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#include <stddef.h>
#include <stdint.h>
#include "string.h"
int memcmp(const void *s1, const void *s2, size_t n)
{
unsigned char *a = (unsigned char *) s1;
unsigned char *b = (unsigned char *) s2;
for (size_t i=0;i<n;i++)
if (a[i] != b[i]) return a[i] - b[i];
return 0;
}
void *memcpy(void *dest, const void *src, size_t n)
{
unsigned char *d = (unsigned char *) dest;
unsigned char *s = (unsigned char *) src;
for (size_t i=0;i<n;i++) d[i] = s[i];
return dest;
}
void *memmove(void *dest, const void *src, size_t n)
{
unsigned char *d = (unsigned char *) dest;
unsigned char *s = (unsigned char *) src;
if (d < s)
for (size_t i=0;i<n;i++)
d[i] = s[i];
else
for (size_t i=n;i!=0;i--)
d[i-1] = s[i-1];
return dest;
}
void *memset(void *s, int c, size_t n)
{
unsigned char *str = (unsigned char *) s;
for (size_t i=0;i<n;i++) str[i] = c;
return s;
}
size_t strlen(const char *s)
{
size_t len = 0;
while (s[++len]);
return len;
}
// BELOW: YET UNTESTED
char *strcpy(char *dest, const char *src) {
for (size_t i=0;src[i]!='\0';i++) dest[i] = src[i];
return dest;
}
char *strncpy(char *dest, const char *src, size_t n) {
for (size_t i=0;src[i]!='\0'&&i<n;i++) dest[i] = src[i];
return dest;
}
int strcmp(const char *s1, const char *s2) {
size_t i;
for (i = 0;s1[i]!='\0'&&s2[i]!='\0';i++)
if (s1[i] != s2[i]) break;
return s1[i] - s2[i];
}
int strncmp(const char *s1, const char *s2, size_t n) {
size_t i;
for (i = 0;s1[i]!='\0'&&s2[i]!='\0'&&i<n;i++)
if (s1[i] != s2[i]) break;
return s1[i] - s2[i];
}
char *strstr(const char *haystack, const char *needle) {
int l = strlen(needle);
for (const char *r=haystack;*r!='\0';r++)
if (strncmp(r, needle, l) == 0) return (char *) r;
return NULL;
}
char *strchr(const char *s, int c) {
const char *r = s;
for (;*r!='\0';r++)
if (*r == c) return (char *) r;
if (c == 0) return (char *) r;
return NULL;
}
size_t strspn(const char *s, const char *accept) {
size_t i;
for (i=0;accept[i]!='\0'&&accept[i]==s[i];i++);
return i;
}
char *hex(uint32_t n, char *buf)
{
buf[0] = '0'; buf[1] = 'x';
for (int i=0;i<8;i++)
{
int digit = (n >> (i * 4)) & 0xF;
if (digit < 10)
buf[9 - i] = '0' + digit;
else
buf[9 - i] = 'A' + (digit - 10);
}
return buf;
}
#define R(a, b) (c >= a && c <= b)
bool isupper(char c) {return R('A', 'Z');}
bool islower(char c) {return R('a', 'z');}
bool isalpha(char c) {return isupper(c) || islower(c);}
bool isdigit(char c) {return R('0', '9');}
bool isxdigit(char c) {return isdigit(c) || R('A', 'F') || R('a', 'f');}
bool isalnum(char c) {return isdigit(c) || isalpha(c);}
bool isspace(char c) {return c == ' ' || (unsigned)c-'\t' < 5;}
char toupper(char c) {if (islower(c)) return (c + ('A' - 'a')); else return c;}
char tolower(char c) {if (isupper(c)) return (c - ('A' - 'a')); else return c;}
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