micro-utils/libmu/make_path.c

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

char *mu_make_path(const char *prog_name, const char *src, const char *dst) {
	int flag = 0;

	if (src == NULL) {
		flag = 1;
		src = "";
	}

	if (dst == NULL) {
		flag = 1;
		dst = "";
	}

	size_t len = strlen(src) + strlen(dst) + 2;
	char *full_path = malloc(len + 1);
	if (full_path == NULL) {
		if (prog_name != NULL)
			fprintf(stderr, "%s: malloc() failed\n", prog_name);

		return NULL;
	}

	if (flag || src[strlen(src) - 1] == '/')
		snprintf(full_path, len, "%s%s", src, dst);

	else
		snprintf(full_path, len, "%s/%s", src, dst);

	return full_path;
}