Random C string utils

utils.c

// NOTE: _GNU_SOURCE is required for this to work because of asprintf

#define _GNU_SOURCE

#include <stdarg.h>
#include <stdio.h>

// This function allocates a string, prints the formatted version to it and uses write to print it to stdout.
void waprintf(const char *fmt, ...) {
	va_list args;
	char *str = NULL;
	va_start(args, fmt);
	vasprintf(&str, fmt, args);
	va_end(args);
	write(1, str, strlen(str) * sizeof(char));
	free(str);
}

#define _GNU_SOURCE

#include <string.h>
#include <stdlib.h>
#include <stdio.h>

// This is like atoi but the other direction
// NOTE: the string will be invalid on the next call to itoa
char ibuf[32];
char *itoa(int x) {
	return snprintf(&ibuf, 31, "%d", x);
}

// This function converts an array of ints into a string.
char *array_to_string(int *arr, int count) {
	int i;
	int size = 1;
	char *data = malloc(sizeof(char) * size);
	data[0] = '\0';
	for (i = 0; i < count; i++) {
		char *temp = itoa(arr[i]);
		size += strlen(temp) + 2;
		data = realloc(data, sizeof(char) * size);
		strcat(data, "  ");
		strcat(data, temp);
	}

	return data;
}