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#include <stddef.h>
#include <stdbool.h>
bool isdigit(char c)
{
return c >= 48 && c <= 57;
}
size_t strlen(const char *s)
{
size_t c = 0;
while (s[c])
c++;
return c;
}
size_t strnlen(const char *s, size_t maxlen)
{
size_t c = 0;
while (c <= maxlen && s[c])
c++;
return c;
}
char *strcpy(char *restrict dst, const char *restrict src)
{
size_t pos = 0;
size_t len = strlen(src) + 1;
for(pos = 0; pos <= len; pos++)
dst[pos] = src[pos];
return dst;
}
int strncmp(const char *s1, const char *s2, size_t n)
{
int i = 0;
for (i = 0; i < n; i++) {
if (s1[i] != s2[i])
return s1[i] - s2[i];
}
return 0;
}
void *memset(void *s, int c, size_t n) {
char *cur = (char*) s;
int i;
for (i = 0; i < n; i++)
cur[i] = (unsigned char)c;
return s;
}
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