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