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// MIT License, Copyright (c) 2020 Marvin Borner
#include <def.h>
#include <mem.h>
#include <str.h>
u32 strlen(const char *s)
{
const char *ss = s;
while (*ss)
ss++;
return ss - s;
}
char *strcpy(char *dst, const char *src)
{
char *q = dst;
const char *p = src;
char ch;
do {
*q++ = ch = *p++;
} while (ch);
return dst;
}
char *strncpy(char *dst, const char *src, u32 n)
{
char *q = dst;
while (n-- && (*dst++ = *src++))
;
return q;
}
int strcmp(const char *s1, const char *s2)
{
const u8 *c1 = (const u8 *)s1;
const u8 *c2 = (const u8 *)s2;
u8 ch;
int d = 0;
while (1) {
d = (int)(ch = *c1++) - (int)*c2++;
if (d || !ch)
break;
}
return d;
}
int strncmp(const char *s1, const char *s2, u32 n)
{
const u8 *c1 = (const u8 *)s1;
const u8 *c2 = (const u8 *)s2;
u8 ch;
int d = 0;
while (n--) {
d = (int)(ch = *c1++) - (int)*c2++;
if (d || !ch)
break;
}
return d;
}
char *strchr(char *s, int c)
{
while (*s != (char)c) {
if (!*s)
return NULL;
s++;
}
return s;
}
char *strrchr(char *s, int c)
{
char *ret = 0;
do {
if (*s == c)
ret = s;
} while (*s++);
return ret;
}
char *strcat(char *dst, const char *src)
{
strcpy(strchr(dst, '\0'), src);
return dst;
}
char *strncat(char *dst, const char *src, u32 n)
{
strncpy(strchr(dst, '\0'), src, n);
return dst;
}
char *strinv(char *s)
{
u32 s_str = strlen(s);
int iterations = (int)s_str / 2;
for (int i = 0; i < iterations; i++) {
char aux = s[i];
s[i] = s[(s_str - i) - 1];
s[(s_str - i) - 1] = aux;
}
return s;
}
char *strdup(const char *s)
{
int l = strlen(s) + 1;
char *d = malloc(l);
memcpy(d, s, l);
return d;
}
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