/*
 * Derived from the Linux kernel
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
 *
 * This file may be dual licensed with the new BSD license.
 */

#ifndef STRING_H
#define STRING_H

#include <stddef.h>
#include <stdlib.h>

extern void *memcpy(void *dest, const void *src, size_t n);
extern void *memmove(void *dest, const void *src, size_t n);
extern void *memset(void *s, int c, size_t n);
extern int memcmp(const void *s1, const void *s2, size_t n);

extern int sprintf(char *buf, const char *fmt, ...);

// yes, linux has fancy ones. We don't care. This stuff gets used 
// hardly at all. And the pain of including those files is just too high.

//extern inline void strcpy(char *dst, char *src) {while (*src) *dst++ = *src++;}

//extern inline int strlen(char *src) { int i = 0; while (*src++) i++; return i;}

static inline size_t strnlen(const char *src, size_t max)
{
	size_t i = 0;
	while ((*src++) && (i < max)) {
		i++;
	}
	return i;
}

static inline size_t strlen(const char *src)
{
	size_t i = 0;
	while (*src++) {
		i++;
	}
	return i;
}

static inline char *strchr(const char *s, int c)
{
	for (; *s; s++) {
		if (*s == c)
			return (char *)s;
	}
	return 0;
}

static inline char *strdup(const char *s)
{
	size_t sz = strlen(s) + 1;
	char *d = malloc(sz);
	memcpy(d, s, sz);
	return d;
}

static inline char *strncpy(char *to, const char *from, int count)
{
	register char *ret = to;

	while (count > 0) {
		count--;
		if ((*to++ = *from++) == '\0')
			break;
	}

	while (count > 0) {
		count--;
		*to++ = '\0';
	}
	return ret;
}

static inline int strcmp(const char *s1, const char *s2)
{
	int r;

	while ((r = (*s1 - *s2)) == 0 && *s1) {
		s1++;
		s2++;
	}
	return r;
}

static inline int isspace(int c)
{
	switch (c) {
	case ' ':
	case '\f':
	case '\n':
	case '\r':
	case '\t':
	case '\v':
		return 1;
	default:
		return 0;
	}
}

static inline int isdigit(int c)
{
	return (c >= '0' && c <= '9');
}

static inline int isxdigit(int c)
{
	return ((c >= '0' && c <= '9') ||
		(c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'));
}

static inline int isupper(int c)
{
	return (c >= 'A' && c <= 'Z');
}

static inline int islower(int c)
{
	return (c >= 'a' && c <= 'z');
}

static inline int toupper(int c)
{
	if (islower(c))
		c -= 'a' - 'A';
	return c;
}

static inline int tolower(int c)
{
	if (isupper(c))
		c -= 'A' - 'a';
	return c;
}
#endif				/* STRING_H */