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/* libanode: the Anode C reference implementation
* Copyright (C) 2009-2010 Adam Ierymenko <adam.ierymenko@gmail.com>
*
* 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>. */
/* This contains miscellaneous functions, including some re-implementations
* of some functions from string.h. This is to help us port to some platforms
* (cough Windows Mobile cough) that lack a lot of the basic C library. */
#ifndef _ANODE_MISC_H
#define _ANODE_MISC_H
#include <time.h>
#include <sys/time.h>
#include "types.h"
#ifndef ANODE_NO_STRING_H
#include <string.h>
#include <stdlib.h>
#endif
/* Table mapping ASCII characters to themselves or their lower case */
extern const unsigned char Anode_ascii_tolower_table[256];
/* Get the lower case version of an ASCII char */
#define Anode_tolower(c) ((char)Anode_ascii_tolower_table[((unsigned long)((unsigned char)(c)))])
/* Test strings for equality, return nonzero if equal */
static inline unsigned int Anode_streq(const char *restrict a,const char *restrict b)
{
if ((!a)||(!b))
return 0;
while (*a == *(b++)) {
if (!*(a++))
return 1;
}
return 0;
}
/* Equality test ignoring (ASCII) case */
static inline unsigned int Anode_strcaseeq(const char *restrict a,const char *restrict b)
{
if ((!a)||(!b))
return 0;
while (Anode_tolower(*a) == Anode_tolower(*(b++))) {
if (!*(a++))
return 1;
}
return 0;
}
/* Safe c-string copy, ensuring that dest[] always ends with zero */
static inline void Anode_str_copy(char *restrict dest,const char *restrict src,unsigned int dest_size)
{
char *restrict dest_end = dest + (dest_size - 1);
while ((*src)&&(dest != dest_end))
*(dest++) = *(src++);
*dest = (char)0;
}
/* Simple memcpy() */
#ifdef ANODE_NO_STRING_H
static inline void Anode_memcpy(void *restrict dest,const void *restrict src,unsigned int len)
{
unsigned int i;
for(i=0;i<len;++i)
((unsigned char *restrict)dest)[i] = ((const unsigned char *restrict)src)[i];
}
#else
#define Anode_memcpy(d,s,l) memcpy((d),(s),(l))
#endif
/* Memory test for equality */
#ifdef ANODE_NO_STRING_H
static inline unsigned int Anode_mem_eq(const void *restrict a,const void *restrict b,unsigned int len)
{
unsigned int i;
for(i=0;i<len;++i) {
if (((const unsigned char *restrict)a)[i] != ((const unsigned char *restrict)b)[i])
return 0;
}
return 1;
}
#else
#define Anode_mem_eq(a,b,l) (!memcmp((a),(b),(l)))
#endif
/* Zero memory */
#ifdef ANODE_NO_STRING_H
static inline void Anode_zero(void *restrict ptr,unsigned int len)
{
unsigned int i;
for(i=0;i<len;++i)
((unsigned char *restrict)ptr)[i] = (unsigned char)0;
}
#else
#define Anode_zero(p,l) memset((p),0,(l))
#endif
/* Get a pointer to the first occurrance of a character in a string */
#ifdef ANODE_NO_STRING_H
static inline const char *Anode_strchr(const char *s,char c)
{
while (*s) {
if (*s == c)
return s;
++s;
}
return (char *)0;
}
#else
#define Anode_strchr(s,c) strchr((s),(c))
#endif
static inline unsigned int Anode_count_char(const char *s,char c)
{
unsigned int cnt = 0;
while (s) {
if (*s == c)
++cnt;
++s;
}
return cnt;
}
/* Strip all of a given set of characters from a string */
static inline void Anode_strip_all(char *s,const char *restrict schars)
{
char *d = s;
while (*s) {
if (!Anode_strchr(schars,*s))
*(d++) = *s;
++s;
}
*d = (char)0;
}
/* Trim whitespace from beginning and end of string */
void Anode_trim(char *s);
/* Get the length of a string */
#ifdef ANODE_NO_STRING_H
static inline unsigned int Anode_strlen(const char *s)
{
const char *ptr = s;
while (*ptr) ++ptr;
return (unsigned int)(ptr - s);
}
#else
#define Anode_strlen(s) strlen((s))
#endif
/* Returns number of milliseconds since the epoch (Java-style) */
static inline uint64_t Anode_time64()
{
struct timeval tv;
gettimeofday(&tv,(void *)0);
return ( (((uint64_t)tv.tv_sec) / 1000ULL) + ((uint64_t)(tv.tv_usec / 1000ULL)) );
}
/* Returns number of seconds since the epoch (*nix style) */
static inline unsigned long Anode_time()
{
struct timeval tv;
gettimeofday(&tv,(void *)0);
return (unsigned long)tv.tv_sec;
}
/* Simple random function, not cryptographically safe */
unsigned int Anode_rand();
/* Fast hex/ascii conversion */
void Anode_to_hex(const unsigned char *b,unsigned int len,char *h,unsigned int hlen);
void Anode_from_hex(const char *h,unsigned char *b,unsigned int blen);
/* Convert back and forth from base32 encoding */
/* 5 bytes -> 8 base32 characters and vice versa */
void Anode_base32_5_to_8(const unsigned char *in,char *out);
void Anode_base32_8_to_5(const char *in,unsigned char *out);
#endif
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