139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
#include <stdint.h>
|
|
#include "std.h"
|
|
|
|
void *memcpy(void *dest, const void *src, size_t n) {
|
|
// TODO align and copy 32 bits at a time
|
|
uint8_t *d = dest;
|
|
const uint8_t *s = src;
|
|
for (; n > 0; n--) {
|
|
*d++ = *s++;
|
|
}
|
|
return dest;
|
|
}
|
|
|
|
void *memmove(void *dest, const void *src, size_t n) {
|
|
if (src < dest && dest < src + n) {
|
|
// need to copy backwards
|
|
uint8_t *d = dest + n - 1;
|
|
const uint8_t *s = src + n - 1;
|
|
for (; n > 0; n--) {
|
|
*d-- = *s--;
|
|
}
|
|
return dest;
|
|
} else {
|
|
// can use normal memcpy
|
|
return memcpy(dest, src, n);
|
|
}
|
|
}
|
|
|
|
void *memset(void *s, int c, size_t n) {
|
|
uint8_t *s2 = s;
|
|
for (; n > 0; n--) {
|
|
*s2++ = c;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
int strlen(const char *str) {
|
|
int len = 0;
|
|
for (const char *s = str; *s; s++) {
|
|
len += 1;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
int strcmp(const char *s1, const char *s2) {
|
|
while (*s1 && *s2) {
|
|
char c1 = *s1++; // XXX UTF8 get char, next char
|
|
char c2 = *s2++; // XXX UTF8 get char, next char
|
|
if (c1 < c2) return -1;
|
|
else if (c1 > c2) return 1;
|
|
}
|
|
if (*s2) return -1;
|
|
else if (*s1) return 1;
|
|
else return 0;
|
|
}
|
|
|
|
int strncmp(const char *s1, const char *s2, size_t n) {
|
|
while (*s1 && *s2 && n > 0) {
|
|
char c1 = *s1++; // XXX UTF8 get char, next char
|
|
char c2 = *s2++; // XXX UTF8 get char, next char
|
|
n--;
|
|
if (c1 < c2) return -1;
|
|
else if (c1 > c2) return 1;
|
|
}
|
|
if (n == 0) return 0;
|
|
else if (*s2) return -1;
|
|
else if (*s1) return 1;
|
|
else return 0;
|
|
}
|
|
|
|
char *strndup(const char *s, size_t n) {
|
|
size_t len = strlen(s);
|
|
if (n > len) {
|
|
n = len;
|
|
}
|
|
char *s2 = malloc(n + 1);
|
|
memcpy(s2, s, n);
|
|
s2[n] = '\0';
|
|
return s2;
|
|
}
|
|
|
|
char *strcpy(char *dest, const char *src) {
|
|
char *d = dest;
|
|
while (*src) {
|
|
*d++ = *src++;
|
|
}
|
|
*d = '\0';
|
|
return dest;
|
|
}
|
|
|
|
// needed because gcc optimises strcpy + strcat to this
|
|
char *stpcpy(char *dest, const char *src) {
|
|
while (*src) {
|
|
*dest++ = *src++;
|
|
}
|
|
*dest = '\0';
|
|
return dest;
|
|
}
|
|
|
|
char *strcat(char *dest, const char *src) {
|
|
char *d = dest;
|
|
while (*d) {
|
|
d++;
|
|
}
|
|
while (*src) {
|
|
*d++ = *src++;
|
|
}
|
|
*d = '\0';
|
|
return dest;
|
|
}
|
|
|
|
// Public Domain implementation of strchr from:
|
|
// http://en.wikibooks.org/wiki/C_Programming/Strings#The_strchr_function
|
|
char *strchr(const char *s, int c)
|
|
{
|
|
/* Scan s for the character. When this loop is finished,
|
|
s will either point to the end of the string or the
|
|
character we were looking for. */
|
|
while (*s != '\0' && *s != (char)c)
|
|
s++;
|
|
return ((*s == c) ? (char *) s : 0);
|
|
}
|
|
|
|
|
|
// Public Domain implementation of strstr from:
|
|
// http://en.wikibooks.org/wiki/C_Programming/Strings#The_strstr_function
|
|
char *strstr(const char *haystack, const char *needle)
|
|
{
|
|
size_t needlelen;
|
|
/* Check for the null needle case. */
|
|
if (*needle == '\0')
|
|
return (char *) haystack;
|
|
needlelen = strlen(needle);
|
|
for (; (haystack = strchr(haystack, *needle)) != 0; haystack++)
|
|
if (strncmp(haystack, needle, needlelen) == 0)
|
|
return (char *) haystack;
|
|
return 0;
|
|
}
|