#include "util.h"

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

/*
Copyright (c) 2013-2021 Devine Lu Linvega
2018 web port by rezmason
2021 C89 port by rezmason

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE.
*/

FuncWrapper *
wrapFunction(void (*f)(void))
{
	FuncWrapper *func = malloc(sizeof(FuncWrapper));
	func->f = f;
	return func;
}

char *
concat(const char *s1, const char *s2)
{
	char *result = malloc(strlen(s1) + strlen(s2) + 1);
	strcpy(result, s1);
	strcat(result, s2);
	return result;
}

char *
duplicate(const char *s)
{
	char *result = malloc(strlen(s) + 1);
	strcpy(result, s);
	return result;
}

int
isMatch(char *c, const char *candidates)
{
	int i;
	for(i = 0; candidates[i] != 0; i++)
		if(*c == candidates[i])
			return 1;
	return 0;
}

/* a homemade strtok_r, just like mom used to make */
char *
getNextToken(char *s, const char *delim, char **save)
{
	char *start, *end;
	if(s == NULL) {
		s = *save;
	}
	if(s == NULL) {
		return NULL;
	}

	start = s;
	while(*start != 0 && isMatch(start, delim)) {
		start++; /* skip past the first delimiters */
	}
	if(*start == 0) {
		/* there is no token in the buffer */
		*save = NULL;
		return NULL;
	}

	end = start;
	while(*end != 0 && !isMatch(end, delim)) {
		end++; /* skip past the non-delimiters */
	}
	s = (*end != 0) ? end + 1 : NULL; /* save what comes after the end */
	*end = 0;
	*save = s;

	return start;
}