config.c


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#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"

char *read_file(const char *filename, long *size) {
	/* Open the file. */
	FILE *fp = fopen(filename, "r");
	/* Size of the file, in bytes. */
	long filesize = 0;
	/* Buffer of the file contents. */
	char *buf;

	/* Return NULL, if we couldn't open the file. */
	if (fp == NULL) {
		fclose(fp);
		return NULL;
	}

	/* Return NULL, if we couldn't seek to the end of the file. */
	if (fseek(fp, 0L, SEEK_END)) {
		fclose(fp);
		return NULL;
	}

	/* Get the size of the file, in bytes. */
	filesize = ftell(fp);

	/* Return NULL, if the returned size is negative. */
	if (filesize < 0) {
		fclose(fp);
		return NULL;
	}

	/* Allocate enough space for the entire file, plus one. */
	buf = malloc(filesize+1);

	/* Return NULL, if the buffer wasn't allocated. */
	if (buf == NULL) {
		fclose(fp);
		free(cfg);
		return NULL;
	}

	/* Zero out the buffer. */
	memset(buf, 0, filesize+1);

	/* Seek back to the start of the file. */
	rewind(fp);
	/* Read the entire file contents into the buffer. */
	fread(buf, sizeof(char), filesize, fp);
	/* Close the file. */
	fclose(fp);

	/* Return the filesize, in bytes. */
	*size = filesize;
	/* Return the buffer. */
	return buf;
}

char *get_line(char **str) {
	char *s;
	size_t i;

	for (i = 0; *str[i] != '\n' && *str[i] != '\0'; i++);

	s = malloc(i+1);
	memset(s, 0, i+1);
	memcpy(s, *str, i);

	str += i;
	return s;
}

config *parse_config(const char *filename) {
	/* Size of the file, in bytes. */
	long filesize = 0;
	/* Config settings. */
	config *cfg;
	/* Buffer of the file contents. */
	char *buf = read_file(filename, &filesize);

	/* Return NULL, if the buffer wasn't allocated */
	if (buf == NULL) {
		return NULL;
	}

	cfg = malloc(sizeof(config));

	/* Return NULL, if cfg wasn't allocated. */
	if (cfg == NULL) {
		free(buf);
		return NULL;
	}

	while (*buf != '\0') {
		char *line = get_line(&buf);
		char *value;
		char *name = strtok_r(line, "=", &value);
	}
}