io.c

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// Copyright (C) 2023 Ethan Uppal. All rights reserved.
 
#include <stdlib.h>  // exit, malloc
#include <stdio.h>   // FILE et al.
#include "io.h"
 
void ps_file_ctx_init(struct ps_file_ctx* file_ctx, STR filename, char* buffer,
    usize length) {
    file_ctx->filename = filename;
    file_ctx->buffer = buffer;
    file_ctx->length = length;
}
 
char* ps_read_file_safe(const char* filename, isize* length_ext) {
    FILE* file = fopen(filename, "r");
    if (!file) {
        perror("fopen");
        exit(1);
    }
 
    if (fseek(file, 0, SEEK_END) == -1) {
        perror("fseek");
        exit(1);
    }
    long length = ftell(file);
    *length_ext = length;
    if (length == -1) {
        perror("ftell");
        exit(1);
    }
    rewind(file);
 
    char* buffer = malloc(length + 1);
    if (!buffer) {
        perror("malloc");
        exit(1);
    }
 
    if (fread(buffer, sizeof(char), length, file) != (unsigned long)length) {
        perror("fread");
        exit(1);
    }
    buffer[length] = 0;
 
    if (fclose(file) == EOF) {
        perror("fclose");
        exit(1);
    }
 
    return buffer;
}