fprintf(stderr,
            "error: could not open input file '%s' for reading: %s\n",
            filename,
            strerror(errno));
        return NULL;
    }
    return fp;
}

const char* file_iter_next(FileIter* iter)
{
    while (iter->files) {
        const char* arg = iter->argv[iter->argc];
        iter->argc += 1;
        if (strcmp(arg, "-o") == 0) {
            iter->argc += 1;
            continue;
        } else if (strcmp(arg, "-p") == 0) {
            iter->argc += 1;
            continue;
        }
        iter->files -= 1;
        return arg;
    }
    return NULL;
}